From: patrick <patrick@openbsd.org>
Date: Wed, 28 Apr 2021 12:59:51 +0000 (+0000)
Subject: Import libc++ 11.1.0 release.
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=037e796896fd8fe45117f424cd4b8269e58b0673;p=openbsd

Import libc++ 11.1.0 release.
---

diff --git a/gnu/llvm/libcxx/.clang-format b/gnu/llvm/libcxx/.clang-format
new file mode 100644
index 00000000000..dd596813fbb
--- /dev/null
+++ b/gnu/llvm/libcxx/.clang-format
@@ -0,0 +1,13 @@
+BasedOnStyle: LLVM
+
+---
+Language: Cpp
+Standard: Cpp03
+
+AlwaysBreakTemplateDeclarations: true
+PointerAlignment: Left
+
+# Disable formatting options which may break tests.
+SortIncludes: false
+ReflowComments: false
+---
diff --git a/gnu/llvm/libcxx/CMakeLists.txt b/gnu/llvm/libcxx/CMakeLists.txt
index 60564dc96c7..910d04b54b6 100644
--- a/gnu/llvm/libcxx/CMakeLists.txt
+++ b/gnu/llvm/libcxx/CMakeLists.txt
@@ -1,4 +1,9 @@
-# See www/CMake.html for instructions on how to build libcxx with CMake.
+# See https://libcxx.llvm.org/docs/BuildingLibcxx.html for instructions on how
+# to build libcxx with CMake.
+
+if (NOT IS_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/../libcxxabi")
+  message(FATAL_ERROR "libc++ now requires being built in a monorepo layout with libcxxabi available")
+endif()
 
 #===============================================================================
 # Setup Project
@@ -27,7 +32,7 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXX_STANDALONE_BUIL
   project(libcxx CXX C)
 
   set(PACKAGE_NAME libcxx)
-  set(PACKAGE_VERSION 10.0.1)
+  set(PACKAGE_VERSION 11.1.0)
   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
   set(PACKAGE_BUGREPORT "llvm-bugs@lists.llvm.org")
 
@@ -36,11 +41,33 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXX_STANDALONE_BUIL
 endif()
 
 if (LIBCXX_STANDALONE_BUILD)
-  include(FindPythonInterp)
-  if( NOT PYTHONINTERP_FOUND )
-    message(WARNING "Failed to find python interpreter. "
-                    "The libc++ test suite will be disabled.")
-    set(LLVM_INCLUDE_TESTS OFF)
+  if(CMAKE_VERSION VERSION_LESS 3.12)
+    include(FindPythonInterp)
+    if( NOT PYTHONINTERP_FOUND )
+      message(WARNING "Failed to find python interpreter. "
+                      "The libc++ test suite will be disabled.")
+      set(LLVM_INCLUDE_TESTS OFF)
+    else()
+      add_executable(Python3::Interpreter IMPORTED)
+      set_target_properties(Python3::Interpreter PROPERTIES
+        IMPORTED_LOCATION ${PYTHON_EXECUTABLE})
+      set(Python3_EXECUTABLE ${PYTHON_EXECUTABLE})
+    endif()
+  else()
+    find_package(Python3 COMPONENTS Interpreter)
+    if(NOT Python3_Interpreter_FOUND)
+      message(WARNING "Python3 not found, using python2 as a fallback")
+      find_package(Python2 COMPONENTS Interpreter REQUIRED)
+      if(Python2_VERSION VERSION_LESS 2.7)
+        message(SEND_ERROR "Python 2.7 or newer is required")
+      endif()
+
+      # Treat python2 as python3
+      add_executable(Python3::Interpreter IMPORTED)
+      set_target_properties(Python3::Interpreter PROPERTIES
+        IMPORTED_LOCATION ${Python2_EXECUTABLE})
+      set(Python3_EXECUTABLE ${Python2_EXECUTABLE})
+    endif()
   endif()
 endif()
 
@@ -82,6 +109,10 @@ option(LIBCXX_ENABLE_FILESYSTEM "Build filesystem as part of the main libc++ lib
 option(LIBCXX_INCLUDE_TESTS "Build the libc++ tests." ${LLVM_INCLUDE_TESTS})
 option(LIBCXX_ENABLE_PARALLEL_ALGORITHMS "Enable the parallel algorithms library. This requires the PSTL to be available." OFF)
 option(LIBCXX_TEST_GDB_PRETTY_PRINTERS "Test gdb pretty printers." OFF)
+set(LIBCXX_TEST_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/test/lit.site.cfg.in" CACHE STRING
+    "The Lit testing configuration to use when running the tests.")
+set(LIBCXX_TEST_PARAMS "" CACHE STRING
+    "A list of parameters to run the Lit test suite with.")
 
 # Benchmark options -----------------------------------------------------------
 option(LIBCXX_INCLUDE_BENCHMARKS "Build the libc++ benchmarks and their dependencies" ON)
@@ -127,14 +158,13 @@ option(LIBCXX_ABI_FORCE_ITANIUM "Ignore auto-detection and force use of the Itan
 option(LIBCXX_ABI_FORCE_MICROSOFT "Ignore auto-detection and force use of the Microsoft ABI.")
 
 
-set(LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT  "" CACHE STRING
-  "Whether typeinfo names are expected to be unique. Defining this option overrides the default configuration in the library.")
-set(MERGED_TYPEINFO_VALUES ";ON;OFF")
-set_property(CACHE LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT PROPERTY STRINGS ${MERGED_TYPEINFO_DEFAULTS})
-list(FIND MERGED_TYPEINFO_VALUES "${LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT}" IS_VALID_DEFAULT)
+set(LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION "" CACHE STRING "The implementation of typeinfo comparison to use.")
+set(TYPEINFO_COMPARISON_VALUES ";1;2")
+set_property(CACHE LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION PROPERTY STRINGS ${TYPEINFO_COMPARISON_VALUES})
+list(FIND TYPEINFO_COMPARISON_VALUES "${LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION}" IS_VALID_DEFAULT)
 if (${IS_VALID_DEFAULT} EQUAL -1)
-  message(FATAL_ERROR "Value '${LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT}' is not a valid value for
-          LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT")
+  message(FATAL_ERROR "Value '${LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION}' is not a valid value for
+          LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION")
 endif()
 
 option(LIBCXX_HIDE_FROM_ABI_PER_TU_BY_DEFAULT "Enable per TU ABI insulation by default. To be used by vendors." OFF)
@@ -144,45 +174,19 @@ set(LIBCXX_LIBCPPABI_VERSION "2" CACHE STRING "Version of libc++abi's ABI to re-
                                                Note that this is not related to the version of libc++'s ABI itself!")
 
 # ABI Library options ---------------------------------------------------------
-set(LIBCXX_CXX_ABI "default" CACHE STRING
-    "Specify C++ ABI library to use.")
+set(LIBCXX_CXX_ABI "default" CACHE STRING "Specify C++ ABI library to use.")
 set(CXXABIS none default libcxxabi libcxxrt libstdc++ libsupc++ vcruntime)
 set_property(CACHE LIBCXX_CXX_ABI PROPERTY STRINGS ;${CXXABIS})
 
-# FIXME: This is a temporary hack to get the buildbots working while D63883 is in flight.
-# Without this all the bots fail while building libc++
-if (DEFINED ENV{USER})
-  if (("$ENV{USER}" STREQUAL "buildbot") OR (("$ENV{USER}" STREQUAL "llvmbb") OR ("$ENV{USER}" STREQUAL "buildslave")))
-    if (LIBCXX_CXX_ABI STREQUAL "libcxxabi" AND NOT DEFINED LIBCXX_CXX_ABI_INCLUDE_PATHS)
-      message(WARNING "OVERRIDING BUILDBOT CONFIG")
-      set(LIBCXX_CXX_ABI "default" CACHE STRING "FIXME" FORCE)
-    endif()
-  endif()
-endif()
 # Setup the default options if LIBCXX_CXX_ABI is not specified.
 if (LIBCXX_CXX_ABI STREQUAL "default")
-  find_path(
-    LIBCXX_LIBCXXABI_INCLUDES_INTERNAL cxxabi.h
-    PATHS ${LLVM_MAIN_SRC_DIR}/projects/libcxxabi/include
-          ${LLVM_MAIN_SRC_DIR}/runtimes/libcxxabi/include
-          ${LLVM_MAIN_SRC_DIR}/../libcxxabi/include
-    NO_DEFAULT_PATH
-    NO_CMAKE_FIND_ROOT_PATH
-  )
   if (LIBCXX_TARGETING_MSVC)
     # FIXME: Figure out how to configure the ABI library on Windows.
     set(LIBCXX_CXX_ABI_LIBNAME "vcruntime")
-  elseif ((NOT LIBCXX_STANDALONE_BUILD OR HAVE_LIBCXXABI) AND
-          IS_DIRECTORY "${LIBCXX_LIBCXXABI_INCLUDES_INTERNAL}")
-    set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi")
-    set(LIBCXX_CXX_ABI_INCLUDE_PATHS "${LIBCXX_LIBCXXABI_INCLUDES_INTERNAL}")
-    set(LIBCXX_CXX_ABI_INTREE 1)
-  elseif (APPLE)
-    set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi")
-    set(LIBCXX_CXX_ABI_SYSTEM 1)
   elseif (${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
     set(LIBCXX_CXX_ABI_LIBNAME "libcxxrt")
-    set(LIBCXX_CXX_ABI_INCLUDE_PATHS "/usr/include/c++/v1")
+  elseif (NOT LIBCXX_STANDALONE_BUILD OR HAVE_LIBCXXABI)
+    set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi")
   else()
     set(LIBCXX_CXX_ABI_LIBNAME "default")
   endif()
@@ -211,7 +215,7 @@ set(ENABLE_LINKER_SCRIPT_DEFAULT_VALUE OFF)
 if (LLVM_HAVE_LINK_VERSION_SCRIPT AND NOT LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY
       AND NOT LIBCXX_CXX_ABI_LIBNAME STREQUAL "none"
       AND NOT LIBCXX_CXX_ABI_LIBNAME STREQUAL "default"
-      AND PYTHONINTERP_FOUND
+      AND Python3_EXECUTABLE
       AND LIBCXX_ENABLE_SHARED)
     set(ENABLE_LINKER_SCRIPT_DEFAULT_VALUE ON)
 endif()
@@ -228,7 +232,6 @@ option(LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS
 # Build libc++abi with libunwind. We need this option to determine whether to
 # link with libunwind or libgcc_s while running the test cases.
 option(LIBCXXABI_USE_LLVM_UNWINDER "Build and use the LLVM unwinder." OFF)
-option(LIBCXXABI_ENABLE_STATIC_UNWINDER "Statically link the LLVM unwinder." OFF)
 
 # Target options --------------------------------------------------------------
 option(LIBCXX_BUILD_32_BITS "Build 32 bit libc++." ${LLVM_BUILD_32_BITS})
@@ -371,7 +374,7 @@ endif()
 # Warn users that LIBCXX_ENABLE_STATIC_ABI_LIBRARY is an experimental option.
 if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY)
   message(WARNING "LIBCXX_ENABLE_STATIC_ABI_LIBRARY is an experimental option")
-  if (LIBCXX_ENABLE_STATIC AND NOT PYTHONINTERP_FOUND)
+  if (LIBCXX_ENABLE_STATIC AND NOT Python3_EXECUTABLE)
     message(FATAL_ERROR "LIBCXX_ENABLE_STATIC_ABI_LIBRARY requires python but it was not found.")
   endif()
 endif()
@@ -426,6 +429,7 @@ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
   set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
 else()
   set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
+  set(LIBCXX_HEADER_DIR  ${CMAKE_BINARY_DIR})
   set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
 endif()
 
@@ -627,7 +631,6 @@ function(cxx_add_exception_flags target)
     # functions never throw a C++ exception.
     target_add_compile_flags_if_supported(${target} PUBLIC -EHsc)
   else()
-    target_compile_definitions(${target} PUBLIC -D_LIBCPP_NO_EXCEPTIONS)
     target_add_compile_flags_if_supported(${target} PUBLIC -EHs- -EHa-)
     target_add_compile_flags_if_supported(${target} PUBLIC -fno-exceptions)
   endif()
@@ -636,7 +639,6 @@ endfunction()
 # RTTI flags ==================================================================
 function(cxx_add_rtti_flags target)
   if (NOT LIBCXX_ENABLE_RTTI)
-    target_compile_definitions(${target} PUBLIC -D_LIBCPP_NO_RTTI)
     target_add_compile_flags_if_supported(${target} PUBLIC -GR-)
     target_add_compile_flags_if_supported(${target} PUBLIC -fno-rtti)
   endif()
@@ -699,8 +701,13 @@ function(get_sanitizer_flags OUT_VAR  USE_SANITIZER)
       endif()
     elseif (USE_SANITIZER STREQUAL "Undefined")
       append_flags(SANITIZER_FLAGS "-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all")
+    elseif (USE_SANITIZER STREQUAL "Address;Undefined" OR
+            USE_SANITIZER STREQUAL "Undefined;Address")
+      append_flags(SANITIZER_FLAGS "-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all")
     elseif (USE_SANITIZER STREQUAL "Thread")
       append_flags(SANITIZER_FLAGS -fsanitize=thread)
+    elseif (USE_SANITIZER STREQUAL "DataFlow")
+      append_flags(SANITIZER_FLAGS -fsanitize=dataflow)
     else()
       message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${USE_SANITIZER}")
     endif()
@@ -752,11 +759,13 @@ function(cxx_link_system_libraries target)
     if (LIBCXX_BUILTINS_LIBRARY)
       target_link_libraries(${target} PRIVATE "${LIBCXX_BUILTINS_LIBRARY}")
     endif()
+  elseif (LIBCXX_HAS_GCC_LIB)
+    target_link_libraries(${target} PRIVATE gcc)
   elseif (LIBCXX_HAS_GCC_S_LIB)
     target_link_libraries(${target} PRIVATE gcc_s)
   endif()
 
-  if (LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB)
+  if (LIBCXX_HAS_ATOMIC_LIB)
     target_link_libraries(${target} PRIVATE atomic)
   endif()
 
@@ -779,6 +788,10 @@ function(cxx_link_system_libraries target)
     # (e.g. `printfw`/`scanfw`)
     target_link_libraries(${target} PRIVATE iso_stdio_wide_specifiers)
   endif()
+
+  if (ANDROID AND ANDROID_PLATFORM_LEVEL LESS 21)
+    target_link_libraries(${target} PUBLIC android_support)
+  endif()
 endfunction()
 
 # Windows-related flags =======================================================
@@ -829,8 +842,8 @@ config_define_if_not(LIBCXX_ENABLE_STDOUT _LIBCPP_HAS_NO_STDOUT)
 config_define_if_not(LIBCXX_ENABLE_THREADS _LIBCPP_HAS_NO_THREADS)
 config_define_if_not(LIBCXX_ENABLE_MONOTONIC_CLOCK _LIBCPP_HAS_NO_MONOTONIC_CLOCK)
 config_define_if_not(LIBCXX_ENABLE_THREAD_UNSAFE_C_FUNCTIONS _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS)
-if (NOT LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT STREQUAL "")
-  config_define("${LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT}" _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT)
+if (NOT LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION STREQUAL "")
+  config_define("${LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION}" _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION)
 endif()
 
 config_define_if(LIBCXX_HAS_PTHREAD_API _LIBCPP_HAS_THREAD_API_PTHREAD)
@@ -861,32 +874,11 @@ if (DEFINED WIN32 AND LIBCXX_ENABLE_STATIC AND NOT LIBCXX_ENABLE_SHARED)
   config_define(ON _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
 endif()
 
-set(site_config_path "${LIBCXX_BINARY_DIR}/__config_site")
-if (LIBCXX_NEEDS_SITE_CONFIG)
-  configure_file("include/__config_site.in"
-                 "${site_config_path}"
-                 @ONLY)
-elseif(EXISTS "${site_config_path}")
-  message(STATUS "Removing stale site configuration ${site_config_path}")
-  file(REMOVE "${site_config_path}")
-endif()
-
-function(cxx_add_config_site target)
-  if (LIBCXX_NEEDS_SITE_CONFIG)
-    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR "${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC")
-      target_compile_options(${target} PUBLIC "/FI\"${site_config_path}\"")
-    else()
-      target_compile_options(${target} PUBLIC -include "${site_config_path}")
-    endif()
-  endif()
-endfunction()
-
 # Setup all common build flags =================================================
 function(cxx_add_common_build_flags target)
   cxx_add_basic_build_flags(${target})
   cxx_add_warning_flags(${target})
   cxx_add_windows_flags(${target})
-  cxx_add_config_site(${target})
   cxx_add_exception_flags(${target})
   cxx_add_rtti_flags(${target})
   cxx_add_module_flags(${target})
@@ -896,7 +888,6 @@ endfunction()
 #===============================================================================
 # Setup Source Code And Tests
 #===============================================================================
-include_directories(include)
 add_subdirectory(include)
 add_subdirectory(src)
 
@@ -914,28 +905,18 @@ if (LIBCXX_INCLUDE_BENCHMARKS)
   add_subdirectory(benchmarks)
 endif()
 
-# Create the lit.site.cfg file even when LIBCXX_INCLUDE_TESTS is OFF or
-# LLVM_FOUND is OFF. This allows users to run the tests manually using
-# LIT without requiring a full LLVM checkout.
-#
-# However, since some submission systems strip test/ subdirectories, check for
-# it before adding it.
-
-if(IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/test")
-  add_subdirectory(test)
-endif()
 if (LIBCXX_INCLUDE_TESTS)
+  add_subdirectory(test)
   add_subdirectory(lib/abi)
-endif()
-
-if (LIBCXX_STANDALONE_BUILD AND EXISTS "${LLVM_MAIN_SRC_DIR}/utils/llvm-lit")
-  include(AddLLVM) # for get_llvm_lit_path
-  # Make sure the llvm-lit script is generated into the bin directory, and do
-  # it after adding all tests, since the generated script will only work
-  # correctly discovered tests against test locations from the source tree that
-  # have already been discovered.
-  add_subdirectory(${LLVM_MAIN_SRC_DIR}/utils/llvm-lit
-                   ${CMAKE_CURRENT_BINARY_DIR}/llvm-lit)
+  if (LIBCXX_STANDALONE_BUILD)
+    include(AddLLVM) # for get_llvm_lit_path
+    # Make sure the llvm-lit script is generated into the bin directory, and
+    # do it after adding all tests, since the generated script will only work
+    # correctly discovered tests against test locations from the source tree
+    # that have already been discovered.
+    add_subdirectory(${LLVM_MAIN_SRC_DIR}/utils/llvm-lit
+                     ${CMAKE_CURRENT_BINARY_DIR}/llvm-lit)
+  endif()
 endif()
 
 if (LIBCXX_INCLUDE_DOCS)
diff --git a/gnu/llvm/libcxx/CREDITS.TXT b/gnu/llvm/libcxx/CREDITS.TXT
index f97b9d82277..49f095d2964 100644
--- a/gnu/llvm/libcxx/CREDITS.TXT
+++ b/gnu/llvm/libcxx/CREDITS.TXT
@@ -41,6 +41,11 @@ N: Jonathan B Coe
 E: jbcoe@me.com
 D: Implementation of propagate_const.
 
+N: Christopher Di Bella
+E: cjdb@google.com
+E: cjdb.ns@gmail.com
+D: Library concepts.
+
 N: Glen Joseph Fernandes
 E: glenjofe@gmail.com
 D: Implementation of to_address.
diff --git a/gnu/llvm/libcxx/TODO.TXT b/gnu/llvm/libcxx/TODO.TXT
index 652a38de75a..cf489d29149 100644
--- a/gnu/llvm/libcxx/TODO.TXT
+++ b/gnu/llvm/libcxx/TODO.TXT
@@ -2,7 +2,6 @@ This is meant to be a general place to list things that should be done "someday"
 
 CXX Runtime Library Tasks
 =========================
-* Fix that CMake always link to /usr/lib/libc++abi.dylib on OS X.
 * Look into mirroring libsupc++'s typeinfo vtable layout when libsupc++/libstdc++
   is used as the runtime library.
 * Investigate and document interoperability between libc++ and libstdc++ on
diff --git a/gnu/llvm/libcxx/benchmarks/CMakeLists.txt b/gnu/llvm/libcxx/benchmarks/CMakeLists.txt
index bd38de97d7a..8480ede23a4 100644
--- a/gnu/llvm/libcxx/benchmarks/CMakeLists.txt
+++ b/gnu/llvm/libcxx/benchmarks/CMakeLists.txt
@@ -18,9 +18,7 @@ if (DEFINED LIBCXX_CXX_ABI_LIBRARY_PATH)
           -L${LIBCXX_CXX_ABI_LIBRARY_PATH}
           -Wl,-rpath,${LIBCXX_CXX_ABI_LIBRARY_PATH})
 endif()
-if (LIBCXX_NEEDS_SITE_CONFIG)
-  list(APPEND BENCHMARK_LIBCXX_COMPILE_FLAGS -include "${LIBCXX_BINARY_DIR}/__config_site")
-endif()
+list(APPEND BENCHMARK_LIBCXX_COMPILE_FLAGS -include "${LIBCXX_BINARY_DIR}/__config_site")
 split_list(BENCHMARK_LIBCXX_COMPILE_FLAGS)
 
 ExternalProject_Add(google-benchmark-libcxx
@@ -89,8 +87,6 @@ set(BENCHMARK_TEST_COMPILE_FLAGS
     -I${LIBCXX_SOURCE_DIR}/test/support
 )
 set(BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS
-    -nostdinc++
-    -isystem ${LIBCXX_SOURCE_DIR}/include
     ${BENCHMARK_TEST_COMPILE_FLAGS}
     ${SANITIZER_FLAGS}
     -Wno-user-defined-literals
@@ -132,7 +128,7 @@ function(add_benchmark_test name source_file)
   set(libcxx_target ${name}_libcxx)
   list(APPEND libcxx_benchmark_targets ${libcxx_target})
   add_executable(${libcxx_target} EXCLUDE_FROM_ALL ${source_file})
-  add_dependencies(${libcxx_target} cxx cxx-headers google-benchmark-libcxx)
+  add_dependencies(${libcxx_target} cxx google-benchmark-libcxx)
   add_dependencies(cxx-benchmarks ${libcxx_target})
   if (LIBCXX_ENABLE_SHARED)
     target_link_libraries(${libcxx_target} PRIVATE cxx_shared)
diff --git a/gnu/llvm/libcxx/benchmarks/algorithms.bench.cpp b/gnu/llvm/libcxx/benchmarks/algorithms.bench.cpp
index b259d476457..93383e2b9cd 100644
--- a/gnu/llvm/libcxx/benchmarks/algorithms.bench.cpp
+++ b/gnu/llvm/libcxx/benchmarks/algorithms.bench.cpp
@@ -14,14 +14,23 @@
 
 namespace {
 
-enum class ValueType { Uint32, String };
-struct AllValueTypes : EnumValuesAsTuple<AllValueTypes, ValueType, 2> {
-  static constexpr const char* Names[] = {"uint32", "string"};
+enum class ValueType { Uint32, Uint64, Pair, Tuple, String };
+struct AllValueTypes : EnumValuesAsTuple<AllValueTypes, ValueType, 5> {
+  static constexpr const char* Names[] = {
+      "uint32", "uint64", "pair<uint32, uint32>",
+      "tuple<uint32, uint64, uint32>", "string"};
 };
 
 template <class V>
-using Value =
-    std::conditional_t<V() == ValueType::Uint32, uint32_t, std::string>;
+using Value = std::conditional_t<
+    V() == ValueType::Uint32, uint32_t,
+    std::conditional_t<
+        V() == ValueType::Uint64, uint64_t,
+        std::conditional_t<
+            V() == ValueType::Pair, std::pair<uint32_t, uint32_t>,
+            std::conditional_t<V() == ValueType::Tuple,
+                               std::tuple<uint32_t, uint64_t, uint32_t>,
+                               std::string> > > >;
 
 enum class Order {
   Random,
@@ -37,7 +46,8 @@ struct AllOrders : EnumValuesAsTuple<AllOrders, Order, 6> {
                                           "PipeOrgan",  "Heap"};
 };
 
-void fillValues(std::vector<uint32_t>& V, size_t N, Order O) {
+template <typename T>
+void fillValues(std::vector<T>& V, size_t N, Order O) {
   if (O == Order::SingleElement) {
     V.resize(N, 0);
   } else {
@@ -46,13 +56,49 @@ void fillValues(std::vector<uint32_t>& V, size_t N, Order O) {
   }
 }
 
-void fillValues(std::vector<std::string>& V, size_t N, Order O) {
+template <typename T>
+void fillValues(std::vector<std::pair<T, T> >& V, size_t N, Order O) {
+  if (O == Order::SingleElement) {
+    V.resize(N, std::make_pair(0, 0));
+  } else {
+    while (V.size() < N)
+      // Half of array will have the same first element.
+      if (V.size() % 2) {
+        V.push_back(std::make_pair(V.size(), V.size()));
+      } else {
+        V.push_back(std::make_pair(0, V.size()));
+      }
+  }
+}
 
+template <typename T1, typename T2, typename T3>
+void fillValues(std::vector<std::tuple<T1, T2, T3> >& V, size_t N, Order O) {
+  if (O == Order::SingleElement) {
+    V.resize(N, std::make_tuple(0, 0, 0));
+  } else {
+    while (V.size() < N)
+      // One third of array will have the same first element.
+      // One third of array will have the same first element and the same second element.
+      switch (V.size() % 3) {
+      case 0:
+        V.push_back(std::make_tuple(V.size(), V.size(), V.size()));
+        break;
+      case 1:
+        V.push_back(std::make_tuple(0, V.size(), V.size()));
+        break;
+      case 2:
+        V.push_back(std::make_tuple(0, 0, V.size()));
+        break;
+      }
+  }
+}
+
+void fillValues(std::vector<std::string>& V, size_t N, Order O) {
   if (O == Order::SingleElement) {
-    V.resize(N, getRandomString(1024));
+    V.resize(N, getRandomString(64));
   } else {
     while (V.size() < N)
-      V.push_back(getRandomString(1024));
+      V.push_back(getRandomString(64));
   }
 }
 
@@ -85,21 +131,24 @@ void sortValues(T& V, Order O) {
   }
 }
 
+constexpr size_t TestSetElements =
+#if !TEST_HAS_FEATURE(memory_sanitizer)
+    1 << 18;
+#else
+    1 << 14;
+#endif
+
 template <class ValueType>
 std::vector<std::vector<Value<ValueType> > > makeOrderedValues(size_t N,
                                                                Order O) {
-  // Let's make sure that all random sequences of the same size are the same.
-  // That way we can compare the different algorithms with the same input.
-  static std::map<std::pair<size_t, Order>, std::vector<Value<ValueType> > >
-      Cached;
-
-  auto& Values = Cached[{N, O}];
-  if (Values.empty()) {
-    fillValues(Values, N, O);
-    sortValues(Values, O);
-  };
-  const size_t NumCopies = std::max(size_t{1}, 1000 / N);
-  return { NumCopies, Values };
+  std::vector<std::vector<Value<ValueType> > > Ret;
+  const size_t NumCopies = std::max(size_t{1}, TestSetElements / N);
+  Ret.resize(NumCopies);
+  for (auto& V : Ret) {
+    fillValues(V, N, O);
+    sortValues(V, O);
+  }
+  return Ret;
 }
 
 template <class T, class U>
@@ -111,19 +160,28 @@ TEST_ALWAYS_INLINE void resetCopies(benchmark::State& state, T& Copies,
   state.ResumeTiming();
 }
 
+enum class BatchSize {
+  CountElements,
+  CountBatch,
+};
+
 template <class ValueType, class F>
 void runOpOnCopies(benchmark::State& state, size_t Quantity, Order O,
-                   bool CountElements, F f) {
+                   BatchSize Count, F Body) {
   auto Copies = makeOrderedValues<ValueType>(Quantity, O);
-  const auto Orig = Copies[0];
+  auto Orig = Copies;
 
-  const size_t Batch = CountElements ? Copies.size() * Quantity : Copies.size();
+  const size_t Batch = Count == BatchSize::CountElements
+                           ? Copies.size() * Quantity
+                           : Copies.size();
   while (state.KeepRunningBatch(Batch)) {
     for (auto& Copy : Copies) {
-      f(Copy);
+      Body(Copy);
       benchmark::DoNotOptimize(Copy);
     }
-    resetCopies(state, Copies, Orig);
+    state.PauseTiming();
+    Copies = Orig;
+    state.ResumeTiming();
   }
 }
 
@@ -132,9 +190,9 @@ struct Sort {
   size_t Quantity;
 
   void run(benchmark::State& state) const {
-    runOpOnCopies<ValueType>(state, Quantity, Order(), false, [](auto& Copy) {
-      std::sort(Copy.begin(), Copy.end());
-    });
+    runOpOnCopies<ValueType>(
+        state, Quantity, Order(), BatchSize::CountElements,
+        [](auto& Copy) { std::sort(Copy.begin(), Copy.end()); });
   }
 
   bool skip() const { return Order() == ::Order::Heap; }
@@ -150,9 +208,9 @@ struct StableSort {
   size_t Quantity;
 
   void run(benchmark::State& state) const {
-    runOpOnCopies<ValueType>(state, Quantity, Order(), false, [](auto& Copy) {
-      std::stable_sort(Copy.begin(), Copy.end());
-    });
+    runOpOnCopies<ValueType>(
+        state, Quantity, Order(), BatchSize::CountElements,
+        [](auto& Copy) { std::stable_sort(Copy.begin(), Copy.end()); });
   }
 
   bool skip() const { return Order() == ::Order::Heap; }
@@ -168,9 +226,9 @@ struct MakeHeap {
   size_t Quantity;
 
   void run(benchmark::State& state) const {
-    runOpOnCopies<ValueType>(state, Quantity, Order(), false, [](auto& Copy) {
-      std::make_heap(Copy.begin(), Copy.end());
-    });
+    runOpOnCopies<ValueType>(
+        state, Quantity, Order(), BatchSize::CountElements,
+        [](auto& Copy) { std::make_heap(Copy.begin(), Copy.end()); });
   }
 
   std::string name() const {
@@ -185,7 +243,7 @@ struct SortHeap {
 
   void run(benchmark::State& state) const {
     runOpOnCopies<ValueType>(
-        state, Quantity, Order::Heap, false,
+        state, Quantity, Order::Heap, BatchSize::CountElements,
         [](auto& Copy) { std::sort_heap(Copy.begin(), Copy.end()); });
   }
 
@@ -199,10 +257,11 @@ struct MakeThenSortHeap {
   size_t Quantity;
 
   void run(benchmark::State& state) const {
-    runOpOnCopies<ValueType>(state, Quantity, Order(), false, [](auto& Copy) {
-      std::make_heap(Copy.begin(), Copy.end());
-      std::sort_heap(Copy.begin(), Copy.end());
-    });
+    runOpOnCopies<ValueType>(state, Quantity, Order(), BatchSize::CountElements,
+                             [](auto& Copy) {
+                               std::make_heap(Copy.begin(), Copy.end());
+                               std::sort_heap(Copy.begin(), Copy.end());
+                             });
   }
 
   std::string name() const {
@@ -216,11 +275,12 @@ struct PushHeap {
   size_t Quantity;
 
   void run(benchmark::State& state) const {
-    runOpOnCopies<ValueType>(state, Quantity, Order(), true, [](auto& Copy) {
-      for (auto I = Copy.begin(), E = Copy.end(); I != E; ++I) {
-        std::push_heap(Copy.begin(), I + 1);
-      }
-    });
+    runOpOnCopies<ValueType>(
+        state, Quantity, Order(), BatchSize::CountElements, [](auto& Copy) {
+          for (auto I = Copy.begin(), E = Copy.end(); I != E; ++I) {
+            std::push_heap(Copy.begin(), I + 1);
+          }
+        });
   }
 
   bool skip() const { return Order() == ::Order::Heap; }
@@ -236,11 +296,12 @@ struct PopHeap {
   size_t Quantity;
 
   void run(benchmark::State& state) const {
-    runOpOnCopies<ValueType>(state, Quantity, Order(), true, [](auto& Copy) {
-      for (auto B = Copy.begin(), I = Copy.end(); I != B; --I) {
-        std::pop_heap(B, I);
-      }
-    });
+    runOpOnCopies<ValueType>(
+        state, Quantity, Order(), BatchSize::CountElements, [](auto& Copy) {
+          for (auto B = Copy.begin(), I = Copy.end(); I != B; --I) {
+            std::pop_heap(B, I);
+          }
+        });
   }
 
   std::string name() const {
@@ -273,4 +334,4 @@ int main(int argc, char** argv) {
   makeCartesianProductBenchmark<PushHeap, AllValueTypes, AllOrders>(Quantities);
   makeCartesianProductBenchmark<PopHeap, AllValueTypes>(Quantities);
   benchmark::RunSpecifiedBenchmarks();
-}
+}
\ No newline at end of file
diff --git a/gnu/llvm/libcxx/benchmarks/string.bench.cpp b/gnu/llvm/libcxx/benchmarks/string.bench.cpp
index fe8a1c533d9..e43ad3212ff 100644
--- a/gnu/llvm/libcxx/benchmarks/string.bench.cpp
+++ b/gnu/llvm/libcxx/benchmarks/string.bench.cpp
@@ -308,6 +308,58 @@ struct StringAssignAsciiz {
   }
 };
 
+template <class Length, class Opaque>
+struct StringEraseToEnd {
+  static void run(benchmark::State& state) {
+    constexpr bool opaque = Opaque{} == Opacity::Opaque;
+    constexpr int kNumStrings = 4 << 10;
+    std::string strings[kNumStrings];
+    const int mid = makeString(Length()).size() / 2;
+    while (state.KeepRunningBatch(kNumStrings)) {
+      state.PauseTiming();
+      for (int i = 0; i < kNumStrings; ++i) {
+        strings[i] = makeString(Length());
+      }
+      benchmark::DoNotOptimize(strings);
+      state.ResumeTiming();
+      for (int i = 0; i < kNumStrings; ++i) {
+        strings[i].erase(maybeOpaque(mid, opaque),
+                         maybeOpaque(std::string::npos, opaque));
+      }
+    }
+  }
+
+  static std::string name() {
+    return "BM_StringEraseToEnd" + Length::name() + Opaque::name();
+  }
+};
+
+template <class Length, class Opaque>
+struct StringEraseWithMove {
+  static void run(benchmark::State& state) {
+    constexpr bool opaque = Opaque{} == Opacity::Opaque;
+    constexpr int kNumStrings = 4 << 10;
+    std::string strings[kNumStrings];
+    const int n = makeString(Length()).size() / 2;
+    const int pos = n / 2;
+    while (state.KeepRunningBatch(kNumStrings)) {
+      state.PauseTiming();
+      for (int i = 0; i < kNumStrings; ++i) {
+        strings[i] = makeString(Length());
+      }
+      benchmark::DoNotOptimize(strings);
+      state.ResumeTiming();
+      for (int i = 0; i < kNumStrings; ++i) {
+        strings[i].erase(maybeOpaque(pos, opaque), maybeOpaque(n, opaque));
+      }
+    }
+  }
+
+  static std::string name() {
+    return "BM_StringEraseWithMove" + Length::name() + Opaque::name();
+  }
+};
+
 template <class Opaque>
 struct StringAssignAsciizMix {
   static void run(benchmark::State& state) {
@@ -556,6 +608,8 @@ int main(int argc, char** argv) {
   makeCartesianProductBenchmark<StringDestroy, AllLengths>();
   makeCartesianProductBenchmark<StringResizeDefaultInit, AllLengths,
                                 AllOpacity>();
+  makeCartesianProductBenchmark<StringEraseToEnd, AllLengths, AllOpacity>();
+  makeCartesianProductBenchmark<StringEraseWithMove, AllLengths, AllOpacity>();
   makeCartesianProductBenchmark<StringRelational, AllRelations, AllLengths,
                                 AllLengths, AllDiffTypes>();
   makeCartesianProductBenchmark<StringRelationalLiteral, AllRelations,
diff --git a/gnu/llvm/libcxx/cmake/Modules/DefineLinkerScript.cmake b/gnu/llvm/libcxx/cmake/Modules/DefineLinkerScript.cmake
index 2e68121f618..11a6ca57dfc 100644
--- a/gnu/llvm/libcxx/cmake/Modules/DefineLinkerScript.cmake
+++ b/gnu/llvm/libcxx/cmake/Modules/DefineLinkerScript.cmake
@@ -31,6 +31,9 @@ function(define_linker_script target)
   set(link_libraries)
   if (interface_libs)
     foreach(lib IN LISTS interface_libs)
+      if ("${lib}" STREQUAL "cxx-headers")
+        continue()
+      endif()
       if (TARGET "${lib}" OR
           (${lib} MATCHES "cxxabi(_static|_shared)?" AND HAVE_LIBCXXABI) OR
           (${lib} MATCHES "unwind(_static|_shared)?" AND HAVE_LIBUNWIND))
diff --git a/gnu/llvm/libcxx/cmake/Modules/HandleLibCXXABI.cmake b/gnu/llvm/libcxx/cmake/Modules/HandleLibCXXABI.cmake
index 10f100f7f0f..c5aa26739e3 100644
--- a/gnu/llvm/libcxx/cmake/Modules/HandleLibCXXABI.cmake
+++ b/gnu/llvm/libcxx/cmake/Modules/HandleLibCXXABI.cmake
@@ -37,8 +37,10 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
   foreach(fpath ${LIBCXX_ABILIB_FILES})
     set(found FALSE)
     foreach(incpath ${LIBCXX_CXX_ABI_INCLUDE_PATHS})
+      message(STATUS "Looking for ${fpath} in ${incpath}")
       if (EXISTS "${incpath}/${fpath}")
         set(found TRUE)
+        message(STATUS "Looking for ${fpath} in ${incpath} - found")
         get_filename_component(dstdir ${fpath} PATH)
         get_filename_component(ifile ${fpath} NAME)
         set(src ${incpath}/${fpath})
@@ -50,7 +52,7 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
             COMMENT "Copying C++ ABI header ${fpath}...")
         list(APPEND abilib_headers "${dst}")
 
-        if (NOT LIBCXX_USING_INSTALLED_LLVM AND LIBCXX_HEADER_DIR)
+        if (LIBCXX_HEADER_DIR)
           set(dst "${LIBCXX_HEADER_DIR}/include/c++/v1/${dstdir}/${fpath}")
           add_custom_command(OUTPUT ${dst}
               DEPENDS ${src}
@@ -66,10 +68,12 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
             )
         endif()
+      else()
+        message(STATUS "Looking for ${fpath} in ${incpath} - not found")
       endif()
     endforeach()
     if (NOT found)
-      message(WARNING "Failed to find ${fpath}")
+      message(WARNING "Failed to find ${fpath} in ${LIBCXX_CXX_ABI_INCLUDE_PATHS}")
     endif()
   endforeach()
 
@@ -98,34 +102,35 @@ if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++" OR
     "${_LIBSUPCXX_LIBNAME}" "${_LIBSUPCXX_LIBNAME}" "${_LIBSUPCXX_INCLUDE_FILES}" "bits"
     )
 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxabi")
-  if (LIBCXX_CXX_ABI_INTREE)
-    # Link against just-built "cxxabi" target.
-    set(CXXABI_SHARED_LIBNAME cxxabi_shared)
-    set(CXXABI_STATIC_LIBNAME cxxabi_static)
-  else()
-    # Assume c++abi is installed in the system, rely on -lc++abi link flag.
-    set(CXXABI_SHARED_LIBNAME "c++abi")
-    set(CXXABI_STATIC_LIBNAME "c++abi")
+  if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS)
+    set(LIBCXX_CXX_ABI_INCLUDE_PATHS "${LIBCXX_SOURCE_DIR}/../libcxxabi/include")
   endif()
-  if (LIBCXX_CXX_ABI_SYSTEM)
-    set(HEADERS "")
+
+  if(LIBCXX_STANDALONE_BUILD AND NOT (LIBCXX_CXX_ABI_INTREE OR HAVE_LIBCXXABI))
+    set(shared c++abi)
+    set(static c++abi)
   else()
-    set(HEADERS "cxxabi.h;__cxxabi_config.h")
+    set(shared cxxabi_shared)
+    set(static cxxabi_static)
   endif()
+
   setup_abi_lib(
     "-DLIBCXX_BUILDING_LIBCXXABI"
-    "${CXXABI_SHARED_LIBNAME}" "${CXXABI_STATIC_LIBNAME}" "${HEADERS}" "")
+    "${shared}" "${static}" "cxxabi.h;__cxxabi_config.h" "")
 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxrt")
+  if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS)
+    set(LIBCXX_CXX_ABI_INCLUDE_PATHS "/usr/include/c++/v1")
+  endif()
   setup_abi_lib(
     "-DLIBCXXRT"
     "cxxrt" "cxxrt" "cxxabi.h;unwind.h;unwind-arm.h;unwind-itanium.h" ""
     )
 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "vcruntime")
- # Nothing TODO
+ # Nothing to do
 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "none")
   list(APPEND LIBCXX_COMPILE_FLAGS "-D_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY")
 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "default")
-  # Nothing TODO
+  # Nothing to do
 else()
   message(FATAL_ERROR
     "Unsupported c++ abi: '${LIBCXX_CXX_ABI_LIBNAME}'. \
diff --git a/gnu/llvm/libcxx/cmake/Modules/HandleLibcxxFlags.cmake b/gnu/llvm/libcxx/cmake/Modules/HandleLibcxxFlags.cmake
index b0fb98b9866..a5b4df6600e 100644
--- a/gnu/llvm/libcxx/cmake/Modules/HandleLibcxxFlags.cmake
+++ b/gnu/llvm/libcxx/cmake/Modules/HandleLibcxxFlags.cmake
@@ -88,20 +88,17 @@ endmacro()
 macro(config_define_if condition def)
   if (${condition})
     set(${def} ON)
-    set(LIBCXX_NEEDS_SITE_CONFIG ON)
   endif()
 endmacro()
 
 macro(config_define_if_not condition def)
   if (NOT ${condition})
     set(${def} ON)
-    set(LIBCXX_NEEDS_SITE_CONFIG ON)
   endif()
 endmacro()
 
 macro(config_define value def)
   set(${def} ${value})
-  set(LIBCXX_NEEDS_SITE_CONFIG ON)
 endmacro()
 
 # Add a list of flags to all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS',
diff --git a/gnu/llvm/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake b/gnu/llvm/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake
index 5746afb5eb3..457ad417604 100644
--- a/gnu/llvm/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake
+++ b/gnu/llvm/libcxx/cmake/Modules/HandleOutOfTreeLLVM.cmake
@@ -1,142 +1,78 @@
-macro(find_llvm_parts)
-# Rely on llvm-config.
-  set(CONFIG_OUTPUT)
-  if(NOT LLVM_CONFIG_PATH)
-    find_program(LLVM_CONFIG_PATH "llvm-config")
-  endif()
-  if(DEFINED LLVM_PATH)
-    set(LLVM_INCLUDE_DIR ${LLVM_INCLUDE_DIR} CACHE PATH "Path to llvm/include")
-    set(LLVM_PATH ${LLVM_PATH} CACHE PATH "Path to LLVM source tree")
-    set(LLVM_MAIN_SRC_DIR ${LLVM_PATH})
-    set(LLVM_CMAKE_PATH "${LLVM_PATH}/cmake/modules")
-    if (NOT IS_DIRECTORY "${LLVM_PATH}")
-      message(FATAL_ERROR "The provided LLVM_PATH (${LLVM_PATH}) is not a valid directory")
-    endif()
-  elseif(LLVM_CONFIG_PATH)
-    message(STATUS "Found LLVM_CONFIG_PATH as ${LLVM_CONFIG_PATH}")
-    set(LIBCXX_USING_INSTALLED_LLVM 1)
-    set(CONFIG_COMMAND ${LLVM_CONFIG_PATH}
-      "--includedir"
-      "--prefix"
-      "--src-root")
-    execute_process(
-      COMMAND ${CONFIG_COMMAND}
-      RESULT_VARIABLE HAD_ERROR
-      OUTPUT_VARIABLE CONFIG_OUTPUT
-    )
-    if(NOT HAD_ERROR)
-      string(REGEX REPLACE
-        "[ \t]*[\r\n]+[ \t]*" ";"
-        CONFIG_OUTPUT ${CONFIG_OUTPUT})
-    else()
-      string(REPLACE ";" " " CONFIG_COMMAND_STR "${CONFIG_COMMAND}")
-      message(STATUS "${CONFIG_COMMAND_STR}")
-      message(FATAL_ERROR "llvm-config failed with status ${HAD_ERROR}")
-    endif()
+if (NOT DEFINED LLVM_PATH)
+  set(LLVM_PATH ${CMAKE_CURRENT_LIST_DIR}/../../../llvm CACHE PATH "" FORCE)
+endif()
 
-    list(GET CONFIG_OUTPUT 0 INCLUDE_DIR)
-    list(GET CONFIG_OUTPUT 1 LLVM_OBJ_ROOT)
-    list(GET CONFIG_OUTPUT 2 MAIN_SRC_DIR)
+if(NOT IS_DIRECTORY ${LLVM_PATH})
+  message(FATAL_ERROR
+    "The provided LLVM_PATH (${LLVM_PATH}) is not a valid directory. Note that "
+    "building libc++ outside of the monorepo is not supported anymore. Please "
+    "use a Standalone build against the monorepo, a Runtimes build or a classic "
+    "monorepo build.")
+endif()
 
-    set(LLVM_INCLUDE_DIR ${INCLUDE_DIR} CACHE PATH "Path to llvm/include")
-    set(LLVM_BINARY_DIR ${LLVM_OBJ_ROOT} CACHE PATH "Path to LLVM build tree")
-    set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
+set(LLVM_INCLUDE_DIR ${LLVM_PATH}/include CACHE PATH "Path to llvm/include")
+set(LLVM_PATH ${LLVM_PATH} CACHE PATH "Path to LLVM source tree")
+set(LLVM_MAIN_SRC_DIR ${LLVM_PATH})
+set(LLVM_CMAKE_PATH "${LLVM_PATH}/cmake/modules")
 
-    # --cmakedir is supported since llvm r291218 (4.0 release)
-    execute_process(
-      COMMAND ${LLVM_CONFIG_PATH} --cmakedir
-      RESULT_VARIABLE HAD_ERROR
-      OUTPUT_VARIABLE CONFIG_OUTPUT
-      ERROR_QUIET)
-    if(NOT HAD_ERROR)
-      string(STRIP "${CONFIG_OUTPUT}" LLVM_CMAKE_PATH_FROM_LLVM_CONFIG)
-      file(TO_CMAKE_PATH "${LLVM_CMAKE_PATH_FROM_LLVM_CONFIG}" LLVM_CMAKE_PATH)
-    else()
-      file(TO_CMAKE_PATH "${LLVM_BINARY_DIR}" LLVM_BINARY_DIR_CMAKE_STYLE)
-      set(LLVM_CMAKE_PATH "${LLVM_BINARY_DIR_CMAKE_STYLE}/lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm")
-    endif()
-  else()
-    set(LLVM_FOUND OFF)
-    message(WARNING "UNSUPPORTED LIBCXX CONFIGURATION DETECTED: "
-                    "llvm-config not found and LLVM_PATH not defined.\n"
-                    "Reconfigure with -DLLVM_CONFIG_PATH=path/to/llvm-config "
-                    "or -DLLVM_PATH=path/to/llvm-source-root.")
-    return()
-  endif()
+if (EXISTS "${LLVM_CMAKE_PATH}")
+  list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_PATH}")
+elseif (EXISTS "${LLVM_MAIN_SRC_DIR}/cmake/modules")
+  list(APPEND CMAKE_MODULE_PATH "${LLVM_MAIN_SRC_DIR}/cmake/modules")
+else()
+  message(FATAL_ERROR "Neither ${LLVM_CMAKE_PATH} nor ${LLVM_MAIN_SRC_DIR}/cmake/modules found. "
+                      "This is not a supported configuration.")
+endif()
 
-  if (EXISTS "${LLVM_CMAKE_PATH}")
-    list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_PATH}")
-  elseif (EXISTS "${LLVM_MAIN_SRC_DIR}/cmake/modules")
-    list(APPEND CMAKE_MODULE_PATH "${LLVM_MAIN_SRC_DIR}/cmake/modules")
-  else()
-    set(LLVM_FOUND OFF)
-    message(WARNING "Neither ${LLVM_CMAKE_PATH} nor ${LLVM_MAIN_SRC_DIR}/cmake/modules found")
-    return()
-  endif()
+message(STATUS "Configuring for standalone build.")
+set(LIBCXX_STANDALONE_BUILD 1)
 
-  set(LLVM_FOUND ON)
-endmacro(find_llvm_parts)
+# Add LLVM Functions --------------------------------------------------------
+if (WIN32)
+  set(LLVM_ON_UNIX 0)
+  set(LLVM_ON_WIN32 1)
+else()
+  set(LLVM_ON_UNIX 1)
+  set(LLVM_ON_WIN32 0)
+endif()
 
-macro(configure_out_of_tree_llvm)
-  message(STATUS "Configuring for standalone build.")
-  set(LIBCXX_STANDALONE_BUILD 1)
+include(AddLLVM OPTIONAL)
 
-  find_llvm_parts()
+# LLVM Options --------------------------------------------------------------
+if (NOT DEFINED LLVM_INCLUDE_TESTS)
+  set(LLVM_INCLUDE_TESTS ON)
+endif()
+if (NOT DEFINED LLVM_INCLUDE_DOCS)
+  set(LLVM_INCLUDE_DOCS ON)
+endif()
+if (NOT DEFINED LLVM_ENABLE_SPHINX)
+  set(LLVM_ENABLE_SPHINX OFF)
+endif()
 
-  # Add LLVM Functions --------------------------------------------------------
-  if (LLVM_FOUND AND LIBCXX_USING_INSTALLED_LLVM)
-    include(LLVMConfig) # For TARGET_TRIPLE
-  else()
-    if (WIN32)
-      set(LLVM_ON_UNIX 0)
-      set(LLVM_ON_WIN32 1)
-    else()
-      set(LLVM_ON_UNIX 1)
-      set(LLVM_ON_WIN32 0)
-    endif()
-  endif()
-  if (LLVM_FOUND)
-    include(AddLLVM OPTIONAL)
-  endif()
+# In a standalone build, we don't have llvm to automatically generate the
+# llvm-lit script for us.  So we need to provide an explicit directory that
+# the configurator should write the script into.
+set(LLVM_LIT_OUTPUT_DIR "${libcxx_BINARY_DIR}/bin")
 
-  # LLVM Options --------------------------------------------------------------
-  if (NOT DEFINED LLVM_INCLUDE_TESTS)
-    set(LLVM_INCLUDE_TESTS ${LLVM_FOUND})
-  endif()
-  if (NOT DEFINED LLVM_INCLUDE_DOCS)
-    set(LLVM_INCLUDE_DOCS ${LLVM_FOUND})
-  endif()
-  if (NOT DEFINED LLVM_ENABLE_SPHINX)
-    set(LLVM_ENABLE_SPHINX OFF)
+if (LLVM_INCLUDE_TESTS)
+  # Required LIT Configuration ------------------------------------------------
+  # Define the default arguments to use with 'lit', and an option for the user
+  # to override.
+  set(LLVM_DEFAULT_EXTERNAL_LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
+  set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
+  if (MSVC OR XCODE)
+    set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
   endif()
+  set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
+endif()
 
-  # In a standalone build, we don't have llvm to automatically generate the
-  # llvm-lit script for us.  So we need to provide an explicit directory that
-  # the configurator should write the script into.
-  set(LLVM_LIT_OUTPUT_DIR "${libcxx_BINARY_DIR}/bin")
-
-  if (LLVM_INCLUDE_TESTS)
-    # Required LIT Configuration ------------------------------------------------
-    # Define the default arguments to use with 'lit', and an option for the user
-    # to override.
-    set(LLVM_DEFAULT_EXTERNAL_LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
-    set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
-    if (MSVC OR XCODE)
-      set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
-    endif()
-    set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
-  endif()
-
-  # Required doc configuration
-  if (LLVM_ENABLE_SPHINX)
-    find_package(Sphinx REQUIRED)
-  endif()
-
-  if (LLVM_ON_UNIX AND NOT APPLE)
-    set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
-  else()
-    set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
-  endif()
-endmacro(configure_out_of_tree_llvm)
+# Required doc configuration
+if (LLVM_ENABLE_SPHINX)
+  find_package(Sphinx REQUIRED)
+endif()
 
-configure_out_of_tree_llvm()
+if (LLVM_ON_UNIX AND NOT APPLE)
+  set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
+else()
+  set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
+endif()
diff --git a/gnu/llvm/libcxx/cmake/caches/Apple.cmake b/gnu/llvm/libcxx/cmake/caches/Apple.cmake
index af4ea2c4c09..622a3af84f2 100644
--- a/gnu/llvm/libcxx/cmake/caches/Apple.cmake
+++ b/gnu/llvm/libcxx/cmake/caches/Apple.cmake
@@ -2,14 +2,17 @@ set(CMAKE_BUILD_TYPE MinSizeRel CACHE STRING "")
 set(CMAKE_POSITION_INDEPENDENT_CODE OFF CACHE BOOL "")
 
 set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
-set(LIBCXX_ENABLE_ASSERTIONS ON CACHE BOOL "")
-
+set(LIBCXX_ENABLE_ASSERTIONS OFF CACHE BOOL "")
 set(LIBCXX_ABI_VERSION "1" CACHE STRING "")
-
 set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
 set(LIBCXX_ENABLE_STATIC OFF CACHE BOOL "")
-
+set(LIBCXX_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION "1" CACHE STRING "")
+set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")
 set(LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS OFF CACHE BOOL "")
-set(LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS ON CACHE BOOL "")
-
 set(LIBCXX_HIDE_FROM_ABI_PER_TU_BY_DEFAULT ON CACHE BOOL "")
+
+set(LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS ON CACHE BOOL "")
+set(LIBCXXABI_ENABLE_PIC OFF CACHE BOOL "")
+set(LIBCXXABI_ENABLE_ASSERTIONS OFF CACHE BOOL "")
+set(LIBCXXABI_ENABLE_FORGIVING_DYNAMIC_CAST ON CACHE BOOL "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-32bits.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-32bits.cmake
new file mode 100644
index 00000000000..ae7b2ac3e8d
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-32bits.cmake
@@ -0,0 +1 @@
+set(LLVM_BUILD_32_BITS ON CACHE BOOL "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-asan.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-asan.cmake
new file mode 100644
index 00000000000..cf919765c3a
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-asan.cmake
@@ -0,0 +1 @@
+set(LLVM_USE_SANITIZER "Address" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-cxx03.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-cxx03.cmake
new file mode 100644
index 00000000000..5edb1c4cd2d
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-cxx03.cmake
@@ -0,0 +1,2 @@
+set(LIBCXX_TEST_PARAMS "std=c++03" CACHE STRING "")
+set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-cxx11.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-cxx11.cmake
new file mode 100644
index 00000000000..f0f89c44d40
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-cxx11.cmake
@@ -0,0 +1,2 @@
+set(LIBCXX_TEST_PARAMS "std=c++11" CACHE STRING "")
+set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-cxx14.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-cxx14.cmake
new file mode 100644
index 00000000000..29c688d926b
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-cxx14.cmake
@@ -0,0 +1,2 @@
+set(LIBCXX_TEST_PARAMS "std=c++14" CACHE STRING "")
+set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-cxx17.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-cxx17.cmake
new file mode 100644
index 00000000000..35bac92070b
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-cxx17.cmake
@@ -0,0 +1,2 @@
+set(LIBCXX_TEST_PARAMS "std=c++17" CACHE STRING "")
+set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-cxx2a.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-cxx2a.cmake
new file mode 100644
index 00000000000..1a07a99563d
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-cxx2a.cmake
@@ -0,0 +1,2 @@
+set(LIBCXX_TEST_PARAMS "std=c++2a" CACHE STRING "")
+set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-msan.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-msan.cmake
new file mode 100644
index 00000000000..7c948f51642
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-msan.cmake
@@ -0,0 +1 @@
+set(LLVM_USE_SANITIZER "MemoryWithOrigins" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-noexceptions.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-noexceptions.cmake
new file mode 100644
index 00000000000..f0dffef60db
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-noexceptions.cmake
@@ -0,0 +1,2 @@
+set(LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
+set(LIBCXXABI_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-singlethreaded.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-singlethreaded.cmake
new file mode 100644
index 00000000000..616baef1be7
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-singlethreaded.cmake
@@ -0,0 +1,3 @@
+set(LIBCXX_ENABLE_THREADS OFF CACHE BOOL "")
+set(LIBCXXABI_ENABLE_THREADS OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_MONOTONIC_CLOCK OFF CACHE BOOL "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-tsan.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-tsan.cmake
new file mode 100644
index 00000000000..a4b599e3e50
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-tsan.cmake
@@ -0,0 +1 @@
+set(LLVM_USE_SANITIZER "Thread" CACHE STRING "")
diff --git a/gnu/llvm/libcxx/cmake/caches/Generic-ubsan.cmake b/gnu/llvm/libcxx/cmake/caches/Generic-ubsan.cmake
new file mode 100644
index 00000000000..7ad891e4aed
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/Generic-ubsan.cmake
@@ -0,0 +1,2 @@
+set(LLVM_USE_SANITIZER "Undefined" CACHE STRING "")
+set(LIBCXX_ABI_UNSTABLE ON CACHE BOOL "")
diff --git a/gnu/llvm/libcxx/cmake/caches/README.md b/gnu/llvm/libcxx/cmake/caches/README.md
new file mode 100644
index 00000000000..60837ee2940
--- /dev/null
+++ b/gnu/llvm/libcxx/cmake/caches/README.md
@@ -0,0 +1,13 @@
+# libc++ / libc++abi configuration caches
+
+This directory contains CMake caches for the supported configurations of libc++.
+Some of the configurations are specific to a vendor, others are generic and not
+tied to any vendor.
+
+While we won't explicitly work to break configurations not listed here, any
+configuration not listed here is not explicitly supported. If you use or ship
+libc++ under a configuration not listed here, you should work with the libc++
+maintainers to make it into a supported configuration and add it here.
+
+Similarly, adding any new configuration that's not already covered must be
+discussed with the libc++ maintainers as it entails a maintenance burden.
diff --git a/gnu/llvm/libcxx/cmake/config-ix.cmake b/gnu/llvm/libcxx/cmake/config-ix.cmake
index 89e5d17c60f..894f637f814 100644
--- a/gnu/llvm/libcxx/cmake/config-ix.cmake
+++ b/gnu/llvm/libcxx/cmake/config-ix.cmake
@@ -16,7 +16,11 @@ if (NOT LIBCXX_USE_COMPILER_RT)
   if(WIN32 AND NOT MINGW)
     set(LIBCXX_HAS_GCC_S_LIB NO)
   else()
-    check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXX_HAS_GCC_S_LIB)
+    if(ANDROID)
+      check_library_exists(gcc __gcc_personality_v0 "" LIBCXX_HAS_GCC_LIB)
+    else()
+      check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXX_HAS_GCC_S_LIB)
+    endif()
   endif()
 endif()
 
@@ -37,6 +41,8 @@ if (LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
     list(APPEND CMAKE_REQUIRED_FLAGS -rtlib=compiler-rt)
     find_compiler_rt_library(builtins LIBCXX_BUILTINS_LIBRARY)
     list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBCXX_BUILTINS_LIBRARY}")
+  elseif (LIBCXX_HAS_GCC_LIB)
+    list(APPEND CMAKE_REQUIRED_LIBRARIES gcc)
   elseif (LIBCXX_HAS_GCC_S_LIB)
     list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
   endif ()
@@ -72,10 +78,6 @@ int main() { return 0; }
   cmake_pop_check_state()
 endif()
 
-if(NOT WIN32 OR MINGW)
-  include(CheckLibcxxAtomic)
-endif()
-
 # Check libraries
 if(WIN32 AND NOT MINGW)
   # TODO(compnerd) do we want to support an emulation layer that allows for the
@@ -84,19 +86,23 @@ if(WIN32 AND NOT MINGW)
   set(LIBCXX_HAS_M_LIB NO)
   set(LIBCXX_HAS_RT_LIB NO)
   set(LIBCXX_HAS_SYSTEM_LIB NO)
+  set(LIBCXX_HAS_ATOMIC_LIB NO)
 elseif(APPLE)
   check_library_exists(System write "" LIBCXX_HAS_SYSTEM_LIB)
   set(LIBCXX_HAS_PTHREAD_LIB NO)
   set(LIBCXX_HAS_M_LIB NO)
   set(LIBCXX_HAS_RT_LIB NO)
+  set(LIBCXX_HAS_ATOMIC_LIB NO)
 elseif(FUCHSIA)
   set(LIBCXX_HAS_M_LIB NO)
   set(LIBCXX_HAS_PTHREAD_LIB NO)
   set(LIBCXX_HAS_RT_LIB NO)
   set(LIBCXX_HAS_SYSTEM_LIB NO)
+  check_library_exists(atomic __atomic_fetch_add_8 "" LIBCXX_HAS_ATOMIC_LIB)
 else()
   check_library_exists(pthread pthread_create "" LIBCXX_HAS_PTHREAD_LIB)
   check_library_exists(m ccos "" LIBCXX_HAS_M_LIB)
   check_library_exists(rt clock_gettime "" LIBCXX_HAS_RT_LIB)
   set(LIBCXX_HAS_SYSTEM_LIB NO)
+  check_library_exists(atomic __atomic_fetch_add_8 "" LIBCXX_HAS_ATOMIC_LIB)
 endif()
diff --git a/gnu/llvm/libcxx/docs/BuildingLibcxx.rst b/gnu/llvm/libcxx/docs/BuildingLibcxx.rst
index f2fff0e1f30..c85c3d7fbcb 100644
--- a/gnu/llvm/libcxx/docs/BuildingLibcxx.rst
+++ b/gnu/llvm/libcxx/docs/BuildingLibcxx.rst
@@ -52,23 +52,21 @@ The instructions are for building libc++ on
 FreeBSD, Linux, or Mac using `libc++abi`_ as the C++ ABI library.
 On Linux, it is also possible to use :ref:`libsupc++ <libsupcxx>` or libcxxrt.
 
-It is possible to keep your LLVM and libc++ trees separate so you can avoid
-rebuilding LLVM as often. An out-of-tree build would look like this:
+It is possible to build libc++ standalone (i.e. without building other LLVM
+projects). A standalone build would look like this:
 
 .. code-block:: bash
 
-  $ cd where-you-want-libcxx-to-live
-  $ # Check out the sources (includes everything, but we'll only use libcxx)
-  $ ``git clone https://github.com/llvm/llvm-project.git``
-  $ cd where-you-want-to-build
+  $ git clone https://github.com/llvm/llvm-project.git llvm-project
+  $ cd llvm-project
   $ mkdir build && cd build
-  $ export CC=clang CXX=clang++
-  $ cmake -DLLVM_PATH=path/to/separate/llvm \
+  $ cmake -DCMAKE_C_COMPILER=clang \
+          -DCMAKE_CXX_COMPILER=clang++ \
           -DLIBCXX_CXX_ABI=libcxxabi \
           -DLIBCXX_CXX_ABI_INCLUDE_PATHS=path/to/separate/libcxxabi/include \
-          path/to/llvm-project/libcxx
+          ../libcxx
   $ make
-  $ make check-libcxx # optional
+  $ make check-cxx # optional
 
 
 Experimental Support for Windows
@@ -166,7 +164,7 @@ libc++ specific options
 
 .. option:: LIBCXX_ENABLE_ASSERTIONS:BOOL
 
-  **Default**: ``ON``
+  **Default**: ``OFF``
 
   Build libc++ with assertions enabled.
 
@@ -380,18 +378,24 @@ The following options allow building libc++ for a different ABI version.
   See ``include/__config`` for the list of ABI macros.
 
 
-.. option:: LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT
+.. option:: LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION
+
+  **Default**: ``None``, which lets the library figure out which implementation
+  to use based on the object format.
 
-  **Default**: ``None``. When defined this option overrides the libraries default configuration
-  for whether merged type info names are present.
+  This setting defines what implementation to use for comparing typeinfo objects.
+  There are two main implementations, which differ on whether we make the assumption
+  that type info names for a type have been fully merged are unique across the entire
+  program. This may not be the case for libraries built with ``-Bsymbolic`` or due to
+  compiler or linker bugs (Ex. llvm.org/PR37398).
 
 
-  Build ``std::type_info`` with the assumption that type info names for a type have been fully
-  merged are unique across the entire program. This may not be the case for libraries built with
-  ``-Bsymbolic`` or due to compiler or linker bugs (Ex. llvm.org/PR37398).
+  When the value is set to ``1``, we assume that typeinfos are unique across the
+  whole program, and typeinfo comparisons compare only the pointer value.
 
-  When the value is ``ON`` typeinfo comparisons compare only the pointer value, otherwise ``strcmp``
-  is used as a fallback.
+  When the value is set to ``2``, we do not assume that typeinfos are unique across
+  the whole program. We first compare the pointers, and then use ``strcmp`` on the
+  typeinfo names as a fallback.
 
 
 .. _LLVM-specific variables:
diff --git a/gnu/llvm/libcxx/docs/DesignDocs/AvailabilityMarkup.rst b/gnu/llvm/libcxx/docs/DesignDocs/AvailabilityMarkup.rst
index f076dfecdaa..87ad0abb62d 100644
--- a/gnu/llvm/libcxx/docs/DesignDocs/AvailabilityMarkup.rst
+++ b/gnu/llvm/libcxx/docs/DesignDocs/AvailabilityMarkup.rst
@@ -65,37 +65,26 @@ Some parameters can be passed to lit to run the test-suite and exercise the
 availability.
 
 * The `platform` parameter controls the deployment target. For example lit can
-  be invoked with `--param=platform=macosx10.8`. Default is the current host.
-* The `use_system_cxx_lib` parameter indicates to use another library than the
-  just built one. Invoking lit with `--param=use_system_cxx_lib=true` will run
-  the test-suite against the host system library. Alternatively a path to the
-  directory containing a specific prebuilt libc++ can be used, for example:
-  `--param=use_system_cxx_lib=/path/to/macOS/10.8/`.
+  be invoked with `--param=platform=macosx10.12`. Default is the current host.
+* The `use_system_cxx_lib` parameter indicates that the test suite is being run
+  against a system library.
 
 Tests can be marked as XFAIL based on multiple features made available by lit:
 
+* if `--param=platform=macosx10.12` is passed, the following features will be available:
 
-* if `--param=platform=macosx10.8` is passed, the following features will be available:
-
-  - availability
-  - availability=x86_64
   - availability=macosx
-  - availability=x86_64-macosx
-  - availability=x86_64-apple-macosx10.8
-  - availability=macosx10.8
+  - availability=macosx10.12
 
   This feature is used to XFAIL a test that *is* using a class or a method marked
   as unavailable *and* that is expected to *fail* if deployed on an older system.
 
-* if `use_system_cxx_lib` and `--param=platform=macosx10.8` are passed to lit,
+* if `use_system_cxx_lib` and `--param=platform=macosx10.12` are passed to lit,
   the following features will also be available:
 
-  - with_system_cxx_lib
-  - with_system_cxx_lib=x86_64
   - with_system_cxx_lib=macosx
-  - with_system_cxx_lib=x86_64-macosx
-  - with_system_cxx_lib=x86_64-apple-macosx10.8
-  - with_system_cxx_lib=macosx10.8
+  - with_system_cxx_lib=macosx10.12
+  - with_system_cxx_lib=x86_64-apple-macosx10.12
 
   This feature is used to XFAIL a test that is *not* using a class or a method
   marked as unavailable *but* that is expected to fail if deployed on an older
diff --git a/gnu/llvm/libcxx/docs/FeatureTestMacroTable.rst b/gnu/llvm/libcxx/docs/FeatureTestMacroTable.rst
index 3dd00fabf62..a6867fb30a3 100644
--- a/gnu/llvm/libcxx/docs/FeatureTestMacroTable.rst
+++ b/gnu/llvm/libcxx/docs/FeatureTestMacroTable.rst
@@ -100,7 +100,7 @@ Status
     ------------------------------------------------- -----------------
     ``__cpp_lib_gcd_lcm``                             ``201606L``      
     ------------------------------------------------- -----------------
-    ``__cpp_lib_hardware_interference_size``          ``201703L``      
+    ``__cpp_lib_hardware_interference_size``          *unimplemented*  
     ------------------------------------------------- -----------------
     ``__cpp_lib_has_unique_object_representations``   ``201606L``      
     ------------------------------------------------- -----------------
@@ -168,6 +168,8 @@ Status
     ------------------------------------------------- -----------------
     **C++ 2a**                                                         
     -------------------------------------------------------------------
+    ``__cpp_lib_array_constexpr``                     ``201811L``      
+    ------------------------------------------------- -----------------
     ``__cpp_lib_atomic_ref``                          *unimplemented*  
     ------------------------------------------------- -----------------
     ``__cpp_lib_bind_front``                          *unimplemented*  
@@ -186,7 +188,7 @@ Status
     ------------------------------------------------- -----------------
     ``__cpp_lib_endian``                              ``201907L``      
     ------------------------------------------------- -----------------
-    ``__cpp_lib_erase_if``                            ``201811L``      
+    ``__cpp_lib_erase_if``                            ``202002L``      
     ------------------------------------------------- -----------------
     ``__cpp_lib_generic_unordered_lookup``            *unimplemented*  
     ------------------------------------------------- -----------------
@@ -194,11 +196,17 @@ Status
     ------------------------------------------------- -----------------
     ``__cpp_lib_is_constant_evaluated``               ``201811L``      
     ------------------------------------------------- -----------------
-    ``__cpp_lib_list_remove_return_type``             *unimplemented*  
+    ``__cpp_lib_list_remove_return_type``             ``201806L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_math_constants``                      ``201907L``      
     ------------------------------------------------- -----------------
     ``__cpp_lib_ranges``                              *unimplemented*  
     ------------------------------------------------- -----------------
+    ``__cpp_lib_span``                                ``202002L``      
+    ------------------------------------------------- -----------------
     ``__cpp_lib_three_way_comparison``                *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_to_array``                            ``201907L``      
     ================================================= =================
 
 
diff --git a/gnu/llvm/libcxx/docs/ReleaseNotes.rst b/gnu/llvm/libcxx/docs/ReleaseNotes.rst
index f57c915a445..001957570c9 100644
--- a/gnu/llvm/libcxx/docs/ReleaseNotes.rst
+++ b/gnu/llvm/libcxx/docs/ReleaseNotes.rst
@@ -1,5 +1,5 @@
 ===========================
-Libc++ 10.0.0 Release Notes
+Libc++ 11.0.0 Release Notes
 ===========================
 
 .. contents::
@@ -12,7 +12,7 @@ Introduction
 ============
 
 This document contains the release notes for the libc++ C++ Standard Library,
-part of the LLVM Compiler Infrastructure, release 10.0.0. Here we describe the
+part of the LLVM Compiler Infrastructure, release 11.0.0. Here we describe the
 status of libc++ in some detail, including major improvements from the previous
 release and new feature work. For the general LLVM release notes, see `the LLVM
 documentation <https://llvm.org/docs/ReleaseNotes.html>`_. All LLVM releases may
@@ -21,10 +21,10 @@ be downloaded from the `LLVM releases web site <https://llvm.org/releases/>`_.
 For more information about libc++, please see the `Libc++ Web Site
 <https://libcxx.llvm.org>`_ or the `LLVM Web Site <https://llvm.org>`_.
 
-What's New in Libc++ 10.0.0?
+What's New in Libc++ 11.0.0?
 ============================
 
-Fixes
------
+New Features
+------------
 
-- Fixed use of non-default locales on Windows
+- ``<numbers>``
diff --git a/gnu/llvm/libcxx/docs/TestingLibcxx.rst b/gnu/llvm/libcxx/docs/TestingLibcxx.rst
index eaba214390d..0c9c87d489b 100644
--- a/gnu/llvm/libcxx/docs/TestingLibcxx.rst
+++ b/gnu/llvm/libcxx/docs/TestingLibcxx.rst
@@ -8,9 +8,9 @@ Testing libc++
 Getting Started
 ===============
 
-libc++ uses LIT to configure and run its tests. 
+libc++ uses LIT to configure and run its tests.
 
-The primary way to run the libc++ tests is by using `make check-libcxx`. 
+The primary way to run the libc++ tests is by using ``make check-cxx``.
 
 However since libc++ can be used in any number of possible
 configurations it is important to customize the way LIT builds and runs
@@ -19,40 +19,23 @@ test libc++.
 
 Please see the `Lit Command Guide`_ for more information about LIT.
 
-.. _LIT Command Guide: http://llvm.org/docs/CommandGuide/lit.html
+.. _LIT Command Guide: https://llvm.org/docs/CommandGuide/lit.html
 
-Setting up the Environment
---------------------------
+Usage
+-----
 
-After building libc++ you must setup your environment to test libc++ using
-LIT.
-
-#. Create a shortcut to the actual lit executable so that you can invoke it
-   easily from the command line.
-
-   .. code-block:: bash
-
-     $ alias lit='python path/to/llvm/utils/lit/lit.py'
-
-#. Tell LIT where to find your build configuration.
-
-   .. code-block:: bash
-
-     $ export LIBCXX_SITE_CONFIG=path/to/build-libcxx/test/lit.site.cfg
-
-Example Usage
--------------
-
-Once you have your environment set up and you have built libc++ you can run
-parts of the libc++ test suite by simply running `lit` on a specified test or
-directory. For example:
+After building libc++, you can run parts of the libc++ test suite by simply
+running ``llvm-lit`` on a specified test or directory. If you're unsure
+whether the required libraries have been built, you can use the
+`check-cxx-deps` target. For example:
 
 .. code-block:: bash
 
-  $ cd path/to/src/libcxx
-  $ lit -sv test/std/re # Run all of the std::regex tests
-  $ lit -sv test/std/depr/depr.c.headers/stdlib_h.pass.cpp # Run a single test
-  $ lit -sv test/std/atomics test/std/threads # Test std::thread and std::atomic
+  $ cd <monorepo-root>
+  $ make -C <build> check-cxx-deps # If you want to make sure the targets get rebuilt
+  $ <build>/bin/llvm-lit -sv libcxx/test/std/re # Run all of the std::regex tests
+  $ <build>/bin/llvm-lit -sv libcxx/test/std/depr/depr.c.headers/stdlib_h.pass.cpp # Run a single test
+  $ <build>/bin/llvm-lit -sv libcxx/test/std/atomics libcxx/test/std/threads # Test std::thread and std::atomic
 
 Sometimes you'll want to change the way LIT is running the tests. Custom options
 can be specified using the `--param=<name>=<val>` flag. The most common option
@@ -62,29 +45,49 @@ that. However if you want to manually specify the option like so:
 
 .. code-block:: bash
 
-  $ lit -sv test/std/containers # Run the tests with the newest -std
-  $ lit -sv --param=std=c++03 test/std/containers # Run the tests in C++03
+  $ <build>/bin/llvm-lit -sv libcxx/test/std/containers # Run the tests with the newest -std
+  $ <build>/bin/llvm-lit -sv libcxx/test/std/containers --param=std=c++03 # Run the tests in C++03
 
 Occasionally you'll want to add extra compile or link flags when testing.
 You can do this as follows:
 
 .. code-block:: bash
 
-  $ lit -sv --param=compile_flags='-Wcustom-warning'
-  $ lit -sv --param=link_flags='-L/custom/library/path'
+  $ <build>/bin/llvm-lit -sv libcxx/test --param=compile_flags='-Wcustom-warning'
+  $ <build>/bin/llvm-lit -sv libcxx/test --param=link_flags='-L/custom/library/path'
 
 Some other common examples include:
 
 .. code-block:: bash
 
   # Specify a custom compiler.
-  $ lit -sv --param=cxx_under_test=/opt/bin/g++ test/std
+  $ <build>/bin/llvm-lit -sv libcxx/test/std --param=cxx_under_test=/opt/bin/g++
 
   # Enable warnings in the test suite
-  $ lit -sv --param=enable_warnings=true test/std
+  $ <build>/bin/llvm-lit -sv libcxx/test --param=enable_warnings=true
 
   # Use UBSAN when running the tests.
-  $ lit -sv --param=use_sanitizer=Undefined
+  $ <build>/bin/llvm-lit -sv libcxx/test --param=use_sanitizer=Undefined
+
+Using a custom site configuration
+---------------------------------
+
+By default, the libc++ test suite will use a site configuration that matches
+the current CMake configuration. It does so by generating a ``lit.site.cfg``
+file in the build directory from the ``libcxx/test/lit.site.cfg.in`` template,
+and pointing ``llvm-lit`` (which is a wrapper around ``llvm/utils/lit/lit.py``)
+to that file. So when you're running ``<build>/bin/llvm-lit``, the generated
+``lit.site.cfg`` file is always loaded instead of ``libcxx/test/lit.cfg.py``.
+If you want to use a custom site configuration, simply point the CMake build
+to it using ``-DLIBCXX_TEST_CONFIG=<path-to-site-config>``, and that site
+configuration will be used instead. That file can use CMake variables inside
+itself to make configuration easier.
+
+   .. code-block:: bash
+
+     $ cmake <options> -DLIBCXX_TEST_CONFIG=<path-to-site-config>
+     $ make -C <build> check-cxx-deps
+     $ <build>/bin/llvm-lit -sv libcxx/test # will use your custom config file
 
 
 LIT Options
@@ -95,9 +98,10 @@ LIT Options
 Command Line Options
 --------------------
 
-To use these options you pass them on the LIT command line as --param NAME or
---param NAME=VALUE. Some options have default values specified during CMake's
-configuration. Passing the option on the command line will override the default.
+To use these options you pass them on the LIT command line as ``--param NAME``
+or ``--param NAME=VALUE``. Some options have default values specified during
+CMake's configuration. Passing the option on the command line will override the
+default.
 
 .. program:: lit
 
@@ -105,25 +109,20 @@ configuration. Passing the option on the command line will override the default.
 
   Specify the compiler used to build the tests.
 
-.. option:: cxx_stdlib_under_test=<stdlib name>
+.. option:: stdlib=<stdlib name>
 
-  **Values**: libc++, libstdc++
+  **Values**: libc++, libstdc++, msvc
 
-  Specify the C++ standard library being tested. Unless otherwise specified
-  libc++ is used. This option is intended to allow running the libc++ test
-  suite against other standard library implementations.
+  Specify the C++ standard library being tested. The default is libc++ if this
+  option is not provided. This option is intended to allow running the libc++
+  test suite against other standard library implementations.
 
 .. option:: std=<standard version>
 
-  **Values**: c++98, c++03, c++11, c++14, c++17, c++2a
+  **Values**: c++03, c++11, c++14, c++17, c++2a
 
   Change the standard version used when building the tests.
 
-.. option:: libcxx_site_config=<path/to/lit.site.cfg>
-
-  Specify the site configuration to use when running the tests.  This option
-  overrides the environment variable LIBCXX_SITE_CONFIG.
-
 .. option:: cxx_headers=<path/to/headers>
 
   Specify the c++ standard library headers that are tested. By default the
@@ -132,8 +131,7 @@ configuration. Passing the option on the command line will override the default.
 .. option:: cxx_library_root=<path/to/lib/>
 
   Specify the directory of the libc++ library to be tested. By default the
-  library folder of the build directory is used. This option cannot be used
-  when use_system_cxx_lib is provided.
+  library folder of the build directory is used.
 
 
 .. option:: cxx_runtime_root=<path/to/lib/>
@@ -148,23 +146,10 @@ configuration. Passing the option on the command line will override the default.
   **Default**: False
 
   Enable or disable testing against the installed version of libc++ library.
-  Note: This does not use the installed headers.
-
-.. option:: use_lit_shell=<bool>
-
-  Enable or disable the use of LIT's internal shell in ShTests. If the
-  environment variable LIT_USE_INTERNAL_SHELL is present then that is used as
-  the default value. Otherwise the default value is True on Windows and False
-  on every other platform.
-
-.. option:: compile_flags="<list-of-args>"
-
-  Specify additional compile flags as a space delimited string.
-  Note: This options should not be used to change the standard version used.
-
-.. option:: link_flags="<list-of-args>"
-
-  Specify additional link flags as a space delimited string.
+  This impacts whether the ``with_system_cxx_lib`` Lit feature is defined or
+  not. The ``cxx_library_root`` and ``cxx_runtime_root`` parameters should
+  still be used to specify the path of the library to link to and run against,
+  respectively.
 
 .. option:: debug_level=<level>
 
@@ -180,12 +165,6 @@ configuration. Passing the option on the command line will override the default.
   Run the tests using the given sanitizer. If LLVM_USE_SANITIZER was given when
   building libc++ then that sanitizer will be used by default.
 
-.. option:: color_diagnostics
-
-  Enable the use of colorized compile diagnostics. If the color_diagnostics
-  option is specified or the environment variable LIBCXX_COLOR_DIAGNOSTICS is
-  present then color diagnostics will be enabled.
-
 .. option:: llvm_unwinder
 
   Enable the use of LLVM unwinder instead of libgcc.
@@ -195,19 +174,28 @@ configuration. Passing the option on the command line will override the default.
   Path to the builtins library to use instead of libgcc.
 
 
-Environment Variables
----------------------
-
-.. envvar:: LIBCXX_SITE_CONFIG=<path/to/lit.site.cfg>
-
-  Specify the site configuration to use when running the tests.
-  Also see `libcxx_site_config`.
-
-.. envvar:: LIBCXX_COLOR_DIAGNOSTICS
+Writing Tests
+-------------
 
-  If ``LIBCXX_COLOR_DIAGNOSTICS`` is defined then the test suite will attempt
-  to use color diagnostic outputs from the compiler.
-  Also see `color_diagnostics`.
+When writing tests for the libc++ test suite, you should follow a few guidelines.
+This will ensure that your tests can run on a wide variety of hardware and under
+a wide variety of configurations. We have several unusual configurations such as
+building the tests on one host but running them on a different host, which add a
+few requirements to the test suite. Here's some stuff you should know:
+
+- All tests are run in a temporary directory that is unique to that test and
+  cleaned up after the test is done.
+- When a test needs data files as inputs, these data files can be saved in the
+  repository (when reasonable) and referrenced by the test as
+  ``// FILE_DEPENDENCIES: <path-to-dependencies>``. Copies of these files or
+  directories will be made available to the test in the temporary directory
+  where it is run.
+- You should never hardcode a path from the build-host in a test, because that
+  path will not necessarily be available on the host where the tests are run.
+- You should try to reduce the runtime dependencies of each test to the minimum.
+  For example, requiring Python to run a test is bad, since Python is not
+  necessarily available on all devices we may want to run the tests on (even
+  though supporting Python is probably trivial for the build-host).
 
 Benchmarks
 ==========
diff --git a/gnu/llvm/libcxx/docs/UsingLibcxx.rst b/gnu/llvm/libcxx/docs/UsingLibcxx.rst
index 05721bf271a..4c37ada334b 100644
--- a/gnu/llvm/libcxx/docs/UsingLibcxx.rst
+++ b/gnu/llvm/libcxx/docs/UsingLibcxx.rst
@@ -180,7 +180,7 @@ thread safety annotations.
   Since libc++ 4.0 this extension has been disabled by default. This macro
   may be defined to re-enable it in order to support existing code that depends
   on the extension. New use of this extension should be discouraged.
-  See `PR 27374 <http://llvm.org/PR27374>`_ for more information.
+  See `PR 27374 <https://llvm.org/PR27374>`_ for more information.
 
   Note: The "reduced-arity-initialization" extension is still offered but only
   for explicit conversions. Example:
diff --git a/gnu/llvm/libcxx/docs/conf.py b/gnu/llvm/libcxx/docs/conf.py
index 414f1bc3cc8..00000eec027 100644
--- a/gnu/llvm/libcxx/docs/conf.py
+++ b/gnu/llvm/libcxx/docs/conf.py
@@ -47,9 +47,9 @@ copyright = u'2011-2018, LLVM Project'
 # built documents.
 #
 # The short X.Y version.
-version = '10.0'
+version = '11.0'
 # The full version, including alpha/beta/rc tags.
-release = '10.0'
+release = '11.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/gnu/llvm/libcxx/docs/index.rst b/gnu/llvm/libcxx/docs/index.rst
index 04df9cfcc4a..c60a72d4972 100644
--- a/gnu/llvm/libcxx/docs/index.rst
+++ b/gnu/llvm/libcxx/docs/index.rst
@@ -85,25 +85,46 @@ reasons, but some of the major ones are:
 Platform and Compiler Support
 -----------------------------
 
-libc++ is known to work on the following platforms, using gcc and
-clang.
-Note that functionality provided by ``<atomic>`` is only functional with clang
-and GCC.
+For using the libc++ headers
+############################
+The libc++ headers are known to work on the following platforms, using GCC and
+Clang. Note that functionality provided by ``<atomic>`` is only functional with
+Clang and GCC.
+
+============ ==================== ============
+OS           Arch                 Compilers
+============ ==================== ============
+macOS 10.9+  i386, x86_64         Clang, GCC
+FreeBSD 10+  i386, x86_64, ARM    Clang, GCC
+Linux        i386, x86_64         Clang, GCC
+============ ==================== ============
+
+The following minimum compiler versions are required:
+
+* Clang 4.0 and above
+* GCC 5.0 and above.
+
+The C++03 dialect is only supported with Clang.
+
+For building the libc++ library
+###############################
+Building the libc++ library (static or shared) requires some features from
+the operating system. As such, it has its own set of (slightly different)
+system requirements.
 
 ============ ==================== ============ ========================
 OS           Arch                 Compilers    ABI Library
 ============ ==================== ============ ========================
-macOS        i386, x86_64         Clang, GCC   libc++abi
+macOS 10.12+ i386, x86_64         Clang, GCC   libc++abi
 FreeBSD 10+  i386, x86_64, ARM    Clang, GCC   libcxxrt, libc++abi
 Linux        i386, x86_64         Clang, GCC   libc++abi
 ============ ==================== ============ ========================
 
-The following minimum compiler versions are strongly recommended.
+The following minimum compiler versions are required:
 
-* Clang 3.5 and above
+* Clang 4.0 and above
 * GCC 5.0 and above.
 
-The C++03 dialect is only supported for Clang compilers.
 
 C++ Dialect Support
 ---------------------
@@ -161,8 +182,8 @@ Build Bots and Test Coverage
 Getting Involved
 ================
 
-First please review our `Developer's Policy <http://llvm.org/docs/DeveloperPolicy.html>`__
-and `Getting started with LLVM <http://llvm.org/docs/GettingStarted.html>`__.
+First please review our `Developer's Policy <https://llvm.org/docs/DeveloperPolicy.html>`__
+and `Getting started with LLVM <https://llvm.org/docs/GettingStarted.html>`__.
 
 **Bug Reports**
 
@@ -173,7 +194,7 @@ can post a message to the `libcxx-dev mailing list`_ or on IRC.
 **Patches**
 
 If you want to contribute a patch to libc++, the best place for that is
-`Phabricator <http://llvm.org/docs/Phabricator.html>`_. Please add `libcxx-commits` as a subscriber.
+`Phabricator <https://llvm.org/docs/Phabricator.html>`_. Please add `libcxx-commits` as a subscriber.
 Also make sure you are subscribed to the `libcxx-commits mailing list <http://lists.llvm.org/mailman/listinfo/libcxx-commits>`_.
 
 **Discussion and Questions**
@@ -185,7 +206,7 @@ Send discussions and questions to the
 
 Quick Links
 ===========
-* `LLVM Homepage <http://llvm.org/>`_
+* `LLVM Homepage <https://llvm.org/>`_
 * `libc++abi Homepage <http://libcxxabi.llvm.org/>`_
 * `LLVM Bugzilla <https://bugs.llvm.org/>`_
 * `libcxx-commits Mailing List`_
diff --git a/gnu/llvm/libcxx/include/CMakeLists.txt b/gnu/llvm/libcxx/include/CMakeLists.txt
index 302da8a131b..be8141c9816 100644
--- a/gnu/llvm/libcxx/include/CMakeLists.txt
+++ b/gnu/llvm/libcxx/include/CMakeLists.txt
@@ -25,6 +25,7 @@ set(files
   any
   array
   atomic
+  barrier
   bit
   bitset
   cassert
@@ -44,6 +45,7 @@ set(files
   compare
   complex
   complex.h
+  concepts
   condition_variable
   csetjmp
   csignal
@@ -103,6 +105,7 @@ set(files
   iostream
   istream
   iterator
+  latch
   limits
   limits.h
   list
@@ -114,6 +117,7 @@ set(files
   module.modulemap
   mutex
   new
+  numbers
   numeric
   optional
   ostream
@@ -122,6 +126,7 @@ set(files
   ratio
   regex
   scoped_allocator
+  semaphore
   set
   setjmp.h
   shared_mutex
@@ -179,27 +184,23 @@ if(LIBCXX_INSTALL_SUPPORT_HEADERS)
     )
 endif()
 
-if (LIBCXX_NEEDS_SITE_CONFIG)
-  # Generate a custom __config header. The new header is created
-  # by prepending __config_site to the current __config header.
-  add_custom_command(OUTPUT ${LIBCXX_BINARY_DIR}/__generated_config
-    COMMAND ${PYTHON_EXECUTABLE} ${LIBCXX_SOURCE_DIR}/utils/cat_files.py
-      ${LIBCXX_BINARY_DIR}/__config_site
-      ${LIBCXX_SOURCE_DIR}/include/__config
-      -o ${LIBCXX_BINARY_DIR}/__generated_config
-    DEPENDS ${LIBCXX_SOURCE_DIR}/include/__config
-            ${LIBCXX_BINARY_DIR}/__config_site
-  )
-  # Add a target that executes the generation commands.
-  add_custom_target(cxx-generated-config ALL
-    DEPENDS ${LIBCXX_BINARY_DIR}/__generated_config)
-  set(generated_config_deps cxx-generated-config)
-else()
-  set(files
-    ${files}
-    __config
-    )
-endif()
+configure_file("__config_site.in"
+               "${LIBCXX_BINARY_DIR}/__config_site"
+               @ONLY)
+
+# Generate a custom __config header. The new header is created
+# by prepending __config_site to the current __config header.
+add_custom_command(OUTPUT ${LIBCXX_BINARY_DIR}/__generated_config
+  COMMAND ${Python3_EXECUTABLE} ${LIBCXX_SOURCE_DIR}/utils/cat_files.py
+    ${LIBCXX_BINARY_DIR}/__config_site
+    ${LIBCXX_SOURCE_DIR}/include/__config
+    -o ${LIBCXX_BINARY_DIR}/__generated_config
+  DEPENDS ${LIBCXX_SOURCE_DIR}/include/__config
+          ${LIBCXX_BINARY_DIR}/__config_site
+)
+# Add a target that executes the generation commands.
+add_custom_target(cxx-generated-config ALL
+  DEPENDS ${LIBCXX_BINARY_DIR}/__generated_config)
 
 # In some build configurations (like bootstrapping clang), we need to be able to
 # install the libcxx headers before the CMake configuration for libcxx runs. Making
@@ -209,7 +210,7 @@ endif()
 if (NOT CXX_HEADER_TARGET)
   set(CXX_HEADER_TARGET cxx-headers)
 endif()
-if(NOT LIBCXX_USING_INSTALLED_LLVM AND LIBCXX_HEADER_DIR)
+if(LIBCXX_HEADER_DIR)
   set(output_dir ${LIBCXX_HEADER_DIR}/include/c++/v1)
 
   set(out_files)
@@ -223,22 +224,34 @@ if(NOT LIBCXX_USING_INSTALLED_LLVM AND LIBCXX_HEADER_DIR)
     list(APPEND out_files ${dst})
   endforeach()
 
-  if (LIBCXX_NEEDS_SITE_CONFIG)
-    # Copy the generated header as __config into build directory.
-    set(src ${LIBCXX_BINARY_DIR}/__generated_config)
-    set(dst ${output_dir}/__config)
-    add_custom_command(OUTPUT ${dst}
-        DEPENDS ${src} ${generated_config_deps}
-        COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
-        COMMENT "Copying CXX __config")
-    list(APPEND out_files ${dst})
+  # Copy the generated header as __config into build directory.
+  set(src ${LIBCXX_BINARY_DIR}/__generated_config)
+  set(dst ${output_dir}/__config)
+  add_custom_command(OUTPUT ${dst}
+      DEPENDS ${src} cxx-generated-config
+      COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
+      COMMENT "Copying CXX __config")
+  list(APPEND out_files ${dst})
+  add_custom_target(generate-cxx-headers DEPENDS ${out_files})
+
+  add_library(${CXX_HEADER_TARGET} INTERFACE)
+  add_dependencies(${CXX_HEADER_TARGET} generate-cxx-headers ${LIBCXX_CXX_ABI_HEADER_TARGET})
+  # TODO: Use target_include_directories once we figure out why that breaks the runtimes build
+  if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR "${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC")
+    target_compile_options(${CXX_HEADER_TARGET} INTERFACE /I "${output_dir}")
+  else()
+    target_compile_options(${CXX_HEADER_TARGET} INTERFACE -I "${output_dir}")
   endif()
 
-  add_custom_target(${CXX_HEADER_TARGET} ALL DEPENDS ${out_files} ${LIBCXX_CXX_ABI_HEADER_TARGET})
+  # Make sure the generated __config_site header is included when we build the library.
+  if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR "${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC")
+    target_compile_options(${CXX_HEADER_TARGET} INTERFACE /FI "${LIBCXX_BINARY_DIR}/__config_site")
+  else()
+    target_compile_options(${CXX_HEADER_TARGET} INTERFACE -include "${LIBCXX_BINARY_DIR}/__config_site")
+  endif()
 else()
-  add_custom_target(${CXX_HEADER_TARGET})
+  add_library(${CXX_HEADER_TARGET} INTERFACE)
 endif()
-set_target_properties(${CXX_HEADER_TARGET} PROPERTIES FOLDER "Misc")
 
 if (LIBCXX_INSTALL_HEADERS)
   foreach(file ${files})
@@ -250,25 +263,20 @@ if (LIBCXX_INSTALL_HEADERS)
     )
   endforeach()
 
-  if (LIBCXX_NEEDS_SITE_CONFIG)
-    # Install the generated header as __config.
-    install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1
-      PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
-      RENAME __config
-      COMPONENT ${CXX_HEADER_TARGET})
-  endif()
+  # Install the generated header as __config.
+  install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+    DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1
+    PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+    RENAME __config
+    COMPONENT ${CXX_HEADER_TARGET})
 
   if (NOT CMAKE_CONFIGURATION_TYPES)
     add_custom_target(install-${CXX_HEADER_TARGET}
-                      DEPENDS ${CXX_HEADER_TARGET} ${generated_config_deps}
+                      DEPENDS ${CXX_HEADER_TARGET} cxx-generated-config
                       COMMAND "${CMAKE_COMMAND}"
                               -DCMAKE_INSTALL_COMPONENT=${CXX_HEADER_TARGET}
                               -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
     # Stripping is a no-op for headers
     add_custom_target(install-${CXX_HEADER_TARGET}-stripped DEPENDS install-${CXX_HEADER_TARGET})
-
-    add_custom_target(install-libcxx-headers DEPENDS install-${CXX_HEADER_TARGET})
-    add_custom_target(install-libcxx-headers-stripped DEPENDS install-${CXX_HEADER_TARGET}-stripped)
   endif()
 endif()
diff --git a/gnu/llvm/libcxx/include/__config_site.in b/gnu/llvm/libcxx/include/__config_site.in
index 1ccc158c631..a6984b2eefc 100644
--- a/gnu/llvm/libcxx/include/__config_site.in
+++ b/gnu/llvm/libcxx/include/__config_site.in
@@ -27,7 +27,9 @@
 #cmakedefine _LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL
 #cmakedefine _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS
 #cmakedefine _LIBCPP_NO_VCRUNTIME
-#cmakedefine01 _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT
+#ifndef _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION
+#cmakedefine _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION @_LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION@
+#endif
 #cmakedefine _LIBCPP_ABI_NAMESPACE @_LIBCPP_ABI_NAMESPACE@
 #cmakedefine _LIBCPP_HAS_PARALLEL_ALGORITHMS
 
diff --git a/gnu/llvm/libcxx/include/__functional_base b/gnu/llvm/libcxx/include/__functional_base
index ca761c409b6..f591bf5a9dc 100644
--- a/gnu/llvm/libcxx/include/__functional_base
+++ b/gnu/llvm/libcxx/include/__functional_base
@@ -522,7 +522,7 @@ inline _LIBCPP_INLINE_VISIBILITY
 reference_wrapper<_Tp>
 ref(reference_wrapper<_Tp> __t) _NOEXCEPT
 {
-    return ref(__t.get());
+    return _VSTD::ref(__t.get());
 }
 
 template <class _Tp>
@@ -538,7 +538,7 @@ inline _LIBCPP_INLINE_VISIBILITY
 reference_wrapper<const _Tp>
 cref(reference_wrapper<_Tp> __t) _NOEXCEPT
 {
-    return cref(__t.get());
+    return _VSTD::cref(__t.get());
 }
 
 #ifndef _LIBCPP_CXX03_LANG
diff --git a/gnu/llvm/libcxx/include/__libcpp_version b/gnu/llvm/libcxx/include/__libcpp_version
index 5caff40c4a0..82b3803a20e 100644
--- a/gnu/llvm/libcxx/include/__libcpp_version
+++ b/gnu/llvm/libcxx/include/__libcpp_version
@@ -1 +1 @@
-10000
+11000
diff --git a/gnu/llvm/libcxx/include/__string b/gnu/llvm/libcxx/include/__string
index 056b9b80ea5..9060bf98ad8 100644
--- a/gnu/llvm/libcxx/include/__string
+++ b/gnu/llvm/libcxx/include/__string
@@ -70,6 +70,123 @@ _LIBCPP_PUSH_MACROS
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+// The the extern template ABI lists are kept outside of <string> to improve the
+// readability of that header.
+
+// The extern template ABI lists are kept outside of <string> to improve the
+// readability of that header. We maintain 2 ABI lists:
+// - _LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST
+// - _LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST
+// As the name implies, the ABI lists define the V1 (Stable) and unstable ABI.
+//
+// For unstable, we may explicitly remove function that are external in V1,
+// and add (new) external functions to better control inlining and compiler
+// optimization opportunities.
+//
+// For stable, the ABI list should rarely change, except for adding new
+// functions supporting new c++ version / API changes. Typically entries
+// must never be removed from the stable list.
+#define _LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_Func, _CharType) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::rfind(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__init(value_type const*, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::basic_string(basic_string const&)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::basic_string(basic_string const&, std::allocator<_CharType> const&)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_last_not_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::~basic_string()) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_first_not_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::operator=(value_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__init(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS const _CharType& basic_string<_CharType>::at(size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_first_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::assign(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::reserve(size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::assign(basic_string const&, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::copy(value_type*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::basic_string(basic_string const&, size_type, size_type, std::allocator<_CharType> const&)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find(value_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__init(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_last_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__grow_by(size_type, size_type, size_type, size_type, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__grow_by_and_replace(size_type, size_type, size_type, size_type, size_type, size_type, value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::push_back(value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::rfind(value_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS const basic_string<_CharType>::size_type basic_string<_CharType>::npos) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::assign(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::erase(size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(basic_string const&, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(value_type const*) const) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(size_type, size_type, value_type const*) const) \
+  _Func(_LIBCPP_FUNC_VIS _CharType& basic_string<_CharType>::at(size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::assign(value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(size_type, size_type, basic_string const&, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(size_type, size_type, value_type const*, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::operator=(basic_string const&)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, basic_string const&, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::iterator basic_string<_CharType>::insert(basic_string::const_iterator, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::resize(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, basic_string const&, size_type, size_type))
+
+#define _LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_Func, _CharType) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::rfind(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__init(value_type const*, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_last_not_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::~basic_string()) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_first_not_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::operator=(value_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__init(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__init_copy_ctor_external(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS const _CharType& basic_string<_CharType>::at(size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_first_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::__assign_external(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::__assign_external(value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::reserve(size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::assign(basic_string const&, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::copy(value_type*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::basic_string(basic_string const&, size_type, size_type, std::allocator<_CharType> const&)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find(value_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__init(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find_last_of(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__grow_by(size_type, size_type, size_type, size_type, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__grow_by_and_replace(size_type, size_type, size_type, size_type, size_type, size_type, value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::__assign_no_alias<false>(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::__assign_no_alias<true>(value_type const*, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::push_back(value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::rfind(value_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS const basic_string<_CharType>::size_type basic_string<_CharType>::npos) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::assign(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::__erase_external_with_move(size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(basic_string const&, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(value_type const*) const) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(size_type, size_type, value_type const*) const) \
+  _Func(_LIBCPP_FUNC_VIS _CharType& basic_string<_CharType>::at(size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::size_type basic_string<_CharType>::find(value_type const*, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(size_type, size_type, basic_string const&, size_type, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS int basic_string<_CharType>::compare(size_type, size_type, value_type const*, size_type) const) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::append(value_type const*)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::replace(size_type, size_type, basic_string const&, size_type, size_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>::iterator basic_string<_CharType>::insert(basic_string::const_iterator, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS void basic_string<_CharType>::resize(size_type, value_type)) \
+  _Func(_LIBCPP_FUNC_VIS basic_string<_CharType>& basic_string<_CharType>::insert(size_type, basic_string const&, size_type, size_type))
+
+
 // char_traits
 
 template <class _CharT>
diff --git a/gnu/llvm/libcxx/include/__threading_support b/gnu/llvm/libcxx/include/__threading_support
index dbf313a1bf2..072c4c7bcc8 100644
--- a/gnu/llvm/libcxx/include/__threading_support
+++ b/gnu/llvm/libcxx/include/__threading_support
@@ -26,6 +26,12 @@
 #if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
 # include <pthread.h>
 # include <sched.h>
+# ifdef __APPLE__
+#  define _LIBCPP_NO_NATIVE_SEMAPHORES
+# endif
+# ifndef _LIBCPP_NO_NATIVE_SEMAPHORES
+# include <semaphore.h>
+# endif
 #elif defined(_LIBCPP_HAS_THREAD_API_C11)
 # include <threads.h>
 #endif
@@ -65,6 +71,12 @@ typedef pthread_mutex_t __libcpp_recursive_mutex_t;
 typedef pthread_cond_t __libcpp_condvar_t;
 #define _LIBCPP_CONDVAR_INITIALIZER PTHREAD_COND_INITIALIZER
 
+#ifndef _LIBCPP_NO_NATIVE_SEMAPHORES
+// Semaphore
+typedef sem_t __libcpp_semaphore_t;
+# define _LIBCPP_SEMAPHORE_MAX SEM_VALUE_MAX
+#endif
+
 // Execute once
 typedef pthread_once_t __libcpp_exec_once_flag;
 #define _LIBCPP_EXEC_ONCE_INITIALIZER PTHREAD_ONCE_INIT
@@ -127,6 +139,9 @@ typedef void* __libcpp_recursive_mutex_t[5];
 typedef void* __libcpp_condvar_t;
 #define _LIBCPP_CONDVAR_INITIALIZER 0
 
+// Semaphore
+typedef void* __libcpp_semaphore_t;
+
 // Execute Once
 typedef void* __libcpp_exec_once_flag;
 #define _LIBCPP_EXEC_ONCE_INITIALIZER 0
@@ -191,6 +206,26 @@ int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
 _LIBCPP_THREAD_ABI_VISIBILITY
 int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv);
 
+#ifndef _LIBCPP_NO_NATIVE_SEMAPHORES
+
+// Semaphore
+_LIBCPP_THREAD_ABI_VISIBILITY
+bool __libcpp_semaphore_init(__libcpp_semaphore_t* __sem, int __init);
+
+_LIBCPP_THREAD_ABI_VISIBILITY
+bool __libcpp_semaphore_destroy(__libcpp_semaphore_t* __sem);
+
+_LIBCPP_THREAD_ABI_VISIBILITY
+bool __libcpp_semaphore_post(__libcpp_semaphore_t* __sem);
+
+_LIBCPP_THREAD_ABI_VISIBILITY
+bool __libcpp_semaphore_wait(__libcpp_semaphore_t* __sem);
+
+_LIBCPP_THREAD_ABI_VISIBILITY
+bool __libcpp_semaphore_wait_timed(__libcpp_semaphore_t* __sem, chrono::nanoseconds const& __ns);
+
+#endif // _LIBCPP_NO_NATIVE_SEMAPHORES
+
 // Execute once
 _LIBCPP_THREAD_ABI_VISIBILITY
 int __libcpp_execute_once(__libcpp_exec_once_flag *flag,
@@ -242,9 +277,52 @@ int __libcpp_tls_set(__libcpp_tls_key __key, void *__p);
 
 #endif // !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
 
+struct __libcpp_timed_backoff_policy {
+  _LIBCPP_THREAD_ABI_VISIBILITY
+  bool operator()(chrono::nanoseconds __elapsed) const;
+};
+
+inline _LIBCPP_INLINE_VISIBILITY
+bool __libcpp_timed_backoff_policy::operator()(chrono::nanoseconds __elapsed) const
+{
+    if(__elapsed > chrono::milliseconds(128))
+        __libcpp_thread_sleep_for(chrono::milliseconds(8));
+    else if(__elapsed > chrono::microseconds(64))
+        __libcpp_thread_sleep_for(__elapsed / 2);
+    else if(__elapsed > chrono::microseconds(4))
+      __libcpp_thread_yield();
+    else
+      ; // poll
+    return false;
+}
+
+static _LIBCPP_CONSTEXPR const int __libcpp_polling_count = 64;
+
+template<class _Fn, class _BFn>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+bool __libcpp_thread_poll_with_backoff(
+  _Fn && __f, _BFn && __bf, chrono::nanoseconds __max_elapsed = chrono::nanoseconds::zero())
+{
+    auto const __start = chrono::high_resolution_clock::now();
+    for(int __count = 0;;) {
+      if(__f())
+        return true; // _Fn completion means success
+      if(__count < __libcpp_polling_count) {
+        __count += 1;
+        continue;
+      }
+      chrono::nanoseconds const __elapsed = chrono::high_resolution_clock::now() - __start;
+      if(__max_elapsed != chrono::nanoseconds::zero() && __max_elapsed < __elapsed)
+          return false; // timeout failure
+      if(__bf(__elapsed))
+        return false; // _BFn completion means failure
+    }
+}
+
 #if (!defined(_LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL) || \
      defined(_LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL))
 
+
 namespace __thread_detail {
 
 inline __libcpp_timespec_t __convert_to_timespec(const chrono::nanoseconds& __ns)
@@ -364,6 +442,38 @@ int __libcpp_condvar_destroy(__libcpp_condvar_t *__cv)
   return pthread_cond_destroy(__cv);
 }
 
+#ifndef _LIBCPP_NO_NATIVE_SEMAPHORES
+
+// Semaphore
+bool __libcpp_semaphore_init(__libcpp_semaphore_t* __sem, int __init)
+{
+    return sem_init(__sem, 0, __init) == 0;
+}
+
+bool __libcpp_semaphore_destroy(__libcpp_semaphore_t* __sem)
+{
+    return sem_destroy(__sem) == 0;
+}
+
+bool __libcpp_semaphore_post(__libcpp_semaphore_t* __sem)
+{
+    return sem_post(__sem) == 0;
+}
+
+bool __libcpp_semaphore_wait(__libcpp_semaphore_t* __sem)
+{
+    return sem_wait(__sem) == 0;
+}
+
+bool __libcpp_semaphore_wait_timed(__libcpp_semaphore_t* __sem, chrono::nanoseconds const& __ns)
+{
+    auto const __abs_time = chrono::system_clock::now().time_since_epoch() + __ns;
+    __libcpp_timespec_t __ts = __thread_detail::__convert_to_timespec(__abs_time);
+    return sem_timedwait(__sem, &__ts) == 0;
+}
+
+#endif //_LIBCPP_NO_NATIVE_SEMAPHORES
+
 // Execute once
 int __libcpp_execute_once(__libcpp_exec_once_flag *flag,
                           void (*init_routine)()) {
@@ -600,6 +710,7 @@ int __libcpp_tls_set(__libcpp_tls_key __key, void *__p)
 
 #endif
 
+
 #endif // !_LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL || _LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL
 
 class _LIBCPP_TYPE_VIS thread;
diff --git a/gnu/llvm/libcxx/include/array b/gnu/llvm/libcxx/include/array
index ddebf915960..e73bbe7fea5 100644
--- a/gnu/llvm/libcxx/include/array
+++ b/gnu/llvm/libcxx/include/array
@@ -32,24 +32,24 @@ struct array
     typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
 
     // No explicit construct/copy/destroy for aggregate type
-    void fill(const T& u);
-    void swap(array& a) noexcept(is_nothrow_swappable_v<T>);
+    void fill(const T& u);                                      // constexpr in C++20
+    void swap(array& a) noexcept(is_nothrow_swappable_v<T>);    // constexpr in C++20
 
     // iterators:
-    iterator begin() noexcept;
-    const_iterator begin() const noexcept;
-    iterator end() noexcept;
-    const_iterator end() const noexcept;
+    iterator begin() noexcept;                                  // constexpr in C++17
+    const_iterator begin() const noexcept;                      // constexpr in C++17
+    iterator end() noexcept;                                    // constexpr in C++17
+    const_iterator end() const noexcept;                        // constexpr in C++17
 
-    reverse_iterator rbegin() noexcept;
-    const_reverse_iterator rbegin() const noexcept;
-    reverse_iterator rend() noexcept;
-    const_reverse_iterator rend() const noexcept;
+    reverse_iterator rbegin() noexcept;                         // constexpr in C++17
+    const_reverse_iterator rbegin() const noexcept;             // constexpr in C++17
+    reverse_iterator rend() noexcept;                           // constexpr in C++17
+    const_reverse_iterator rend() const noexcept;               // constexpr in C++17
 
-    const_iterator cbegin() const noexcept;
-    const_iterator cend() const noexcept;
-    const_reverse_iterator crbegin() const noexcept;
-    const_reverse_iterator crend() const noexcept;
+    const_iterator cbegin() const noexcept;                     // constexpr in C++17
+    const_iterator cend() const noexcept;                       // constexpr in C++17
+    const_reverse_iterator crbegin() const noexcept;            // constexpr in C++17
+    const_reverse_iterator crend() const noexcept;              // constexpr in C++17
 
     // capacity:
     constexpr size_type size() const noexcept;
@@ -57,46 +57,51 @@ struct array
     constexpr bool empty() const noexcept;
 
     // element access:
-    reference operator[](size_type n);
-    const_reference operator[](size_type n) const; // constexpr in C++14
-    const_reference at(size_type n) const; // constexpr in C++14
-    reference at(size_type n);
-
-    reference front();
-    const_reference front() const; // constexpr in C++14
-    reference back();
-    const_reference back() const; // constexpr in C++14
-
-    T* data() noexcept;
-    const T* data() const noexcept;
+    reference operator[](size_type n);                          // constexpr in C++17
+    const_reference operator[](size_type n) const;              // constexpr in C++14
+    reference at(size_type n);                                  // constexpr in C++17
+    const_reference at(size_type n) const;                      // constexpr in C++14
+
+    reference front();                                          // constexpr in C++17
+    const_reference front() const;                              // constexpr in C++14
+    reference back();                                           // constexpr in C++17
+    const_reference back() const;                               // constexpr in C++14
+
+    T* data() noexcept;                                         // constexpr in C++17
+    const T* data() const noexcept;                             // constexpr in C++17
 };
 
-  template <class T, class... U>
-    array(T, U...) -> array<T, 1 + sizeof...(U)>;
+template <class T, class... U>
+  array(T, U...) -> array<T, 1 + sizeof...(U)>;                 // C++17
 
 template <class T, size_t N>
-  bool operator==(const array<T,N>& x, const array<T,N>& y);
+  bool operator==(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
 template <class T, size_t N>
-  bool operator!=(const array<T,N>& x, const array<T,N>& y);
+  bool operator!=(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
 template <class T, size_t N>
-  bool operator<(const array<T,N>& x, const array<T,N>& y);
+  bool operator<(const array<T,N>& x, const array<T,N>& y);     // constexpr in C++20
 template <class T, size_t N>
-  bool operator>(const array<T,N>& x, const array<T,N>& y);
+  bool operator>(const array<T,N>& x, const array<T,N>& y);     // constexpr in C++20
 template <class T, size_t N>
-  bool operator<=(const array<T,N>& x, const array<T,N>& y);
+  bool operator<=(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
 template <class T, size_t N>
-  bool operator>=(const array<T,N>& x, const array<T,N>& y);
+  bool operator>=(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
 
 template <class T, size_t N >
-  void swap(array<T,N>& x, array<T,N>& y) noexcept(noexcept(x.swap(y))); // C++17
+  void swap(array<T,N>& x, array<T,N>& y) noexcept(noexcept(x.swap(y))); // constexpr in C++20
+
+template <class T, size_t N>
+  constexpr array<remove_cv_t<T>, N> to_array(T (&a)[N]);  // C++20
+template <class T, size_t N>
+  constexpr array<remove_cv_t<T>, N> to_array(T (&&a)[N]); // C++20
 
 template <class T> struct tuple_size;
 template <size_t I, class T> struct tuple_element;
 template <class T, size_t N> struct tuple_size<array<T, N>>;
 template <size_t I, class T, size_t N> struct tuple_element<I, array<T, N>>;
-template <size_t I, class T, size_t N> T& get(array<T, N>&) noexcept; // constexpr in C++14
-template <size_t I, class T, size_t N> const T& get(const array<T, N>&) noexcept; // constexpr in C++14
-template <size_t I, class T, size_t N> T&& get(array<T, N>&&) noexcept; // constexpr in C++14
+template <size_t I, class T, size_t N> T& get(array<T, N>&) noexcept;               // constexpr in C++14
+template <size_t I, class T, size_t N> const T& get(const array<T, N>&) noexcept;   // constexpr in C++14
+template <size_t I, class T, size_t N> T&& get(array<T, N>&&) noexcept;             // constexpr in C++14
 template <size_t I, class T, size_t N> const T&& get(const array<T, N>&&) noexcept; // constexpr in C++14
 
 }  // std
@@ -143,13 +148,14 @@ struct _LIBCPP_TEMPLATE_VIS array
     _Tp __elems_[_Size];
 
     // No explicit construct/copy/destroy for aggregate type
-    _LIBCPP_INLINE_VISIBILITY void fill(const value_type& __u) {
-      _VSTD::fill_n(__elems_, _Size, __u);
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
+    void fill(const value_type& __u) {
+        _VSTD::fill_n(data(), _Size, __u);
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
     void swap(array& __a) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) {
-      std::swap_ranges(__elems_, __elems_ + _Size, __a.__elems_);
+        std::swap_ranges(data(), data() + _Size, __a.data());
     }
 
     // iterators:
@@ -186,21 +192,38 @@ struct _LIBCPP_TEMPLATE_VIS array
     _LIBCPP_INLINE_VISIBILITY
     _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT {return _Size;}
     _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return false; }
+    _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return _Size == 0;}
 
     // element access:
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
-    reference operator[](size_type __n)             _NOEXCEPT {return __elems_[__n];}
+    reference operator[](size_type __n) _NOEXCEPT {
+        _LIBCPP_ASSERT(__n < _Size, "out-of-bounds access in std::array<T, N>");
+        return __elems_[__n];
+    }
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
-    const_reference operator[](size_type __n) const _NOEXCEPT {return __elems_[__n];}
+    const_reference operator[](size_type __n) const _NOEXCEPT {
+        _LIBCPP_ASSERT(__n < _Size, "out-of-bounds access in std::array<T, N>");
+        return __elems_[__n];
+    }
 
-    _LIBCPP_CONSTEXPR_AFTER_CXX14       reference at(size_type __n);
-    _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference at(size_type __n) const;
+    _LIBCPP_CONSTEXPR_AFTER_CXX14 reference at(size_type __n)
+    {
+        if (__n >= _Size)
+            __throw_out_of_range("array::at");
+        return __elems_[__n];
+    }
 
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference front()             _NOEXCEPT {return __elems_[0];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference front() const _NOEXCEPT {return __elems_[0];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference back()              _NOEXCEPT {return __elems_[_Size - 1];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference back() const  _NOEXCEPT {return __elems_[_Size - 1];}
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference at(size_type __n) const
+    {
+        if (__n >= _Size)
+            __throw_out_of_range("array::at");
+        return __elems_[__n];
+    }
+
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference front()             _NOEXCEPT {return (*this)[0];}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference front() const _NOEXCEPT {return (*this)[0];}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 reference back()              _NOEXCEPT {return (*this)[_Size - 1];}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference back() const  _NOEXCEPT {return (*this)[_Size - 1];}
 
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     value_type* data() _NOEXCEPT {return __elems_;}
@@ -208,28 +231,6 @@ struct _LIBCPP_TEMPLATE_VIS array
     const value_type* data() const _NOEXCEPT {return __elems_;}
 };
 
-
-template <class _Tp, size_t _Size>
-_LIBCPP_CONSTEXPR_AFTER_CXX14
-typename array<_Tp, _Size>::reference
-array<_Tp, _Size>::at(size_type __n)
-{
-    if (__n >= _Size)
-        __throw_out_of_range("array::at");
-
-    return __elems_[__n];
-}
-
-template <class _Tp, size_t _Size>
-_LIBCPP_CONSTEXPR_AFTER_CXX11
-typename array<_Tp, _Size>::const_reference
-array<_Tp, _Size>::at(size_type __n) const
-{
-    if (__n >= _Size)
-        __throw_out_of_range("array::at");
-    return __elems_[__n];
-}
-
 template <class _Tp>
 struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0>
 {
@@ -253,44 +254,50 @@ struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0>
     struct  _ArrayInStructT { _Tp __data_[1]; };
     _ALIGNAS_TYPE(_ArrayInStructT) _CharType __elems_[sizeof(_ArrayInStructT)];
 
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    value_type* data() _NOEXCEPT {return nullptr;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    const value_type* data() const _NOEXCEPT {return nullptr;}
+
     // No explicit construct/copy/destroy for aggregate type
-    _LIBCPP_INLINE_VISIBILITY void fill(const value_type&) {
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
+    void fill(const value_type&) {
       static_assert(!is_const<_Tp>::value,
                     "cannot fill zero-sized array of type 'const T'");
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
     void swap(array&) _NOEXCEPT {
       static_assert(!is_const<_Tp>::value,
                     "cannot swap zero-sized array of type 'const T'");
     }
 
     // iterators:
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     iterator begin() _NOEXCEPT {return iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_iterator begin() const _NOEXCEPT {return const_iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     iterator end() _NOEXCEPT {return iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_iterator end() const _NOEXCEPT {return const_iterator(data());}
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_reverse_iterator rbegin() const _NOEXCEPT {return const_reverse_iterator(end());}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_reverse_iterator rend() const _NOEXCEPT {return const_reverse_iterator(begin());}
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_iterator cbegin() const _NOEXCEPT {return begin();}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_iterator cend() const _NOEXCEPT {return end();}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     const_reverse_iterator crend() const _NOEXCEPT {return rend();}
 
     // capacity:
@@ -302,7 +309,7 @@ struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0>
     _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return true;}
 
     // element access:
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     reference operator[](size_type) _NOEXCEPT {
       _LIBCPP_ASSERT(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
       _LIBCPP_UNREACHABLE();
@@ -314,46 +321,41 @@ struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0>
       _LIBCPP_UNREACHABLE();
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     reference at(size_type) {
       __throw_out_of_range("array<T, 0>::at");
       _LIBCPP_UNREACHABLE();
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     const_reference at(size_type) const {
       __throw_out_of_range("array<T, 0>::at");
       _LIBCPP_UNREACHABLE();
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     reference front() _NOEXCEPT {
       _LIBCPP_ASSERT(false, "cannot call array<T, 0>::front() on a zero-sized array");
       _LIBCPP_UNREACHABLE();
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     const_reference front() const _NOEXCEPT {
       _LIBCPP_ASSERT(false, "cannot call array<T, 0>::front() on a zero-sized array");
       _LIBCPP_UNREACHABLE();
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
     reference back() _NOEXCEPT {
       _LIBCPP_ASSERT(false, "cannot call array<T, 0>::back() on a zero-sized array");
       _LIBCPP_UNREACHABLE();
     }
 
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     const_reference back() const _NOEXCEPT {
       _LIBCPP_ASSERT(false, "cannot call array<T, 0>::back() on a zero-sized array");
       _LIBCPP_UNREACHABLE();
     }
-
-    _LIBCPP_INLINE_VISIBILITY
-    value_type* data() _NOEXCEPT {return reinterpret_cast<value_type*>(__elems_);}
-    _LIBCPP_INLINE_VISIBILITY
-    const value_type* data() const _NOEXCEPT {return reinterpret_cast<const value_type*>(__elems_);}
 };
 
 
@@ -415,7 +417,7 @@ operator>=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }
 
 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
 typename enable_if
 <
     _Size == 0 ||
@@ -479,6 +481,47 @@ get(const array<_Tp, _Size>&& __a) _NOEXCEPT
 
 #endif  // !_LIBCPP_CXX03_LANG
 
+#if _LIBCPP_STD_VER > 17
+
+template <typename _Tp, size_t _Size, size_t... _Index>
+_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
+__to_array_lvalue_impl(_Tp (&__arr)[_Size], index_sequence<_Index...>) {
+  return {{__arr[_Index]...}};
+}
+
+template <typename _Tp, size_t _Size, size_t... _Index>
+_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
+__to_array_rvalue_impl(_Tp(&&__arr)[_Size], index_sequence<_Index...>) {
+  return {{_VSTD::move(__arr[_Index])...}};
+}
+
+template <typename _Tp, size_t _Size>
+_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
+to_array(_Tp (&__arr)[_Size]) noexcept(is_nothrow_constructible_v<_Tp, _Tp&>) {
+  static_assert(
+      !is_array_v<_Tp>,
+      "[array.creation]/1: to_array does not accept multidimensional arrays.");
+  static_assert(
+      is_constructible_v<_Tp, _Tp&>,
+      "[array.creation]/1: to_array requires copy constructible elements.");
+  return __to_array_lvalue_impl(__arr, make_index_sequence<_Size>());
+}
+
+template <typename _Tp, size_t _Size>
+_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
+to_array(_Tp(&&__arr)[_Size]) noexcept(is_nothrow_move_constructible_v<_Tp>) {
+  static_assert(
+      !is_array_v<_Tp>,
+      "[array.creation]/4: to_array does not accept multidimensional arrays.");
+  static_assert(
+      is_move_constructible_v<_Tp>,
+      "[array.creation]/4: to_array requires move constructible elements.");
+  return __to_array_rvalue_impl(_VSTD::move(__arr),
+                                make_index_sequence<_Size>());
+}
+
+#endif // _LIBCPP_STD_VER > 17
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif  // _LIBCPP_ARRAY
diff --git a/gnu/llvm/libcxx/include/atomic b/gnu/llvm/libcxx/include/atomic
index 6904dd40003..9c289865378 100644
--- a/gnu/llvm/libcxx/include/atomic
+++ b/gnu/llvm/libcxx/include/atomic
@@ -54,60 +54,30 @@ template <class T> T kill_dependency(T y) noexcept;
 #define ATOMIC_LLONG_LOCK_FREE unspecified
 #define ATOMIC_POINTER_LOCK_FREE unspecified
 
-// flag type and operations
-
-typedef struct atomic_flag
-{
-    bool test_and_set(memory_order m = memory_order_seq_cst) volatile noexcept;
-    bool test_and_set(memory_order m = memory_order_seq_cst) noexcept;
-    void clear(memory_order m = memory_order_seq_cst) volatile noexcept;
-    void clear(memory_order m = memory_order_seq_cst) noexcept;
-    atomic_flag()  noexcept = default;
-    atomic_flag(const atomic_flag&) = delete;
-    atomic_flag& operator=(const atomic_flag&) = delete;
-    atomic_flag& operator=(const atomic_flag&) volatile = delete;
-} atomic_flag;
-
-bool
-    atomic_flag_test_and_set(volatile atomic_flag* obj) noexcept;
-
-bool
-    atomic_flag_test_and_set(atomic_flag* obj) noexcept;
-
-bool
-    atomic_flag_test_and_set_explicit(volatile atomic_flag* obj,
-                                      memory_order m) noexcept;
-
-bool
-    atomic_flag_test_and_set_explicit(atomic_flag* obj, memory_order m) noexcept;
-
-void
-    atomic_flag_clear(volatile atomic_flag* obj) noexcept;
-
-void
-    atomic_flag_clear(atomic_flag* obj) noexcept;
-
-void
-    atomic_flag_clear_explicit(volatile atomic_flag* obj, memory_order m) noexcept;
-
-void
-    atomic_flag_clear_explicit(atomic_flag* obj, memory_order m) noexcept;
-
-#define ATOMIC_FLAG_INIT see below
-#define ATOMIC_VAR_INIT(value) see below
-
 template <class T>
 struct atomic
 {
+    using value_type = T;
+
     static constexpr bool is_always_lock_free;
     bool is_lock_free() const volatile noexcept;
     bool is_lock_free() const noexcept;
-    void store(T desr, memory_order m = memory_order_seq_cst) volatile noexcept;
-    void store(T desr, memory_order m = memory_order_seq_cst) noexcept;
+
+    atomic() noexcept = default;
+    constexpr atomic(T desr) noexcept;
+    atomic(const atomic&) = delete;
+    atomic& operator=(const atomic&) = delete;
+    atomic& operator=(const atomic&) volatile = delete;
+
     T load(memory_order m = memory_order_seq_cst) const volatile noexcept;
     T load(memory_order m = memory_order_seq_cst) const noexcept;
     operator T() const volatile noexcept;
     operator T() const noexcept;
+    void store(T desr, memory_order m = memory_order_seq_cst) volatile noexcept;
+    void store(T desr, memory_order m = memory_order_seq_cst) noexcept;
+    T operator=(T) volatile noexcept;
+    T operator=(T) noexcept;
+
     T exchange(T desr, memory_order m = memory_order_seq_cst) volatile noexcept;
     T exchange(T desr, memory_order m = memory_order_seq_cst) noexcept;
     bool compare_exchange_weak(T& expc, T desr,
@@ -126,27 +96,38 @@ struct atomic
     bool compare_exchange_strong(T& expc, T desr,
                                  memory_order m = memory_order_seq_cst) noexcept;
 
-    atomic() noexcept = default;
-    constexpr atomic(T desr) noexcept;
-    atomic(const atomic&) = delete;
-    atomic& operator=(const atomic&) = delete;
-    atomic& operator=(const atomic&) volatile = delete;
-    T operator=(T) volatile noexcept;
-    T operator=(T) noexcept;
+    void wait(T, memory_order = memory_order::seq_cst) const volatile noexcept;
+    void wait(T, memory_order = memory_order::seq_cst) const noexcept;
+    void notify_one() volatile noexcept;
+    void notify_one() noexcept;
+    void notify_all() volatile noexcept;
+    void notify_all() noexcept;
 };
 
 template <>
 struct atomic<integral>
 {
+    using value_type = integral;
+
     static constexpr bool is_always_lock_free;
     bool is_lock_free() const volatile noexcept;
     bool is_lock_free() const noexcept;
-    void store(integral desr, memory_order m = memory_order_seq_cst) volatile noexcept;
-    void store(integral desr, memory_order m = memory_order_seq_cst) noexcept;
+
+    atomic() noexcept = default;
+    constexpr atomic(integral desr) noexcept;
+    atomic(const atomic&) = delete;
+    atomic& operator=(const atomic&) = delete;
+    atomic& operator=(const atomic&) volatile = delete;
+
     integral load(memory_order m = memory_order_seq_cst) const volatile noexcept;
     integral load(memory_order m = memory_order_seq_cst) const noexcept;
     operator integral() const volatile noexcept;
     operator integral() const noexcept;
+    void store(integral desr, memory_order m = memory_order_seq_cst) volatile noexcept;
+    void store(integral desr, memory_order m = memory_order_seq_cst) noexcept;
+    integral operator=(integral desr) volatile noexcept;
+    integral operator=(integral desr) noexcept;
+
     integral exchange(integral desr,
                       memory_order m = memory_order_seq_cst) volatile noexcept;
     integral exchange(integral desr, memory_order m = memory_order_seq_cst) noexcept;
@@ -167,30 +148,17 @@ struct atomic<integral>
     bool compare_exchange_strong(integral& expc, integral desr,
                                  memory_order m = memory_order_seq_cst) noexcept;
 
-    integral
-        fetch_add(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
+    integral fetch_add(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
     integral fetch_add(integral op, memory_order m = memory_order_seq_cst) noexcept;
-    integral
-        fetch_sub(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
+    integral fetch_sub(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
     integral fetch_sub(integral op, memory_order m = memory_order_seq_cst) noexcept;
-    integral
-        fetch_and(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
+    integral fetch_and(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
     integral fetch_and(integral op, memory_order m = memory_order_seq_cst) noexcept;
-    integral
-        fetch_or(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
+    integral fetch_or(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
     integral fetch_or(integral op, memory_order m = memory_order_seq_cst) noexcept;
-    integral
-        fetch_xor(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
+    integral fetch_xor(integral op, memory_order m = memory_order_seq_cst) volatile noexcept;
     integral fetch_xor(integral op, memory_order m = memory_order_seq_cst) noexcept;
 
-    atomic() noexcept = default;
-    constexpr atomic(integral desr) noexcept;
-    atomic(const atomic&) = delete;
-    atomic& operator=(const atomic&) = delete;
-    atomic& operator=(const atomic&) volatile = delete;
-    integral operator=(integral desr) volatile noexcept;
-    integral operator=(integral desr) noexcept;
-
     integral operator++(int) volatile noexcept;
     integral operator++(int) noexcept;
     integral operator--(int) volatile noexcept;
@@ -209,20 +177,39 @@ struct atomic<integral>
     integral operator|=(integral op) noexcept;
     integral operator^=(integral op) volatile noexcept;
     integral operator^=(integral op) noexcept;
+
+    void wait(integral, memory_order = memory_order::seq_cst) const volatile noexcept;
+    void wait(integral, memory_order = memory_order::seq_cst) const noexcept;
+    void notify_one() volatile noexcept;
+    void notify_one() noexcept;
+    void notify_all() volatile noexcept;
+    void notify_all() noexcept;
 };
 
 template <class T>
 struct atomic<T*>
 {
+    using value_type = T*;
+
     static constexpr bool is_always_lock_free;
     bool is_lock_free() const volatile noexcept;
     bool is_lock_free() const noexcept;
-    void store(T* desr, memory_order m = memory_order_seq_cst) volatile noexcept;
-    void store(T* desr, memory_order m = memory_order_seq_cst) noexcept;
+
+    atomic() noexcept = default;
+    constexpr atomic(T* desr) noexcept;
+    atomic(const atomic&) = delete;
+    atomic& operator=(const atomic&) = delete;
+    atomic& operator=(const atomic&) volatile = delete;
+
     T* load(memory_order m = memory_order_seq_cst) const volatile noexcept;
     T* load(memory_order m = memory_order_seq_cst) const noexcept;
     operator T*() const volatile noexcept;
     operator T*() const noexcept;
+    void store(T* desr, memory_order m = memory_order_seq_cst) volatile noexcept;
+    void store(T* desr, memory_order m = memory_order_seq_cst) noexcept;
+    T* operator=(T*) volatile noexcept;
+    T* operator=(T*) noexcept;
+
     T* exchange(T* desr, memory_order m = memory_order_seq_cst) volatile noexcept;
     T* exchange(T* desr, memory_order m = memory_order_seq_cst) noexcept;
     bool compare_exchange_weak(T*& expc, T* desr,
@@ -246,14 +233,6 @@ struct atomic<T*>
     T* fetch_sub(ptrdiff_t op, memory_order m = memory_order_seq_cst) volatile noexcept;
     T* fetch_sub(ptrdiff_t op, memory_order m = memory_order_seq_cst) noexcept;
 
-    atomic() noexcept = default;
-    constexpr atomic(T* desr) noexcept;
-    atomic(const atomic&) = delete;
-    atomic& operator=(const atomic&) = delete;
-    atomic& operator=(const atomic&) volatile = delete;
-
-    T* operator=(T*) volatile noexcept;
-    T* operator=(T*) noexcept;
     T* operator++(int) volatile noexcept;
     T* operator++(int) noexcept;
     T* operator--(int) volatile noexcept;
@@ -266,224 +245,206 @@ struct atomic<T*>
     T* operator+=(ptrdiff_t op) noexcept;
     T* operator-=(ptrdiff_t op) volatile noexcept;
     T* operator-=(ptrdiff_t op) noexcept;
+
+    void wait(T*, memory_order = memory_order::seq_cst) const volatile noexcept;
+    void wait(T*, memory_order = memory_order::seq_cst) const noexcept;
+    void notify_one() volatile noexcept;
+    void notify_one() noexcept;
+    void notify_all() volatile noexcept;
+    void notify_all() noexcept;
 };
 
 
 template <class T>
-    bool
-    atomic_is_lock_free(const volatile atomic<T>* obj) noexcept;
+  bool atomic_is_lock_free(const volatile atomic<T>* obj) noexcept;
+
+template <class T>
+  bool atomic_is_lock_free(const atomic<T>* obj) noexcept;
+
+template <class T>
+  void atomic_store(volatile atomic<T>* obj, T desr) noexcept;
+
+template <class T>
+  void atomic_store(atomic<T>* obj, T desr) noexcept;
+
+template <class T>
+  void atomic_store_explicit(volatile atomic<T>* obj, T desr, memory_order m) noexcept;
+
+template <class T>
+  void atomic_store_explicit(atomic<T>* obj, T desr, memory_order m) noexcept;
+
+template <class T>
+  T atomic_load(const volatile atomic<T>* obj) noexcept;
 
 template <class T>
-    bool
-    atomic_is_lock_free(const atomic<T>* obj) noexcept;
+  T atomic_load(const atomic<T>* obj) noexcept;
 
 template <class T>
-    void
-    atomic_init(volatile atomic<T>* obj, T desr) noexcept;
+  T atomic_load_explicit(const volatile atomic<T>* obj, memory_order m) noexcept;
 
 template <class T>
-    void
-    atomic_init(atomic<T>* obj, T desr) noexcept;
+  T atomic_load_explicit(const atomic<T>* obj, memory_order m) noexcept;
 
 template <class T>
-    void
-    atomic_store(volatile atomic<T>* obj, T desr) noexcept;
+  T atomic_exchange(volatile atomic<T>* obj, T desr) noexcept;
 
 template <class T>
-    void
-    atomic_store(atomic<T>* obj, T desr) noexcept;
+  T atomic_exchange(atomic<T>* obj, T desr) noexcept;
 
 template <class T>
-    void
-    atomic_store_explicit(volatile atomic<T>* obj, T desr, memory_order m) noexcept;
+  T atomic_exchange_explicit(volatile atomic<T>* obj, T desr, memory_order m) noexcept;
 
 template <class T>
-    void
-    atomic_store_explicit(atomic<T>* obj, T desr, memory_order m) noexcept;
+  T atomic_exchange_explicit(atomic<T>* obj, T desr, memory_order m) noexcept;
 
 template <class T>
-    T
-    atomic_load(const volatile atomic<T>* obj) noexcept;
+  bool atomic_compare_exchange_weak(volatile atomic<T>* obj, T* expc, T desr) noexcept;
 
 template <class T>
-    T
-    atomic_load(const atomic<T>* obj) noexcept;
+  bool atomic_compare_exchange_weak(atomic<T>* obj, T* expc, T desr) noexcept;
 
 template <class T>
-    T
-    atomic_load_explicit(const volatile atomic<T>* obj, memory_order m) noexcept;
+  bool atomic_compare_exchange_strong(volatile atomic<T>* obj, T* expc, T desr) noexcept;
 
 template <class T>
-    T
-    atomic_load_explicit(const atomic<T>* obj, memory_order m) noexcept;
+  bool atomic_compare_exchange_strong(atomic<T>* obj, T* expc, T desr) noexcept;
 
 template <class T>
-    T
-    atomic_exchange(volatile atomic<T>* obj, T desr) noexcept;
+  bool atomic_compare_exchange_weak_explicit(volatile atomic<T>* obj, T* expc,
+                                             T desr,
+                                             memory_order s, memory_order f) noexcept;
 
 template <class T>
-    T
-    atomic_exchange(atomic<T>* obj, T desr) noexcept;
+  bool atomic_compare_exchange_weak_explicit(atomic<T>* obj, T* expc, T desr,
+                                             memory_order s, memory_order f) noexcept;
 
 template <class T>
-    T
-    atomic_exchange_explicit(volatile atomic<T>* obj, T desr, memory_order m) noexcept;
+  bool atomic_compare_exchange_strong_explicit(volatile atomic<T>* obj,
+                                               T* expc, T desr,
+                                               memory_order s, memory_order f) noexcept;
 
 template <class T>
-    T
-    atomic_exchange_explicit(atomic<T>* obj, T desr, memory_order m) noexcept;
+  bool atomic_compare_exchange_strong_explicit(atomic<T>* obj, T* expc,
+                                               T desr,
+                                               memory_order s, memory_order f) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_weak(volatile atomic<T>* obj, T* expc, T desr) noexcept;
+  void atomic_wait(const volatile atomic<T>* obj, T old) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_weak(atomic<T>* obj, T* expc, T desr) noexcept;
+  void atomic_wait(const atomic<T>* obj, T old) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_strong(volatile atomic<T>* obj, T* expc, T desr) noexcept;
+  void atomic_wait_explicit(const volatile atomic<T>* obj, T old, memory_order m) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_strong(atomic<T>* obj, T* expc, T desr) noexcept;
+  void atomic_wait_explicit(const atomic<T>* obj, T old, memory_order m) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_weak_explicit(volatile atomic<T>* obj, T* expc,
-                                          T desr,
-                                          memory_order s, memory_order f) noexcept;
+  void atomic_one(volatile atomic<T>* obj) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_weak_explicit(atomic<T>* obj, T* expc, T desr,
-                                          memory_order s, memory_order f) noexcept;
+  void atomic_one(atomic<T>* obj) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_strong_explicit(volatile atomic<T>* obj,
-                                            T* expc, T desr,
-                                            memory_order s, memory_order f) noexcept;
+  void atomic_all(volatile atomic<T>* obj) noexcept;
 
 template <class T>
-    bool
-    atomic_compare_exchange_strong_explicit(atomic<T>* obj, T* expc,
-                                            T desr,
-                                            memory_order s, memory_order f) noexcept;
+  void atomic_all(atomic<T>* obj) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_add(volatile atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_add(volatile atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_add(atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_add(atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_add_explicit(volatile atomic<Integral>* obj, Integral op,
+  Integral atomic_fetch_add_explicit(volatile atomic<Integral>* obj, Integral op,
                               memory_order m) noexcept;
 template <class Integral>
-    Integral
-    atomic_fetch_add_explicit(atomic<Integral>* obj, Integral op,
+  Integral atomic_fetch_add_explicit(atomic<Integral>* obj, Integral op,
                               memory_order m) noexcept;
 template <class Integral>
-    Integral
-    atomic_fetch_sub(volatile atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_sub(volatile atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_sub(atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_sub(atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_sub_explicit(volatile atomic<Integral>* obj, Integral op,
-                              memory_order m) noexcept;
+  Integral atomic_fetch_sub_explicit(volatile atomic<Integral>* obj, Integral op,
+                                     memory_order m) noexcept;
+
 template <class Integral>
-    Integral
-    atomic_fetch_sub_explicit(atomic<Integral>* obj, Integral op,
-                              memory_order m) noexcept;
+  Integral atomic_fetch_sub_explicit(atomic<Integral>* obj, Integral op,
+                                     memory_order m) noexcept;
+
 template <class Integral>
-    Integral
-    atomic_fetch_and(volatile atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_and(volatile atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_and(atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_and(atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_and_explicit(volatile atomic<Integral>* obj, Integral op,
-                              memory_order m) noexcept;
+  Integral atomic_fetch_and_explicit(volatile atomic<Integral>* obj, Integral op,
+                                     memory_order m) noexcept;
+
 template <class Integral>
-    Integral
-    atomic_fetch_and_explicit(atomic<Integral>* obj, Integral op,
-                              memory_order m) noexcept;
+  Integral atomic_fetch_and_explicit(atomic<Integral>* obj, Integral op,
+                                     memory_order m) noexcept;
+
 template <class Integral>
-    Integral
-    atomic_fetch_or(volatile atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_or(volatile atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_or(atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_or(atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_or_explicit(volatile atomic<Integral>* obj, Integral op,
+  Integral atomic_fetch_or_explicit(volatile atomic<Integral>* obj, Integral op,
                              memory_order m) noexcept;
+
 template <class Integral>
-    Integral
-    atomic_fetch_or_explicit(atomic<Integral>* obj, Integral op,
+  Integral atomic_fetch_or_explicit(atomic<Integral>* obj, Integral op,
                              memory_order m) noexcept;
+
 template <class Integral>
-    Integral
-    atomic_fetch_xor(volatile atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_xor(volatile atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_xor(atomic<Integral>* obj, Integral op) noexcept;
+  Integral atomic_fetch_xor(atomic<Integral>* obj, Integral op) noexcept;
 
 template <class Integral>
-    Integral
-    atomic_fetch_xor_explicit(volatile atomic<Integral>* obj, Integral op,
-                              memory_order m) noexcept;
+  Integral atomic_fetch_xor_explicit(volatile atomic<Integral>* obj, Integral op,
+                                     memory_order m) noexcept;
+
 template <class Integral>
-    Integral
-    atomic_fetch_xor_explicit(atomic<Integral>* obj, Integral op,
-                              memory_order m) noexcept;
+  Integral atomic_fetch_xor_explicit(atomic<Integral>* obj, Integral op,
+                                     memory_order m) noexcept;
 
 template <class T>
-    T*
-    atomic_fetch_add(volatile atomic<T*>* obj, ptrdiff_t op) noexcept;
+  T* atomic_fetch_add(volatile atomic<T*>* obj, ptrdiff_t op) noexcept;
 
 template <class T>
-    T*
-    atomic_fetch_add(atomic<T*>* obj, ptrdiff_t op) noexcept;
+  T* atomic_fetch_add(atomic<T*>* obj, ptrdiff_t op) noexcept;
 
 template <class T>
-    T*
-    atomic_fetch_add_explicit(volatile atomic<T*>* obj, ptrdiff_t op,
-                              memory_order m) noexcept;
+  T* atomic_fetch_add_explicit(volatile atomic<T*>* obj, ptrdiff_t op,
+                               memory_order m) noexcept;
+
 template <class T>
-    T*
-    atomic_fetch_add_explicit(atomic<T*>* obj, ptrdiff_t op, memory_order m) noexcept;
+  T* atomic_fetch_add_explicit(atomic<T*>* obj, ptrdiff_t op, memory_order m) noexcept;
 
 template <class T>
-    T*
-    atomic_fetch_sub(volatile atomic<T*>* obj, ptrdiff_t op) noexcept;
+  T* atomic_fetch_sub(volatile atomic<T*>* obj, ptrdiff_t op) noexcept;
 
 template <class T>
-    T*
-    atomic_fetch_sub(atomic<T*>* obj, ptrdiff_t op) noexcept;
+  T* atomic_fetch_sub(atomic<T*>* obj, ptrdiff_t op) noexcept;
 
 template <class T>
-    T*
-    atomic_fetch_sub_explicit(volatile atomic<T*>* obj, ptrdiff_t op,
-                              memory_order m) noexcept;
+  T* atomic_fetch_sub_explicit(volatile atomic<T*>* obj, ptrdiff_t op,
+                               memory_order m) noexcept;
+
 template <class T>
-    T*
-    atomic_fetch_sub_explicit(atomic<T*>* obj, ptrdiff_t op, memory_order m) noexcept;
+  T* atomic_fetch_sub_explicit(atomic<T*>* obj, ptrdiff_t op, memory_order m) noexcept;
 
 // Atomics for standard typedef types
 
@@ -516,7 +477,7 @@ typedef atomic<int_fast8_t>   atomic_int_fast8_t;
 typedef atomic<uint_fast8_t>  atomic_uint_fast8_t;
 typedef atomic<int_fast16_t>  atomic_int_fast16_t;
 typedef atomic<uint_fast16_t> atomic_uint_fast16_t;
-typedef atomic<int_fast32_t>  atomic_int_fast32_t;
+typedef atomic<int_fast32_t>  atomic_int_fast32_t;    
 typedef atomic<uint_fast32_t> atomic_uint_fast32_t;
 typedef atomic<int_fast64_t>  atomic_int_fast64_t;
 typedef atomic<uint_fast64_t> atomic_uint_fast64_t;
@@ -537,18 +498,80 @@ typedef atomic<ptrdiff_t> atomic_ptrdiff_t;
 typedef atomic<intmax_t>  atomic_intmax_t;
 typedef atomic<uintmax_t> atomic_uintmax_t;
 
+// flag type and operations
+
+typedef struct atomic_flag
+{
+    atomic_flag() noexcept = default;
+    atomic_flag(const atomic_flag&) = delete;
+    atomic_flag& operator=(const atomic_flag&) = delete;
+    atomic_flag& operator=(const atomic_flag&) volatile = delete;
+
+    bool test(memory_order m = memory_order_seq_cst) volatile noexcept;
+    bool test(memory_order m = memory_order_seq_cst) noexcept;
+    bool test_and_set(memory_order m = memory_order_seq_cst) volatile noexcept;
+    bool test_and_set(memory_order m = memory_order_seq_cst) noexcept;
+    void clear(memory_order m = memory_order_seq_cst) volatile noexcept;
+    void clear(memory_order m = memory_order_seq_cst) noexcept;
+
+    void wait(bool, memory_order = memory_order::seq_cst) const volatile noexcept;
+    void wait(bool, memory_order = memory_order::seq_cst) const noexcept;
+    void notify_one() volatile noexcept;
+    void notify_one() noexcept;
+    void notify_all() volatile noexcept;
+    void notify_all() noexcept;
+} atomic_flag;
+
+bool atomic_flag_test(volatile atomic_flag* obj) noexcept;
+bool atomic_flag_test(atomic_flag* obj) noexcept;
+bool atomic_flag_test_explicit(volatile atomic_flag* obj,
+                               memory_order m) noexcept;
+bool atomic_flag_test_explicit(atomic_flag* obj, memory_order m) noexcept;
+bool atomic_flag_test_and_set(volatile atomic_flag* obj) noexcept;
+bool atomic_flag_test_and_set(atomic_flag* obj) noexcept;
+bool atomic_flag_test_and_set_explicit(volatile atomic_flag* obj,
+                                       memory_order m) noexcept;
+bool atomic_flag_test_and_set_explicit(atomic_flag* obj, memory_order m) noexcept;
+void atomic_flag_clear(volatile atomic_flag* obj) noexcept;
+void atomic_flag_clear(atomic_flag* obj) noexcept;
+void atomic_flag_clear_explicit(volatile atomic_flag* obj, memory_order m) noexcept;
+void atomic_flag_clear_explicit(atomic_flag* obj, memory_order m) noexcept;
+
+void atomic_wait(const volatile atomic_flag* obj, T old) noexcept;
+void atomic_wait(const atomic_flag* obj, T old) noexcept;
+void atomic_wait_explicit(const volatile atomic_flag* obj, T old, memory_order m) noexcept;
+void atomic_wait_explicit(const atomic_flag* obj, T old, memory_order m) noexcept;
+void atomic_one(volatile atomic_flag* obj) noexcept;
+void atomic_one(atomic_flag* obj) noexcept;
+void atomic_all(volatile atomic_flag* obj) noexcept;
+void atomic_all(atomic_flag* obj) noexcept;
+
 // fences
 
 void atomic_thread_fence(memory_order m) noexcept;
 void atomic_signal_fence(memory_order m) noexcept;
 
+// deprecated
+
+template <class T>
+  void atomic_init(volatile atomic<T>* obj, typename atomic<T>::value_type desr) noexcept;
+
+template <class T>
+  void atomic_init(atomic<T>* obj, typename atomic<T>::value_type desr) noexcept;
+
+#define ATOMIC_VAR_INIT(value) see below
+
+#define ATOMIC_FLAG_INIT see below
+
 }  // std
 
 */
 
 #include <__config>
+#include <__threading_support>
 #include <cstddef>
 #include <cstdint>
+#include <cstring>
 #include <type_traits>
 #include <version>
 
@@ -629,6 +652,11 @@ typedef enum memory_order {
 
 #endif // _LIBCPP_STD_VER > 17
 
+template <typename _Tp> _LIBCPP_INLINE_VISIBILITY
+bool __cxx_nonatomic_compare_equal(_Tp const& __lhs, _Tp const& __rhs) {
+    return memcmp(&__lhs, &__rhs, sizeof(_Tp)) == 0;
+}
+
 static_assert((is_same<underlying_type<memory_order>::type, __memory_order_underlying_t>::value),
   "unexpected underlying type for std::memory_order");
 
@@ -1218,9 +1246,9 @@ _LIBCPP_INLINE_VISIBILITY
 bool __cxx_atomic_compare_exchange_strong(volatile __cxx_atomic_lock_impl<_Tp>* __a,
                                           _Tp* __expected, _Tp __value, memory_order, memory_order) {
   __a->__lock();
-  _Tp temp;
-  __cxx_atomic_assign_volatile(temp, __a->__a_value);
-  bool __ret = temp == *__expected;
+  _Tp __temp;
+  __cxx_atomic_assign_volatile(__temp, __a->__a_value);
+  bool __ret = __temp == *__expected;
   if(__ret)
     __cxx_atomic_assign_volatile(__a->__a_value, __value);
   else
@@ -1247,9 +1275,9 @@ _LIBCPP_INLINE_VISIBILITY
 bool __cxx_atomic_compare_exchange_weak(volatile __cxx_atomic_lock_impl<_Tp>* __a,
                                         _Tp* __expected, _Tp __value, memory_order, memory_order) {
   __a->__lock();
-  _Tp temp;
-  __cxx_atomic_assign_volatile(temp, __a->__a_value);
-  bool __ret = temp == *__expected;
+  _Tp __temp;
+  __cxx_atomic_assign_volatile(__temp, __a->__a_value);
+  bool __ret = __temp == *__expected;
   if(__ret)
     __cxx_atomic_assign_volatile(__a->__a_value, __value);
   else
@@ -1452,6 +1480,93 @@ struct __cxx_atomic_impl : public _Base {
     : _Base(value) {}
 };
 
+#ifdef __linux__
+    using __cxx_contention_t = int32_t;
+#else
+    using __cxx_contention_t = int64_t;
+#endif //__linux__
+
+#if _LIBCPP_STD_VER >= 11
+
+using __cxx_atomic_contention_t = __cxx_atomic_impl<__cxx_contention_t>;
+
+#ifndef _LIBCPP_HAS_NO_PLATFORM_WAIT
+
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(void const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(void const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(void const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(void const volatile*, __cxx_contention_t);
+
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(__cxx_atomic_contention_t const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(__cxx_atomic_contention_t const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(__cxx_atomic_contention_t const volatile*);
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(__cxx_atomic_contention_t const volatile*, __cxx_contention_t);
+
+template <class _Atp, class _Fn>
+struct __libcpp_atomic_wait_backoff_impl {
+    _Atp* __a;
+    _Fn __test_fn;
+    _LIBCPP_AVAILABILITY_SYNC
+    _LIBCPP_INLINE_VISIBILITY bool operator()(chrono::nanoseconds __elapsed) const
+    {
+        if(__elapsed > chrono::microseconds(64))
+        {
+            auto const __monitor = __libcpp_atomic_monitor(__a);
+            if(__test_fn())
+                return true;
+            __libcpp_atomic_wait(__a, __monitor);
+        }
+        else if(__elapsed > chrono::microseconds(4))
+            __libcpp_thread_yield();
+        else
+            ; // poll
+        return false;
+    }
+};
+
+template <class _Atp, class _Fn>
+_LIBCPP_AVAILABILITY_SYNC
+_LIBCPP_INLINE_VISIBILITY bool __cxx_atomic_wait(_Atp* __a, _Fn && __test_fn)
+{
+    __libcpp_atomic_wait_backoff_impl<_Atp, typename decay<_Fn>::type> __backoff_fn = {__a, __test_fn};
+    return __libcpp_thread_poll_with_backoff(__test_fn, __backoff_fn);
+}
+
+#else // _LIBCPP_HAS_NO_PLATFORM_WAIT
+
+template <class _Tp>
+_LIBCPP_INLINE_VISIBILITY void __cxx_atomic_notify_all(__cxx_atomic_impl<_Tp> const volatile*) { }
+template <class _Tp>
+_LIBCPP_INLINE_VISIBILITY void __cxx_atomic_notify_one(__cxx_atomic_impl<_Tp> const volatile*) { }
+template <class _Atp, class _Fn>
+_LIBCPP_INLINE_VISIBILITY bool __cxx_atomic_wait(_Atp*, _Fn && __test_fn)
+{
+    return __libcpp_thread_poll_with_backoff(__test_fn, __libcpp_timed_backoff_policy());
+}
+
+#endif // _LIBCPP_HAS_NO_PLATFORM_WAIT
+
+template <class _Atp, class _Tp>
+struct __cxx_atomic_wait_test_fn_impl {
+    _Atp* __a;
+    _Tp __val;
+    memory_order __order;
+    _LIBCPP_INLINE_VISIBILITY bool operator()() const
+    {
+        return !__cxx_nonatomic_compare_equal(__cxx_atomic_load(__a, __order), __val);
+    }
+};
+
+template <class _Atp, class _Tp>
+_LIBCPP_AVAILABILITY_SYNC
+_LIBCPP_INLINE_VISIBILITY bool __cxx_atomic_wait(_Atp* __a, _Tp const __val, memory_order __order)
+{
+    __cxx_atomic_wait_test_fn_impl<_Atp, _Tp> __test_fn = {__a, __val, __order};
+    return __cxx_atomic_wait(__a, __test_fn);
+}
+
+#endif //_LIBCPP_STD_VER >= 11
+
 // general atomic<T>
 
 template <class _Tp, bool = is_integral<_Tp>::value && !is_same<_Tp, bool>::value>
@@ -1532,6 +1647,19 @@ struct __atomic_base  // false
                                  memory_order __m = memory_order_seq_cst) _NOEXCEPT
         {return __cxx_atomic_compare_exchange_strong(&__a_, &__e, __d, __m, __m);}
 
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void wait(_Tp __v, memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
+        {__cxx_atomic_wait(&__a_, __v, __m);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void wait(_Tp __v, memory_order __m = memory_order_seq_cst) const _NOEXCEPT
+        {__cxx_atomic_wait(&__a_, __v, __m);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_one() volatile _NOEXCEPT
+        {__cxx_atomic_notify_one(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_one() _NOEXCEPT
+        {__cxx_atomic_notify_one(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_all() volatile _NOEXCEPT
+        {__cxx_atomic_notify_all(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY void notify_all() _NOEXCEPT
+        {__cxx_atomic_notify_all(&__a_);}
+
     _LIBCPP_INLINE_VISIBILITY
     __atomic_base() _NOEXCEPT _LIBCPP_DEFAULT
 
@@ -1544,8 +1672,11 @@ struct __atomic_base  // false
     __atomic_base& operator=(const __atomic_base&) volatile = delete;
 #else
 private:
+    _LIBCPP_INLINE_VISIBILITY
     __atomic_base(const __atomic_base&);
+    _LIBCPP_INLINE_VISIBILITY
     __atomic_base& operator=(const __atomic_base&);
+    _LIBCPP_INLINE_VISIBILITY
     __atomic_base& operator=(const __atomic_base&) volatile;
 #endif
 };
@@ -1643,6 +1774,7 @@ struct atomic
     : public __atomic_base<_Tp>
 {
     typedef __atomic_base<_Tp> __base;
+    typedef _Tp value_type;
     _LIBCPP_INLINE_VISIBILITY
     atomic() _NOEXCEPT _LIBCPP_DEFAULT
     _LIBCPP_INLINE_VISIBILITY
@@ -1663,6 +1795,7 @@ struct atomic<_Tp*>
     : public __atomic_base<_Tp*>
 {
     typedef __atomic_base<_Tp*> __base;
+    typedef _Tp* value_type;
     _LIBCPP_INLINE_VISIBILITY
     atomic() _NOEXCEPT _LIBCPP_DEFAULT
     _LIBCPP_INLINE_VISIBILITY
@@ -1947,6 +2080,76 @@ atomic_compare_exchange_strong_explicit(atomic<_Tp>* __o, _Tp* __e,
     return __o->compare_exchange_strong(*__e, __d, __s, __f);
 }
 
+// atomic_wait
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_wait(const volatile atomic<_Tp>* __o,
+                 typename atomic<_Tp>::value_type __v) _NOEXCEPT
+{
+    return __o->wait(__v);
+}
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_wait(const atomic<_Tp>* __o,
+                 typename atomic<_Tp>::value_type __v) _NOEXCEPT
+{
+    return __o->wait(__v);
+}
+
+// atomic_wait_explicit
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_wait_explicit(const volatile atomic<_Tp>* __o,
+                          typename atomic<_Tp>::value_type __v,
+                          memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
+{
+    return __o->wait(__v, __m);
+}
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_wait_explicit(const atomic<_Tp>* __o,
+                          typename atomic<_Tp>::value_type __v,
+                          memory_order __m) _NOEXCEPT
+  _LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m)
+{
+    return __o->wait(__v, __m);
+}
+
+// atomic_notify_one
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_notify_one(volatile atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_notify_one(atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+
+// atomic_notify_one
+
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_notify_all(volatile atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+template <class _Tp>
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+void atomic_notify_all(atomic<_Tp>* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+
 // atomic_fetch_add
 
 template <class _Tp>
@@ -2279,6 +2482,13 @@ typedef struct atomic_flag
 {
     __cxx_atomic_impl<_LIBCPP_ATOMIC_FLAG_TYPE> __a_;
 
+    _LIBCPP_INLINE_VISIBILITY
+    bool test(memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
+        {return _LIBCPP_ATOMIC_FLAG_TYPE(true) == __cxx_atomic_load(&__a_, __m);}
+    _LIBCPP_INLINE_VISIBILITY
+    bool test(memory_order __m = memory_order_seq_cst) const _NOEXCEPT
+        {return _LIBCPP_ATOMIC_FLAG_TYPE(true) == __cxx_atomic_load(&__a_, __m);}
+
     _LIBCPP_INLINE_VISIBILITY
     bool test_and_set(memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
         {return __cxx_atomic_exchange(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(true), __m);}
@@ -2292,6 +2502,25 @@ typedef struct atomic_flag
     void clear(memory_order __m = memory_order_seq_cst) _NOEXCEPT
         {__cxx_atomic_store(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(false), __m);}
 
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void wait(bool __v, memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
+        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void wait(bool __v, memory_order __m = memory_order_seq_cst) const _NOEXCEPT
+        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void notify_one() volatile _NOEXCEPT
+        {__cxx_atomic_notify_one(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void notify_one() _NOEXCEPT
+        {__cxx_atomic_notify_one(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void notify_all() volatile _NOEXCEPT
+        {__cxx_atomic_notify_all(&__a_);}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void notify_all() _NOEXCEPT
+        {__cxx_atomic_notify_all(&__a_);}
+
     _LIBCPP_INLINE_VISIBILITY
     atomic_flag() _NOEXCEPT _LIBCPP_DEFAULT
 
@@ -2304,12 +2533,44 @@ typedef struct atomic_flag
     atomic_flag& operator=(const atomic_flag&) volatile = delete;
 #else
 private:
+    _LIBCPP_INLINE_VISIBILITY
     atomic_flag(const atomic_flag&);
+    _LIBCPP_INLINE_VISIBILITY
     atomic_flag& operator=(const atomic_flag&);
+    _LIBCPP_INLINE_VISIBILITY
     atomic_flag& operator=(const atomic_flag&) volatile;
 #endif
 } atomic_flag;
 
+
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+atomic_flag_test(const volatile atomic_flag* __o) _NOEXCEPT
+{
+    return __o->test();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+atomic_flag_test(const atomic_flag* __o) _NOEXCEPT
+{
+    return __o->test();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+atomic_flag_test_explicit(const volatile atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    return __o->test(__m);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+atomic_flag_test_explicit(const atomic_flag* __o, memory_order __m) _NOEXCEPT
+{
+    return __o->test(__m);
+}
+
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 atomic_flag_test_and_set(volatile atomic_flag* __o) _NOEXCEPT
@@ -2366,6 +2627,64 @@ atomic_flag_clear_explicit(atomic_flag* __o, memory_order __m) _NOEXCEPT
     __o->clear(__m);
 }
 
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait(const volatile atomic_flag* __o, bool __v) _NOEXCEPT
+{
+    __o->wait(__v);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait(const atomic_flag* __o, bool __v) _NOEXCEPT
+{
+    __o->wait(__v);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait_explicit(const volatile atomic_flag* __o,
+                          bool __v, memory_order __m) _NOEXCEPT
+{
+    __o->wait(__v, __m);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_wait_explicit(const atomic_flag* __o,
+                          bool __v, memory_order __m) _NOEXCEPT
+{
+    __o->wait(__v, __m);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_one(volatile atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_one(atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_one();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_all(volatile atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_AVAILABILITY_SYNC
+void
+atomic_flag_notify_all(atomic_flag* __o) _NOEXCEPT
+{
+    __o->notify_all();
+}
+
 // fences
 
 inline _LIBCPP_INLINE_VISIBILITY
@@ -2434,6 +2753,33 @@ typedef atomic<ptrdiff_t> atomic_ptrdiff_t;
 typedef atomic<intmax_t>  atomic_intmax_t;
 typedef atomic<uintmax_t> atomic_uintmax_t;
 
+// atomic_*_lock_free : prefer the contention type most highly, then the largest lock-free type
+
+#ifdef __cpp_lib_atomic_is_always_lock_free
+# define _LIBCPP_CONTENTION_LOCK_FREE __atomic_always_lock_free(sizeof(__cxx_contention_t), 0)
+#else
+# define _LIBCPP_CONTENTION_LOCK_FREE false
+#endif
+
+#if ATOMIC_LLONG_LOCK_FREE == 2
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, long long>::type          __libcpp_signed_lock_free;
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned long long>::type __libcpp_unsigned_lock_free;
+#elif ATOMIC_INT_LOCK_FREE == 2
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, int>::type                __libcpp_signed_lock_free;
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned int>::type       __libcpp_unsigned_lock_free;
+#elif ATOMIC_SHORT_LOCK_FREE == 2
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, short>::type              __libcpp_signed_lock_free;
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned short>::type     __libcpp_unsigned_lock_free;
+#elif ATOMIC_CHAR_LOCK_FREE == 2
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, char>::type               __libcpp_signed_lock_free;
+typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned char>::type      __libcpp_unsigned_lock_free;
+#else
+    // No signed/unsigned lock-free types
+#endif
+
+typedef atomic<__libcpp_signed_lock_free> atomic_signed_lock_free;
+typedef atomic<__libcpp_unsigned_lock_free> atomic_unsigned_lock_free;
+
 #define ATOMIC_FLAG_INIT {false}
 #define ATOMIC_VAR_INIT(__v) {__v}
 
diff --git a/gnu/llvm/libcxx/include/barrier b/gnu/llvm/libcxx/include/barrier
new file mode 100644
index 00000000000..58e3eef9cfe
--- /dev/null
+++ b/gnu/llvm/libcxx/include/barrier
@@ -0,0 +1,322 @@
+// -*- C++ -*-
+//===--------------------------- barrier ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_BARRIER
+#define _LIBCPP_BARRIER
+
+/*
+    barrier synopsis
+
+namespace std
+{
+
+  template<class CompletionFunction = see below>
+  class barrier
+  {
+  public:
+    using arrival_token = see below;
+
+    constexpr explicit barrier(ptrdiff_t phase_count,
+                               CompletionFunction f = CompletionFunction());
+    ~barrier();
+
+    barrier(const barrier&) = delete;
+    barrier& operator=(const barrier&) = delete;
+
+    [[nodiscard]] arrival_token arrive(ptrdiff_t update = 1);
+    void wait(arrival_token&& arrival) const;
+
+    void arrive_and_wait();
+    void arrive_and_drop();
+
+  private:
+    CompletionFunction completion; // exposition only
+  };
+
+}
+
+*/
+
+#include <__config>
+#include <atomic>
+#ifndef _LIBCPP_HAS_NO_TREE_BARRIER
+# include <memory>
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#ifdef _LIBCPP_HAS_NO_THREADS
+# error <barrier> is not supported on this single threaded system
+#endif
+
+#if _LIBCPP_STD_VER >= 14
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+struct __empty_completion
+{
+    inline _LIBCPP_INLINE_VISIBILITY
+    void operator()() noexcept
+    {
+    }
+};
+
+#ifndef _LIBCPP_HAS_NO_TREE_BARRIER
+
+/*
+
+The default implementation of __barrier_base is a classic tree barrier.
+
+It looks different from literature pseudocode for two main reasons:
+ 1. Threads that call into std::barrier functions do not provide indices,
+    so a numbering step is added before the actual barrier algorithm,
+    appearing as an N+1 round to the N rounds of the tree barrier.
+ 2. A great deal of attention has been paid to avoid cache line thrashing
+    by flattening the tree structure into cache-line sized arrays, that
+    are indexed in an efficient way.
+
+*/
+
+using __barrier_phase_t = uint8_t;
+
+class __barrier_algorithm_base;
+
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI
+__barrier_algorithm_base* __construct_barrier_algorithm_base(ptrdiff_t& __expected);
+
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI
+bool __arrive_barrier_algorithm_base(__barrier_algorithm_base* __barrier,
+                                     __barrier_phase_t __old_phase);
+
+_LIBCPP_AVAILABILITY_SYNC _LIBCPP_EXPORTED_FROM_ABI
+void __destroy_barrier_algorithm_base(__barrier_algorithm_base* __barrier);
+
+template<class _CompletionF>
+class __barrier_base {
+
+    ptrdiff_t                                               __expected;
+    unique_ptr<__barrier_algorithm_base,
+               void (*)(__barrier_algorithm_base*)>         __base;
+    __atomic_base<ptrdiff_t>                                __expected_adjustment;
+    _CompletionF                                            __completion;
+    __atomic_base<__barrier_phase_t>                        __phase;
+
+public:
+    using arrival_token = __barrier_phase_t;
+
+    static constexpr ptrdiff_t max() noexcept {
+        return numeric_limits<ptrdiff_t>::max();
+    }
+
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    __barrier_base(ptrdiff_t __expected, _CompletionF __completion = _CompletionF())
+            : __expected(__expected), __base(__construct_barrier_algorithm_base(this->__expected),
+                                             &__destroy_barrier_algorithm_base),
+              __expected_adjustment(0), __completion(move(__completion)), __phase(0)
+    {
+    }
+    [[nodiscard]] _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    arrival_token arrive(ptrdiff_t update)
+    {
+        auto const __old_phase = __phase.load(memory_order_relaxed);
+        for(; update; --update)
+            if(__arrive_barrier_algorithm_base(__base.get(), __old_phase)) {
+                __completion();
+                __expected += __expected_adjustment.load(memory_order_relaxed);
+                __expected_adjustment.store(0, memory_order_relaxed);
+                __phase.store(__old_phase + 2, memory_order_release);
+                __phase.notify_all();
+            }
+        return __old_phase;
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void wait(arrival_token&& __old_phase) const
+    {
+        auto const __test_fn = [=]() -> bool {
+            return __phase.load(memory_order_acquire) != __old_phase;
+        };
+        __libcpp_thread_poll_with_backoff(__test_fn, __libcpp_timed_backoff_policy());
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void arrive_and_drop()
+    {
+        __expected_adjustment.fetch_sub(1, memory_order_relaxed);
+        (void)arrive(1);
+    }
+};
+
+#else
+
+/*
+
+The alternative implementation of __barrier_base is a central barrier.
+
+Two versions of this algorithm are provided:
+ 1. A fairly straightforward implementation of the litterature for the
+    general case where the completion function is not empty.
+ 2. An optimized implementation that exploits 2's complement arithmetic
+    and well-defined overflow in atomic arithmetic, to handle the phase
+    roll-over for free.
+
+*/
+
+template<class _CompletionF>
+class __barrier_base {
+
+    __atomic_base<ptrdiff_t> __expected;
+    __atomic_base<ptrdiff_t> __arrived;
+    _CompletionF             __completion;
+    __atomic_base<bool>      __phase;
+public:
+    using arrival_token = bool;
+
+    static constexpr ptrdiff_t max() noexcept {
+        return numeric_limits<ptrdiff_t>::max();
+    }
+
+    _LIBCPP_INLINE_VISIBILITY
+    __barrier_base(ptrdiff_t __expected, _CompletionF __completion = _CompletionF())
+        : __expected(__expected), __arrived(__expected), __completion(move(__completion)), __phase(false)
+    {
+    }
+    [[nodiscard]] _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    arrival_token arrive(ptrdiff_t update)
+    {
+        auto const __old_phase = __phase.load(memory_order_relaxed);
+        auto const __result = __arrived.fetch_sub(update, memory_order_acq_rel) - update;
+        auto const new_expected = __expected.load(memory_order_relaxed);
+        if(0 == __result) {
+            __completion();
+            __arrived.store(new_expected, memory_order_relaxed);
+            __phase.store(!__old_phase, memory_order_release);
+            __phase.notify_all();
+        }
+        return __old_phase;
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void wait(arrival_token&& __old_phase) const
+    {
+        __phase.wait(__old_phase, memory_order_acquire);
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void arrive_and_drop()
+    {
+        __expected.fetch_sub(1, memory_order_relaxed);
+        (void)arrive(1);
+    }
+};
+
+template<>
+class __barrier_base<__empty_completion> {
+
+    static constexpr uint64_t __expected_unit = 1ull;
+    static constexpr uint64_t __arrived_unit = 1ull << 32;
+    static constexpr uint64_t __expected_mask = __arrived_unit - 1;
+    static constexpr uint64_t __phase_bit = 1ull << 63;
+    static constexpr uint64_t __arrived_mask = (__phase_bit - 1) & ~__expected_mask;
+
+    __atomic_base<uint64_t>   __phase_arrived_expected;
+
+    static _LIBCPP_INLINE_VISIBILITY
+    constexpr uint64_t __init(ptrdiff_t __count) _NOEXCEPT
+    {
+        return ((uint64_t(1u << 31) - __count) << 32)
+              | (uint64_t(1u << 31) - __count);
+    }
+
+public:
+    using arrival_token = uint64_t;
+
+    static constexpr ptrdiff_t max() noexcept {
+        return ptrdiff_t(1u << 31) - 1;
+    }
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit inline __barrier_base(ptrdiff_t __count, __empty_completion = __empty_completion())
+        : __phase_arrived_expected(__init(__count))
+    {
+    }
+    [[nodiscard]] inline _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    arrival_token arrive(ptrdiff_t update)
+    {
+        auto const __inc = __arrived_unit * update;
+        auto const __old = __phase_arrived_expected.fetch_add(__inc, memory_order_acq_rel);
+        if((__old ^ (__old + __inc)) & __phase_bit) {
+            __phase_arrived_expected.fetch_add((__old & __expected_mask) << 32, memory_order_relaxed);
+            __phase_arrived_expected.notify_all();
+        }
+        return __old & __phase_bit;
+    }
+    inline _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void wait(arrival_token&& __phase) const
+    {
+        auto const __test_fn = [=]() -> bool {
+            uint64_t const __current = __phase_arrived_expected.load(memory_order_acquire);
+            return ((__current & __phase_bit) != __phase);
+        };
+        __libcpp_thread_poll_with_backoff(__test_fn, __libcpp_timed_backoff_policy());
+    }
+    inline _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void arrive_and_drop()
+    {
+        __phase_arrived_expected.fetch_add(__expected_unit, memory_order_relaxed);
+        (void)arrive(1);
+    }
+};
+
+#endif //_LIBCPP_HAS_NO_TREE_BARRIER
+
+template<class _CompletionF = __empty_completion>
+class barrier {
+
+    __barrier_base<_CompletionF> __b;
+public:
+    using arrival_token = typename __barrier_base<_CompletionF>::arrival_token;
+
+    static constexpr ptrdiff_t max() noexcept {
+        return __barrier_base<_CompletionF>::max();
+    }
+
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    barrier(ptrdiff_t __count, _CompletionF __completion = _CompletionF())
+        : __b(__count, std::move(__completion)) {
+    }
+
+    barrier(barrier const&) = delete;
+    barrier& operator=(barrier const&) = delete;
+
+    [[nodiscard]] _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    arrival_token arrive(ptrdiff_t update = 1)
+    {
+        return __b.arrive(update);
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void wait(arrival_token&& __phase) const
+    {
+        __b.wait(std::move(__phase));
+    }
+	_LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void arrive_and_wait()
+    {
+        wait(arrive());
+	}
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void arrive_and_drop()
+    {
+        __b.arrive_and_drop();
+    }
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 14
+
+#endif //_LIBCPP_BARRIER
diff --git a/gnu/llvm/libcxx/include/bit b/gnu/llvm/libcxx/include/bit
index 6dc85b5d01f..ae4605b1916 100644
--- a/gnu/llvm/libcxx/include/bit
+++ b/gnu/llvm/libcxx/include/bit
@@ -15,6 +15,7 @@
 
 namespace std {
 
+  // [bit.pow.two], integral powers of 2
   template <class T>
     constexpr bool ispow2(T x) noexcept; // C++20
   template <class T>
@@ -24,13 +25,13 @@ namespace std {
   template <class T>
     constexpr T log2p1(T x) noexcept;    // C++20
 
-  // 23.20.2, rotating
+  // [bit.rotate], rotating
   template<class T>
     constexpr T rotl(T x, unsigned int s) noexcept; // C++20
   template<class T>
     constexpr T rotr(T x, unsigned int s) noexcept; // C++20
 
-  // 23.20.3, counting
+  // [bit.count], counting
   template<class T>
     constexpr int countl_zero(T x) noexcept;  // C++20
   template<class T>
@@ -42,7 +43,7 @@ namespace std {
   template<class T>
     constexpr int popcount(T x) noexcept;     // C++20
 
-  // 20.15.9, endian
+  // [bit.endian], endian
   enum class endian {
     little = see below,        // C++20
     big = see below,           // C++20
@@ -350,7 +351,7 @@ _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
 bool __ispow2(_Tp __t) _NOEXCEPT
 {
     static_assert(__bitop_unsigned_integer<_Tp>::value, "__ispow2 requires unsigned");
-	return __t != 0 && (((__t & (__t - 1)) == 0));
+    return __t != 0 && (((__t & (__t - 1)) == 0));
 }
 
 
diff --git a/gnu/llvm/libcxx/include/charconv b/gnu/llvm/libcxx/include/charconv
index a644fe09484..b64000242a7 100644
--- a/gnu/llvm/libcxx/include/charconv
+++ b/gnu/llvm/libcxx/include/charconv
@@ -73,6 +73,7 @@ namespace std {
 
 */
 
+#include <__config>
 #include <__errc>
 #include <type_traits>
 #include <limits>
@@ -92,8 +93,8 @@ _LIBCPP_PUSH_MACROS
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace __itoa {
-_LIBCPP_FUNC_VIS char* __u64toa(uint64_t __value, char* __buffer);
-_LIBCPP_FUNC_VIS char* __u32toa(uint32_t __value, char* __buffer);
+_LIBCPP_AVAILABILITY_TO_CHARS _LIBCPP_FUNC_VIS char* __u64toa(uint64_t __value, char* __buffer) _NOEXCEPT;
+_LIBCPP_AVAILABILITY_TO_CHARS _LIBCPP_FUNC_VIS char* __u32toa(uint32_t __value, char* __buffer) _NOEXCEPT;
 }
 
 #ifndef _LIBCPP_CXX03_LANG
@@ -167,6 +168,7 @@ struct _LIBCPP_HIDDEN __traits_base
     }
 #endif
 
+    _LIBCPP_AVAILABILITY_TO_CHARS
     static _LIBCPP_INLINE_VISIBILITY char* __convert(_Tp __v, char* __p)
     {
         return __u64toa(__v, __p);
@@ -189,6 +191,7 @@ struct _LIBCPP_HIDDEN
     }
 #endif
 
+    _LIBCPP_AVAILABILITY_TO_CHARS
     static _LIBCPP_INLINE_VISIBILITY char* __convert(_Tp __v, char* __p)
     {
         return __u32toa(__v, __p);
@@ -292,6 +295,7 @@ __to_unsigned(_Tp __x)
 }
 
 template <typename _Tp>
+_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_INLINE_VISIBILITY to_chars_result
 __to_chars_itoa(char* __first, char* __last, _Tp __value, true_type)
 {
@@ -306,6 +310,7 @@ __to_chars_itoa(char* __first, char* __last, _Tp __value, true_type)
 }
 
 template <typename _Tp>
+_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_INLINE_VISIBILITY to_chars_result
 __to_chars_itoa(char* __first, char* __last, _Tp __value, false_type)
 {
@@ -337,6 +342,7 @@ __to_chars_itoa(char* __first, char* __last, _Tp __value, false_type)
 }
 
 template <typename _Tp>
+_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_INLINE_VISIBILITY to_chars_result
 __to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
                     true_type)
@@ -352,6 +358,7 @@ __to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
 }
 
 template <typename _Tp>
+_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_INLINE_VISIBILITY to_chars_result
 __to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
                     false_type)
@@ -380,6 +387,7 @@ __to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
 }
 
 template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
+_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_INLINE_VISIBILITY to_chars_result
 to_chars(char* __first, char* __last, _Tp __value)
 {
@@ -387,6 +395,7 @@ to_chars(char* __first, char* __last, _Tp __value)
 }
 
 template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
+_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_INLINE_VISIBILITY to_chars_result
 to_chars(char* __first, char* __last, _Tp __value, int __base)
 {
diff --git a/gnu/llvm/libcxx/include/chrono b/gnu/llvm/libcxx/include/chrono
index 6e5de398b72..117aab31907 100644
--- a/gnu/llvm/libcxx/include/chrono
+++ b/gnu/llvm/libcxx/include/chrono
@@ -2454,7 +2454,7 @@ chrono::day year_month_day_last::day() const noexcept
         chrono::day(31), chrono::day(31), chrono::day(30),
         chrono::day(31), chrono::day(30), chrono::day(31)
     };
-    return month() != February || !__y.is_leap() ?
+    return (month() != February || !__y.is_leap()) && month().ok() ?
         __d[static_cast<unsigned>(month()) - 1] : chrono::day{29};
 }
 
diff --git a/gnu/llvm/libcxx/include/cmath b/gnu/llvm/libcxx/include/cmath
index 0f06486fb34..0901a23a249 100644
--- a/gnu/llvm/libcxx/include/cmath
+++ b/gnu/llvm/libcxx/include/cmath
@@ -296,6 +296,10 @@ floating_point trunc (arithmetic x);
 float          truncf(float x);
 long double    truncl(long double x);
 
+constexpr float       lerp(float a, float b, float t) noexcept;                   // C++20
+constexpr double      lerp(double a, double b, double t) noexcept;                // C++20
+constexpr long double lerp(long double a, long double b, long double t) noexcept; // C++20
+
 }  // std
 
 */
diff --git a/gnu/llvm/libcxx/include/codecvt b/gnu/llvm/libcxx/include/codecvt
index 5ea411ea781..05fa765c318 100644
--- a/gnu/llvm/libcxx/include/codecvt
+++ b/gnu/llvm/libcxx/include/codecvt
@@ -102,11 +102,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -137,11 +137,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -172,11 +172,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
@@ -225,11 +225,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -260,11 +260,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -295,11 +295,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -330,11 +330,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -365,11 +365,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -400,11 +400,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
@@ -453,11 +453,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -488,11 +488,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -523,11 +523,11 @@ protected:
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
diff --git a/gnu/llvm/libcxx/include/compare b/gnu/llvm/libcxx/include/compare
index e05257bebfa..717859a1e3a 100644
--- a/gnu/llvm/libcxx/include/compare
+++ b/gnu/llvm/libcxx/include/compare
@@ -43,6 +43,84 @@ namespace std {
   template<class T> constexpr partial_ordering partial_order(const T& a, const T& b);
   template<class T> constexpr strong_equality strong_equal(const T& a, const T& b);
   template<class T> constexpr weak_equality weak_equal(const T& a, const T& b);
+
+  // [cmp.partialord], Class partial_ordering
+  class partial_ordering {
+  public:
+    // valid values
+    static const partial_ordering less;
+    static const partial_ordering equivalent;
+    static const partial_ordering greater;
+    static const partial_ordering unordered;
+
+    // comparisons
+    friend constexpr bool operator==(partial_ordering v, unspecified) noexcept;
+    friend constexpr bool operator==(partial_ordering v, partial_ordering w) noexcept = default;
+    friend constexpr bool operator< (partial_ordering v, unspecified) noexcept;
+    friend constexpr bool operator> (partial_ordering v, unspecified) noexcept;
+    friend constexpr bool operator<=(partial_ordering v, unspecified) noexcept;
+    friend constexpr bool operator>=(partial_ordering v, unspecified) noexcept;
+    friend constexpr bool operator< (unspecified, partial_ordering v) noexcept;
+    friend constexpr bool operator> (unspecified, partial_ordering v) noexcept;
+    friend constexpr bool operator<=(unspecified, partial_ordering v) noexcept;
+    friend constexpr bool operator>=(unspecified, partial_ordering v) noexcept;
+    friend constexpr partial_ordering operator<=>(partial_ordering v, unspecified) noexcept;
+    friend constexpr partial_ordering operator<=>(unspecified, partial_ordering v) noexcept;
+  };
+
+  // [cmp.weakord], Class weak_ordering
+  class weak_ordering {
+  public:
+    // valid values
+    static const weak_ordering less;
+    static const weak_ordering equivalent;
+    static const weak_ordering greater;
+
+    // conversions
+    constexpr operator partial_ordering() const noexcept;
+
+    // comparisons
+    friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
+    friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
+    friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
+    friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
+    friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
+    friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
+    friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
+    friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
+    friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
+    friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
+    friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
+    friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
+  };
+
+  // [cmp.strongord], Class strong_ordering
+  class strong_ordering {
+  public:
+    // valid values
+    static const strong_ordering less;
+    static const strong_ordering equal;
+    static const strong_ordering equivalent;
+    static const strong_ordering greater;
+
+    // conversions
+    constexpr operator partial_ordering() const noexcept;
+    constexpr operator weak_ordering() const noexcept;
+
+    // comparisons
+    friend constexpr bool operator==(strong_ordering v, unspecified) noexcept;
+    friend constexpr bool operator==(strong_ordering v, strong_ordering w) noexcept = default;
+    friend constexpr bool operator< (strong_ordering v, unspecified) noexcept;
+    friend constexpr bool operator> (strong_ordering v, unspecified) noexcept;
+    friend constexpr bool operator<=(strong_ordering v, unspecified) noexcept;
+    friend constexpr bool operator>=(strong_ordering v, unspecified) noexcept;
+    friend constexpr bool operator< (unspecified, strong_ordering v) noexcept;
+    friend constexpr bool operator> (unspecified, strong_ordering v) noexcept;
+    friend constexpr bool operator<=(unspecified, strong_ordering v) noexcept;
+    friend constexpr bool operator>=(unspecified, strong_ordering v) noexcept;
+    friend constexpr strong_ordering operator<=>(strong_ordering v, unspecified) noexcept;
+    friend constexpr strong_ordering operator<=>(unspecified, strong_ordering v) noexcept;
+  };
 }
 */
 
@@ -248,6 +326,8 @@ public:
   _LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
 
 #ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
+  _LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(partial_ordering, partial_ordering) noexcept = default;
+
   _LIBCPP_INLINE_VISIBILITY friend constexpr partial_ordering operator<=>(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
   _LIBCPP_INLINE_VISIBILITY friend constexpr partial_ordering operator<=>(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
 #endif
@@ -364,6 +444,8 @@ public:
   _LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
 
 #ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
+  _LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(weak_ordering, weak_ordering) noexcept = default;
+
   _LIBCPP_INLINE_VISIBILITY friend constexpr weak_ordering operator<=>(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
   _LIBCPP_INLINE_VISIBILITY friend constexpr weak_ordering operator<=>(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
 #endif
@@ -490,6 +572,8 @@ public:
   _LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
 
 #ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
+  _LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(strong_ordering, strong_ordering) noexcept = default;
+
   _LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
   _LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
 #endif
diff --git a/gnu/llvm/libcxx/include/complex b/gnu/llvm/libcxx/include/complex
index c168406befb..36c66db50e6 100644
--- a/gnu/llvm/libcxx/include/complex
+++ b/gnu/llvm/libcxx/include/complex
@@ -243,6 +243,7 @@ template<class T, class charT, class traits>
 #include <type_traits>
 #include <stdexcept>
 #include <cmath>
+#include <iosfwd>
 #include <sstream>
 #include <version>
 
@@ -1406,10 +1407,10 @@ operator>>(basic_istream<_CharT, _Traits>& __is, complex<_Tp>& __x)
                             __x = complex<_Tp>(__r, __i);
                         }
                         else
-                            __is.setstate(ios_base::failbit);
+                            __is.setstate(__is.failbit);
                     }
                     else
-                        __is.setstate(ios_base::failbit);
+                        __is.setstate(__is.failbit);
                 }
                 else if (__c == _CharT(')'))
                 {
@@ -1417,10 +1418,10 @@ operator>>(basic_istream<_CharT, _Traits>& __is, complex<_Tp>& __x)
                     __x = complex<_Tp>(__r, _Tp(0));
                 }
                 else
-                    __is.setstate(ios_base::failbit);
+                    __is.setstate(__is.failbit);
             }
             else
-                __is.setstate(ios_base::failbit);
+                __is.setstate(__is.failbit);
         }
         else
         {
@@ -1429,11 +1430,11 @@ operator>>(basic_istream<_CharT, _Traits>& __is, complex<_Tp>& __x)
             if (!__is.fail())
                 __x = complex<_Tp>(__r, _Tp(0));
             else
-                __is.setstate(ios_base::failbit);
+                __is.setstate(__is.failbit);
         }
     }
     else
-        __is.setstate(ios_base::failbit);
+        __is.setstate(__is.failbit);
     return __is;
 }
 
diff --git a/gnu/llvm/libcxx/include/concepts b/gnu/llvm/libcxx/include/concepts
new file mode 100644
index 00000000000..047e2c290f4
--- /dev/null
+++ b/gnu/llvm/libcxx/include/concepts
@@ -0,0 +1,166 @@
+// -*- C++ -*-
+//===-------------------------- concepts ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_CONCEPTS
+#define _LIBCPP_CONCEPTS
+
+/*
+    concepts synopsis
+namespace std {
+  // [concepts.lang], language-related concepts
+  // [concept.same], concept same_as
+  template<class T, class U>
+    concept same_as = see below;
+
+  // [concept.derived], concept derived_from
+  template<class Derived, class Base>
+    concept derived_from = see below;
+
+  // [concept.convertible], concept convertible_to
+  template<class From, class To>
+    concept convertible_to = see below;
+
+  // [concept.commonref], concept common_reference_with
+  template<class T, class U>
+    concept common_reference_with = see below;
+
+  // [concept.common], concept common_with
+  template<class T, class U>
+    concept common_with = see below;
+
+  // [concepts.arithmetic], arithmetic concepts
+  template<class T>
+    concept integral = see below;
+  template<class T>
+    concept signed_integral = see below;
+  template<class T>
+    concept unsigned_integral = see below;
+  template<class T>
+    concept floating_point = see below;
+
+  // [concept.assignable], concept assignable_from
+  template<class LHS, class RHS>
+    concept assignable_from = see below;
+
+  // [concept.swappable], concept swappable
+  namespace ranges {
+    inline namespace unspecified {
+      inline constexpr unspecified swap = unspecified;
+    }
+  }
+  template<class T>
+    concept swappable = see below;
+  template<class T, class U>
+    concept swappable_with = see below;
+
+  // [concept.destructible], concept destructible
+  template<class T>
+    concept destructible = see below;
+
+  // [concept.constructible], concept constructible_from
+  template<class T, class... Args>
+    concept constructible_from = see below;
+
+  // [concept.defaultconstructible], concept default_constructible
+  template<class T>
+    concept default_constructible = see below;
+
+  // [concept.moveconstructible], concept move_constructible
+  template<class T>
+    concept move_constructible = see below;
+
+  // [concept.copyconstructible], concept copy_constructible
+  template<class T>
+    concept copy_constructible = see below;
+
+  // [concepts.compare], comparison concepts
+  // [concept.boolean], concept boolean
+  template<class B>
+    concept boolean = see below;
+
+  // [concept.equalitycomparable], concept equality_comparable
+  template<class T>
+    concept equality_comparable = see below;
+  template<class T, class U>
+    concept equality_comparable_with = see below;
+
+  // [concept.totallyordered], concept totally_ordered
+  template<class T>
+    concept totally_ordered = see below;
+  template<class T, class U>
+    concept totally_ordered_with = see below;
+
+  // [concepts.object], object concepts
+  template<class T>
+    concept movable = see below;
+  template<class T>
+    concept copyable = see below;
+  template<class T>
+    concept semiregular = see below;
+  template<class T>
+    concept regular = see below;
+
+  // [concepts.callable], callable concepts
+  // [concept.invocable], concept invocable
+  template<class F, class... Args>
+    concept invocable = see below;
+
+  // [concept.regularinvocable], concept regular_invocable
+  template<class F, class... Args>
+    concept regular_invocable = see below;
+
+  // [concept.predicate], concept predicate
+  template<class F, class... Args>
+    concept predicate = see below;
+
+  // [concept.relation], concept relation
+  template<class R, class T, class U>
+    concept relation = see below;
+
+  // [concept.equiv], concept equivalence_relation
+  template<class R, class T, class U>
+    concept equivalence_relation = see below;
+
+  // [concept.strictweakorder], concept strict_weak_order
+  template<class R, class T, class U>
+    concept strict_weak_order = see below;
+}
+
+*/
+
+#include <__config>
+#include <type_traits>
+#include <version>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L
+
+// [concept.same]
+
+template<class _Tp, class _Up>
+concept __same_as_impl = _VSTD::_IsSame<_Tp, _Up>::value;
+
+template<class _Tp, class _Up>
+concept same_as = __same_as_impl<_Tp, _Up> && __same_as_impl<_Up, _Tp>;
+
+#endif //_LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP_CONCEPTS
diff --git a/gnu/llvm/libcxx/include/cstddef b/gnu/llvm/libcxx/include/cstddef
index bd62d6db39e..2a0bfeb6e15 100644
--- a/gnu/llvm/libcxx/include/cstddef
+++ b/gnu/llvm/libcxx/include/cstddef
@@ -25,7 +25,7 @@ Types:
 
     ptrdiff_t
     size_t
-    max_align_t
+    max_align_t // C++11
     nullptr_t
     byte // C++17
 
@@ -49,12 +49,34 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 using ::ptrdiff_t;
 using ::size_t;
 
-#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \
-    defined(__DEFINED_max_align_t) || defined(__NetBSD__)
-// Re-use the compiler's <stddef.h> max_align_t where possible.
+#if !defined(_LIBCPP_CXX03_LANG)
 using ::max_align_t;
-#else
-typedef long double max_align_t;
+#endif
+
+template <class _Tp> struct __libcpp_is_integral                     { enum { value = 0 }; };
+template <>          struct __libcpp_is_integral<bool>               { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<char>               { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<signed char>        { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<unsigned char>      { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<wchar_t>            { enum { value = 1 }; };
+#ifndef _LIBCPP_NO_HAS_CHAR8_T
+template <>          struct __libcpp_is_integral<char8_t>            { enum { value = 1 }; };
+#endif
+#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
+template <>          struct __libcpp_is_integral<char16_t>           { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<char32_t>           { enum { value = 1 }; };
+#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+template <>          struct __libcpp_is_integral<short>              { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<unsigned short>     { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<int>                { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<unsigned int>       { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<long>               { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<unsigned long>      { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<long long>          { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<unsigned long long> { enum { value = 1 }; };
+#ifndef _LIBCPP_HAS_NO_INT128
+template <>          struct __libcpp_is_integral<__int128_t>         { enum { value = 1 }; };
+template <>          struct __libcpp_is_integral<__uint128_t>        { enum { value = 1 }; };
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
@@ -64,6 +86,11 @@ namespace std  // purposefully not versioned
 {
 enum class byte : unsigned char {};
 
+
+template <bool> struct __enable_if_integral_imp {};
+template <> struct __enable_if_integral_imp<true> { using type = byte; };
+template <class _Tp> using _EnableByteOverload = typename __enable_if_integral_imp<__libcpp_is_integral<_Tp>::value>::type;
+
 constexpr byte  operator| (byte  __lhs, byte __rhs) noexcept
 {
     return static_cast<byte>(
@@ -104,10 +131,31 @@ constexpr byte  operator~ (byte __b) noexcept
         ~static_cast<unsigned int>(__b)
     ));
 }
-
+template <class _Integer>
+  constexpr _EnableByteOverload<_Integer> &
+  operator<<=(byte& __lhs, _Integer __shift) noexcept
+  { return __lhs = __lhs << __shift; }
+
+template <class _Integer>
+  constexpr _EnableByteOverload<_Integer>
+  operator<< (byte  __lhs, _Integer __shift) noexcept
+  { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); }
+
+template <class _Integer>
+  constexpr _EnableByteOverload<_Integer> &
+  operator>>=(byte& __lhs, _Integer __shift) noexcept
+  { return __lhs = __lhs >> __shift; }
+
+template <class _Integer>
+  constexpr _EnableByteOverload<_Integer>
+  operator>> (byte  __lhs, _Integer __shift) noexcept
+  { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); }
+
+template <class _Integer, class = _EnableByteOverload<_Integer> >
+  constexpr _Integer
+  to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); }
 }
 
-#include <type_traits>  // rest of byte
 #endif
 
 #endif  // _LIBCPP_CSTDDEF
diff --git a/gnu/llvm/libcxx/include/cstdio b/gnu/llvm/libcxx/include/cstdio
index 0f3f42dac2d..d0492a08350 100644
--- a/gnu/llvm/libcxx/include/cstdio
+++ b/gnu/llvm/libcxx/include/cstdio
@@ -131,9 +131,13 @@ using ::putc;
 using ::ungetc;
 using ::fread;
 using ::fwrite;
+#ifndef _LIBCPP_HAS_NO_FGETPOS_FSETPOS
 using ::fgetpos;
+#endif
 using ::fseek;
+#ifndef _LIBCPP_HAS_NO_FGETPOS_FSETPOS
 using ::fsetpos;
+#endif
 using ::ftell;
 using ::rewind;
 using ::clearerr;
diff --git a/gnu/llvm/libcxx/include/deque b/gnu/llvm/libcxx/include/deque
index 115b1b64270..c2ea5f2dbe6 100644
--- a/gnu/llvm/libcxx/include/deque
+++ b/gnu/llvm/libcxx/include/deque
@@ -150,9 +150,11 @@ template <class T, class Allocator>
          noexcept(noexcept(x.swap(y)));
 
 template <class T, class Allocator, class U>
-    void erase(deque<T, Allocator>& c, const U& value);       // C++20
+    typename deque<T, Allocator>::size_type
+    erase(deque<T, Allocator>& c, const U& value);       // C++20
 template <class T, class Allocator, class Predicate>
-    void erase_if(deque<T, Allocator>& c, Predicate pred);    // C++20
+    typename deque<T, Allocator>::size_type
+    erase_if(deque<T, Allocator>& c, Predicate pred);    // C++20
 
 }  // std
 
@@ -3021,14 +3023,20 @@ swap(deque<_Tp, _Allocator>& __x, deque<_Tp, _Allocator>& __y)
 
 #if _LIBCPP_STD_VER > 17
 template <class _Tp, class _Allocator, class _Up>
-inline _LIBCPP_INLINE_VISIBILITY
-void erase(deque<_Tp, _Allocator>& __c, const _Up& __v)
-{ __c.erase(_VSTD::remove(__c.begin(), __c.end(), __v), __c.end()); }
+inline _LIBCPP_INLINE_VISIBILITY typename deque<_Tp, _Allocator>::size_type
+erase(deque<_Tp, _Allocator>& __c, const _Up& __v) {
+  auto __old_size = __c.size();
+  __c.erase(_VSTD::remove(__c.begin(), __c.end(), __v), __c.end());
+  return __old_size - __c.size();
+}
 
 template <class _Tp, class _Allocator, class _Predicate>
-inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(deque<_Tp, _Allocator>& __c, _Predicate __pred)
-{ __c.erase(_VSTD::remove_if(__c.begin(), __c.end(), __pred), __c.end()); }
+inline _LIBCPP_INLINE_VISIBILITY typename deque<_Tp, _Allocator>::size_type
+erase_if(deque<_Tp, _Allocator>& __c, _Predicate __pred) {
+  auto __old_size = __c.size();
+  __c.erase(_VSTD::remove_if(__c.begin(), __c.end(), __pred), __c.end());
+  return __old_size - __c.size();
+}
 #endif
 
 
diff --git a/gnu/llvm/libcxx/include/exception b/gnu/llvm/libcxx/include/exception
index c7dcac2b2b3..8e32979f574 100644
--- a/gnu/llvm/libcxx/include/exception
+++ b/gnu/llvm/libcxx/include/exception
@@ -98,6 +98,8 @@ class _LIBCPP_EXCEPTION_ABI exception
 {
 public:
     _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
+    _LIBCPP_INLINE_VISIBILITY exception(const exception&) _NOEXCEPT = default;
+
     virtual ~exception() _NOEXCEPT;
     virtual const char* what() const _NOEXCEPT;
 };
diff --git a/gnu/llvm/libcxx/include/filesystem b/gnu/llvm/libcxx/include/filesystem
index 0f7a4d55698..1363b630271 100644
--- a/gnu/llvm/libcxx/include/filesystem
+++ b/gnu/llvm/libcxx/include/filesystem
@@ -1346,6 +1346,7 @@ public:
   _LIBCPP_INLINE_VISIBILITY
   const path& path2() const noexcept { return __storage_->__p2_; }
 
+  filesystem_error(const filesystem_error&) = default;
   ~filesystem_error() override; // key function
 
   _LIBCPP_INLINE_VISIBILITY
diff --git a/gnu/llvm/libcxx/include/forward_list b/gnu/llvm/libcxx/include/forward_list
index 3905745931f..3bd8db8b7d4 100644
--- a/gnu/llvm/libcxx/include/forward_list
+++ b/gnu/llvm/libcxx/include/forward_list
@@ -169,9 +169,11 @@ template <class T, class Allocator>
          noexcept(noexcept(x.swap(y)));
 
 template <class T, class Allocator, class U>
-    void erase(forward_list<T, Allocator>& c, const U& value);       // C++20
+    typename forward_list<T, Allocator>::size_type
+    erase(forward_list<T, Allocator>& c, const U& value);       // C++20
 template <class T, class Allocator, class Predicate>
-    void erase_if(forward_list<T, Allocator>& c, Predicate pred);    // C++20
+    typename forward_list<T, Allocator>::size_type
+    erase_if(forward_list<T, Allocator>& c, Predicate pred);    // C++20
 
 }  // std
 
@@ -1765,13 +1767,17 @@ swap(forward_list<_Tp, _Alloc>& __x, forward_list<_Tp, _Alloc>& __y)
 #if _LIBCPP_STD_VER > 17
 template <class _Tp, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(forward_list<_Tp, _Allocator>& __c, _Predicate __pred)
-{ __c.remove_if(__pred); }
+    typename forward_list<_Tp, _Allocator>::size_type
+    erase_if(forward_list<_Tp, _Allocator>& __c, _Predicate __pred) {
+  return __c.remove_if(__pred);
+}
 
 template <class _Tp, class _Allocator, class _Up>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase(forward_list<_Tp, _Allocator>& __c, const _Up& __v)
-{ _VSTD::erase_if(__c, [&](auto& __elem) { return __elem == __v; }); }
+    typename forward_list<_Tp, _Allocator>::size_type
+    erase(forward_list<_Tp, _Allocator>& __c, const _Up& __v) {
+  return _VSTD::erase_if(__c, [&](auto& __elem) { return __elem == __v; });
+}
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/include/functional b/gnu/llvm/libcxx/include/functional
index 865a28123b9..3e9425320fc 100644
--- a/gnu/llvm/libcxx/include/functional
+++ b/gnu/llvm/libcxx/include/functional
@@ -508,6 +508,10 @@ POLICY:  For non-variadic implementations, the number of arguments is limited
 
 #include <__functional_base>
 
+#if defined(_LIBCPP_HAS_BLOCKS_RUNTIME) && !defined(_LIBCPP_HAS_OBJC_ARC)
+#include <Block.h>
+#endif
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -1434,7 +1438,14 @@ void __throw_bad_function_call()
 #endif
 }
 
-template<class _Fp> class _LIBCPP_TEMPLATE_VIS function; // undefined
+#if defined(_LIBCPP_CXX03_LANG) && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) && __has_attribute(deprecated)
+#   define _LIBCPP_DEPRECATED_CXX03_FUNCTION \
+        __attribute__((deprecated("Using std::function in C++03 is not supported anymore. Please upgrade to C++11 or later, or use a different type")))
+#else
+#   define _LIBCPP_DEPRECATED_CXX03_FUNCTION /* nothing */
+#endif
+
+template<class _Fp> class _LIBCPP_DEPRECATED_CXX03_FUNCTION _LIBCPP_TEMPLATE_VIS function; // undefined
 
 namespace __function
 {
@@ -1477,6 +1488,12 @@ template <class _Fp>
 _LIBCPP_INLINE_VISIBILITY
 bool __not_null(function<_Fp> const& __f) { return !!__f; }
 
+#ifdef _LIBCPP_HAS_EXTENSION_BLOCKS
+template <class _Rp, class ..._Args>
+_LIBCPP_INLINE_VISIBILITY
+bool __not_null(_Rp (^__p)(_Args...)) { return __p; }
+#endif
+
 } // namespace __function
 
 #ifndef _LIBCPP_CXX03_LANG
@@ -1611,7 +1628,7 @@ public:
 
 // __base provides an abstract interface for copyable functors.
 
-template<class _Fp> class __base;
+template<class _Fp> class _LIBCPP_TEMPLATE_VIS __base;
 
 template<class _Rp, class ..._ArgTypes>
 class __base<_Rp(_ArgTypes...)>
@@ -2238,6 +2255,72 @@ template <class _Rp, class... _ArgTypes> class __policy_func<_Rp(_ArgTypes...)>
 #endif // _LIBCPP_NO_RTTI
 };
 
+#if defined(_LIBCPP_HAS_BLOCKS_RUNTIME) && !defined(_LIBCPP_HAS_OBJC_ARC)
+
+template<class _Rp1, class ..._ArgTypes1, class _Alloc, class _Rp, class ..._ArgTypes>
+class __func<_Rp1(^)(_ArgTypes1...), _Alloc, _Rp(_ArgTypes...)>
+    : public  __base<_Rp(_ArgTypes...)>
+{
+    typedef _Rp1(^__block_type)(_ArgTypes1...);
+    __block_type __f_;
+
+public:
+    _LIBCPP_INLINE_VISIBILITY
+    explicit __func(__block_type const& __f)
+        : __f_(__f ? Block_copy(__f) : (__block_type)0)
+    { }
+
+    // [TODO] add && to save on a retain
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit __func(__block_type __f, const _Alloc& /* unused */)
+        : __f_(__f ? Block_copy(__f) : (__block_type)0)
+    { }
+
+    virtual __base<_Rp(_ArgTypes...)>* __clone() const {
+        _LIBCPP_ASSERT(false,
+            "Block pointers are just pointers, so they should always fit into "
+            "std::function's small buffer optimization. This function should "
+            "never be invoked.");
+        return nullptr;
+    }
+
+    virtual void __clone(__base<_Rp(_ArgTypes...)>* __p) const {
+        ::new (__p) __func(__f_);
+    }
+
+    virtual void destroy() _NOEXCEPT {
+        if (__f_)
+            Block_release(__f_);
+        __f_ = 0;
+    }
+
+    virtual void destroy_deallocate() _NOEXCEPT {
+        _LIBCPP_ASSERT(false,
+            "Block pointers are just pointers, so they should always fit into "
+            "std::function's small buffer optimization. This function should "
+            "never be invoked.");
+    }
+
+    virtual _Rp operator()(_ArgTypes&& ... __arg) {
+        return __invoke(__f_, _VSTD::forward<_ArgTypes>(__arg)...);
+    }
+
+#ifndef _LIBCPP_NO_RTTI
+    virtual const void* target(type_info const& __ti) const _NOEXCEPT {
+        if (__ti == typeid(__func::__block_type))
+            return &__f_;
+        return (const void*)nullptr;
+    }
+
+    virtual const std::type_info& target_type() const _NOEXCEPT {
+        return typeid(__func::__block_type);
+    }
+#endif  // _LIBCPP_NO_RTTI
+};
+
+#endif  // _LIBCPP_HAS_EXTENSION_BLOCKS && !_LIBCPP_HAS_OBJC_ARC
+
 }  // __function
 
 template<class _Rp, class ..._ArgTypes>
@@ -2255,14 +2338,14 @@ class _LIBCPP_TEMPLATE_VIS function<_Rp(_ArgTypes...)>
 
     template <class _Fp, bool = _And<
         _IsNotSame<__uncvref_t<_Fp>, function>,
-        __invokable<_Fp&, _ArgTypes...>
+        __invokable<_Fp, _ArgTypes...>
     >::value>
     struct __callable;
     template <class _Fp>
         struct __callable<_Fp, true>
         {
             static const bool value = is_same<void, _Rp>::value ||
-                is_convertible<typename __invoke_of<_Fp&, _ArgTypes...>::type,
+                is_convertible<typename __invoke_of<_Fp, _ArgTypes...>::type,
                                _Rp>::value;
         };
     template <class _Fp>
@@ -2272,7 +2355,7 @@ class _LIBCPP_TEMPLATE_VIS function<_Rp(_ArgTypes...)>
         };
 
   template <class _Fp>
-  using _EnableIfCallable = typename enable_if<__callable<_Fp>::value>::type;
+  using _EnableIfLValueCallable = typename enable_if<__callable<_Fp&>::value>::type;
 public:
     typedef _Rp result_type;
 
@@ -2283,7 +2366,7 @@ public:
     function(nullptr_t) _NOEXCEPT {}
     function(const function&);
     function(function&&) _NOEXCEPT;
-    template<class _Fp, class = _EnableIfCallable<_Fp>>
+    template<class _Fp, class = _EnableIfLValueCallable<_Fp>>
     function(_Fp);
 
 #if _LIBCPP_STD_VER <= 14
@@ -2297,14 +2380,14 @@ public:
       function(allocator_arg_t, const _Alloc&, const function&);
     template<class _Alloc>
       function(allocator_arg_t, const _Alloc&, function&&);
-    template<class _Fp, class _Alloc, class = _EnableIfCallable<_Fp>>
+    template<class _Fp, class _Alloc, class = _EnableIfLValueCallable<_Fp>>
       function(allocator_arg_t, const _Alloc& __a, _Fp __f);
 #endif
 
     function& operator=(const function&);
     function& operator=(function&&) _NOEXCEPT;
     function& operator=(nullptr_t) _NOEXCEPT;
-    template<class _Fp, class = _EnableIfCallable<_Fp>>
+    template<class _Fp, class = _EnableIfLValueCallable<typename decay<_Fp>::type>>
     function& operator=(_Fp&&);
 
     ~function();
@@ -2967,14 +3050,14 @@ __search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
          forward_iterator_tag, forward_iterator_tag)
 {
     if (__first2 == __last2)
-        return make_pair(__first1, __first1);  // Everything matches an empty sequence
+        return _VSTD::make_pair(__first1, __first1);  // Everything matches an empty sequence
     while (true)
     {
         // Find first element in sequence 1 that matchs *__first2, with a mininum of loop checks
         while (true)
         {
             if (__first1 == __last1)  // return __last1 if no element matches *__first2
-                return make_pair(__last1, __last1);
+                return _VSTD::make_pair(__last1, __last1);
             if (__pred(*__first1, *__first2))
                 break;
             ++__first1;
@@ -2985,9 +3068,9 @@ __search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
         while (true)
         {
             if (++__m2 == __last2)  // If pattern exhausted, __first1 is the answer (works for 1 element pattern)
-                return make_pair(__first1, __m1);
+                return _VSTD::make_pair(__first1, __m1);
             if (++__m1 == __last1)  // Otherwise if source exhaused, pattern not found
-                return make_pair(__last1, __last1);
+                return _VSTD::make_pair(__last1, __last1);
             if (!__pred(*__m1, *__m2))  // if there is a mismatch, restart with a new __first1
             {
                 ++__first1;
@@ -3009,10 +3092,10 @@ __search(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1,
     // Take advantage of knowing source and pattern lengths.  Stop short when source is smaller than pattern
     const _D2 __len2 = __last2 - __first2;
     if (__len2 == 0)
-        return make_pair(__first1, __first1);
+        return _VSTD::make_pair(__first1, __first1);
     const _D1 __len1 = __last1 - __first1;
     if (__len1 < __len2)
-        return make_pair(__last1, __last1);
+        return _VSTD::make_pair(__last1, __last1);
     const _RandomAccessIterator1 __s = __last1 - (__len2 - 1);  // Start of pattern match can't go beyond here
 
     while (true)
@@ -3020,7 +3103,7 @@ __search(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1,
         while (true)
         {
             if (__first1 == __s)
-                return make_pair(__last1, __last1);
+                return _VSTD::make_pair(__last1, __last1);
             if (__pred(*__first1, *__first2))
                 break;
             ++__first1;
@@ -3031,7 +3114,7 @@ __search(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1,
          while (true)
          {
              if (++__m2 == __last2)
-                 return make_pair(__first1, __first1 + __len2);
+                 return _VSTD::make_pair(__first1, __first1 + __len2);
              ++__m1;          // no need to check range on __m1 because __s guarantees we have enough source
              if (!__pred(*__m1, *__m2))
              {
@@ -3080,15 +3163,19 @@ using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
 #endif // > C++17
 
 template <class _Container, class _Predicate>
-inline void __libcpp_erase_if_container( _Container& __c, _Predicate __pred)
-{
-	for (typename _Container::iterator __iter = __c.begin(), __last = __c.end(); __iter != __last;)
-	{
-		if (__pred(*__iter))
-			__iter = __c.erase(__iter);
-		else
-			++__iter;
-	}
+inline typename _Container::size_type
+__libcpp_erase_if_container(_Container& __c, _Predicate __pred) {
+  typename _Container::size_type __old_size = __c.size();
+
+  const typename _Container::iterator __last = __c.end();
+  for (typename _Container::iterator __iter = __c.begin(); __iter != __last;) {
+    if (__pred(*__iter))
+      __iter = __c.erase(__iter);
+    else
+      ++__iter;
+  }
+
+  return __old_size - __c.size();
 }
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/include/future b/gnu/llvm/libcxx/include/future
index 751d122a600..bdf74e3055c 100644
--- a/gnu/llvm/libcxx/include/future
+++ b/gnu/llvm/libcxx/include/future
@@ -506,6 +506,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY
     const error_code& code() const _NOEXCEPT {return __ec_;}
 
+    future_error(const future_error&) _NOEXCEPT = default;
     virtual ~future_error() _NOEXCEPT;
 };
 
diff --git a/gnu/llvm/libcxx/include/ios b/gnu/llvm/libcxx/include/ios
index 88efefb46ff..7f0e2d65e64 100644
--- a/gnu/llvm/libcxx/include/ios
+++ b/gnu/llvm/libcxx/include/ios
@@ -431,7 +431,8 @@ class _LIBCPP_EXCEPTION_ABI ios_base::failure
 public:
     explicit failure(const string& __msg, const error_code& __ec = io_errc::stream);
     explicit failure(const char* __msg, const error_code& __ec = io_errc::stream);
-    virtual ~failure() throw();
+    failure(const failure&) _NOEXCEPT = default;
+    virtual ~failure() _NOEXCEPT;
 };
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
@@ -842,7 +843,7 @@ basic_ios<_CharT, _Traits>::set_rdbuf(basic_streambuf<char_type, traits_type>* _
     ios_base::set_rdbuf(__sb);
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 boolalpha(ios_base& __str)
 {
@@ -850,7 +851,7 @@ boolalpha(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 noboolalpha(ios_base& __str)
 {
@@ -858,7 +859,7 @@ noboolalpha(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 showbase(ios_base& __str)
 {
@@ -866,7 +867,7 @@ showbase(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 noshowbase(ios_base& __str)
 {
@@ -874,7 +875,7 @@ noshowbase(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 showpoint(ios_base& __str)
 {
@@ -882,7 +883,7 @@ showpoint(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 noshowpoint(ios_base& __str)
 {
@@ -890,7 +891,7 @@ noshowpoint(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 showpos(ios_base& __str)
 {
@@ -898,7 +899,7 @@ showpos(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 noshowpos(ios_base& __str)
 {
@@ -906,7 +907,7 @@ noshowpos(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 skipws(ios_base& __str)
 {
@@ -914,7 +915,7 @@ skipws(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 noskipws(ios_base& __str)
 {
@@ -922,7 +923,7 @@ noskipws(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 uppercase(ios_base& __str)
 {
@@ -930,7 +931,7 @@ uppercase(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 nouppercase(ios_base& __str)
 {
@@ -938,7 +939,7 @@ nouppercase(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 unitbuf(ios_base& __str)
 {
@@ -946,7 +947,7 @@ unitbuf(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 nounitbuf(ios_base& __str)
 {
@@ -954,7 +955,7 @@ nounitbuf(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 internal(ios_base& __str)
 {
@@ -962,7 +963,7 @@ internal(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 left(ios_base& __str)
 {
@@ -970,7 +971,7 @@ left(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 right(ios_base& __str)
 {
@@ -978,7 +979,7 @@ right(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 dec(ios_base& __str)
 {
@@ -986,7 +987,7 @@ dec(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 hex(ios_base& __str)
 {
@@ -994,7 +995,7 @@ hex(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 oct(ios_base& __str)
 {
@@ -1002,7 +1003,7 @@ oct(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 fixed(ios_base& __str)
 {
@@ -1010,7 +1011,7 @@ fixed(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 scientific(ios_base& __str)
 {
@@ -1018,7 +1019,7 @@ scientific(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 hexfloat(ios_base& __str)
 {
@@ -1026,7 +1027,7 @@ hexfloat(ios_base& __str)
     return __str;
 }
 
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 ios_base&
 defaultfloat(ios_base& __str)
 {
diff --git a/gnu/llvm/libcxx/include/iterator b/gnu/llvm/libcxx/include/iterator
index 57dd055b4ac..a13214fca5e 100644
--- a/gnu/llvm/libcxx/include/iterator
+++ b/gnu/llvm/libcxx/include/iterator
@@ -54,10 +54,8 @@ struct bidirectional_iterator_tag : public forward_iterator_tag       {};
 struct random_access_iterator_tag : public bidirectional_iterator_tag {};
 
 // 27.4.3, iterator operations
-// extension: second argument not conforming to C++03
-template <class InputIterator>  // constexpr in C++17
-  constexpr void advance(InputIterator& i,
-             typename iterator_traits<InputIterator>::difference_type n);
+template <class InputIterator, class Distance>  // constexpr in C++17
+  constexpr void advance(InputIterator& i, Distance n);
 
 template <class InputIterator>  // constexpr in C++17
   constexpr typename iterator_traits<InputIterator>::difference_type
@@ -663,13 +661,14 @@ void __advance(_RandIter& __i,
    __i += __n;
 }
 
-template <class _InputIter>
+template <class _InputIter, class _Distance>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
-void advance(_InputIter& __i,
-             typename iterator_traits<_InputIter>::difference_type __n)
+void advance(_InputIter& __i, _Distance __orig_n)
 {
-    _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
-                       "Attempt to advance(it, -n) on a non-bidi iterator");
+    _LIBCPP_ASSERT(__orig_n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
+                   "Attempt to advance(it, n) with negative n on a non-bidirectional iterator");
+    typedef decltype(__convert_to_integral(__orig_n)) _IntegralSize;
+    _IntegralSize __n = __orig_n;
     __advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
 }
 
@@ -711,7 +710,7 @@ next(_InputIter __x,
      typename iterator_traits<_InputIter>::difference_type __n = 1)
 {
     _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
-                       "Attempt to next(it, -n) on a non-bidi iterator");
+                       "Attempt to next(it, n) with negative n on a non-bidirectional iterator");
 
     _VSTD::advance(__x, __n);
     return __x;
@@ -728,7 +727,7 @@ prev(_InputIter __x,
      typename iterator_traits<_InputIter>::difference_type __n = 1)
 {
     _LIBCPP_ASSERT(__n <= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
-                       "Attempt to prev(it, +n) on a non-bidi iterator");
+                       "Attempt to prev(it, n) with a positive n on a non-bidirectional iterator");
     _VSTD::advance(__x, -__n);
     return __x;
 }
diff --git a/gnu/llvm/libcxx/include/latch b/gnu/llvm/libcxx/include/latch
new file mode 100644
index 00000000000..f669f5860d3
--- /dev/null
+++ b/gnu/llvm/libcxx/include/latch
@@ -0,0 +1,104 @@
+// -*- C++ -*-
+//===--------------------------- latch -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_LATCH
+#define _LIBCPP_LATCH
+
+/*
+    latch synopsis
+
+namespace std
+{
+
+  class latch
+  {
+  public:
+    constexpr explicit latch(ptrdiff_t __expected);
+    ~latch();
+
+    latch(const latch&) = delete;
+    latch& operator=(const latch&) = delete;
+
+    void count_down(ptrdiff_t __update = 1);
+    bool try_wait() const noexcept;
+    void wait() const;
+    void arrive_and_wait(ptrdiff_t __update = 1);
+
+  private:
+    ptrdiff_t __counter; // exposition only
+  };
+
+}
+
+*/
+
+#include <__config>
+#include <atomic>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#ifdef _LIBCPP_HAS_NO_THREADS
+# error <latch> is not supported on this single threaded system
+#endif
+
+#if _LIBCPP_STD_VER >= 14
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+class latch
+{
+    __atomic_base<ptrdiff_t> __a;
+
+public:
+    static constexpr ptrdiff_t max() noexcept {
+        return numeric_limits<ptrdiff_t>::max();
+    }
+
+    inline _LIBCPP_INLINE_VISIBILITY
+    constexpr explicit latch(ptrdiff_t __expected) : __a(__expected) { }
+
+    ~latch() = default;
+    latch(const latch&) = delete;
+    latch& operator=(const latch&) = delete;
+
+    inline _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void count_down(ptrdiff_t __update = 1)
+    {
+        auto const __old = __a.fetch_sub(__update, memory_order_release);
+        if(__old == __update)
+            __a.notify_all();
+    }
+    inline _LIBCPP_INLINE_VISIBILITY
+    bool try_wait() const noexcept
+    {
+        return 0 == __a.load(memory_order_acquire);
+    }
+    inline _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void wait() const
+    {
+        auto const __test_fn = [=]() -> bool {
+            return try_wait();
+        };
+        __cxx_atomic_wait(&__a.__a_, __test_fn);
+    }
+    inline _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void arrive_and_wait(ptrdiff_t __update = 1)
+    {
+        count_down(__update);
+        wait();
+    }
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 14
+
+#endif //_LIBCPP_LATCH
diff --git a/gnu/llvm/libcxx/include/list b/gnu/llvm/libcxx/include/list
index ae318ead31d..55b45f1a67d 100644
--- a/gnu/llvm/libcxx/include/list
+++ b/gnu/llvm/libcxx/include/list
@@ -170,9 +170,11 @@ template <class T, class Alloc>
          noexcept(noexcept(x.swap(y)));
 
 template <class T, class Allocator, class U>
-    void erase(list<T, Allocator>& c, const U& value);       // C++20
+    typename list<T, Allocator>::size_type
+    erase(list<T, Allocator>& c, const U& value);       // C++20
 template <class T, class Allocator, class Predicate>
-    void erase_if(list<T, Allocator>& c, Predicate pred);    // C++20
+    typename list<T, Allocator>::size_type
+    erase_if(list<T, Allocator>& c, Predicate pred);    // C++20
 
 }  // std
 
@@ -2471,14 +2473,16 @@ swap(list<_Tp, _Alloc>& __x, list<_Tp, _Alloc>& __y)
 
 #if _LIBCPP_STD_VER > 17
 template <class _Tp, class _Allocator, class _Predicate>
-inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(list<_Tp, _Allocator>& __c, _Predicate __pred)
-{ __c.remove_if(__pred); }
+inline _LIBCPP_INLINE_VISIBILITY typename list<_Tp, _Allocator>::size_type
+erase_if(list<_Tp, _Allocator>& __c, _Predicate __pred) {
+  return __c.remove_if(__pred);
+}
 
 template <class _Tp, class _Allocator, class _Up>
-inline _LIBCPP_INLINE_VISIBILITY
-void erase(list<_Tp, _Allocator>& __c, const _Up& __v)
-{ _VSTD::erase_if(__c, [&](auto& __elem) { return __elem == __v; }); }
+inline _LIBCPP_INLINE_VISIBILITY typename list<_Tp, _Allocator>::size_type
+erase(list<_Tp, _Allocator>& __c, const _Up& __v) {
+  return _VSTD::erase_if(__c, [&](auto& __elem) { return __elem == __v; });
+}
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/include/map b/gnu/llvm/libcxx/include/map
index b6f89bf5ee5..d2b82591368 100644
--- a/gnu/llvm/libcxx/include/map
+++ b/gnu/llvm/libcxx/include/map
@@ -254,7 +254,8 @@ swap(map<Key, T, Compare, Allocator>& x, map<Key, T, Compare, Allocator>& y)
     noexcept(noexcept(x.swap(y)));
 
 template <class Key, class T, class Compare, class Allocator, class Predicate>
-  void erase_if(map<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20
+typename map<Key, T, Compare, Allocator>::size_type
+erase_if(map<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20
 
 
 template <class Key, class T, class Compare = less<Key>,
@@ -469,7 +470,8 @@ swap(multimap<Key, T, Compare, Allocator>& x,
     noexcept(noexcept(x.swap(y)));
 
 template <class Key, class T, class Compare, class Allocator, class Predicate>
-  void erase_if(multimap<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20
+typename multimap<Key, T, Compare, Allocator>::size_type
+erase_if(multimap<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20
 
 }  // std
 
@@ -1653,10 +1655,13 @@ swap(map<_Key, _Tp, _Compare, _Allocator>& __x,
 }
 
 #if _LIBCPP_STD_VER > 17
-template <class _Key, class _Tp, class _Compare, class _Allocator, class _Predicate>
+template <class _Key, class _Tp, class _Compare, class _Allocator,
+          class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(map<_Key, _Tp, _Compare, _Allocator>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename map<_Key, _Tp, _Compare, _Allocator>::size_type
+    erase_if(map<_Key, _Tp, _Compare, _Allocator>& __c, _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 
@@ -2235,10 +2240,14 @@ swap(multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 }
 
 #if _LIBCPP_STD_VER > 17
-template <class _Key, class _Tp, class _Compare, class _Allocator, class _Predicate>
+template <class _Key, class _Tp, class _Compare, class _Allocator,
+          class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(multimap<_Key, _Tp, _Compare, _Allocator>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename multimap<_Key, _Tp, _Compare, _Allocator>::size_type
+    erase_if(multimap<_Key, _Tp, _Compare, _Allocator>& __c,
+             _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/include/memory b/gnu/llvm/libcxx/include/memory
index 34c3e0c0d8d..1f9f36c5bbb 100644
--- a/gnu/llvm/libcxx/include/memory
+++ b/gnu/llvm/libcxx/include/memory
@@ -80,7 +80,7 @@ struct allocator_traits
     typedef Alloc::is_always_equal
           | is_empty                     is_always_equal;
 
-    template <class T> using rebind_alloc  = Alloc::rebind<U>::other | Alloc<T, Args...>;
+    template <class T> using rebind_alloc  = Alloc::rebind<T>::other | Alloc<T, Args...>;
     template <class T> using rebind_traits = allocator_traits<rebind_alloc<T>>;
 
     static pointer allocate(allocator_type& a, size_type n);                          // [[nodiscard]] in C++20
@@ -101,7 +101,7 @@ struct allocator_traits
 };
 
 template <>
-class allocator<void>
+class allocator<void> // deprecated in C++17, removed in C++20
 {
 public:
     typedef void*                                 pointer;
@@ -115,30 +115,37 @@ template <class T>
 class allocator
 {
 public:
-    typedef size_t                                size_type;
-    typedef ptrdiff_t                             difference_type;
-    typedef T*                                    pointer;
-    typedef const T*                              const_pointer;
-    typedef typename add_lvalue_reference<T>::type       reference;
-    typedef typename add_lvalue_reference<const T>::type const_reference;
-    typedef T                                     value_type;
+    typedef size_t    size_type;                         // deprecated in C++17, removed in C++20
+    typedef ptrdiff_t difference_type;                   // deprecated in C++17, removed in C++20
+    typedef T*        pointer;                           // deprecated in C++17, removed in C++20
+    typedef const T*  const_pointer;                     // deprecated in C++17, removed in C++20
+    typedef typename add_lvalue_reference<T>::type
+                      reference;                         // deprecated in C++17, removed in C++20
+    typedef typename add_lvalue_reference<const T>::type
+                      const_reference;                   // deprecated in C++17, removed in C++20
 
-    template <class U> struct rebind {typedef allocator<U> other;};
+    typedef T         value_type;
+
+    template <class U> struct rebind {typedef allocator<U> other;}; // deprecated in C++17, removed in C++20
+
+    typedef true_type propagate_on_container_move_assignment;
+    typedef true_type is_always_equal;
 
     constexpr allocator() noexcept;                      // constexpr in C++20
     constexpr allocator(const allocator&) noexcept;      // constexpr in C++20
     template <class U>
       constexpr allocator(const allocator<U>&) noexcept; // constexpr in C++20
     ~allocator();
-    pointer address(reference x) const noexcept;
-    const_pointer address(const_reference x) const noexcept;
-    pointer allocate(size_type, allocator<void>::const_pointer hint = 0);
-    void deallocate(pointer p, size_type n) noexcept;
-    size_type max_size() const noexcept;
+    pointer address(reference x) const noexcept;             // deprecated in C++17, removed in C++20
+    const_pointer address(const_reference x) const noexcept; // deprecated in C++17, removed in C++20
+    T* allocate(size_t n, const void* hint);          // deprecated in C++17, removed in C++20
+    T* allocate(size_t n);
+    void deallocate(T* p, size_t n) noexcept;
+    size_type max_size() const noexcept;              // deprecated in C++17, removed in C++20
     template<class U, class... Args>
-        void construct(U* p, Args&&... args);
+        void construct(U* p, Args&&... args);         // deprecated in C++17, removed in C++20
     template <class U>
-        void destroy(U* p);
+        void destroy(U* p);                           // deprecated in C++17, removed in C++20
 };
 
 template <class T, class U>
@@ -443,6 +450,11 @@ public:
     template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept;
 };
 
+template<class T>
+shared_ptr(weak_ptr<T>) -> shared_ptr<T>;
+template<class T, class D>
+shared_ptr(unique_ptr<T, D>) -> shared_ptr<T>;
+
 // shared_ptr comparisons:
 template<class T, class U>
     bool operator==(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
@@ -541,6 +553,9 @@ public:
     template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept;
 };
 
+template<class T>
+weak_ptr(shared_ptr<T>) -> weak_ptr<T>;
+
 // weak_ptr specialized algorithms:
 template<class T> void swap(weak_ptr<T>& a, weak_ptr<T>& b) noexcept;
 
@@ -705,8 +720,9 @@ _ValueType __libcpp_acquire_load(_ValueType const* __value) {
 
 template <class _Tp> class allocator;
 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
 template <>
-class _LIBCPP_TEMPLATE_VIS allocator<void>
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 allocator<void>
 {
 public:
     typedef void*             pointer;
@@ -717,7 +733,7 @@ public:
 };
 
 template <>
-class _LIBCPP_TEMPLATE_VIS allocator<const void>
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 allocator<const void>
 {
 public:
     typedef const void*       pointer;
@@ -726,6 +742,7 @@ public:
 
     template <class _Up> struct rebind {typedef allocator<_Up> other;};
 };
+#endif
 
 // pointer_traits
 
@@ -838,7 +855,9 @@ struct __has_rebind
 private:
     struct __two {char __lx; char __lxx;};
     template <class _Xp> static __two __test(...);
+    _LIBCPP_SUPPRESS_DEPRECATED_PUSH
     template <class _Xp> static char __test(typename _Xp::template rebind<_Up>* = 0);
+    _LIBCPP_SUPPRESS_DEPRECATED_POP
 public:
     static const bool value = sizeof(__test<_Tp>(0)) == 1;
 };
@@ -1266,7 +1285,9 @@ struct __has_rebind_other
 private:
     struct __two {char __lx; char __lxx;};
     template <class _Xp> static __two __test(...);
+    _LIBCPP_SUPPRESS_DEPRECATED_PUSH
     template <class _Xp> static char __test(typename _Xp::template rebind<_Up>::other* = 0);
+    _LIBCPP_SUPPRESS_DEPRECATED_POP
 public:
     static const bool value = sizeof(__test<_Tp>(0)) == 1;
 };
@@ -1280,15 +1301,17 @@ struct __has_rebind_other<_Tp, _Up, false>
 template <class _Tp, class _Up, bool = __has_rebind_other<_Tp, _Up>::value>
 struct __allocator_traits_rebind
 {
+    _LIBCPP_SUPPRESS_DEPRECATED_PUSH
     typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up>::other type;
+    _LIBCPP_SUPPRESS_DEPRECATED_POP
 };
 
-#ifndef _LIBCPP_HAS_NO_VARIADICS
-
 template <template <class, class...> class _Alloc, class _Tp, class ..._Args, class _Up>
 struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, true>
 {
+    _LIBCPP_SUPPRESS_DEPRECATED_PUSH
     typedef _LIBCPP_NODEBUG_TYPE typename _Alloc<_Tp, _Args...>::template rebind<_Up>::other type;
+    _LIBCPP_SUPPRESS_DEPRECATED_POP
 };
 
 template <template <class, class...> class _Alloc, class _Tp, class ..._Args, class _Up>
@@ -1297,68 +1320,14 @@ struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, false>
     typedef _LIBCPP_NODEBUG_TYPE _Alloc<_Up, _Args...> type;
 };
 
-#else  // _LIBCPP_HAS_NO_VARIADICS
-
-template <template <class> class _Alloc, class _Tp, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp>, _Up, true>
-{
-    typedef typename _Alloc<_Tp>::template rebind<_Up>::other type;
-};
-
-template <template <class> class _Alloc, class _Tp, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp>, _Up, false>
-{
-    typedef _Alloc<_Up> type;
-};
-
-template <template <class, class> class _Alloc, class _Tp, class _A0, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp, _A0>, _Up, true>
-{
-    typedef typename _Alloc<_Tp, _A0>::template rebind<_Up>::other type;
-};
-
-template <template <class, class> class _Alloc, class _Tp, class _A0, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp, _A0>, _Up, false>
-{
-    typedef _Alloc<_Up, _A0> type;
-};
-
-template <template <class, class, class> class _Alloc, class _Tp, class _A0,
-                                         class _A1, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp, _A0, _A1>, _Up, true>
-{
-    typedef typename _Alloc<_Tp, _A0, _A1>::template rebind<_Up>::other type;
-};
-
-template <template <class, class, class> class _Alloc, class _Tp, class _A0,
-                                         class _A1, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp, _A0, _A1>, _Up, false>
-{
-    typedef _Alloc<_Up, _A0, _A1> type;
-};
-
-template <template <class, class, class, class> class _Alloc, class _Tp, class _A0,
-                                                class _A1, class _A2, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp, _A0, _A1, _A2>, _Up, true>
-{
-    typedef typename _Alloc<_Tp, _A0, _A1, _A2>::template rebind<_Up>::other type;
-};
-
-template <template <class, class, class, class> class _Alloc, class _Tp, class _A0,
-                                                class _A1, class _A2, class _Up>
-struct __allocator_traits_rebind<_Alloc<_Tp, _A0, _A1, _A2>, _Up, false>
-{
-    typedef _Alloc<_Up, _A0, _A1, _A2> type;
-};
-
-#endif  // _LIBCPP_HAS_NO_VARIADICS
-
 #ifndef _LIBCPP_CXX03_LANG
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Alloc, class _SizeType, class _ConstVoidPtr>
 auto
 __has_allocate_hint_test(_Alloc&& __a, _SizeType&& __sz, _ConstVoidPtr&& __p)
     -> decltype((void)__a.allocate(__sz, __p), true_type());
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 template <class _Alloc, class _SizeType, class _ConstVoidPtr>
 auto
@@ -1367,12 +1336,9 @@ __has_allocate_hint_test(const _Alloc& __a, _SizeType&& __sz, _ConstVoidPtr&& __
 
 template <class _Alloc, class _SizeType, class _ConstVoidPtr>
 struct __has_allocate_hint
-    : integral_constant<bool,
-        is_same<
-            decltype(_VSTD::__has_allocate_hint_test(declval<_Alloc>(),
-                                          declval<_SizeType>(),
-                                          declval<_ConstVoidPtr>())),
-            true_type>::value>
+    : decltype(_VSTD::__has_allocate_hint_test(declval<_Alloc>(),
+                                               declval<_SizeType>(),
+                                               declval<_ConstVoidPtr>()))
 {
 };
 
@@ -1386,33 +1352,26 @@ struct __has_allocate_hint
 
 #endif  // _LIBCPP_CXX03_LANG
 
-#if !defined(_LIBCPP_CXX03_LANG)
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
+template <class _Alloc, class ..._Args,
+    class = decltype(_VSTD::declval<_Alloc>().construct(_VSTD::declval<_Args>()...))>
+static true_type __test_has_construct(int);
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
-template <class _Alloc, class _Tp, class ..._Args>
-decltype(_VSTD::declval<_Alloc>().construct(_VSTD::declval<_Tp*>(),
-                                           _VSTD::declval<_Args>()...),
-                                           true_type())
-__has_construct_test(_Alloc&& __a, _Tp* __p, _Args&& ...__args);
-
-template <class _Alloc, class _Pointer, class ..._Args>
-false_type
-__has_construct_test(const _Alloc& __a, _Pointer&& __p, _Args&& ...__args);
-
-template <class _Alloc, class _Pointer, class ..._Args>
-struct __has_construct
-    : integral_constant<bool,
-        is_same<
-            decltype(_VSTD::__has_construct_test(declval<_Alloc>(),
-                                          declval<_Pointer>(),
-                                          declval<_Args>()...)),
-            true_type>::value>
-{
-};
+template <class _Alloc, class...>
+static false_type __test_has_construct(...);
+
+template <class _Alloc, class ..._Args>
+struct __has_construct : decltype(__test_has_construct<_Alloc, _Args...>(0)) {};
+
+#if !defined(_LIBCPP_CXX03_LANG)
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Alloc, class _Pointer>
 auto
 __has_destroy_test(_Alloc&& __a, _Pointer&& __p)
     -> decltype(__a.destroy(__p), true_type());
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 template <class _Alloc, class _Pointer>
 auto
@@ -1421,18 +1380,17 @@ __has_destroy_test(const _Alloc& __a, _Pointer&& __p)
 
 template <class _Alloc, class _Pointer>
 struct __has_destroy
-    : integral_constant<bool,
-        is_same<
-            decltype(_VSTD::__has_destroy_test(declval<_Alloc>(),
-                                        declval<_Pointer>())),
-            true_type>::value>
+    : decltype(_VSTD::__has_destroy_test(declval<_Alloc>(),
+                                         declval<_Pointer>()))
 {
 };
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Alloc>
 auto
 __has_max_size_test(_Alloc&& __a)
     -> decltype(__a.max_size(), true_type());
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 template <class _Alloc>
 auto
@@ -1441,10 +1399,7 @@ __has_max_size_test(const volatile _Alloc& __a)
 
 template <class _Alloc>
 struct __has_max_size
-    : integral_constant<bool,
-        is_same<
-            decltype(_VSTD::__has_max_size_test(declval<_Alloc&>())),
-            true_type>::value>
+    : decltype(_VSTD::__has_max_size_test(declval<_Alloc&>()))
 {
 };
 
@@ -1460,23 +1415,12 @@ __has_select_on_container_copy_construction_test(const volatile _Alloc& __a)
 
 template <class _Alloc>
 struct __has_select_on_container_copy_construction
-    : integral_constant<bool,
-        is_same<
-            decltype(_VSTD::__has_select_on_container_copy_construction_test(declval<_Alloc&>())),
-            true_type>::value>
+    : decltype(_VSTD::__has_select_on_container_copy_construction_test(declval<_Alloc&>()))
 {
 };
 
 #else  // _LIBCPP_CXX03_LANG
 
-template <class _Alloc, class _Pointer, class _Tp, class = void>
-struct __has_construct : std::false_type {};
-
-template <class _Alloc, class _Pointer, class _Tp>
-struct __has_construct<_Alloc, _Pointer, _Tp, typename __void_t<
-    decltype(_VSTD::declval<_Alloc>().construct(_VSTD::declval<_Pointer>(), _VSTD::declval<_Tp>()))
->::type> : std::true_type {};
-
 template <class _Alloc, class _Pointer, class = void>
 struct __has_destroy : false_type {};
 
@@ -1588,41 +1532,11 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
     static void deallocate(allocator_type& __a, pointer __p, size_type __n) _NOEXCEPT
         {__a.deallocate(__p, __n);}
 
-#ifndef _LIBCPP_HAS_NO_VARIADICS
     template <class _Tp, class... _Args>
         _LIBCPP_INLINE_VISIBILITY
         static void construct(allocator_type& __a, _Tp* __p, _Args&&... __args)
             {__construct(__has_construct<allocator_type, _Tp*, _Args...>(),
                          __a, __p, _VSTD::forward<_Args>(__args)...);}
-#else  // _LIBCPP_HAS_NO_VARIADICS
-    template <class _Tp>
-        _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type&, _Tp* __p)
-            {
-                ::new ((void*)__p) _Tp();
-            }
-    template <class _Tp, class _A0>
-        _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0)
-            {
-                __construct(__has_construct<allocator_type, _Tp*, const _A0&>(),
-                            __a, __p, __a0);
-            }
-    template <class _Tp, class _A0, class _A1>
-        _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type&, _Tp* __p, const _A0& __a0,
-                              const _A1& __a1)
-            {
-                ::new ((void*)__p) _Tp(__a0, __a1);
-            }
-    template <class _Tp, class _A0, class _A1, class _A2>
-        _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type&, _Tp* __p, const _A0& __a0,
-                              const _A1& __a1, const _A2& __a2)
-            {
-                ::new ((void*)__p) _Tp(__a0, __a1, __a2);
-            }
-#endif  // _LIBCPP_HAS_NO_VARIADICS
 
     template <class _Tp>
         _LIBCPP_INLINE_VISIBILITY
@@ -1695,7 +1609,7 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
         static
         typename enable_if
         <
-            is_trivially_move_constructible<_DestTp>::value &&
+            is_trivially_copy_constructible<_DestTp>::value &&
             is_same<_RawSourceTp, _RawDestTp>::value &&
             (__is_default_allocator<allocator_type>::value ||
              !__has_construct<allocator_type, _DestTp*, _SourceTp&>::value),
@@ -1755,42 +1669,40 @@ private:
     _LIBCPP_INLINE_VISIBILITY
     static pointer __allocate(allocator_type& __a, size_type __n,
         const_void_pointer __hint, true_type)
-        {return __a.allocate(__n, __hint);}
+        {
+            _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+            return __a.allocate(__n, __hint);
+            _LIBCPP_SUPPRESS_DEPRECATED_POP
+        }
     _LIBCPP_INLINE_VISIBILITY
     static pointer __allocate(allocator_type& __a, size_type __n,
         const_void_pointer, false_type)
         {return __a.allocate(__n);}
 
-#ifndef _LIBCPP_HAS_NO_VARIADICS
     template <class _Tp, class... _Args>
         _LIBCPP_INLINE_VISIBILITY
         static void __construct(true_type, allocator_type& __a, _Tp* __p, _Args&&... __args)
-            {__a.construct(__p, _VSTD::forward<_Args>(__args)...);}
+            {
+                _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+                __a.construct(__p, _VSTD::forward<_Args>(__args)...);
+                _LIBCPP_SUPPRESS_DEPRECATED_POP
+            }
+
     template <class _Tp, class... _Args>
         _LIBCPP_INLINE_VISIBILITY
         static void __construct(false_type, allocator_type&, _Tp* __p, _Args&&... __args)
             {
                 ::new ((void*)__p) _Tp(_VSTD::forward<_Args>(__args)...);
             }
-#else  // _LIBCPP_HAS_NO_VARIADICS
-    template <class _Tp, class _A0>
-        _LIBCPP_INLINE_VISIBILITY
-        static void __construct(true_type, allocator_type& __a, _Tp* __p,
-                                const _A0& __a0)
-            {__a.construct(__p, __a0);}
-    template <class _Tp, class _A0>
-        _LIBCPP_INLINE_VISIBILITY
-        static void __construct(false_type, allocator_type&, _Tp* __p,
-                                const _A0& __a0)
-            {
-                ::new ((void*)__p) _Tp(__a0);
-            }
-#endif  // _LIBCPP_HAS_NO_VARIADICS
 
     template <class _Tp>
         _LIBCPP_INLINE_VISIBILITY
         static void __destroy(true_type, allocator_type& __a, _Tp* __p)
-            {__a.destroy(__p);}
+            {
+                _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+                __a.destroy(__p);
+                _LIBCPP_SUPPRESS_DEPRECATED_POP
+            }
     template <class _Tp>
         _LIBCPP_INLINE_VISIBILITY
         static void __destroy(false_type, allocator_type&, _Tp* __p)
@@ -1800,7 +1712,12 @@ private:
 
     _LIBCPP_INLINE_VISIBILITY
     static size_type __max_size(true_type, const allocator_type& __a) _NOEXCEPT
-            {return __a.max_size();}
+            {
+                _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+                return __a.max_size();
+                _LIBCPP_SUPPRESS_DEPRECATED_POP
+            }
+
     _LIBCPP_INLINE_VISIBILITY
     static size_type __max_size(false_type, const allocator_type&) _NOEXCEPT
             {return numeric_limits<size_type>::max() / sizeof(value_type);}
@@ -1831,19 +1748,22 @@ template <class _Tp>
 class _LIBCPP_TEMPLATE_VIS allocator
 {
 public:
-    typedef size_t            size_type;
-    typedef ptrdiff_t         difference_type;
-    typedef _Tp*              pointer;
-    typedef const _Tp*        const_pointer;
-    typedef _Tp&              reference;
-    typedef const _Tp&        const_reference;
-    typedef _Tp               value_type;
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t     size_type;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef ptrdiff_t  difference_type;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp*       pointer;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* const_pointer;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp&       reference;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& const_reference;
+
+    template <class _Up> struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {typedef allocator<_Up> other;};
+#endif
+
+    typedef _Tp value_type;
 
     typedef true_type propagate_on_container_move_assignment;
     typedef true_type is_always_equal;
 
-    template <class _Up> struct rebind {typedef allocator<_Up> other;};
-
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
     allocator() _NOEXCEPT {}
 
@@ -1851,103 +1771,67 @@ public:
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
     allocator(const allocator<_Up>&) _NOEXCEPT {}
 
-    _LIBCPP_INLINE_VISIBILITY pointer address(reference __x) const _NOEXCEPT
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
+    pointer address(reference __x) const _NOEXCEPT
         {return _VSTD::addressof(__x);}
-    _LIBCPP_INLINE_VISIBILITY const_pointer address(const_reference __x) const _NOEXCEPT
+    _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
+    const_pointer address(const_reference __x) const _NOEXCEPT
         {return _VSTD::addressof(__x);}
-    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
-    pointer allocate(size_type __n, allocator<void>::const_pointer = 0)
+#endif
+
+    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _Tp* allocate(size_t __n)
         {
-        if (__n > max_size())
+        // TODO(mpark): Replace with `allocator_traits<allocator>::max_size(*this)`.
+        if (__n > (size_t(~0) / sizeof(_Tp)))
             __throw_length_error("allocator<T>::allocate(size_t n)"
                                  " 'n' exceeds maximum supported size");
-        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
+        return static_cast<_Tp*>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
         }
-    _LIBCPP_INLINE_VISIBILITY void deallocate(pointer __p, size_type __n) _NOEXCEPT
+
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_IN_CXX17
+    _Tp* allocate(size_t __n, const void*) { return allocate(__n); }
+#endif
+
+    _LIBCPP_INLINE_VISIBILITY void deallocate(_Tp* __p, size_t __n) _NOEXCEPT
         {_VSTD::__libcpp_deallocate((void*)__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));}
-    _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT
+
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT
         {return size_type(~0) / sizeof(_Tp);}
-#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
+
     template <class _Up, class... _Args>
-        _LIBCPP_INLINE_VISIBILITY
+        _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
         void
         construct(_Up* __p, _Args&&... __args)
         {
             ::new((void*)__p) _Up(_VSTD::forward<_Args>(__args)...);
         }
-#else  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
-        _LIBCPP_INLINE_VISIBILITY
-        void
-        construct(pointer __p)
-        {
-            ::new((void*)__p) _Tp();
-        }
-# if defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
-
-    template <class _A0>
-        _LIBCPP_INLINE_VISIBILITY
-        void
-        construct(pointer __p, _A0& __a0)
-        {
-            ::new((void*)__p) _Tp(__a0);
-        }
-    template <class _A0>
-        _LIBCPP_INLINE_VISIBILITY
-        void
-        construct(pointer __p, const _A0& __a0)
-        {
-            ::new((void*)__p) _Tp(__a0);
-        }
-# endif  // defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
-    template <class _A0, class _A1>
-        _LIBCPP_INLINE_VISIBILITY
-        void
-        construct(pointer __p, _A0& __a0, _A1& __a1)
-        {
-            ::new((void*)__p) _Tp(__a0, __a1);
-        }
-    template <class _A0, class _A1>
-        _LIBCPP_INLINE_VISIBILITY
-        void
-        construct(pointer __p, const _A0& __a0, _A1& __a1)
-        {
-            ::new((void*)__p) _Tp(__a0, __a1);
-        }
-    template <class _A0, class _A1>
-        _LIBCPP_INLINE_VISIBILITY
-        void
-        construct(pointer __p, _A0& __a0, const _A1& __a1)
-        {
-            ::new((void*)__p) _Tp(__a0, __a1);
-        }
-    template <class _A0, class _A1>
-        _LIBCPP_INLINE_VISIBILITY
-        void
-        construct(pointer __p, const _A0& __a0, const _A1& __a1)
-        {
-            ::new((void*)__p) _Tp(__a0, __a1);
-        }
-#endif  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
-    _LIBCPP_INLINE_VISIBILITY void destroy(pointer __p) {__p->~_Tp();}
+    _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY void destroy(pointer __p) {__p->~_Tp();}
+#endif
 };
 
 template <class _Tp>
 class _LIBCPP_TEMPLATE_VIS allocator<const _Tp>
 {
 public:
-    typedef size_t            size_type;
-    typedef ptrdiff_t         difference_type;
-    typedef const _Tp*        pointer;
-    typedef const _Tp*        const_pointer;
-    typedef const _Tp&        reference;
-    typedef const _Tp&        const_reference;
-    typedef const _Tp         value_type;
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t     size_type;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef ptrdiff_t  difference_type;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* pointer;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* const_pointer;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& reference;
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& const_reference;
+
+    template <class _Up> struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {typedef allocator<_Up> other;};
+#endif
+
+    typedef const _Tp value_type;
 
     typedef true_type propagate_on_container_move_assignment;
     typedef true_type is_always_equal;
 
-    template <class _Up> struct rebind {typedef allocator<_Up> other;};
-
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
     allocator() _NOEXCEPT {}
 
@@ -1955,22 +1839,36 @@ public:
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
     allocator(const allocator<_Up>&) _NOEXCEPT {}
 
-    _LIBCPP_INLINE_VISIBILITY const_pointer address(const_reference __x) const _NOEXCEPT
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
+    const_pointer address(const_reference __x) const _NOEXCEPT
         {return _VSTD::addressof(__x);}
-    _LIBCPP_INLINE_VISIBILITY pointer allocate(size_type __n, allocator<void>::const_pointer = 0)
+#endif
+
+    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY const _Tp* allocate(size_t __n)
     {
-        if (__n > max_size())
+        // TODO(mpark): Replace with `allocator_traits<allocator>::max_size(*this)`.
+        if (__n > (size_t(~0) / sizeof(_Tp)))
             __throw_length_error("allocator<const T>::allocate(size_t n)"
                                  " 'n' exceeds maximum supported size");
-        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
+        return static_cast<const _Tp*>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
     }
-    _LIBCPP_INLINE_VISIBILITY void deallocate(pointer __p, size_type __n) _NOEXCEPT
+
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_IN_CXX17
+    const _Tp* allocate(size_t __n, const void*) { return allocate(__n); }
+#endif
+
+    _LIBCPP_INLINE_VISIBILITY void deallocate(const _Tp* __p, size_t __n)
         {_VSTD::__libcpp_deallocate((void*) const_cast<_Tp *>(__p), __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));}
-    _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT
+
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
+    _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT
         {return size_type(~0) / sizeof(_Tp);}
+
 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
     template <class _Up, class... _Args>
-        _LIBCPP_INLINE_VISIBILITY
+        _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
         void
         construct(_Up* __p, _Args&&... __args)
         {
@@ -2029,7 +1927,8 @@ public:
             ::new((void*) const_cast<_Tp *>(__p)) _Tp(__a0, __a1);
         }
 #endif  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
-    _LIBCPP_INLINE_VISIBILITY void destroy(pointer __p) {__p->~_Tp();}
+    _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY void destroy(pointer __p) {__p->~_Tp();}
+#endif
 };
 
 template <class _Tp, class _Up>
@@ -2134,39 +2033,39 @@ private:
 public:
     typedef _Tp element_type;
 
-    _LIBCPP_INLINE_VISIBILITY explicit auto_ptr(_Tp* __p = 0) throw() : __ptr_(__p) {}
-    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr& __p) throw() : __ptr_(__p.release()) {}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr<_Up>& __p) throw()
+    _LIBCPP_INLINE_VISIBILITY explicit auto_ptr(_Tp* __p = 0) _NOEXCEPT : __ptr_(__p) {}
+    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr& __p) _NOEXCEPT : __ptr_(__p.release()) {}
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr<_Up>& __p) _NOEXCEPT
         : __ptr_(__p.release()) {}
-    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr& __p) throw()
+    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr& __p) _NOEXCEPT
         {reset(__p.release()); return *this;}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr<_Up>& __p) throw()
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr<_Up>& __p) _NOEXCEPT
         {reset(__p.release()); return *this;}
-    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr_ref<_Tp> __p) throw()
+    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr_ref<_Tp> __p) _NOEXCEPT
         {reset(__p.__ptr_); return *this;}
-    _LIBCPP_INLINE_VISIBILITY ~auto_ptr() throw() {delete __ptr_;}
+    _LIBCPP_INLINE_VISIBILITY ~auto_ptr() _NOEXCEPT {delete __ptr_;}
 
-    _LIBCPP_INLINE_VISIBILITY _Tp& operator*() const throw()
+    _LIBCPP_INLINE_VISIBILITY _Tp& operator*() const _NOEXCEPT
         {return *__ptr_;}
-    _LIBCPP_INLINE_VISIBILITY _Tp* operator->() const throw() {return __ptr_;}
-    _LIBCPP_INLINE_VISIBILITY _Tp* get() const throw() {return __ptr_;}
-    _LIBCPP_INLINE_VISIBILITY _Tp* release() throw()
+    _LIBCPP_INLINE_VISIBILITY _Tp* operator->() const _NOEXCEPT {return __ptr_;}
+    _LIBCPP_INLINE_VISIBILITY _Tp* get() const _NOEXCEPT {return __ptr_;}
+    _LIBCPP_INLINE_VISIBILITY _Tp* release() _NOEXCEPT
     {
         _Tp* __t = __ptr_;
         __ptr_ = 0;
         return __t;
     }
-    _LIBCPP_INLINE_VISIBILITY void reset(_Tp* __p = 0) throw()
+    _LIBCPP_INLINE_VISIBILITY void reset(_Tp* __p = 0) _NOEXCEPT
     {
         if (__ptr_ != __p)
             delete __ptr_;
         __ptr_ = __p;
     }
 
-    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr_ref<_Tp> __p) throw() : __ptr_(__p.__ptr_) {}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr_ref<_Up>() throw()
+    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr_ref<_Tp> __p) _NOEXCEPT : __ptr_(__p.__ptr_) {}
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr_ref<_Up>() _NOEXCEPT
         {auto_ptr_ref<_Up> __t; __t.__ptr_ = release(); return __t;}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr<_Up>() throw()
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr<_Up>() _NOEXCEPT
         {return auto_ptr<_Up>(release());}
 };
 
@@ -3393,6 +3292,8 @@ class _LIBCPP_EXCEPTION_ABI bad_weak_ptr
     : public std::exception
 {
 public:
+    bad_weak_ptr() _NOEXCEPT = default;
+    bad_weak_ptr(const bad_weak_ptr&) _NOEXCEPT = default;
     virtual ~bad_weak_ptr() _NOEXCEPT;
     virtual const char* what() const  _NOEXCEPT;
 };
@@ -3628,15 +3529,25 @@ public:
 
 template<class _Tp> class _LIBCPP_TEMPLATE_VIS enable_shared_from_this;
 
+template<class _Tp, class _Up>
+struct __compatible_with
+#if _LIBCPP_STD_VER > 14
+    : is_convertible<remove_extent_t<_Tp>*, remove_extent_t<_Up>*> {};
+#else
+    : is_convertible<_Tp*, _Up*> {};
+#endif // _LIBCPP_STD_VER > 14
+
 template<class _Tp>
 class _LIBCPP_TEMPLATE_VIS shared_ptr
 {
 public:
-    typedef _Tp element_type;
-
 #if _LIBCPP_STD_VER > 14
     typedef weak_ptr<_Tp> weak_type;
+    typedef remove_extent_t<_Tp> element_type;
+#else
+    typedef _Tp element_type;
 #endif
+
 private:
     element_type*      __ptr_;
     __shared_weak_count* __cntrl_;
@@ -3649,13 +3560,13 @@ public:
     _LIBCPP_CONSTEXPR shared_ptr(nullptr_t) _NOEXCEPT;
     template<class _Yp>
         explicit shared_ptr(_Yp* __p,
-                            typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type = __nat());
+                            typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type = __nat());
     template<class _Yp, class _Dp>
         shared_ptr(_Yp* __p, _Dp __d,
-                   typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type = __nat());
+                   typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type = __nat());
     template<class _Yp, class _Dp, class _Alloc>
         shared_ptr(_Yp* __p, _Dp __d, _Alloc __a,
-                   typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type = __nat());
+                   typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type = __nat());
     template <class _Dp> shared_ptr(nullptr_t __p, _Dp __d);
     template <class _Dp, class _Alloc> shared_ptr(nullptr_t __p, _Dp __d, _Alloc __a);
     template<class _Yp> _LIBCPP_INLINE_VISIBILITY shared_ptr(const shared_ptr<_Yp>& __r, element_type* __p) _NOEXCEPT;
@@ -3664,13 +3575,13 @@ public:
     template<class _Yp>
         _LIBCPP_INLINE_VISIBILITY
         shared_ptr(const shared_ptr<_Yp>& __r,
-                   typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type = __nat())
+                   typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type = __nat())
                        _NOEXCEPT;
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     _LIBCPP_INLINE_VISIBILITY
     shared_ptr(shared_ptr&& __r) _NOEXCEPT;
     template<class _Yp> _LIBCPP_INLINE_VISIBILITY  shared_ptr(shared_ptr<_Yp>&& __r,
-                   typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type = __nat())
+                   typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type = __nat())
                        _NOEXCEPT;
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     template<class _Yp> explicit shared_ptr(const weak_ptr<_Yp>& __r,
@@ -3686,7 +3597,6 @@ public:
                    typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type = __nat());
 #endif
 #endif
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     template <class _Yp, class _Dp>
         shared_ptr(unique_ptr<_Yp, _Dp>&&,
                    typename enable_if
@@ -3705,26 +3615,6 @@ public:
                        is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value,
                        __nat
                    >::type = __nat());
-#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
-    template <class _Yp, class _Dp>
-        shared_ptr(unique_ptr<_Yp, _Dp>,
-                   typename enable_if
-                   <
-                       !is_lvalue_reference<_Dp>::value &&
-                       !is_array<_Yp>::value &&
-                       is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value,
-                       __nat
-                   >::type = __nat());
-    template <class _Yp, class _Dp>
-        shared_ptr(unique_ptr<_Yp, _Dp>,
-                   typename enable_if
-                   <
-                       is_lvalue_reference<_Dp>::value &&
-                       !is_array<_Yp>::value &&
-                       is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value,
-                       __nat
-                   >::type = __nat());
-#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
     ~shared_ptr();
 
@@ -3733,7 +3623,7 @@ public:
     template<class _Yp>
         typename enable_if
         <
-            is_convertible<_Yp*, element_type*>::value,
+            __compatible_with<_Yp, element_type>::value,
             shared_ptr&
         >::type
         _LIBCPP_INLINE_VISIBILITY
@@ -3744,8 +3634,8 @@ public:
     template<class _Yp>
         typename enable_if
         <
-            is_convertible<_Yp*, element_type*>::value,
-            shared_ptr<_Tp>&
+            __compatible_with<_Yp, element_type>::value,
+            shared_ptr&
         >::type
         _LIBCPP_INLINE_VISIBILITY
         operator=(shared_ptr<_Yp>&& __r);
@@ -3795,7 +3685,7 @@ public:
     template<class _Yp>
         typename enable_if
         <
-            is_convertible<_Yp*, element_type*>::value,
+            __compatible_with<_Yp, element_type>::value,
             void
         >::type
         _LIBCPP_INLINE_VISIBILITY
@@ -3803,7 +3693,7 @@ public:
     template<class _Yp, class _Dp>
         typename enable_if
         <
-            is_convertible<_Yp*, element_type*>::value,
+            __compatible_with<_Yp, element_type>::value,
             void
         >::type
         _LIBCPP_INLINE_VISIBILITY
@@ -3811,7 +3701,7 @@ public:
     template<class _Yp, class _Dp, class _Alloc>
         typename enable_if
         <
-            is_convertible<_Yp*, element_type*>::value,
+            __compatible_with<_Yp, element_type>::value,
             void
         >::type
         _LIBCPP_INLINE_VISIBILITY
@@ -3823,7 +3713,12 @@ public:
     typename add_lvalue_reference<element_type>::type operator*() const _NOEXCEPT
         {return *__ptr_;}
     _LIBCPP_INLINE_VISIBILITY
-    element_type* operator->() const _NOEXCEPT {return __ptr_;}
+    element_type* operator->() const _NOEXCEPT
+    {
+        static_assert(!_VSTD::is_array<_Tp>::value,
+                      "std::shared_ptr<T>::operator-> is only valid when T is not an array type.");
+        return __ptr_;
+    }
     _LIBCPP_INLINE_VISIBILITY
     long use_count() const _NOEXCEPT {return __cntrl_ ? __cntrl_->use_count() : 0;}
     _LIBCPP_INLINE_VISIBILITY
@@ -3843,6 +3738,17 @@ public:
     __owner_equivalent(const shared_ptr& __p) const
         {return __cntrl_ == __p.__cntrl_;}
 
+#if _LIBCPP_STD_VER > 14
+    typename add_lvalue_reference<element_type>::type
+    _LIBCPP_INLINE_VISIBILITY
+    operator[](ptrdiff_t __i) const
+    {
+            static_assert(_VSTD::is_array<_Tp>::value,
+                          "std::shared_ptr<T>::operator[] is only valid when T is an array type.");
+            return __ptr_[__i];
+    }
+#endif
+
 #ifndef _LIBCPP_NO_RTTI
     template <class _Dp>
         _LIBCPP_INLINE_VISIBILITY
@@ -3854,7 +3760,7 @@ public:
 
     template<class _Yp, class _CntrlBlk>
     static shared_ptr<_Tp>
-    __create_with_control_block(_Yp* __p, _CntrlBlk* __cntrl)
+    __create_with_control_block(_Yp* __p, _CntrlBlk* __cntrl) _NOEXCEPT
     {
         shared_ptr<_Tp> __r;
         __r.__ptr_ = __p;
@@ -3863,11 +3769,6 @@ public:
         return __r;
     }
 
-    template<class _Alloc, class ..._Args>
-        static
-        shared_ptr<_Tp>
-        allocate_shared(const _Alloc& __a, _Args&& ...__args);
-
 private:
     template <class _Yp, bool = is_function<_Yp>::value>
         struct __shared_ptr_default_allocator
@@ -3900,10 +3801,28 @@ private:
 
     _LIBCPP_INLINE_VISIBILITY void __enable_weak_this(...) _NOEXCEPT {}
 
+    template <class, class _Yp>
+        struct __shared_ptr_default_delete
+            : default_delete<_Yp> {};
+
+    template <class _Yp, class _Un, size_t _Sz>
+        struct __shared_ptr_default_delete<_Yp[_Sz], _Un>
+            : default_delete<_Yp[]> {};
+
+    template <class _Yp, class _Un>
+        struct __shared_ptr_default_delete<_Yp[], _Un>
+            : default_delete<_Yp[]> {};
+
     template <class _Up> friend class _LIBCPP_TEMPLATE_VIS shared_ptr;
     template <class _Up> friend class _LIBCPP_TEMPLATE_VIS weak_ptr;
 };
 
+#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
+template<class _Tp>
+shared_ptr(weak_ptr<_Tp>) -> shared_ptr<_Tp>;
+template<class _Tp, class _Dp>
+shared_ptr(unique_ptr<_Tp, _Dp>) -> shared_ptr<_Tp>;
+#endif
 
 template<class _Tp>
 inline
@@ -3926,13 +3845,13 @@ shared_ptr<_Tp>::shared_ptr(nullptr_t) _NOEXCEPT
 template<class _Tp>
 template<class _Yp>
 shared_ptr<_Tp>::shared_ptr(_Yp* __p,
-                            typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type)
+                            typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type)
     : __ptr_(__p)
 {
     unique_ptr<_Yp> __hold(__p);
     typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT;
-    typedef __shared_ptr_pointer<_Yp*, default_delete<_Yp>, _AllocT > _CntrlBlk;
-    __cntrl_ = new _CntrlBlk(__p, default_delete<_Yp>(), _AllocT());
+    typedef __shared_ptr_pointer<_Yp*, __shared_ptr_default_delete<_Tp, _Yp>, _AllocT > _CntrlBlk;
+    __cntrl_ = new _CntrlBlk(__p, __shared_ptr_default_delete<_Tp, _Yp>(), _AllocT());
     __hold.release();
     __enable_weak_this(__p, __p);
 }
@@ -3940,7 +3859,7 @@ shared_ptr<_Tp>::shared_ptr(_Yp* __p,
 template<class _Tp>
 template<class _Yp, class _Dp>
 shared_ptr<_Tp>::shared_ptr(_Yp* __p, _Dp __d,
-                            typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type)
+                            typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type)
     : __ptr_(__p)
 {
 #ifndef _LIBCPP_NO_EXCEPTIONS
@@ -3986,7 +3905,7 @@ shared_ptr<_Tp>::shared_ptr(nullptr_t __p, _Dp __d)
 template<class _Tp>
 template<class _Yp, class _Dp, class _Alloc>
 shared_ptr<_Tp>::shared_ptr(_Yp* __p, _Dp __d, _Alloc __a,
-                            typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type)
+                            typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type)
     : __ptr_(__p)
 {
 #ifndef _LIBCPP_NO_EXCEPTIONS
@@ -4064,7 +3983,7 @@ template<class _Tp>
 template<class _Yp>
 inline
 shared_ptr<_Tp>::shared_ptr(const shared_ptr<_Yp>& __r,
-                            typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type)
+                            typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type)
          _NOEXCEPT
     : __ptr_(__r.__ptr_),
       __cntrl_(__r.__cntrl_)
@@ -4089,7 +4008,7 @@ template<class _Tp>
 template<class _Yp>
 inline
 shared_ptr<_Tp>::shared_ptr(shared_ptr<_Yp>&& __r,
-                            typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type)
+                            typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type)
          _NOEXCEPT
     : __ptr_(__r.__ptr_),
       __cntrl_(__r.__cntrl_)
@@ -4120,11 +4039,7 @@ shared_ptr<_Tp>::shared_ptr(auto_ptr<_Yp> __r,
 
 template<class _Tp>
 template <class _Yp, class _Dp>
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp>&& __r,
-#else
-shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp> __r,
-#endif
                             typename enable_if
                             <
                                 !is_lvalue_reference<_Dp>::value &&
@@ -4150,11 +4065,7 @@ shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp> __r,
 
 template<class _Tp>
 template <class _Yp, class _Dp>
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp>&& __r,
-#else
-shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp> __r,
-#endif
                             typename enable_if
                             <
                                 is_lvalue_reference<_Dp>::value &&
@@ -4174,32 +4085,12 @@ shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp> __r,
         typedef __shared_ptr_pointer<_Yp*,
                                      reference_wrapper<typename remove_reference<_Dp>::type>,
                                      _AllocT > _CntrlBlk;
-        __cntrl_ = new _CntrlBlk(__r.get(), ref(__r.get_deleter()), _AllocT());
+        __cntrl_ = new _CntrlBlk(__r.get(), _VSTD::ref(__r.get_deleter()), _AllocT());
         __enable_weak_this(__r.get(), __r.get());
     }
     __r.release();
 }
 
-template<class _Tp>
-template<class _Alloc, class ..._Args>
-shared_ptr<_Tp>
-shared_ptr<_Tp>::allocate_shared(const _Alloc& __a, _Args&& ...__args)
-{
-    static_assert( is_constructible<_Tp, _Args...>::value, "Can't construct object in allocate_shared" );
-    typedef __shared_ptr_emplace<_Tp, _Alloc> _CntrlBlk;
-    typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2;
-    typedef __allocator_destructor<_A2> _D2;
-    _A2 __a2(__a);
-    unique_ptr<_CntrlBlk, _D2> __hold2(__a2.allocate(1), _D2(__a2, 1));
-    ::new(static_cast<void*>(_VSTD::addressof(*__hold2.get())))
-        _CntrlBlk(__a, _VSTD::forward<_Args>(__args)...);
-    shared_ptr<_Tp> __r;
-    __r.__ptr_ = __hold2.get()->get();
-    __r.__cntrl_ = _VSTD::addressof(*__hold2.release());
-    __r.__enable_weak_this(__r.__ptr_, __r.__ptr_);
-    return __r;
-}
-
 template<class _Tp>
 shared_ptr<_Tp>::~shared_ptr()
 {
@@ -4221,7 +4112,7 @@ template<class _Yp>
 inline
 typename enable_if
 <
-    is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value,
+    __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value,
     shared_ptr<_Tp>&
 >::type
 shared_ptr<_Tp>::operator=(const shared_ptr<_Yp>& __r) _NOEXCEPT
@@ -4246,7 +4137,7 @@ template<class _Yp>
 inline
 typename enable_if
 <
-    is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value,
+    __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value,
     shared_ptr<_Tp>&
 >::type
 shared_ptr<_Tp>::operator=(shared_ptr<_Yp>&& __r)
@@ -4347,7 +4238,7 @@ template<class _Yp>
 inline
 typename enable_if
 <
-    is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value,
+    __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value,
     void
 >::type
 shared_ptr<_Tp>::reset(_Yp* __p)
@@ -4360,7 +4251,7 @@ template<class _Yp, class _Dp>
 inline
 typename enable_if
 <
-    is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value,
+    __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value,
     void
 >::type
 shared_ptr<_Tp>::reset(_Yp* __p, _Dp __d)
@@ -4373,7 +4264,7 @@ template<class _Yp, class _Dp, class _Alloc>
 inline
 typename enable_if
 <
-    is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value,
+    __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value,
     void
 >::type
 shared_ptr<_Tp>::reset(_Yp* __p, _Dp __d, _Alloc __a)
@@ -4412,7 +4303,19 @@ typename enable_if
 >::type
 allocate_shared(const _Alloc& __a, _Args&& ...__args)
 {
-    return shared_ptr<_Tp>::allocate_shared(__a, _VSTD::forward<_Args>(__args)...);
+    static_assert( is_constructible<_Tp, _Args...>::value, "Can't construct object in allocate_shared");
+
+    typedef __shared_ptr_emplace<_Tp, _Alloc> _CntrlBlk;
+    typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2;
+    typedef __allocator_destructor<_A2> _D2;
+
+    _A2 __a2(__a);
+    unique_ptr<_CntrlBlk, _D2> __hold2(__a2.allocate(1), _D2(__a2, 1));
+    ::new(static_cast<void*>(_VSTD::addressof(*__hold2.get())))
+        _CntrlBlk(__a, _VSTD::forward<_Args>(__args)...);
+
+    typename shared_ptr<_Tp>::element_type *__p = __hold2.get()->get();
+    return shared_ptr<_Tp>::__create_with_control_block(__p, _VSTD::addressof(*__hold2.release()));
 }
 
 template<class _Tp, class _Up>
@@ -4575,41 +4478,41 @@ swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT
 
 template<class _Tp, class _Up>
 inline _LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    !is_array<_Tp>::value && !is_array<_Up>::value,
-    shared_ptr<_Tp>
->::type
+shared_ptr<_Tp>
 static_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT
 {
-    return shared_ptr<_Tp>(__r, static_cast<_Tp*>(__r.get()));
+    return shared_ptr<_Tp>(__r,
+                           static_cast<
+                               typename shared_ptr<_Tp>::element_type*>(__r.get()));
 }
 
 template<class _Tp, class _Up>
 inline _LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    !is_array<_Tp>::value && !is_array<_Up>::value,
-    shared_ptr<_Tp>
->::type
+shared_ptr<_Tp>
 dynamic_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT
 {
-    _Tp* __p = dynamic_cast<_Tp*>(__r.get());
+    typedef typename shared_ptr<_Tp>::element_type _ET;
+    _ET* __p = dynamic_cast<_ET*>(__r.get());
     return __p ? shared_ptr<_Tp>(__r, __p) : shared_ptr<_Tp>();
 }
 
 template<class _Tp, class _Up>
-typename enable_if
-<
-    is_array<_Tp>::value == is_array<_Up>::value,
-    shared_ptr<_Tp>
->::type
+shared_ptr<_Tp>
 const_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT
 {
-    typedef typename remove_extent<_Tp>::type _RTp;
+    typedef typename shared_ptr<_Tp>::element_type _RTp;
     return shared_ptr<_Tp>(__r, const_cast<_RTp*>(__r.get()));
 }
 
+template<class _Tp, class _Up>
+shared_ptr<_Tp>
+reinterpret_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT
+{
+    return shared_ptr<_Tp>(__r,
+                           reinterpret_cast<
+                               typename shared_ptr<_Tp>::element_type*>(__r.get()));
+}
+
 #ifndef _LIBCPP_NO_RTTI
 
 template<class _Dp, class _Tp>
@@ -4712,6 +4615,11 @@ public:
     template <class _Up> friend class _LIBCPP_TEMPLATE_VIS shared_ptr;
 };
 
+#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
+template<class _Tp>
+weak_ptr(shared_ptr<_Tp>) -> weak_ptr<_Tp>;
+#endif
+
 template<class _Tp>
 inline
 _LIBCPP_CONSTEXPR
@@ -5008,7 +4916,7 @@ struct _LIBCPP_TEMPLATE_VIS hash<shared_ptr<_Tp> >
     _LIBCPP_INLINE_VISIBILITY
     result_type operator()(const argument_type& __ptr) const _NOEXCEPT
     {
-        return hash<_Tp*>()(__ptr.get());
+        return hash<typename shared_ptr<_Tp>::element_type*>()(__ptr.get());
     }
 };
 
diff --git a/gnu/llvm/libcxx/include/module.modulemap b/gnu/llvm/libcxx/include/module.modulemap
index 31d39ddf7c8..b8d2a6669aa 100644
--- a/gnu/llvm/libcxx/include/module.modulemap
+++ b/gnu/llvm/libcxx/include/module.modulemap
@@ -231,6 +231,11 @@ module std [system] {
     header "atomic"
     export *
   }
+  module barrier {
+    requires cplusplus14
+    header "barrier"
+    export *
+  }
   module bit {
     header "bit"
     export *
@@ -262,6 +267,10 @@ module std [system] {
     header "complex"
     export *
   }
+  module concepts {
+    header "concepts"
+    export *
+  }
   module condition_variable {
     header "condition_variable"
     export *
@@ -334,6 +343,11 @@ module std [system] {
     header "iterator"
     export *
   }
+  module latch {
+    requires cplusplus14
+    header "latch"
+    export *
+  }
   module limits {
     header "limits"
     export *
@@ -364,6 +378,10 @@ module std [system] {
     header "new"
     export *
   }
+  module numbers {
+    header "numbers"
+    export *
+  }
   module numeric {
     header "numeric"
     export *
@@ -400,6 +418,11 @@ module std [system] {
     header "scoped_allocator"
     export *
   }
+  module semaphore {
+    requires cplusplus14
+    header "semaphore"
+    export *
+  }
   module set {
     header "set"
     export initializer_list
diff --git a/gnu/llvm/libcxx/include/numbers b/gnu/llvm/libcxx/include/numbers
new file mode 100644
index 00000000000..e7d981be4aa
--- /dev/null
+++ b/gnu/llvm/libcxx/include/numbers
@@ -0,0 +1,141 @@
+// -*- C++ -*-
+//===---------------------------- numbers ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_NUMBERS
+#define _LIBCPP_NUMBERS
+
+/*
+    numbers synopsis
+
+namespace std::numbers {
+  template<class T> inline constexpr T e_v          = unspecified;
+  template<class T> inline constexpr T log2e_v      = unspecified;
+  template<class T> inline constexpr T log10e_v     = unspecified;
+  template<class T> inline constexpr T pi_v         = unspecified;
+  template<class T> inline constexpr T inv_pi_v     = unspecified;
+  template<class T> inline constexpr T inv_sqrtpi_v = unspecified;
+  template<class T> inline constexpr T ln2_v        = unspecified;
+  template<class T> inline constexpr T ln10_v       = unspecified;
+  template<class T> inline constexpr T sqrt2_v      = unspecified;
+  template<class T> inline constexpr T sqrt3_v      = unspecified;
+  template<class T> inline constexpr T inv_sqrt3_v  = unspecified;
+  template<class T> inline constexpr T egamma_v     = unspecified;
+  template<class T> inline constexpr T phi_v        = unspecified;
+
+  template<floating_point T> inline constexpr T e_v<T>          = see below;
+  template<floating_point T> inline constexpr T log2e_v<T>      = see below;
+  template<floating_point T> inline constexpr T log10e_v<T>     = see below;
+  template<floating_point T> inline constexpr T pi_v<T>         = see below;
+  template<floating_point T> inline constexpr T inv_pi_v<T>     = see below;
+  template<floating_point T> inline constexpr T inv_sqrtpi_v<T> = see below;
+  template<floating_point T> inline constexpr T ln2_v<T>        = see below;
+  template<floating_point T> inline constexpr T ln10_v<T>       = see below;
+  template<floating_point T> inline constexpr T sqrt2_v<T>      = see below;
+  template<floating_point T> inline constexpr T sqrt3_v<T>      = see below;
+  template<floating_point T> inline constexpr T inv_sqrt3_v<T>  = see below;
+  template<floating_point T> inline constexpr T egamma_v<T>     = see below;
+  template<floating_point T> inline constexpr T phi_v<T>        = see below;
+
+  inline constexpr double e          = e_v<double>;
+  inline constexpr double log2e      = log2e_v<double>;
+  inline constexpr double log10e     = log10e_v<double>;
+  inline constexpr double pi         = pi_v<double>;
+  inline constexpr double inv_pi     = inv_pi_v<double>;
+  inline constexpr double inv_sqrtpi = inv_sqrtpi_v<double>;
+  inline constexpr double ln2        = ln2_v<double>;
+  inline constexpr double ln10       = ln10_v<double>;
+  inline constexpr double sqrt2      = sqrt2_v<double>;
+  inline constexpr double sqrt3      = sqrt3_v<double>;
+  inline constexpr double inv_sqrt3  = inv_sqrt3_v<double>;
+  inline constexpr double egamma     = egamma_v<double>;
+  inline constexpr double phi        = phi_v<double>;
+}
+*/
+
+#include <__config>
+
+#if _LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L
+
+#include <type_traits>
+#include <version>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace numbers {
+
+template <class T>
+inline constexpr bool __false = false;
+
+template <class T>
+struct __illformed
+{
+  static_assert(__false<T>, "A program that instantiates a primary template of a mathematical constant variable template is ill-formed.");
+};
+
+template <class T> inline constexpr T e_v =          __illformed<T>{};
+template <class T> inline constexpr T log2e_v =      __illformed<T>{};
+template <class T> inline constexpr T log10e_v =     __illformed<T>{};
+template <class T> inline constexpr T pi_v =         __illformed<T>{};
+template <class T> inline constexpr T inv_pi_v =     __illformed<T>{};
+template <class T> inline constexpr T inv_sqrtpi_v = __illformed<T>{};
+template <class T> inline constexpr T ln2_v =        __illformed<T>{};
+template <class T> inline constexpr T ln10_v =       __illformed<T>{};
+template <class T> inline constexpr T sqrt2_v =      __illformed<T>{};
+template <class T> inline constexpr T sqrt3_v =      __illformed<T>{};
+template <class T> inline constexpr T inv_sqrt3_v =  __illformed<T>{};
+template <class T> inline constexpr T egamma_v =     __illformed<T>{};
+template <class T> inline constexpr T phi_v =        __illformed<T>{};
+
+template <class T>
+concept __floating_point = std::is_floating_point_v<T>;
+
+template <__floating_point T> inline constexpr T e_v<T>          = 2.718281828459045235360287471352662;
+template <__floating_point T> inline constexpr T log2e_v<T>      = 1.442695040888963407359924681001892;
+template <__floating_point T> inline constexpr T log10e_v<T>     = 0.434294481903251827651128918916605;
+template <__floating_point T> inline constexpr T pi_v<T>         = 3.141592653589793238462643383279502;
+template <__floating_point T> inline constexpr T inv_pi_v<T>     = 0.318309886183790671537767526745028;
+template <__floating_point T> inline constexpr T inv_sqrtpi_v<T> = 0.564189583547756286948079451560772;
+template <__floating_point T> inline constexpr T ln2_v<T>        = 0.693147180559945309417232121458176;
+template <__floating_point T> inline constexpr T ln10_v<T>       = 2.302585092994045684017991454684364;
+template <__floating_point T> inline constexpr T sqrt2_v<T>      = 1.414213562373095048801688724209698;
+template <__floating_point T> inline constexpr T sqrt3_v<T>      = 1.732050807568877293527446341505872;
+template <__floating_point T> inline constexpr T inv_sqrt3_v<T>  = 0.577350269189625764509148780501957;
+template <__floating_point T> inline constexpr T egamma_v<T>     = 0.577215664901532860606512090082402;
+template <__floating_point T> inline constexpr T phi_v<T>        = 1.618033988749894848204586834365638;
+
+inline constexpr double e          = e_v<double>;
+inline constexpr double log2e      = log2e_v<double>;
+inline constexpr double log10e     = log10e_v<double>;
+inline constexpr double pi         = pi_v<double>;
+inline constexpr double inv_pi     = inv_pi_v<double>;
+inline constexpr double inv_sqrtpi = inv_sqrtpi_v<double>;
+inline constexpr double ln2        = ln2_v<double>;
+inline constexpr double ln10       = ln10_v<double>;
+inline constexpr double sqrt2      = sqrt2_v<double>;
+inline constexpr double sqrt3      = sqrt3_v<double>;
+inline constexpr double inv_sqrt3  = inv_sqrt3_v<double>;
+inline constexpr double egamma     = egamma_v<double>;
+inline constexpr double phi        = phi_v<double>;
+
+} // namespace numbers
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif //_LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L
+
+#endif // _LIBCPP_NUMBERS
diff --git a/gnu/llvm/libcxx/include/ostream b/gnu/llvm/libcxx/include/ostream
index ea3870532f3..697732d54e6 100644
--- a/gnu/llvm/libcxx/include/ostream
+++ b/gnu/llvm/libcxx/include/ostream
@@ -999,7 +999,7 @@ basic_ostream<_CharT, _Traits>::seekp(off_type __off, ios_base::seekdir __dir)
 }
 
 template <class _CharT, class _Traits>
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 basic_ostream<_CharT, _Traits>&
 endl(basic_ostream<_CharT, _Traits>& __os)
 {
@@ -1009,7 +1009,7 @@ endl(basic_ostream<_CharT, _Traits>& __os)
 }
 
 template <class _CharT, class _Traits>
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 basic_ostream<_CharT, _Traits>&
 ends(basic_ostream<_CharT, _Traits>& __os)
 {
@@ -1018,7 +1018,7 @@ ends(basic_ostream<_CharT, _Traits>& __os)
 }
 
 template <class _CharT, class _Traits>
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 basic_ostream<_CharT, _Traits>&
 flush(basic_ostream<_CharT, _Traits>& __os)
 {
diff --git a/gnu/llvm/libcxx/include/random b/gnu/llvm/libcxx/include/random
index 7c4054f7eea..ce3d135e064 100644
--- a/gnu/llvm/libcxx/include/random
+++ b/gnu/llvm/libcxx/include/random
@@ -4048,10 +4048,12 @@ binomial_distribution<_IntType>::operator()(_URNG& __g, const param_type& __pr)
     result_type __rd = __ru;
     while (true)
     {
+        bool __break = true;
         if (__rd >= 1)
         {
             __pd *= __rd / (__pr.__odds_ratio_ * (__pr.__t_ - __rd + 1));
             __u -= __pd;
+            __break = false;
             if (__u < 0)
                 return __rd - 1;
         }
@@ -4062,9 +4064,12 @@ binomial_distribution<_IntType>::operator()(_URNG& __g, const param_type& __pr)
         {
             __pu *= (__pr.__t_ - __ru + 1) * __pr.__odds_ratio_ / __ru;
             __u -= __pu;
+            __break = false;
             if (__u < 0)
                 return __ru;
         }
+        if (__break)
+            return 0;
     }
 }
 
diff --git a/gnu/llvm/libcxx/include/regex b/gnu/llvm/libcxx/include/regex
index 5ac9e325e13..f42f1ecd16a 100644
--- a/gnu/llvm/libcxx/include/regex
+++ b/gnu/llvm/libcxx/include/regex
@@ -21,7 +21,7 @@ namespace std
 namespace regex_constants
 {
 
-emum syntax_option_type
+enum syntax_option_type
 {
     icase      = unspecified,
     nosubs     = unspecified,
@@ -631,7 +631,7 @@ template <class OutputIterator, class BidirectionalIterator,
                   const basic_regex<charT, traits>& e, const charT* fmt,
                   regex_constants::match_flag_type flags = regex_constants::match_default);
 
-template <class traits, class charT, class ST, class SA, class FST, class FSA>>
+template <class traits, class charT, class ST, class SA, class FST, class FSA>
     basic_string<charT, ST, SA>
     regex_replace(const basic_string<charT, ST, SA>& s,
                   const basic_regex<charT, traits>& e,
@@ -675,9 +675,9 @@ public:
     regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
                    const regex_type& re,
                    regex_constants::match_flag_type m = regex_constants::match_default);
-    regex_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
-                   const regex_type&& __re,
-                   regex_constants::match_flag_type __m
+    regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
+                   const regex_type&& re,
+                   regex_constants::match_flag_type m
                                      = regex_constants::match_default) = delete; // C++14
     regex_iterator(const regex_iterator&);
     regex_iterator& operator=(const regex_iterator&);
@@ -698,7 +698,7 @@ typedef regex_iterator<string::const_iterator>  sregex_iterator;
 typedef regex_iterator<wstring::const_iterator> wsregex_iterator;
 
 template <class BidirectionalIterator,
-          class charT = typename iterator_traits< BidirectionalIterator>::value_type,
+          class charT = typename iterator_traits<BidirectionalIterator>::value_type,
           class traits = regex_traits<charT>>
 class regex_token_iterator
 {
@@ -735,8 +735,8 @@ public:
                              regex_constants::match_flag_type m = regex_constants::match_default);
     template <size_t N>
         regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
-                             const regex_type& re, const int (&submatches)[N],
-                             regex_constants::match_flag_type m = regex_constants::match_default) = delete // C++14;
+                             const regex_type&& re, const int (&submatches)[N],
+                             regex_constants::match_flag_type m = regex_constants::match_default) = delete; // C++14
     regex_token_iterator(const regex_token_iterator&);
     regex_token_iterator& operator=(const regex_token_iterator&);
 
@@ -977,7 +977,8 @@ class _LIBCPP_EXCEPTION_ABI regex_error
     regex_constants::error_type __code_;
 public:
     explicit regex_error(regex_constants::error_type __ecode);
-    virtual ~regex_error() throw();
+    regex_error(const regex_error&) _NOEXCEPT = default;
+    virtual ~regex_error() _NOEXCEPT;
      _LIBCPP_INLINE_VISIBILITY
     regex_constants::error_type code() const {return __code_;}
 };
@@ -1000,7 +1001,19 @@ public:
     typedef _CharT                  char_type;
     typedef basic_string<char_type> string_type;
     typedef locale                  locale_type;
+#ifdef __BIONIC__
+    // Originally bionic's ctype_base used its own ctype masks because the
+    // builtin ctype implementation wasn't in libc++ yet. Bionic's ctype mask
+    // was only 8 bits wide and already saturated, so it used a wider type here
+    // to make room for __regex_word (then a part of this class rather than
+    // ctype_base). Bionic has since moved to the builtin ctype_base
+    // implementation, but this was not updated to match. Since then Android has
+    // needed to maintain a stable libc++ ABI, and this can't be changed without
+    // an ABI break.
+    typedef uint16_t char_class_type;
+#else
     typedef ctype_base::mask        char_class_type;
+#endif
 
     static const char_class_type __regex_word = ctype_base::__regex_word;
 private:
@@ -2837,6 +2850,8 @@ private:
         __parse_awk_escape(_ForwardIterator __first, _ForwardIterator __last,
                           basic_string<_CharT>* __str = nullptr);
 
+    bool __test_back_ref(_CharT c);
+
     _LIBCPP_INLINE_VISIBILITY
     void __push_l_anchor();
     void __push_r_anchor();
@@ -3408,18 +3423,8 @@ basic_regex<_CharT, _Traits>::__parse_BACKREF(_ForwardIterator __first,
     if (__first != __last)
     {
         _ForwardIterator __temp = _VSTD::next(__first);
-        if (__temp != __last)
-        {
-            if (*__first == '\\')
-            {
-                int __val = __traits_.value(*__temp, 10);
-                if (__val >= 1 && __val <= 9)
-                {
-                    __push_back_ref(__val);
-                    __first = ++__temp;
-                }
-            }
-        }
+        if (__temp != __last && *__first == '\\' && __test_back_ref(*__temp))
+            __first = ++__temp;
     }
     return __first;
 }
@@ -3547,6 +3552,8 @@ basic_regex<_CharT, _Traits>::__parse_QUOTED_CHAR_ERE(_ForwardIterator __first,
                 default:
                     if (__get_grammar(__flags_) == awk)
                         __first = __parse_awk_escape(++__first, __last);
+                    else if(__test_back_ref(*__temp))
+                        __first = ++__temp;
                     break;
                 }
             }
@@ -4660,6 +4667,22 @@ basic_regex<_CharT, _Traits>::__parse_egrep(_ForwardIterator __first,
     return __first;
 }
 
+template <class _CharT, class _Traits>
+bool
+basic_regex<_CharT, _Traits>::__test_back_ref(_CharT c)
+{
+    unsigned __val = __traits_.value(c, 10);
+    if (__val >= 1 && __val <= 9)
+    {
+        if (__val > mark_count())
+            __throw_regex_error<regex_constants::error_backref>();
+        __push_back_ref(__val);
+        return true;
+    }
+
+    return false;
+}
+
 template <class _CharT, class _Traits>
 void
 basic_regex<_CharT, _Traits>::__push_loop(size_t __min, size_t __max,
@@ -5917,6 +5940,9 @@ basic_regex<_CharT, _Traits>::__search(
         match_results<const _CharT*, _Allocator>& __m,
         regex_constants::match_flag_type __flags) const
 {
+    if (__flags & regex_constants::match_prev_avail)
+        __flags &= ~(regex_constants::match_not_bol | regex_constants::match_not_bow);
+
     __m.__init(1 + mark_count(), __first, __last,
                                     __flags & regex_constants::__no_update_pos);
     if (__match_at_start(__first, __last, __m, __flags,
diff --git a/gnu/llvm/libcxx/include/semaphore b/gnu/llvm/libcxx/include/semaphore
new file mode 100644
index 00000000000..447bc2f385d
--- /dev/null
+++ b/gnu/llvm/libcxx/include/semaphore
@@ -0,0 +1,235 @@
+// -*- C++ -*-
+//===--------------------------- semaphore --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_SEMAPHORE
+#define _LIBCPP_SEMAPHORE
+
+/*
+    semaphore synopsis
+
+namespace std {
+
+template<ptrdiff_t least_max_value = implementation-defined>
+class counting_semaphore
+{
+public:
+static constexpr ptrdiff_t max() noexcept;
+
+constexpr explicit counting_semaphore(ptrdiff_t desired);
+~counting_semaphore();
+
+counting_semaphore(const counting_semaphore&) = delete;
+counting_semaphore& operator=(const counting_semaphore&) = delete;
+
+void release(ptrdiff_t update = 1);
+void acquire();
+bool try_acquire() noexcept;
+template<class Rep, class Period>
+    bool try_acquire_for(const chrono::duration<Rep, Period>& rel_time);
+template<class Clock, class Duration>
+    bool try_acquire_until(const chrono::time_point<Clock, Duration>& abs_time);
+
+private:
+ptrdiff_t counter; // exposition only
+};
+
+using binary_semaphore = counting_semaphore<1>;
+
+}
+
+*/
+
+#include <__config>
+#include <__threading_support>
+#include <atomic>
+#include <cassert>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#ifdef _LIBCPP_HAS_NO_THREADS
+# error <semaphore> is not supported on this single threaded system
+#endif
+
+#if _LIBCPP_STD_VER >= 14
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+/*
+
+__atomic_semaphore_base is the general-case implementation, to be used for
+user-requested least-max values that exceed the OS implementation support
+(incl. when the OS has no support of its own) and for binary semaphores.
+
+It is a typical Dijsktra semaphore algorithm over atomics, wait and notify
+functions. It avoids contention against users' own use of those facilities.
+
+*/
+
+class __atomic_semaphore_base
+{
+    __atomic_base<ptrdiff_t> __a;
+
+public:
+    _LIBCPP_INLINE_VISIBILITY
+    __atomic_semaphore_base(ptrdiff_t __count) : __a(__count)
+    {
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void release(ptrdiff_t __update = 1)
+    {
+        if(0 < __a.fetch_add(__update, memory_order_release))
+            ;
+        else if(__update > 1)
+            __a.notify_all();
+        else
+            __a.notify_one();
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void acquire()
+    {
+        auto const __test_fn = [=]() -> bool {
+            auto __old = __a.load(memory_order_relaxed);
+            return (__old != 0) && __a.compare_exchange_strong(__old, __old - 1, memory_order_acquire, memory_order_relaxed);
+        };
+        __cxx_atomic_wait(&__a.__a_, __test_fn);
+    }
+    template <class Rep, class Period>
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    bool try_acquire_for(chrono::duration<Rep, Period> const& __rel_time)
+    {
+        auto const __test_fn = [=]() -> bool {
+            auto __old = __a.load(memory_order_acquire);
+            while(1) {
+                if (__old == 0)
+                    return false;
+                if(__a.compare_exchange_strong(__old, __old - 1, memory_order_acquire, memory_order_relaxed))
+                    return true;
+            }
+        };
+        return __libcpp_thread_poll_with_backoff(__test_fn, __libcpp_timed_backoff_policy(), __rel_time);
+    }
+};
+
+#ifndef _LIBCPP_NO_NATIVE_SEMAPHORES
+
+/*
+
+__platform_semaphore_base a simple wrapper for the OS semaphore type. That
+is, every call is routed to the OS in the most direct manner possible.
+
+*/
+
+class __platform_semaphore_base
+{
+    __libcpp_semaphore_t __semaphore;
+
+public:
+    _LIBCPP_INLINE_VISIBILITY
+    __platform_semaphore_base(ptrdiff_t __count) :
+        __semaphore()
+    {
+        __libcpp_semaphore_init(&__semaphore, __count);
+    }
+    _LIBCPP_INLINE_VISIBILITY
+    ~__platform_semaphore_base() {
+        __libcpp_semaphore_destroy(&__semaphore);
+    }
+    _LIBCPP_INLINE_VISIBILITY
+    void release(ptrdiff_t __update)
+    {
+        for(; __update; --__update)
+            __libcpp_semaphore_post(&__semaphore);
+    }
+    _LIBCPP_INLINE_VISIBILITY
+    void acquire()
+    {
+        __libcpp_semaphore_wait(&__semaphore);
+    }
+    _LIBCPP_INLINE_VISIBILITY
+    bool try_acquire_for(chrono::nanoseconds __rel_time)
+    {
+        return __libcpp_semaphore_wait_timed(&__semaphore, __rel_time);
+    }
+};
+
+template<ptrdiff_t __least_max_value>
+using __semaphore_base =
+    typename conditional<(__least_max_value > 1 && __least_max_value <= _LIBCPP_SEMAPHORE_MAX),
+                         __platform_semaphore_base,
+                         __atomic_semaphore_base>::type;
+
+#else
+
+template<ptrdiff_t __least_max_value>
+using __semaphore_base =
+    __atomic_semaphore_base;
+
+#define _LIBCPP_SEMAPHORE_MAX (numeric_limits<ptrdiff_t>::max())
+
+#endif //_LIBCPP_NO_NATIVE_SEMAPHORES
+
+template<ptrdiff_t __least_max_value = _LIBCPP_SEMAPHORE_MAX>
+class counting_semaphore
+{
+    __semaphore_base<__least_max_value> __semaphore;
+
+public:
+    static constexpr ptrdiff_t max() noexcept {
+        return __least_max_value;
+    }
+
+    _LIBCPP_INLINE_VISIBILITY
+    counting_semaphore(ptrdiff_t __count = 0) : __semaphore(__count) { }
+    ~counting_semaphore() = default;
+
+    counting_semaphore(const counting_semaphore&) = delete;
+    counting_semaphore& operator=(const counting_semaphore&) = delete;
+
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void release(ptrdiff_t __update = 1)
+    {
+        __semaphore.release(__update);
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    void acquire()
+    {
+        __semaphore.acquire();
+    }
+    template<class Rep, class Period>
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    bool try_acquire_for(chrono::duration<Rep, Period> const& __rel_time)
+    {
+        return __semaphore.try_acquire_for(chrono::duration_cast<chrono::nanoseconds>(__rel_time));
+    }
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    bool try_acquire()
+    {
+        return try_acquire_for(chrono::nanoseconds::zero());
+    }
+    template <class Clock, class Duration>
+    _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INLINE_VISIBILITY
+    bool try_acquire_until(chrono::time_point<Clock, Duration> const& __abs_time)
+    {
+        auto const current = Clock::now();
+        if(current >= __abs_time)
+            return try_acquire();
+        else
+            return try_acquire_for(__abs_time - current);
+    }
+};
+
+using binary_semaphore = counting_semaphore<1>;
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 14
+
+#endif //_LIBCPP_SEMAPHORE
diff --git a/gnu/llvm/libcxx/include/set b/gnu/llvm/libcxx/include/set
index ac3fbbe02fc..d58455bfe21 100644
--- a/gnu/llvm/libcxx/include/set
+++ b/gnu/llvm/libcxx/include/set
@@ -216,7 +216,8 @@ swap(set<Key, Compare, Allocator>& x, set<Key, Compare, Allocator>& y)
     noexcept(noexcept(x.swap(y)));
 
 template <class Key, class Compare, class Allocator, class Predicate>
-  void erase_if(set<Key, Compare, Allocator>& c, Predicate pred);  // C++20
+typename set<Key, Compare, Allocator>::size_type
+erase_if(set<Key, Compare, Allocator>& c, Predicate pred);  // C++20
 
 template <class Key, class Compare = less<Key>,
           class Allocator = allocator<Key>>
@@ -417,7 +418,8 @@ swap(multiset<Key, Compare, Allocator>& x, multiset<Key, Compare, Allocator>& y)
     noexcept(noexcept(x.swap(y)));
 
 template <class Key, class Compare, class Allocator, class Predicate>
-  void erase_if(multiset<Key, Compare, Allocator>& c, Predicate pred);  // C++20
+typename multiset<Key, Compare, Allocator>::size_type
+erase_if(multiset<Key, Compare, Allocator>& c, Predicate pred);  // C++20
 
 }  // std
 
@@ -960,8 +962,10 @@ swap(set<_Key, _Compare, _Allocator>& __x,
 #if _LIBCPP_STD_VER > 17
 template <class _Key, class _Compare, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(set<_Key, _Compare, _Allocator>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename set<_Key, _Compare, _Allocator>::size_type
+    erase_if(set<_Key, _Compare, _Allocator>& __c, _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 template <class _Key, class _Compare = less<_Key>,
@@ -1484,8 +1488,10 @@ swap(multiset<_Key, _Compare, _Allocator>& __x,
 #if _LIBCPP_STD_VER > 17
 template <class _Key, class _Compare, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(multiset<_Key, _Compare, _Allocator>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename multiset<_Key, _Compare, _Allocator>::size_type
+    erase_if(multiset<_Key, _Compare, _Allocator>& __c, _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/include/span b/gnu/llvm/libcxx/include/span
index 3421ca0f5a8..b307c98aee2 100644
--- a/gnu/llvm/libcxx/include/span
+++ b/gnu/llvm/libcxx/include/span
@@ -46,15 +46,13 @@ public:
     using reference = element_type&;
     using const_reference = const element_type&;
     using iterator = implementation-defined;
-    using const_iterator = implementation-defined;
     using reverse_iterator = std::reverse_iterator<iterator>;
-    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
     static constexpr size_type extent = Extent;
 
     // [span.cons], span constructors, copy, assignment, and destructor
     constexpr span() noexcept;
-    constexpr span(pointer ptr, size_type count);
-    constexpr span(pointer firstElem, pointer lastElem);
+    constexpr explicit(Extent != dynamic_extent) span(pointer ptr, size_type count);
+    constexpr explicit(Extent != dynamic_extent) span(pointer firstElem, pointer lastElem);
     template <size_t N>
         constexpr span(element_type (&arr)[N]) noexcept;
     template <size_t N>
@@ -62,12 +60,12 @@ public:
     template <size_t N>
         constexpr span(const array<value_type, N>& arr) noexcept;
     template <class Container>
-        constexpr span(Container& cont);
+        constexpr explicit(Extent != dynamic_extent) span(Container& cont);
     template <class Container>
-        constexpr span(const Container& cont);
+        constexpr explicit(Extent != dynamic_extent) span(const Container& cont);
     constexpr span(const span& other) noexcept = default;
     template <class OtherElementType, size_t OtherExtent>
-        constexpr span(const span<OtherElementType, OtherExtent>& s) noexcept;
+        constexpr explicit(Extent != dynamic_extent) span(const span<OtherElementType, OtherExtent>& s) noexcept;
     ~span() noexcept = default;
     constexpr span& operator=(const span& other) noexcept = default;
 
@@ -97,12 +95,8 @@ public:
     // [span.iterators], span iterator support
     constexpr iterator begin() const noexcept;
     constexpr iterator end() const noexcept;
-    constexpr const_iterator cbegin() const noexcept;
-    constexpr const_iterator cend() const noexcept;
     constexpr reverse_iterator rbegin() const noexcept;
     constexpr reverse_iterator rend() const noexcept;
-    constexpr const_reverse_iterator crbegin() const noexcept;
-    constexpr const_reverse_iterator crend() const noexcept;
 
 private:
     pointer data_;    // exposition only
@@ -129,11 +123,10 @@ template<class Container>
 */
 
 #include <__config>
-#include <cstddef>      // for ptrdiff_t
-#include <iterator>     // for iterators
 #include <array>        // for array
-#include <type_traits>  // for remove_cv, etc
 #include <cstddef>      // for byte
+#include <iterator>     // for iterators
+#include <type_traits>  // for remove_cv, etc
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
@@ -143,7 +136,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 #if _LIBCPP_STD_VER > 17
 
-inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max();
+inline constexpr size_t dynamic_extent = (numeric_limits<size_t>::max)();
 template <typename _Tp, size_t _Extent = dynamic_extent> class span;
 
 
@@ -202,27 +195,49 @@ public:
     using reference              = _Tp &;
     using const_reference        = const _Tp &;
     using iterator               =  __wrap_iter<pointer>;
-    using const_iterator         =  __wrap_iter<const_pointer>;
     using reverse_iterator       = _VSTD::reverse_iterator<iterator>;
-    using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>;
 
     static constexpr size_type extent = _Extent;
 
 // [span.cons], span constructors, copy, assignment, and destructor
-    _LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data{nullptr}
-    { static_assert(_Extent == 0, "Can't default construct a statically sized span with size > 0"); }
+    template <size_t _Sz = _Extent, enable_if_t<_Sz == 0, nullptr_t> = nullptr>
+    _LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data{nullptr} {}
 
     constexpr span           (const span&) noexcept = default;
     constexpr span& operator=(const span&) noexcept = default;
 
-    _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __ptr, size_type __count) : __data{__ptr}
+    _LIBCPP_INLINE_VISIBILITY constexpr explicit span(pointer __ptr, size_type __count) : __data{__ptr}
         { (void)__count; _LIBCPP_ASSERT(_Extent == __count, "size mismatch in span's constructor (ptr, len)"); }
-    _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __f, pointer __l) : __data{__f}
+    _LIBCPP_INLINE_VISIBILITY constexpr explicit span(pointer __f, pointer __l) : __data{__f}
         { (void)__l;     _LIBCPP_ASSERT(_Extent == distance(__f, __l), "size mismatch in span's constructor (ptr, ptr)"); }
 
     _LIBCPP_INLINE_VISIBILITY constexpr span(element_type (&__arr)[_Extent])          noexcept : __data{__arr} {}
-    _LIBCPP_INLINE_VISIBILITY constexpr span(      array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
-    _LIBCPP_INLINE_VISIBILITY constexpr span(const array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
+
+    template <class _OtherElementType,
+              enable_if_t<is_convertible_v<_OtherElementType(*)[], element_type (*)[]>, nullptr_t> = nullptr>
+    _LIBCPP_INLINE_VISIBILITY
+    constexpr span(array<_OtherElementType, _Extent>& __arr) noexcept : __data{__arr.data()} {}
+
+    template <class _OtherElementType,
+              enable_if_t<is_convertible_v<const _OtherElementType(*)[], element_type (*)[]>, nullptr_t> = nullptr>
+    _LIBCPP_INLINE_VISIBILITY
+    constexpr span(const array<_OtherElementType, _Extent>& __arr) noexcept : __data{__arr.data()} {}
+
+    template <class _Container>
+    _LIBCPP_INLINE_VISIBILITY
+        constexpr explicit span(      _Container& __c,
+            enable_if_t<__is_span_compatible_container<_Container, _Tp>::value, nullptr_t> = nullptr)
+        : __data{_VSTD::data(__c)} {
+            _LIBCPP_ASSERT(_Extent == _VSTD::size(__c), "size mismatch in span's constructor (range)");
+        }
+
+    template <class _Container>
+    _LIBCPP_INLINE_VISIBILITY
+        constexpr explicit span(const _Container& __c,
+            enable_if_t<__is_span_compatible_container<const _Container, _Tp>::value, nullptr_t> = nullptr)
+        : __data{_VSTD::data(__c)} {
+            _LIBCPP_ASSERT(_Extent == _VSTD::size(__c), "size mismatch in span's constructor (range)");
+        }
 
     template <class _OtherElementType>
     _LIBCPP_INLINE_VISIBILITY
@@ -234,7 +249,7 @@ public:
 
     template <class _OtherElementType>
     _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const span<_OtherElementType, dynamic_extent>& __other,
+        constexpr explicit span(const span<_OtherElementType, dynamic_extent>& __other,
                        enable_if_t<
                           is_convertible_v<_OtherElementType(*)[], element_type (*)[]>,
                           nullptr_t> = nullptr) noexcept
@@ -248,7 +263,7 @@ public:
     constexpr span<element_type, _Count> first() const noexcept
     {
         static_assert(_Count <= _Extent, "Count out of range in span::first()");
-        return {data(), _Count};
+        return span<element_type, _Count>{data(), _Count};
     }
 
     template <size_t _Count>
@@ -256,7 +271,7 @@ public:
     constexpr span<element_type, _Count> last() const noexcept
     {
         static_assert(_Count <= _Extent, "Count out of range in span::last()");
-        return {data() + size() - _Count, _Count};
+        return span<element_type, _Count>{data() + size() - _Count, _Count};
     }
 
     _LIBCPP_INLINE_VISIBILITY
@@ -279,7 +294,10 @@ public:
         -> span<element_type, _Count != dynamic_extent ? _Count : _Extent - _Offset>
     {
         static_assert(_Offset <= _Extent, "Offset out of range in span::subspan()");
-        return {data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
+        static_assert(_Count == dynamic_extent || _Count <= _Extent - _Offset, "Offset + count out of range in span::subspan()");
+
+        using _ReturnType = span<element_type, _Count != dynamic_extent ? _Count : _Extent - _Offset>;
+        return _ReturnType{data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
     }
 
 
@@ -291,7 +309,7 @@ public:
         _LIBCPP_ASSERT(__count  <= size() || __count == dynamic_extent, "Count out of range in span::subspan(offset, count)");
         if (__count == dynamic_extent)
             return {data() + __offset, size() - __offset};
-        _LIBCPP_ASSERT(__offset <= size() - __count, "count + offset out of range in span::subspan(offset, count)");
+        _LIBCPP_ASSERT(__count <= size() - __offset, "Offset + count out of range in span::subspan(offset, count)");
         return {data() + __offset, __count};
     }
 
@@ -301,19 +319,19 @@ public:
 
     _LIBCPP_INLINE_VISIBILITY constexpr reference operator[](size_type __idx) const noexcept
     {
-        _LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T,N>[] index out of bounds");
+        _LIBCPP_ASSERT(__idx < size(), "span<T,N>[] index out of bounds");
         return __data[__idx];
     }
 
     _LIBCPP_INLINE_VISIBILITY constexpr reference front() const noexcept
     {
-        static_assert(_Extent > 0, "span<T,N>[].front() on empty span");
+        _LIBCPP_ASSERT(!empty(), "span<T, N>::front() on empty span");
         return __data[0];
     }
 
     _LIBCPP_INLINE_VISIBILITY constexpr reference back() const noexcept
     {
-        static_assert(_Extent > 0, "span<T,N>[].back() on empty span");
+        _LIBCPP_ASSERT(!empty(), "span<T, N>::back() on empty span");
         return __data[size()-1];
     }
 
@@ -322,25 +340,14 @@ public:
 // [span.iter], span iterator support
     _LIBCPP_INLINE_VISIBILITY constexpr iterator                 begin() const noexcept { return iterator(data()); }
     _LIBCPP_INLINE_VISIBILITY constexpr iterator                   end() const noexcept { return iterator(data() + size()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator          cbegin() const noexcept { return const_iterator(data()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator            cend() const noexcept { return const_iterator(data() + size()); }
     _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator        rbegin() const noexcept { return reverse_iterator(end()); }
     _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator          rend() const noexcept { return reverse_iterator(begin()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(cend()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator   crend() const noexcept { return const_reverse_iterator(cbegin()); }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr void swap(span &__other) noexcept
-    {
-        pointer __p = __data;
-        __data = __other.__data;
-        __other.__data = __p;
-    }
 
     _LIBCPP_INLINE_VISIBILITY span<const byte, _Extent * sizeof(element_type)> __as_bytes() const noexcept
-    { return {reinterpret_cast<const byte *>(data()), size_bytes()}; }
+    { return span<const byte, _Extent * sizeof(element_type)>{reinterpret_cast<const byte *>(data()), size_bytes()}; }
 
     _LIBCPP_INLINE_VISIBILITY span<byte, _Extent * sizeof(element_type)> __as_writable_bytes() const noexcept
-    { return {reinterpret_cast<byte *>(data()), size_bytes()}; }
+    { return span<byte, _Extent * sizeof(element_type)>{reinterpret_cast<byte *>(data()), size_bytes()}; }
 
 private:
     pointer    __data;
@@ -363,9 +370,7 @@ public:
     using reference              = _Tp &;
     using const_reference        = const _Tp &;
     using iterator               =  __wrap_iter<pointer>;
-    using const_iterator         =  __wrap_iter<const_pointer>;
     using reverse_iterator       = _VSTD::reverse_iterator<iterator>;
-    using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>;
 
     static constexpr size_type extent = dynamic_extent;
 
@@ -382,13 +387,15 @@ public:
     _LIBCPP_INLINE_VISIBILITY
     constexpr span(element_type (&__arr)[_Sz])          noexcept : __data{__arr}, __size{_Sz} {}
 
-    template <size_t _Sz>
+    template <class _OtherElementType, size_t _Sz,
+              enable_if_t<is_convertible_v<_OtherElementType(*)[], element_type (*)[]>, nullptr_t> = nullptr>
     _LIBCPP_INLINE_VISIBILITY
-    constexpr span(array<value_type, _Sz>& __arr)       noexcept : __data{__arr.data()}, __size{_Sz} {}
+    constexpr span(array<_OtherElementType, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {}
 
-    template <size_t _Sz>
+    template <class _OtherElementType, size_t _Sz,
+              enable_if_t<is_convertible_v<const _OtherElementType(*)[], element_type (*)[]>, nullptr_t> = nullptr>
     _LIBCPP_INLINE_VISIBILITY
-    constexpr span(const array<value_type, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {}
+    constexpr span(const array<_OtherElementType, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {}
 
     template <class _Container>
     _LIBCPP_INLINE_VISIBILITY
@@ -418,7 +425,7 @@ public:
     constexpr span<element_type, _Count> first() const noexcept
     {
         _LIBCPP_ASSERT(_Count <= size(), "Count out of range in span::first()");
-        return {data(), _Count};
+        return span<element_type, _Count>{data(), _Count};
     }
 
     template <size_t _Count>
@@ -426,7 +433,7 @@ public:
     constexpr span<element_type, _Count> last() const noexcept
     {
         _LIBCPP_ASSERT(_Count <= size(), "Count out of range in span::last()");
-        return {data() + size() - _Count, _Count};
+        return span<element_type, _Count>{data() + size() - _Count, _Count};
     }
 
     _LIBCPP_INLINE_VISIBILITY
@@ -445,11 +452,11 @@ public:
 
     template <size_t _Offset, size_t _Count = dynamic_extent>
     _LIBCPP_INLINE_VISIBILITY
-    constexpr span<_Tp, dynamic_extent> subspan() const noexcept
+    constexpr span<element_type, _Count> subspan() const noexcept
     {
         _LIBCPP_ASSERT(_Offset <= size(), "Offset out of range in span::subspan()");
-        _LIBCPP_ASSERT(_Count == dynamic_extent || _Offset + _Count <= size(), "Count out of range in span::subspan()");
-        return {data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
+        _LIBCPP_ASSERT(_Count == dynamic_extent || _Count <= size() - _Offset, "Offset + count out of range in span::subspan()");
+        return span<element_type, _Count>{data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
     }
 
     constexpr span<element_type, dynamic_extent>
@@ -460,7 +467,7 @@ public:
         _LIBCPP_ASSERT(__count  <= size() || __count == dynamic_extent, "count out of range in span::subspan(offset, count)");
         if (__count == dynamic_extent)
             return {data() + __offset, size() - __offset};
-        _LIBCPP_ASSERT(__offset <= size() - __count, "Offset + count out of range in span::subspan(offset, count)");
+        _LIBCPP_ASSERT(__count <= size() - __offset, "Offset + count out of range in span::subspan(offset, count)");
         return {data() + __offset, __count};
     }
 
@@ -470,7 +477,7 @@ public:
 
     _LIBCPP_INLINE_VISIBILITY constexpr reference operator[](size_type __idx) const noexcept
     {
-        _LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T>[] index out of bounds");
+        _LIBCPP_ASSERT(__idx < size(), "span<T>[] index out of bounds");
         return __data[__idx];
     }
 
@@ -492,23 +499,8 @@ public:
 // [span.iter], span iterator support
     _LIBCPP_INLINE_VISIBILITY constexpr iterator                 begin() const noexcept { return iterator(data()); }
     _LIBCPP_INLINE_VISIBILITY constexpr iterator                   end() const noexcept { return iterator(data() + size()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator          cbegin() const noexcept { return const_iterator(data()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator            cend() const noexcept { return const_iterator(data() + size()); }
     _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator        rbegin() const noexcept { return reverse_iterator(end()); }
     _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator          rend() const noexcept { return reverse_iterator(begin()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(cend()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator   crend() const noexcept { return const_reverse_iterator(cbegin()); }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr void swap(span &__other) noexcept
-    {
-        pointer __p = __data;
-        __data = __other.__data;
-        __other.__data = __p;
-
-        size_type __sz = __size;
-        __size = __other.__size;
-        __other.__size = __sz;
-    }
 
     _LIBCPP_INLINE_VISIBILITY span<const byte, dynamic_extent> __as_bytes() const noexcept
     { return {reinterpret_cast<const byte *>(data()), size_bytes()}; }
@@ -521,34 +513,6 @@ private:
     size_type __size;
 };
 
-//  tuple interface
-template <class _Tp, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<span<_Tp, _Size>>
-    : public integral_constant<size_t, _Size> {};
-
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<span<_Tp, dynamic_extent>>; // declared but not defined
-
-
-template <size_t _Ip, class _Tp, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, span<_Tp, _Size>>
-{
-    static_assert( dynamic_extent != _Size, "std::tuple_element<> not supported for std::span<T, dynamic_extent>");
-    static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::span)");
-    typedef _Tp type;
-};
-
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY constexpr
-_Tp&
-get(span<_Tp, _Size> __s) noexcept
-{
-    static_assert( dynamic_extent != _Size, "std::get<> not supported for std::span<T, dynamic_extent>");
-    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::span)");
-    return __s[_Ip];
-}
-
-
 //  as_bytes & as_writable_bytes
 template <class _Tp, size_t _Extent>
 _LIBCPP_INLINE_VISIBILITY
@@ -562,12 +526,6 @@ auto as_writable_bytes(span<_Tp, _Extent> __s) noexcept
 -> enable_if_t<!is_const_v<_Tp>, decltype(__s.__as_writable_bytes())>
 { return __s.__as_writable_bytes(); }
 
-template <class _Tp, size_t _Extent>
-_LIBCPP_INLINE_VISIBILITY
-constexpr void swap(span<_Tp, _Extent> &__lhs, span<_Tp, _Extent> &__rhs) noexcept
-{ __lhs.swap(__rhs); }
-
-
 //  Deduction guides
 template<class _Tp, size_t _Sz>
     span(_Tp (&)[_Sz]) -> span<_Tp, _Sz>;
diff --git a/gnu/llvm/libcxx/include/stddef.h b/gnu/llvm/libcxx/include/stddef.h
index 6497dcda2af..35c680b4f9a 100644
--- a/gnu/llvm/libcxx/include/stddef.h
+++ b/gnu/llvm/libcxx/include/stddef.h
@@ -31,7 +31,7 @@ Types:
 
     ptrdiff_t
     size_t
-    max_align_t
+    max_align_t // C++11
     nullptr_t
 
 */
@@ -51,12 +51,6 @@ extern "C++" {
 using std::nullptr_t;
 }
 
-// Re-use the compiler's <stddef.h> max_align_t where possible.
-#if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T) && \
-    !defined(__DEFINED_max_align_t) && !defined(__NetBSD__)
-typedef long double max_align_t;
-#endif
-
 #endif
 
 #endif  // _LIBCPP_STDDEF_H
diff --git a/gnu/llvm/libcxx/include/stdexcept b/gnu/llvm/libcxx/include/stdexcept
index 481f9043c50..7a7f3679409 100644
--- a/gnu/llvm/libcxx/include/stdexcept
+++ b/gnu/llvm/libcxx/include/stdexcept
@@ -129,6 +129,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit domain_error(const char* __s)   : logic_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    domain_error(const domain_error&) _NOEXCEPT = default;
     virtual ~domain_error() _NOEXCEPT;
 #endif
 };
@@ -141,6 +142,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit invalid_argument(const char* __s)   : logic_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    invalid_argument(const invalid_argument&) _NOEXCEPT = default;
     virtual ~invalid_argument() _NOEXCEPT;
 #endif
 };
@@ -152,6 +154,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit length_error(const string& __s) : logic_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit length_error(const char* __s)   : logic_error(__s) {}
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    length_error(const length_error&) _NOEXCEPT = default;
     virtual ~length_error() _NOEXCEPT;
 #endif
 };
@@ -164,6 +167,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit out_of_range(const char* __s)   : logic_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    out_of_range(const out_of_range&) _NOEXCEPT = default;
     virtual ~out_of_range() _NOEXCEPT;
 #endif
 };
@@ -176,6 +180,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit range_error(const char* __s)   : runtime_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    range_error(const range_error&) _NOEXCEPT = default;
     virtual ~range_error() _NOEXCEPT;
 #endif
 };
@@ -188,6 +193,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit overflow_error(const char* __s)   : runtime_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    overflow_error(const overflow_error&) _NOEXCEPT = default;
     virtual ~overflow_error() _NOEXCEPT;
 #endif
 };
@@ -200,6 +206,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit underflow_error(const char* __s)   : runtime_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    underflow_error(const underflow_error&) _NOEXCEPT = default;
     virtual ~underflow_error() _NOEXCEPT;
 #endif
 };
diff --git a/gnu/llvm/libcxx/include/string b/gnu/llvm/libcxx/include/string
index 8a0ac844470..2f846eda06c 100644
--- a/gnu/llvm/libcxx/include/string
+++ b/gnu/llvm/libcxx/include/string
@@ -437,9 +437,11 @@ basic_istream<charT, traits>&
 getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);
 
 template<class charT, class traits, class Allocator, class U>
-void erase(basic_string<charT, traits, Allocator>& c, const U& value); // C++20
+typename basic_string<charT, traits, Allocator>::size_type
+erase(basic_string<charT, traits, Allocator>& c, const U& value);    // C++20
 template<class charT, class traits, class Allocator, class Predicate>
-void erase_if(basic_string<charT, traits, Allocator>& c, Predicate pred); // C++20
+typename basic_string<charT, traits, Allocator>::size_type
+erase_if(basic_string<charT, traits, Allocator>& c, Predicate pred); // C++20
 
 typedef basic_string<char>    string;
 typedef basic_string<wchar_t> wstring;
@@ -643,9 +645,10 @@ struct __libcpp_string_gets_noexcept_iterator
     : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value || __libcpp_string_gets_noexcept_iterator_impl<_Iter>::value) {};
 
 template <class _CharT, class _Traits, class _Tp>
-struct __can_be_converted_to_string_view : public _LIBCPP_BOOL_CONSTANT(
-    ( is_convertible<const _Tp&, basic_string_view<_CharT, _Traits> >::value &&
-     !is_convertible<const _Tp&, const _CharT*>::value)) {};
+struct __can_be_converted_to_string_view : public _BoolConstant<
+      is_convertible<const _Tp&, basic_string_view<_CharT, _Traits> >::value &&
+     !is_convertible<const _Tp&, const _CharT*>::value
+    > {};
 
 #ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
 
@@ -688,13 +691,8 @@ public:
     static_assert(( is_same<typename allocator_type::value_type, value_type>::value),
                   "Allocator::value_type must be same type as value_type");
 
-#if defined(_LIBCPP_RAW_ITERATORS)
-    typedef pointer                                      iterator;
-    typedef const_pointer                                const_iterator;
-#else  // defined(_LIBCPP_RAW_ITERATORS)
     typedef __wrap_iter<pointer>                         iterator;
     typedef __wrap_iter<const_pointer>                   const_iterator;
-#endif  // defined(_LIBCPP_RAW_ITERATORS)
     typedef _VSTD::reverse_iterator<iterator>             reverse_iterator;
     typedef _VSTD::reverse_iterator<const_iterator>       const_reverse_iterator;
 
@@ -784,6 +782,7 @@ private:
     __compressed_pair<__rep, allocator_type> __r_;
 
 public:
+    _LIBCPP_FUNC_VIS
     static const size_type npos = -1;
 
     _LIBCPP_INLINE_VISIBILITY basic_string()
@@ -812,7 +811,7 @@ public:
     basic_string(basic_string&& __str, const allocator_type& __a);
 #endif  // _LIBCPP_CXX03_LANG
 
-    template <class = typename enable_if<__is_allocator<_Allocator>::value, nullptr_t>::type>
+    template <class = _EnableIf<__is_allocator<_Allocator>::value, nullptr_t> >
     _LIBCPP_INLINE_VISIBILITY
     basic_string(const _CharT* __s) : __r_(__default_init_tag(), __default_init_tag()) {
       _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*) detected nullptr");
@@ -822,7 +821,7 @@ public:
 #   endif
     }
 
-    template <class = typename enable_if<__is_allocator<_Allocator>::value, nullptr_t>::type>
+    template <class = _EnableIf<__is_allocator<_Allocator>::value, nullptr_t> >
         _LIBCPP_INLINE_VISIBILITY
         basic_string(const _CharT* __s, const _Allocator& __a);
 
@@ -833,7 +832,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY
     basic_string(size_type __n, _CharT __c);
 
-    template <class = typename enable_if<__is_allocator<_Allocator>::value, nullptr_t>::type>
+    template <class = _EnableIf<__is_allocator<_Allocator>::value, nullptr_t> >
         _LIBCPP_INLINE_VISIBILITY
         basic_string(size_type __n, _CharT __c, const _Allocator& __a);
 
@@ -843,23 +842,24 @@ public:
     basic_string(const basic_string& __str, size_type __pos,
                  const _Allocator& __a = _Allocator());
 
-    template<class _Tp, class = typename enable_if<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, void>::type>
+    template<class _Tp, class = _EnableIf<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value && !__is_same_uncvref<_Tp, basic_string>::value> >
         _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
         basic_string(const _Tp& __t, size_type __pos, size_type __n,
-                              const allocator_type& __a = allocator_type());
+                     const allocator_type& __a = allocator_type());
 
-    template<class _Tp, class = typename enable_if<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, void>::type>
+    template<class _Tp, class = _EnableIf<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
+                                          !__is_same_uncvref<_Tp, basic_string>::value> >
         _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
         explicit basic_string(const _Tp& __t);
 
-    template<class _Tp, class = typename enable_if<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, void>::type>
+    template<class _Tp, class = _EnableIf<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value && !__is_same_uncvref<_Tp, basic_string>::value> >
         _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
         explicit basic_string(const _Tp& __t, const allocator_type& __a);
 
-    template<class _InputIterator, class = typename enable_if<__is_cpp17_input_iterator<_InputIterator>::value>::type>
+    template<class _InputIterator, class = _EnableIf<__is_cpp17_input_iterator<_InputIterator>::value> >
         _LIBCPP_INLINE_VISIBILITY
         basic_string(_InputIterator __first, _InputIterator __last);
-    template<class _InputIterator, class = typename enable_if<__is_cpp17_input_iterator<_InputIterator>::value>::type>
+    template<class _InputIterator, class = _EnableIf<__is_cpp17_input_iterator<_InputIterator>::value> >
         _LIBCPP_INLINE_VISIBILITY
         basic_string(_InputIterator __first, _InputIterator __last, const allocator_type& __a);
 #ifndef _LIBCPP_CXX03_LANG
@@ -876,7 +876,7 @@ public:
 
     basic_string& operator=(const basic_string& __str);
 
-    template <class _Tp, class = typename enable_if<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, void>::type>
+    template <class _Tp, class = _EnableIf<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value && !__is_same_uncvref<_Tp, basic_string>::value> >
     basic_string& operator=(const _Tp& __t)
         {__self_view __sv = __t; return assign(__sv);}
 
@@ -976,11 +976,12 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
+            && !__is_same_uncvref<_Tp, basic_string >::value,
             basic_string&
-        >::type
+        >
                                             operator+=(const _Tp& __t)            {__self_view __sv = __t; return append(__sv);}
     _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const value_type* __s)     {return append(__s);}
     _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(value_type __c)            {push_back(__c); return *this;}
@@ -993,21 +994,22 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
-        <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+    _EnableIf<
+            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
+            && !__is_same_uncvref<_Tp, basic_string>::value,
             basic_string&
-        >::type
+        >
                   append(const _Tp& __t) { __self_view __sv = __t; return append(__sv.data(), __sv.size()); }
     basic_string& append(const basic_string& __str, size_type __pos, size_type __n=npos);
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
+            && !__is_same_uncvref<_Tp, basic_string>::value,
             basic_string&
-        >::type
+        >
                   append(const _Tp& __t, size_type __pos, size_type __n=npos);
     basic_string& append(const value_type* __s, size_type __n);
     basic_string& append(const value_type* __s);
@@ -1021,12 +1023,12 @@ public:
     basic_string& __append_forward_unsafe(_ForwardIterator, _ForwardIterator);
     template<class _InputIterator>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __is_exactly_cpp17_input_iterator<_InputIterator>::value
                 || !__libcpp_string_gets_noexcept_iterator<_InputIterator>::value,
             basic_string&
-        >::type
+        >
     _LIBCPP_INLINE_VISIBILITY
     append(_InputIterator __first, _InputIterator __last) {
       const basic_string __temp (__first, __last, __alloc());
@@ -1035,12 +1037,12 @@ public:
     }
     template<class _ForwardIterator>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __is_cpp17_forward_iterator<_ForwardIterator>::value
                 && __libcpp_string_gets_noexcept_iterator<_ForwardIterator>::value,
             basic_string&
-        >::type
+        >
     _LIBCPP_INLINE_VISIBILITY
     append(_ForwardIterator __first, _ForwardIterator __last) {
       return __append_forward_unsafe(__first, __last);
@@ -1061,11 +1063,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             basic_string&
-        >::type
+        >
                  assign(const _Tp & __t) { __self_view __sv = __t; return assign(__sv.data(), __sv.size()); }
     _LIBCPP_INLINE_VISIBILITY
     basic_string& assign(const basic_string& __str) { return *this = __str; }
@@ -1078,32 +1080,33 @@ public:
     basic_string& assign(const basic_string& __str, size_type __pos, size_type __n=npos);
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
+            && !__is_same_uncvref<_Tp, basic_string>::value,
             basic_string&
-        >::type
+        >
                   assign(const _Tp & __t, size_type __pos, size_type __n=npos);
     basic_string& assign(const value_type* __s, size_type __n);
     basic_string& assign(const value_type* __s);
     basic_string& assign(size_type __n, value_type __c);
     template<class _InputIterator>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
            __is_exactly_cpp17_input_iterator<_InputIterator>::value
                 || !__libcpp_string_gets_noexcept_iterator<_InputIterator>::value,
             basic_string&
-        >::type
+        >
         assign(_InputIterator __first, _InputIterator __last);
     template<class _ForwardIterator>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __is_cpp17_forward_iterator<_ForwardIterator>::value
                  && __libcpp_string_gets_noexcept_iterator<_ForwardIterator>::value,
             basic_string&
-        >::type
+        >
         assign(_ForwardIterator __first, _ForwardIterator __last);
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
@@ -1115,21 +1118,21 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             basic_string&
-        >::type
+        >
                  insert(size_type __pos1, const _Tp& __t)
     { __self_view __sv = __t; return insert(__pos1, __sv.data(), __sv.size()); }
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value && !__is_same_uncvref<_Tp, basic_string>::value,
             basic_string&
-        >::type
+        >
                   insert(size_type __pos1, const _Tp& __t, size_type __pos2, size_type __n=npos);
     basic_string& insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n=npos);
     basic_string& insert(size_type __pos, const value_type* __s, size_type __n);
@@ -1140,21 +1143,21 @@ public:
     iterator      insert(const_iterator __pos, size_type __n, value_type __c);
     template<class _InputIterator>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
            __is_exactly_cpp17_input_iterator<_InputIterator>::value
                 || !__libcpp_string_gets_noexcept_iterator<_InputIterator>::value,
             iterator
-        >::type
+        >
         insert(const_iterator __pos, _InputIterator __first, _InputIterator __last);
     template<class _ForwardIterator>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __is_cpp17_forward_iterator<_ForwardIterator>::value
                  && __libcpp_string_gets_noexcept_iterator<_ForwardIterator>::value,
             iterator
-        >::type
+        >
         insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last);
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
@@ -1173,20 +1176,20 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             basic_string&
-        >::type
+        >
                   replace(size_type __pos1, size_type __n1, const _Tp& __t) { __self_view __sv = __t; return replace(__pos1, __n1, __sv.data(), __sv.size()); }
     basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2=npos);
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string>::value,
             basic_string&
-        >::type
+        >
                   replace(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2=npos);
     basic_string& replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2);
     basic_string& replace(size_type __pos, size_type __n1, const value_type* __s);
@@ -1196,11 +1199,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             basic_string&
-        >::type
+        >
                   replace(const_iterator __i1, const_iterator __i2, const _Tp& __t) { __self_view __sv = __t; return replace(__i1 - begin(), __i2 - __i1, __sv); }
 
     _LIBCPP_INLINE_VISIBILITY
@@ -1211,11 +1214,11 @@ public:
     basic_string& replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c);
     template<class _InputIterator>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __is_cpp17_input_iterator<_InputIterator>::value,
             basic_string&
-        >::type
+        >
         replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2);
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
@@ -1253,11 +1256,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             size_type
-        >::type
+        >
               find(const _Tp& __t, size_type __pos = 0) const;
     size_type find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_INLINE_VISIBILITY
@@ -1269,11 +1272,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             size_type
-        >::type
+        >
               rfind(const _Tp& __t, size_type __pos = npos) const;
     size_type rfind(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_INLINE_VISIBILITY
@@ -1285,11 +1288,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             size_type
-        >::type
+        >
               find_first_of(const _Tp& __t, size_type __pos = 0) const;
     size_type find_first_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_INLINE_VISIBILITY
@@ -1302,11 +1305,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             size_type
-        >::type
+        >
               find_last_of(const _Tp& __t, size_type __pos = npos) const;
     size_type find_last_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_INLINE_VISIBILITY
@@ -1319,11 +1322,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             size_type
-        >::type
+        >
               find_first_not_of(const _Tp &__t, size_type __pos = 0) const;
     size_type find_first_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_INLINE_VISIBILITY
@@ -1336,11 +1339,11 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             size_type
-        >::type
+        >
               find_last_not_of(const _Tp& __t, size_type __pos = npos) const;
     size_type find_last_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
     _LIBCPP_INLINE_VISIBILITY
@@ -1353,20 +1356,20 @@ public:
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             int
-        >::type
+        >
         compare(const _Tp &__t) const;
 
     template <class _Tp>
     _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
-    typename enable_if
+    _EnableIf
         <
             __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
             int
-        >::type
+        >
          compare(size_type __pos1, size_type __n1, const _Tp& __t) const;
 
     _LIBCPP_INLINE_VISIBILITY
@@ -1375,11 +1378,11 @@ public:
 
     template <class _Tp>
     inline _LIBCPP_INLINE_VISIBILITY
-        typename enable_if
+        _EnableIf
         <
-            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+            __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string>::value,
             int
-        >::type
+        >
         compare(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2=npos) const;
     int compare(const value_type* __s) const _NOEXCEPT;
     int compare(size_type __pos1, size_type __n1, const value_type* __s) const;
@@ -1543,22 +1546,30 @@ private:
     inline
     void __init(size_type __n, value_type __c);
 
+    // Slow path for the (inlined) copy constructor for 'long' strings.
+    // Always externally instantiated and not inlined.
+    // Requires that __s is zero terminated.
+    // The main reason for this function to exist is because for unstable, we
+    // want to allow inlining of the copy constructor. However, we don't want
+    // to call the __init() functions as those are marked as inline which may
+    // result in over-aggressive inlining by the compiler, where our aim is
+    // to only inline the fast path code directly in the ctor.
+    void __init_copy_ctor_external(const value_type* __s, size_type __sz);
+
     template <class _InputIterator>
     inline
-    typename enable_if
+    _EnableIf
     <
-        __is_exactly_cpp17_input_iterator<_InputIterator>::value,
-        void
-    >::type
+        __is_exactly_cpp17_input_iterator<_InputIterator>::value
+    >
     __init(_InputIterator __first, _InputIterator __last);
 
     template <class _ForwardIterator>
     inline
-    typename enable_if
+    _EnableIf
     <
-        __is_cpp17_forward_iterator<_ForwardIterator>::value,
-        void
-    >::type
+        __is_cpp17_forward_iterator<_ForwardIterator>::value
+    >
     __init(_ForwardIterator __first, _ForwardIterator __last);
 
     void __grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
@@ -1567,9 +1578,19 @@ private:
                                size_type __n_copy,  size_type __n_del,
                                size_type __n_add, const value_type* __p_new_stuff);
 
+    // __assign_no_alias is invoked for assignment operations where we
+    // have proof that the input does not alias the current instance.
+    // For example, operator=(basic_string) performs a 'self' check.
+    template <bool __is_short>
+    basic_string& __assign_no_alias(const value_type* __s, size_type __n);
+
     _LIBCPP_INLINE_VISIBILITY
     void __erase_to_end(size_type __pos);
 
+    // __erase_external_with_move is invoked for erase() invocations where
+    // `n ~= npos`, likely requiring memory moves on the string data.
+    void __erase_external_with_move(size_type __pos, size_type __n);
+
     _LIBCPP_INLINE_VISIBILITY
     void __copy_assign_alloc(const basic_string& __str)
         {__copy_assign_alloc(__str, integral_constant<bool,
@@ -1638,6 +1659,19 @@ private:
         _NOEXCEPT
         {}
 
+    basic_string& __assign_external(const value_type* __s);
+    basic_string& __assign_external(const value_type* __s, size_type __n);
+
+    // Assigns the value in __s, guaranteed to be __n < __min_cap in length.
+    inline basic_string& __assign_short(const value_type* __s, size_type __n) {
+      pointer __p = __is_long()
+                        ? (__set_long_size(__n), __get_long_pointer())
+                        : (__set_short_size(__n), __get_short_pointer());
+      traits_type::move(_VSTD::__to_address(__p), __s, __n);
+      traits_type::assign(__p[__n], value_type());
+      return *this;
+    }
+
     _LIBCPP_INLINE_VISIBILITY void __invalidate_all_iterators();
     _LIBCPP_INLINE_VISIBILITY void __invalidate_iterators_past(size_type);
 
@@ -1648,12 +1682,23 @@ private:
     friend basic_string operator+<>(const basic_string&, value_type);
 };
 
+// These declarations must appear before any functions are implicitly used
+// so that they have the correct visibility specifier.
+#ifdef _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
+_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE, char)
+_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE, wchar_t)
+#else
+_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE, char)
+_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE, wchar_t)
+#endif
+
+
 #ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
 template<class _InputIterator,
          class _CharT = typename iterator_traits<_InputIterator>::value_type,
          class _Allocator = allocator<_CharT>,
-         class = typename enable_if<__is_cpp17_input_iterator<_InputIterator>::value, void>::type,
-         class = typename enable_if<__is_allocator<_Allocator>::value, void>::type
+         class = _EnableIf<__is_cpp17_input_iterator<_InputIterator>::value>,
+         class = _EnableIf<__is_allocator<_Allocator>::value>
          >
 basic_string(_InputIterator, _InputIterator, _Allocator = _Allocator())
   -> basic_string<_CharT, char_traits<_CharT>, _Allocator>;
@@ -1661,7 +1706,7 @@ basic_string(_InputIterator, _InputIterator, _Allocator = _Allocator())
 template<class _CharT,
          class _Traits,
          class _Allocator = allocator<_CharT>,
-         class = typename enable_if<__is_allocator<_Allocator>::value, void>::type
+         class = _EnableIf<__is_allocator<_Allocator>::value>
          >
 explicit basic_string(basic_string_view<_CharT, _Traits>, const _Allocator& = _Allocator())
   -> basic_string<_CharT, _Traits, _Allocator>;
@@ -1669,14 +1714,13 @@ explicit basic_string(basic_string_view<_CharT, _Traits>, const _Allocator& = _A
 template<class _CharT,
          class _Traits,
          class _Allocator = allocator<_CharT>,
-         class = typename enable_if<__is_allocator<_Allocator>::value, void>::type,
+         class = _EnableIf<__is_allocator<_Allocator>::value>,
          class _Sz = typename allocator_traits<_Allocator>::size_type
          >
 basic_string(basic_string_view<_CharT, _Traits>, _Sz, _Sz, const _Allocator& = _Allocator())
   -> basic_string<_CharT, _Traits, _Allocator>;
 #endif
 
-
 template <class _CharT, class _Traits, class _Allocator>
 inline
 void
@@ -1837,7 +1881,9 @@ basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __st
     if (!__str.__is_long())
         __r_.first().__r = __str.__r_.first().__r;
     else
-        __init(_VSTD::__to_address(__str.__get_long_pointer()), __str.__get_long_size());
+        __init_copy_ctor_external(_VSTD::__to_address(__str.__get_long_pointer()),
+                                  __str.__get_long_size());
+
 #if _LIBCPP_DEBUG_LEVEL >= 2
     __get_db()->__insert_c(this);
 #endif
@@ -1851,12 +1897,32 @@ basic_string<_CharT, _Traits, _Allocator>::basic_string(
     if (!__str.__is_long())
         __r_.first().__r = __str.__r_.first().__r;
     else
-        __init(_VSTD::__to_address(__str.__get_long_pointer()), __str.__get_long_size());
+        __init_copy_ctor_external(_VSTD::__to_address(__str.__get_long_pointer()),
+                                  __str.__get_long_size());
 #if _LIBCPP_DEBUG_LEVEL >= 2
     __get_db()->__insert_c(this);
 #endif
 }
 
+template <class _CharT, class _Traits, class _Allocator>
+void basic_string<_CharT, _Traits, _Allocator>::__init_copy_ctor_external(
+    const value_type* __s, size_type __sz) {
+  pointer __p;
+  if (__sz < __min_cap) {
+    __p = __get_short_pointer();
+    __set_short_size(__sz);
+  } else {
+    if (__sz > max_size())
+      this->__throw_length_error();
+    size_t __cap = __recommend(__sz);
+    __p = __alloc_traits::allocate(__alloc(), __cap + 1);
+    __set_long_pointer(__p);
+    __set_long_cap(__cap + 1);
+    __set_long_size(__sz);
+  }
+  traits_type::copy(_VSTD::__to_address(__p), __s, __sz + 1);
+}
+
 #ifndef _LIBCPP_CXX03_LANG
 
 template <class _CharT, class _Traits, class _Allocator>
@@ -2014,11 +2080,10 @@ basic_string<_CharT, _Traits, _Allocator>::basic_string(const _Tp & __t, const _
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _InputIterator>
-typename enable_if
+_EnableIf
 <
-    __is_exactly_cpp17_input_iterator<_InputIterator>::value,
-    void
->::type
+    __is_exactly_cpp17_input_iterator<_InputIterator>::value
+>
 basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last)
 {
     __zero();
@@ -2041,11 +2106,10 @@ basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _Input
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _ForwardIterator>
-typename enable_if
+_EnableIf
 <
-    __is_cpp17_forward_iterator<_ForwardIterator>::value,
-    void
->::type
+    __is_cpp17_forward_iterator<_ForwardIterator>::value
+>
 basic_string<_CharT, _Traits, _Allocator>::__init(_ForwardIterator __first, _ForwardIterator __last)
 {
     size_type __sz = static_cast<size_type>(_VSTD::distance(__first, __last));
@@ -2197,26 +2261,51 @@ basic_string<_CharT, _Traits, _Allocator>::__grow_by(size_type __old_cap, size_t
 
 // assign
 
+template <class _CharT, class _Traits, class _Allocator>
+template <bool __is_short>
+basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::__assign_no_alias(
+    const value_type* __s, size_type __n) {
+  size_type __cap = __is_short ? __min_cap : __get_long_cap();
+  if (__n < __cap) {
+    pointer __p = __is_short ? __get_short_pointer() : __get_long_pointer();
+    __is_short ? __set_short_size(__n) : __set_long_size(__n);
+    traits_type::copy(_VSTD::__to_address(__p), __s, __n);
+    traits_type::assign(__p[__n], value_type());
+    __invalidate_iterators_past(__n);
+  } else {
+    size_type __sz = __is_short ? __get_short_size() : __get_long_size();
+    __grow_by_and_replace(__cap - 1, __n - __cap + 1, __sz, 0, __sz, __n, __s);
+  }
+  return *this;
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::__assign_external(
+    const value_type* __s, size_type __n) {
+  size_type __cap = capacity();
+  if (__cap >= __n) {
+    value_type* __p = _VSTD::__to_address(__get_pointer());
+    traits_type::move(__p, __s, __n);
+    traits_type::assign(__p[__n], value_type());
+    __set_size(__n);
+    __invalidate_iterators_past(__n);
+  } else {
+    size_type __sz = size();
+    __grow_by_and_replace(__cap, __n - __cap, __sz, 0, __sz, __n, __s);
+  }
+  return *this;
+}
+
 template <class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s, size_type __n)
 {
     _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::assign received nullptr");
-    size_type __cap = capacity();
-    if (__cap >= __n)
-    {
-        value_type* __p = _VSTD::__to_address(__get_pointer());
-        traits_type::move(__p, __s, __n);
-        traits_type::assign(__p[__n], value_type());
-        __set_size(__n);
-        __invalidate_iterators_past(__n);
-    }
-    else
-    {
-        size_type __sz = size();
-        __grow_by_and_replace(__cap, __n - __cap, __sz, 0, __sz, __n, __s);
-    }
-    return *this;
+    return (_LIBCPP_BUILTIN_CONSTANT_P(__n) && __n < __min_cap)
+               ? __assign_short(__s, __n)
+               : __assign_external(__s, __n);
 }
 
 template <class _CharT, class _Traits, class _Allocator>
@@ -2263,12 +2352,19 @@ template <class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::operator=(const basic_string& __str)
 {
-    if (this != &__str)
-    {
-        __copy_assign_alloc(__str);
-        return assign(__str.data(), __str.size());
+  if (this != &__str) {
+    __copy_assign_alloc(__str);
+    if (!__is_long()) {
+      if (!__str.__is_long()) {
+        __r_.first().__r = __str.__r_.first().__r;
+      } else {
+        return __assign_no_alias<true>(__str.data(), __str.size());
+      }
+    } else {
+      return __assign_no_alias<false>(__str.data(), __str.size());
     }
-    return *this;
+  }
+  return *this;
 }
 
 #ifndef _LIBCPP_CXX03_LANG
@@ -2326,12 +2422,12 @@ basic_string<_CharT, _Traits, _Allocator>::operator=(basic_string&& __str)
 
 template <class _CharT, class _Traits, class _Allocator>
 template<class _InputIterator>
-typename enable_if
+_EnableIf
 <
      __is_exactly_cpp17_input_iterator <_InputIterator>::value
           || !__libcpp_string_gets_noexcept_iterator<_InputIterator>::value,
     basic_string<_CharT, _Traits, _Allocator>&
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::assign(_InputIterator __first, _InputIterator __last)
 {
     const basic_string __temp(__first, __last, __alloc());
@@ -2341,12 +2437,12 @@ basic_string<_CharT, _Traits, _Allocator>::assign(_InputIterator __first, _Input
 
 template <class _CharT, class _Traits, class _Allocator>
 template<class _ForwardIterator>
-typename enable_if
+_EnableIf
 <
     __is_cpp17_forward_iterator<_ForwardIterator>::value
          && __libcpp_string_gets_noexcept_iterator<_ForwardIterator>::value,
     basic_string<_CharT, _Traits, _Allocator>&
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last)
 {
     size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
@@ -2378,11 +2474,12 @@ basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str, siz
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
+    && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
     basic_string<_CharT, _Traits, _Allocator>&
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::assign(const _Tp & __t, size_type __pos, size_type __n)
 {
     __self_view __sv = __t;
@@ -2393,14 +2490,23 @@ basic_string<_CharT, _Traits, _Allocator>::assign(const _Tp & __t, size_type __p
 }
 
 
+template <class _CharT, class _Traits, class _Allocator>
+basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::__assign_external(const value_type* __s) {
+  return __assign_external(__s, traits_type::length(__s));
+}
+
 template <class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>&
 basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s)
 {
     _LIBCPP_ASSERT(__s != nullptr, "string::assign received nullptr");
-    return assign(__s, traits_type::length(__s));
+    return _LIBCPP_BUILTIN_CONSTANT_P(*__s)
+               ? (traits_type::length(__s) < __min_cap
+                      ? __assign_short(__s, traits_type::length(__s))
+                      : __assign_external(__s, traits_type::length(__s)))
+               : __assign_external(__s);
 }
-
 // append
 
 template <class _CharT, class _Traits, class _Allocator>
@@ -2565,11 +2671,11 @@ basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str, siz
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-    typename enable_if
+    _EnableIf
     <
-        __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+        __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
         basic_string<_CharT, _Traits, _Allocator>&
-    >::type
+    >
 basic_string<_CharT, _Traits, _Allocator>::append(const _Tp & __t, size_type __pos, size_type __n)
 {
     __self_view __sv = __t;
@@ -2654,12 +2760,12 @@ basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, size_type __n
 
 template <class _CharT, class _Traits, class _Allocator>
 template<class _InputIterator>
-typename enable_if
+_EnableIf
 <
    __is_exactly_cpp17_input_iterator<_InputIterator>::value
         || !__libcpp_string_gets_noexcept_iterator<_InputIterator>::value,
    typename basic_string<_CharT, _Traits, _Allocator>::iterator
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _InputIterator __first, _InputIterator __last)
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -2673,12 +2779,12 @@ basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _InputIt
 
 template <class _CharT, class _Traits, class _Allocator>
 template<class _ForwardIterator>
-typename enable_if
+_EnableIf
 <
     __is_cpp17_forward_iterator<_ForwardIterator>::value
         && __libcpp_string_gets_noexcept_iterator<_ForwardIterator>::value,
     typename basic_string<_CharT, _Traits, _Allocator>::iterator
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last)
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -2743,11 +2849,11 @@ basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const basic_
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value  && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
     basic_string<_CharT, _Traits, _Allocator>&
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const _Tp& __t,
                                                   size_type __pos2, size_type __n)
 {
@@ -2852,8 +2958,8 @@ basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __
         }
         traits_type::move(__p + __pos, __s, __n2);
 __finish:
-// __sz += __n2 - __n1; in this and the below function below can cause unsigned integer overflow,
-// but this is a safe operation, so we disable the check.
+// __sz += __n2 - __n1; in this and the below function below can cause unsigned
+// integer overflow, but this is a safe operation, so we disable the check.
         __sz += __n2 - __n1;
         __set_size(__sz);
         __invalidate_iterators_past(__sz);
@@ -2900,11 +3006,11 @@ basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __
 
 template <class _CharT, class _Traits, class _Allocator>
 template<class _InputIterator>
-typename enable_if
+_EnableIf
 <
     __is_cpp17_input_iterator<_InputIterator>::value,
     basic_string<_CharT, _Traits, _Allocator>&
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2,
                                                    _InputIterator __j1, _InputIterator __j2)
 {
@@ -2933,11 +3039,11 @@ basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type _
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
     basic_string<_CharT, _Traits, _Allocator>&
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const _Tp& __t,
                                                    size_type __pos2, size_type __n2)
 {
@@ -2991,15 +3097,16 @@ basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_it
 
 // erase
 
+// 'externally instantiated' erase() implementation, called when __n != npos.
+// Does not check __pos against size()
 template <class _CharT, class _Traits, class _Allocator>
-basic_string<_CharT, _Traits, _Allocator>&
-basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos, size_type __n)
+void
+basic_string<_CharT, _Traits, _Allocator>::__erase_external_with_move(
+    size_type __pos, size_type __n)
 {
-    size_type __sz = size();
-    if (__pos > __sz)
-        this->__throw_out_of_range();
     if (__n)
     {
+        size_type __sz = size();
         value_type* __p = _VSTD::__to_address(__get_pointer());
         __n = _VSTD::min(__n, __sz - __pos);
         size_type __n_move = __sz - __pos - __n;
@@ -3010,7 +3117,19 @@ basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos, size_type __n)
         __invalidate_iterators_past(__sz);
         traits_type::assign(__p[__sz], value_type());
     }
-    return *this;
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+basic_string<_CharT, _Traits, _Allocator>&
+basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos,
+                                                 size_type __n) {
+  if (__pos > size()) this->__throw_out_of_range();
+  if (__n == npos) {
+    __erase_to_end(__pos);
+  } else {
+    __erase_external_with_move(__pos, __n);
+  }
+  return *this;
 }
 
 template <class _CharT, class _Traits, class _Allocator>
@@ -3356,11 +3475,11 @@ basic_string<_CharT, _Traits, _Allocator>::find(const basic_string& __str,
 
 template<class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     typename basic_string<_CharT, _Traits, _Allocator>::size_type
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::find(const _Tp &__t,
                                                 size_type __pos) const
 {
@@ -3414,11 +3533,11 @@ basic_string<_CharT, _Traits, _Allocator>::rfind(const basic_string& __str,
 
 template<class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     typename basic_string<_CharT, _Traits, _Allocator>::size_type
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::rfind(const _Tp& __t,
                                                 size_type __pos) const
 {
@@ -3472,11 +3591,11 @@ basic_string<_CharT, _Traits, _Allocator>::find_first_of(const basic_string& __s
 
 template<class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     typename basic_string<_CharT, _Traits, _Allocator>::size_type
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::find_first_of(const _Tp& __t,
                                                 size_type __pos) const
 {
@@ -3530,11 +3649,11 @@ basic_string<_CharT, _Traits, _Allocator>::find_last_of(const basic_string& __st
 
 template<class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     typename basic_string<_CharT, _Traits, _Allocator>::size_type
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::find_last_of(const _Tp& __t,
                                                 size_type __pos) const
 {
@@ -3588,11 +3707,11 @@ basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const basic_string&
 
 template<class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     typename basic_string<_CharT, _Traits, _Allocator>::size_type
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const _Tp& __t,
                                                 size_type __pos) const
 {
@@ -3647,11 +3766,11 @@ basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const basic_string&
 
 template<class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     typename basic_string<_CharT, _Traits, _Allocator>::size_type
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const _Tp& __t,
                                                 size_type __pos) const
 {
@@ -3685,11 +3804,11 @@ basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(value_type __c,
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     int
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::compare(const _Tp& __t) const
 {
     __self_view __sv = __t;
@@ -3739,11 +3858,11 @@ basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
     __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
     int
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                    size_type __n1,
                                                    const _Tp& __t) const
@@ -3764,11 +3883,12 @@ basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
 
 template <class _CharT, class _Traits, class _Allocator>
 template <class _Tp>
-typename enable_if
+_EnableIf
 <
-    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value,
+    __can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value
+    && !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
     int
->::type
+>
 basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                    size_type __n1,
                                                    const _Tp& __t,
@@ -4230,8 +4350,9 @@ _LIBCPP_FUNC_VIS wstring to_wstring(double __val);
 _LIBCPP_FUNC_VIS wstring to_wstring(long double __val);
 
 template<class _CharT, class _Traits, class _Allocator>
-    const typename basic_string<_CharT, _Traits, _Allocator>::size_type
-                   basic_string<_CharT, _Traits, _Allocator>::npos;
+_LIBCPP_FUNC_VIS
+const typename basic_string<_CharT, _Traits, _Allocator>::size_type
+               basic_string<_CharT, _Traits, _Allocator>::npos;
 
 template <class _CharT, class _Allocator>
 struct _LIBCPP_TEMPLATE_VIS
@@ -4283,15 +4404,25 @@ getline(basic_istream<_CharT, _Traits>&& __is,
 #endif  // _LIBCPP_CXX03_LANG
 
 #if _LIBCPP_STD_VER > 17
-template<class _CharT, class _Traits, class _Allocator, class _Up>
+template <class _CharT, class _Traits, class _Allocator, class _Up>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase(basic_string<_CharT, _Traits, _Allocator>& __str, const _Up& __v)
-{ __str.erase(_VSTD::remove(__str.begin(), __str.end(), __v), __str.end()); }
+    typename basic_string<_CharT, _Traits, _Allocator>::size_type
+    erase(basic_string<_CharT, _Traits, _Allocator>& __str, const _Up& __v) {
+  auto __old_size = __str.size();
+  __str.erase(_VSTD::remove(__str.begin(), __str.end(), __v), __str.end());
+  return __old_size - __str.size();
+}
 
-template<class _CharT, class _Traits, class _Allocator, class _Predicate>
+template <class _CharT, class _Traits, class _Allocator, class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(basic_string<_CharT, _Traits, _Allocator>& __str, _Predicate __pred)
-{ __str.erase(_VSTD::remove_if(__str.begin(), __str.end(), __pred), __str.end()); }
+    typename basic_string<_CharT, _Traits, _Allocator>::size_type
+    erase_if(basic_string<_CharT, _Traits, _Allocator>& __str,
+             _Predicate __pred) {
+  auto __old_size = __str.size();
+  __str.erase(_VSTD::remove_if(__str.begin(), __str.end(), __pred),
+              __str.end());
+  return __old_size - __str.size();
+}
 #endif
 
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -4330,9 +4461,6 @@ basic_string<_CharT, _Traits, _Allocator>::__subscriptable(const const_iterator*
 
 #endif  // _LIBCPP_DEBUG_LEVEL >= 2
 
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_string<char>)
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_string<wchar_t>)
-
 #if _LIBCPP_STD_VER > 11
 // Literal suffixes for basic_string [basic.string.literals]
 inline namespace literals
diff --git a/gnu/llvm/libcxx/include/system_error b/gnu/llvm/libcxx/include/system_error
index 05ef07950d0..74e889aa9ac 100644
--- a/gnu/llvm/libcxx/include/system_error
+++ b/gnu/llvm/libcxx/include/system_error
@@ -469,6 +469,7 @@ public:
     system_error(int __ev, const error_category& __ecat, const string& __what_arg);
     system_error(int __ev, const error_category& __ecat, const char* __what_arg);
     system_error(int __ev, const error_category& __ecat);
+    system_error(const system_error&) _NOEXCEPT = default;
     ~system_error() _NOEXCEPT;
 
     _LIBCPP_INLINE_VISIBILITY
diff --git a/gnu/llvm/libcxx/include/thread b/gnu/llvm/libcxx/include/thread
index 3b55342288d..6eff1800acd 100644
--- a/gnu/llvm/libcxx/include/thread
+++ b/gnu/llvm/libcxx/include/thread
@@ -241,12 +241,19 @@ public:
 #endif
     ~thread();
 
-#ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
-    thread(thread&& __t) _NOEXCEPT : __t_(__t.__t_) {__t.__t_ = _LIBCPP_NULL_THREAD;}
+    thread(thread&& __t) _NOEXCEPT : __t_(__t.__t_) {
+        __t.__t_ = _LIBCPP_NULL_THREAD;
+    }
+
     _LIBCPP_INLINE_VISIBILITY
-    thread& operator=(thread&& __t) _NOEXCEPT;
-#endif  // _LIBCPP_CXX03_LANG
+    thread& operator=(thread&& __t) _NOEXCEPT {
+        if (!__libcpp_thread_isnull(&__t_))
+            terminate();
+        __t_ = __t.__t_;
+        __t.__t_ = _LIBCPP_NULL_THREAD;
+        return *this;
+    }
 
     _LIBCPP_INLINE_VISIBILITY
     void swap(thread& __t) _NOEXCEPT {_VSTD::swap(__t_, __t.__t_);}
@@ -304,17 +311,6 @@ thread::thread(_Fp&& __f, _Args&&... __args)
         __throw_system_error(__ec, "thread constructor failed");
 }
 
-inline
-thread&
-thread::operator=(thread&& __t) _NOEXCEPT
-{
-    if (!__libcpp_thread_isnull(&__t_))
-        terminate();
-    __t_ = __t.__t_;
-    __t.__t_ = _LIBCPP_NULL_THREAD;
-    return *this;
-}
-
 #else  // _LIBCPP_CXX03_LANG
 
 template <class _Fp>
@@ -369,9 +365,9 @@ sleep_for(const chrono::duration<_Rep, _Period>& __d)
     {
 #if defined(_LIBCPP_COMPILER_GCC) && (__powerpc__ || __POWERPC__)
     //  GCC's long double const folding is incomplete for IBM128 long doubles.
-        _LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
-#else
         _LIBCPP_CONSTEXPR duration<long double> _Max = duration<long double>(ULLONG_MAX/1000000000ULL) ;
+#else
+        _LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
 #endif
         nanoseconds __ns;
         if (__d < _Max)
diff --git a/gnu/llvm/libcxx/include/type_traits b/gnu/llvm/libcxx/include/type_traits
index c0c3934afcc..be031037d67 100644
--- a/gnu/llvm/libcxx/include/type_traits
+++ b/gnu/llvm/libcxx/include/type_traits
@@ -544,6 +544,18 @@ template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp
 
 // is_same
 
+#if __has_keyword(__is_same)
+
+template <class _Tp, class _Up>
+struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp, class _Up>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v = __is_same(_Tp, _Up);
+#endif
+
+#else
+
 template <class _Tp, class _Up> struct _LIBCPP_TEMPLATE_VIS is_same           : public false_type {};
 template <class _Tp>            struct _LIBCPP_TEMPLATE_VIS is_same<_Tp, _Tp> : public true_type {};
 
@@ -553,6 +565,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v
     = is_same<_Tp, _Up>::value;
 #endif
 
+#endif // __is_same
+
 template <class _Tp, class _Up>
 using _IsSame = _BoolConstant<
 #ifdef __clang__
@@ -656,6 +670,18 @@ struct __two {char __lx[2];};
 
 // is_const
 
+#if __has_keyword(__is_const)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v = __is_const(_Tp);
+#endif
+
+#else
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const            : public false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {};
 
@@ -665,8 +691,22 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v
     = is_const<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_const)
+
 // is_volatile
 
+#if __has_keyword(__is_volatile)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v = __is_volatile(_Tp);
+#endif
+
+#else
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile               : public false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {};
 
@@ -676,37 +716,87 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v
     = is_volatile<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_volatile)
+
 // remove_const
 
+#if __has_keyword(__remove_const)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS remove_const {typedef __remove_const(_Tp) type;};
+
+#if _LIBCPP_STD_VER > 11
+template <class _Tp> using remove_const_t = __remove_const(_Tp);
+#endif
+
+#else
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const            {typedef _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;};
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type;
 #endif
 
+#endif // __has_keyword(__remove_const)
+
 // remove_volatile
 
+#if __has_keyword(__remove_volatile)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef __remove_volatile(_Tp) type;};
+
+#if _LIBCPP_STD_VER > 11
+template <class _Tp> using remove_volatile_t = __remove_volatile(_Tp);
+#endif
+
+#else
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile               {typedef _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile<volatile _Tp> {typedef _Tp type;};
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type;
 #endif
 
+#endif // __has_keyword(__remove_volatile)
+
 // remove_cv
 
+#if __has_keyword(__remove_cv)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS remove_cv {typedef __remove_cv(_Tp) type;};
+
+#if _LIBCPP_STD_VER > 11
+template <class _Tp> using remove_cv_t = __remove_cv(_Tp);
+#endif
+
+#else
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv
 {typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;};
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type;
 #endif
 
+#endif // __has_keyword(__remove_cv)
+
 // is_void
 
-template <class _Tp> struct __libcpp_is_void       : public false_type {};
-template <>          struct __libcpp_is_void<void> : public true_type {};
+#if __has_keyword(__is_void)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v = __is_void(_Tp);
+#endif
+
+#else
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void
-    : public __libcpp_is_void<typename remove_cv<_Tp>::type> {};
+    : public is_same<typename remove_cv<_Tp>::type, void> {};
 
 #if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
 template <class _Tp>
@@ -714,6 +804,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v
     = is_void<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_void)
+
 // __is_nullptr_t
 
 template <class _Tp> struct __is_nullptr_t_impl       : public false_type {};
@@ -735,34 +827,20 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_null_pointer_v
 
 // is_integral
 
-template <class _Tp> struct __libcpp_is_integral                     : public false_type {};
-template <>          struct __libcpp_is_integral<bool>               : public true_type {};
-template <>          struct __libcpp_is_integral<char>               : public true_type {};
-template <>          struct __libcpp_is_integral<signed char>        : public true_type {};
-template <>          struct __libcpp_is_integral<unsigned char>      : public true_type {};
-template <>          struct __libcpp_is_integral<wchar_t>            : public true_type {};
-#ifndef _LIBCPP_NO_HAS_CHAR8_T
-template <>          struct __libcpp_is_integral<char8_t>            : public true_type {};
-#endif
-#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
-template <>          struct __libcpp_is_integral<char16_t>           : public true_type {};
-template <>          struct __libcpp_is_integral<char32_t>           : public true_type {};
-#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
-template <>          struct __libcpp_is_integral<short>              : public true_type {};
-template <>          struct __libcpp_is_integral<unsigned short>     : public true_type {};
-template <>          struct __libcpp_is_integral<int>                : public true_type {};
-template <>          struct __libcpp_is_integral<unsigned int>       : public true_type {};
-template <>          struct __libcpp_is_integral<long>               : public true_type {};
-template <>          struct __libcpp_is_integral<unsigned long>      : public true_type {};
-template <>          struct __libcpp_is_integral<long long>          : public true_type {};
-template <>          struct __libcpp_is_integral<unsigned long long> : public true_type {};
-#ifndef _LIBCPP_HAS_NO_INT128
-template <>          struct __libcpp_is_integral<__int128_t>         : public true_type {};
-template <>          struct __libcpp_is_integral<__uint128_t>        : public true_type {};
+#if __has_keyword(__is_integral)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_integral : _BoolConstant<__is_integral(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v = __is_integral(_Tp);
 #endif
 
+#else
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral
-    : public __libcpp_is_integral<typename remove_cv<_Tp>::type> {};
+    : public _BoolConstant<__libcpp_is_integral<typename remove_cv<_Tp>::type>::value> {};
 
 #if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
 template <class _Tp>
@@ -770,6 +848,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v
     = is_integral<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_integral)
+
 // is_floating_point
 
 template <class _Tp> struct __libcpp_is_floating_point              : public false_type {};
@@ -788,6 +868,18 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_floating_point_v
 
 // is_array
 
+#if __has_keyword(__is_array)
+
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v = __is_array(_Tp);
+#endif
+
+#else
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array
     : public false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]>
@@ -801,8 +893,23 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v
     = is_array<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_array)
+
 // is_pointer
 
+// In clang 10.0.0 and earlier __is_pointer didn't work with Objective-C types.
+#if __has_keyword(__is_pointer) && _LIBCPP_CLANG_VER > 1000
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v = __is_pointer(_Tp);
+#endif
+
+#else // __has_keyword(__is_pointer)
+
 template <class _Tp> struct __libcpp_is_pointer       : public false_type {};
 template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {};
 
@@ -823,8 +930,36 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v
     = is_pointer<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_pointer)
+
 // is_reference
 
+#if __has_keyword(__is_lvalue_reference) && \
+    __has_keyword(__is_rvalue_reference) && \
+    __has_keyword(__is_reference)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> { };
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : _BoolConstant<__is_rvalue_reference(_Tp)> { };
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v = __is_reference(_Tp);
+
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v = __is_lvalue_reference(_Tp);
+
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v = __is_rvalue_reference(_Tp);
+#endif
+
+#else // __has_keyword(__is_lvalue_reference) && etc...
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference       : public false_type {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {};
 
@@ -848,6 +983,9 @@ template <class _Tp>
 _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v
     = is_rvalue_reference<_Tp>::value;
 #endif
+
+#endif // __has_keyword(__is_lvalue_reference) && etc...
+
 // is_union
 
 #if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC)
@@ -928,6 +1066,19 @@ template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> {
   };
 };
 
+#if __has_keyword(__is_member_function_pointer)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer
+    : _BoolConstant<__is_member_function_pointer(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v
+    = __is_member_function_pointer(_Tp);
+#endif
+
+#else // __has_keyword(__is_member_function_pointer)
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer
     : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {};
@@ -938,8 +1089,22 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v
     = is_member_function_pointer<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_member_function_pointer)
+
 // is_member_pointer
 
+#if __has_keyword(__is_member_pointer)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v = __is_member_pointer(_Tp);
+#endif
+
+#else // __has_keyword(__is_member_pointer)
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer
  : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {};
 
@@ -949,8 +1114,24 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v
     = is_member_pointer<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_member_pointer)
+
 // is_member_object_pointer
 
+#if __has_keyword(__is_member_object_pointer)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer
+    : _BoolConstant<__is_member_object_pointer(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v
+    = __is_member_object_pointer(_Tp);
+#endif
+
+#else // __has_keyword(__is_member_object_pointer)
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer
     : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj >  {};
 
@@ -960,6 +1141,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v
     = is_member_object_pointer<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_member_object_pointer)
+
 // is_enum
 
 #if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC)
@@ -967,6 +1150,11 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum
     : public integral_constant<bool, __is_enum(_Tp)> {};
 
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v = __is_enum(_Tp);
+#endif
+
 #else
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum
@@ -981,16 +1169,17 @@ template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum
                                      !is_class<_Tp>::value            &&
                                      !is_function<_Tp>::value         > {};
 
-#endif
-
 #if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
 template <class _Tp>
 _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v
     = is_enum<_Tp>::value;
 #endif
 
+#endif // __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC)
+
 // is_arithmetic
 
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic
     : public integral_constant<bool, is_integral<_Tp>::value      ||
                                      is_floating_point<_Tp>::value> {};
@@ -1003,6 +1192,20 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_arithmetic_v
 
 // is_fundamental
 
+// In clang 9 and lower, this builtin did not work for nullptr_t. Additionally, in C++03 mode,
+// nullptr isn't defined by the compiler so, this builtin won't work.
+#if __has_keyword(__is_fundamental) && _LIBCPP_CLANG_VER > 900 && !defined(_LIBCPP_CXX03_LANG)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v = __is_fundamental(_Tp);
+#endif
+
+#else // __has_keyword(__is_fundamental)
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental
     : public integral_constant<bool, is_void<_Tp>::value        ||
                                      __is_nullptr_t<_Tp>::value ||
@@ -1014,13 +1217,34 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v
     = is_fundamental<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_fundamental)
+
 // is_scalar
 
+// >= 11 because in C++03 nullptr isn't actually nullptr
+#if __has_keyword(__is_scalar) && !defined(_LIBCPP_CXX03_LANG)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v = __is_scalar(_Tp);
+#endif
+
+#else // __has_keyword(__is_scalar)
+
+template <class _Tp> struct __is_block : false_type {};
+#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS)
+template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {};
+#endif
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar
     : public integral_constant<bool, is_arithmetic<_Tp>::value     ||
                                      is_member_pointer<_Tp>::value ||
                                      is_pointer<_Tp>::value        ||
                                      __is_nullptr_t<_Tp>::value    ||
+                                     __is_block<_Tp>::value        ||
                                      is_enum<_Tp>::value           > {};
 
 template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {};
@@ -1031,8 +1255,22 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v
     = is_scalar<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_scalar)
+
 // is_object
 
+#if __has_keyword(__is_object)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v = __is_object(_Tp);
+#endif
+
+#else // __has_keyword(__is_object)
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object
     : public integral_constant<bool, is_scalar<_Tp>::value ||
                                      is_array<_Tp>::value  ||
@@ -1045,8 +1283,23 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v
     = is_object<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_object)
+
 // is_compound
 
+// >= 11 because in C++03 nullptr isn't actually nullptr
+#if __has_keyword(__is_compound) && !defined(_LIBCPP_CXX03_LANG)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v = __is_compound(_Tp);
+#endif
+
+#else // __has_keyword(__is_compound)
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound
     : public integral_constant<bool, !is_fundamental<_Tp>::value> {};
 
@@ -1056,6 +1309,7 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v
     = is_compound<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_compound)
 
 // __is_referenceable  [defns.referenceable]
 
@@ -1100,6 +1354,13 @@ template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type;
 
 // remove_reference
 
+#if __has_keyword(__remove_reference)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS remove_reference { typedef __remove_reference(_Tp) type; };
+
+#else // __has_keyword(__remove_reference)
+
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference        {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&>  {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;};
@@ -1108,6 +1369,8 @@ template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typede
 template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type;
 #endif
 
+#endif // __has_keyword(__remove_reference)
+
 // add_lvalue_reference
 
 template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl            { typedef _LIBCPP_NODEBUG_TYPE _Tp  type; };
@@ -1215,6 +1478,19 @@ template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type;
 
 // is_signed
 
+// In clang 9 and earlier, this builtin did not work for floating points or enums
+#if __has_keyword(__is_signed) && _LIBCPP_CLANG_VER > 900
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v = __is_signed(_Tp);
+#endif
+
+#else // __has_keyword(__is_signed)
+
 template <class _Tp, bool = is_integral<_Tp>::value>
 struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {};
 
@@ -1234,8 +1510,22 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v
     = is_signed<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_signed)
+
 // is_unsigned
 
+#if __has_keyword(__is_unsigned)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v = __is_unsigned(_Tp);
+#endif
+
+#else // __has_keyword(__is_unsigned)
+
 template <class _Tp, bool = is_integral<_Tp>::value>
 struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {};
 
@@ -1255,6 +1545,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v
     = is_unsigned<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_unsigned)
+
 // rank
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank
@@ -1272,6 +1564,19 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t rank_v
 
 // extent
 
+#if __has_keyword(__array_extent)
+
+template<class _Tp, size_t _Dim = 0>
+struct _LIBCPP_TEMPLATE_VIS extent
+    : integral_constant<size_t, __array_extent(_Tp, _Dim)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp, unsigned _Ip = 0>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v = __array_extent(_Tp, _Ip);
+#endif
+
+#else // __has_keyword(__array_extent)
+
 template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent
     : public integral_constant<size_t, 0> {};
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0>
@@ -1289,6 +1594,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v
     = extent<_Tp, _Ip>::value;
 #endif
 
+#endif // __has_keyword(__array_extent)
+
 // remove_extent
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent
@@ -2041,9 +2348,33 @@ struct _LIBCPP_TEMPLATE_VIS make_unsigned
 template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type;
 #endif
 
+#if _LIBCPP_STD_VER > 14
+template <class...> using void_t = void;
+#endif
+
+#if _LIBCPP_STD_VER > 17
+// Let COND_RES(X, Y) be:
+template <class _Tp, class _Up>
+using __cond_type = decltype(false ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>());
+
+template <class _Tp, class _Up, class = void>
+struct __common_type3 {};
+
+// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..."
+template <class _Tp, class _Up>
+struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>>
+{
+    using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>;
+};
+
+template <class _Tp, class _Up, class = void>
+struct __common_type2_imp : __common_type3<_Tp, _Up> {};
+#else
 template <class _Tp, class _Up, class = void>
 struct __common_type2_imp {};
+#endif
 
+// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..."
 template <class _Tp, class _Up>
 struct __common_type2_imp<_Tp, _Up,
                           typename __void_t<decltype(
@@ -2107,6 +2438,7 @@ struct _LIBCPP_TEMPLATE_VIS common_type<_Tp>
 
 // bullet 3 - sizeof...(Tp) == 2
 
+// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..."
 template <class _Tp, class _Up>
 struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up>
     : conditional<
@@ -2134,6 +2466,18 @@ template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type
 
 template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG_TYPE _Tp type; };
 
+#if __has_keyword(__is_assignable)
+
+template<class _Tp, class _Up>
+struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp, class _Arg>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v = __is_assignable(_Tp, _Arg);
+#endif
+
+#else // __has_keyword(__is_assignable)
+
 template <class _Tp, class _Arg>
 typename __select_2nd<decltype((_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>())), true_type>::type
 __is_assignable_test(int);
@@ -2162,6 +2506,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v
     = is_assignable<_Tp, _Arg>::value;
 #endif
 
+#endif  // __has_keyword(__is_assignable)
+
 // is_copy_assignable
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable
@@ -2188,6 +2534,18 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_assignable_v
 
 // is_destructible
 
+#if __has_keyword(__is_destructible)
+
+template<class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { };
+
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _Tp>
+_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v = __is_destructible(_Tp);
+#endif
+
+#else // __has_keyword(__is_destructible)
+
 //  if it's a reference, return true
 //  if it's a function, return false
 //  if it's   void,     return false
@@ -2250,6 +2608,8 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v
     = is_destructible<_Tp>::value;
 #endif
 
+#endif // __has_keyword(__is_destructible)
+
 // move
 
 template <class _Tp>
@@ -3879,7 +4239,6 @@ struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {};
 template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type;
 #endif
 
-
 template <class _Tp, bool = is_enum<_Tp>::value>
 struct __sfinae_underlying_type
 {
@@ -3962,8 +4321,6 @@ struct __has_operator_addressof
 
 #if _LIBCPP_STD_VER > 14
 
-template <class...> using void_t = void;
-
 template <class... _Args>
 struct conjunction : _And<_Args...> {};
 template<class... _Args>
@@ -4040,29 +4397,7 @@ _LIBCPP_END_NAMESPACE_STD
 // std::byte
 namespace std  // purposefully not versioned
 {
-template <class _Integer>
-  constexpr typename enable_if<is_integral_v<_Integer>, byte>::type &
-  operator<<=(byte& __lhs, _Integer __shift) noexcept
-  { return __lhs = __lhs << __shift; }
-
-template <class _Integer>
-  constexpr typename enable_if<is_integral_v<_Integer>, byte>::type
-  operator<< (byte  __lhs, _Integer __shift) noexcept
-  { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); }
-
-template <class _Integer>
-  constexpr typename enable_if<is_integral_v<_Integer>, byte>::type &
-  operator>>=(byte& __lhs, _Integer __shift) noexcept
-  { return __lhs = __lhs >> __shift; }
-
-template <class _Integer>
-  constexpr typename enable_if<is_integral_v<_Integer>, byte>::type
-  operator>> (byte  __lhs, _Integer __shift) noexcept
-  { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); }
-
-template <class _Integer>
-  constexpr typename enable_if<is_integral_v<_Integer>, _Integer>::type
-  to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); }
+
 
 }
 #endif
diff --git a/gnu/llvm/libcxx/include/typeinfo b/gnu/llvm/libcxx/include/typeinfo
index 27601769a83..7e76da53879 100644
--- a/gnu/llvm/libcxx/include/typeinfo
+++ b/gnu/llvm/libcxx/include/typeinfo
@@ -60,6 +60,7 @@ public:
 #include <exception>
 #include <cstddef>
 #include <cstdint>
+#include <type_traits>
 #ifdef _LIBCPP_NO_EXCEPTIONS
 #include <cstdlib>
 #endif
@@ -120,6 +121,7 @@ public:
 // ========================================================================== //
 // ------------------------------------------------------------------------- //
 //                               Unique
+//               (_LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION = 1)
 // ------------------------------------------------------------------------- //
 // This implementation of type_info assumes a unique copy of the RTTI for a
 // given type inside a program. This is a valid assumption when abiding to
@@ -129,6 +131,7 @@ public:
 // a deep string comparison.
 // -------------------------------------------------------------------------- //
 //                             NonUnique
+//               (_LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION = 2)
 // -------------------------------------------------------------------------- //
 // This implementation of type_info does not assume there is always a unique
 // copy of the RTTI for a given type inside a program. For various reasons
@@ -138,6 +141,7 @@ public:
 // comparison is equal.
 // -------------------------------------------------------------------------- //
 //                          NonUniqueARMRTTIBit
+// (selected on ARM64 regardless of _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION)
 // -------------------------------------------------------------------------- //
 // This implementation of type_info does not assume always a unique copy of
 // the RTTI for a given type inside a program. It packs the pointer to the
@@ -255,12 +259,12 @@ struct __type_info_implementations {
   typedef
 #if defined(__APPLE__) && defined(__LP64__) && !defined(__x86_64__)
     __non_unique_arm_rtti_bit_impl
-#elif _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT == 0
-    __non_unique_impl
-#elif _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT == 1
+#elif _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION == 1
     __unique_impl
+#elif _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION == 2
+    __non_unique_impl
 #else
-#   error invalid configuration for _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT
+#   error invalid configuration for _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION
 #endif
      __impl;
 };
@@ -318,6 +322,7 @@ class _LIBCPP_EXCEPTION_ABI bad_cast
 {
  public:
   bad_cast() _NOEXCEPT;
+  bad_cast(const bad_cast&) _NOEXCEPT = default;
   virtual ~bad_cast() _NOEXCEPT;
   virtual const char* what() const _NOEXCEPT;
 };
diff --git a/gnu/llvm/libcxx/include/unordered_map b/gnu/llvm/libcxx/include/unordered_map
index ad17f776c93..6156cfddd7b 100644
--- a/gnu/llvm/libcxx/include/unordered_map
+++ b/gnu/llvm/libcxx/include/unordered_map
@@ -386,10 +386,12 @@ template <class Key, class T, class Hash, class Pred, class Alloc>
               noexcept(noexcept(x.swap(y)));
 
 template <class K, class T, class H, class P, class A, class Predicate>
-    void erase_if(unordered_set<K, T, H, P, A>& c, Predicate pred);       // C++20
+    typename unordered_map<K, T, H, P, A>::size_type
+    erase_if(unordered_map<K, T, H, P, A>& c, Predicate pred);       // C++20
 
 template <class K, class T, class H, class P, class A, class Predicate>
-    void erase_if(unordered_multiset<K, T, H, P, A>& c, Predicate pred);  // C++20
+    typename unordered_multimap<K, T, H, P, A>::size_type
+    erase_if(unordered_multimap<K, T, H, P, A>& c, Predicate pred);  // C++20
 
 template <class Key, class T, class Hash, class Pred, class Alloc>
     bool
@@ -1704,10 +1706,14 @@ swap(unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 }
 
 #if _LIBCPP_STD_VER > 17
-template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc, class _Predicate>
+template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc,
+          class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::size_type
+    erase_if(unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __c,
+             _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
@@ -2402,10 +2408,14 @@ swap(unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 }
 
 #if _LIBCPP_STD_VER > 17
-template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc, class _Predicate>
+template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc,
+          class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::size_type
+    erase_if(unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __c,
+             _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
diff --git a/gnu/llvm/libcxx/include/unordered_set b/gnu/llvm/libcxx/include/unordered_set
index 68f777a4ea3..6c4ad938006 100644
--- a/gnu/llvm/libcxx/include/unordered_set
+++ b/gnu/llvm/libcxx/include/unordered_set
@@ -341,10 +341,12 @@ template <class Value, class Hash, class Pred, class Alloc>
               noexcept(noexcept(x.swap(y)));
 
 template <class K, class T, class H, class P, class A, class Predicate>
-    void erase_if(unordered_set<K, T, H, P, A>& c, Predicate pred);       // C++20
+    typename unordered_set<K, T, H, P, A>::size_type
+    erase_if(unordered_set<K, T, H, P, A>& c, Predicate pred);       // C++20
 
 template <class K, class T, class H, class P, class A, class Predicate>
-    void erase_if(unordered_multiset<K, T, H, P, A>& c, Predicate pred);  // C++20
+    typename unordered_multiset<K, T, H, P, A>::size_type
+    erase_if(unordered_multiset<K, T, H, P, A>& c, Predicate pred);  // C++20
 
 
 template <class Value, class Hash, class Pred, class Alloc>
@@ -1006,10 +1008,14 @@ swap(unordered_set<_Value, _Hash, _Pred, _Alloc>& __x,
 }
 
 #if _LIBCPP_STD_VER > 17
-template <class _Value, class _Hash, class _Pred, class _Alloc, class _Predicate>
+template <class _Value, class _Hash, class _Pred, class _Alloc,
+          class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(unordered_set<_Value, _Hash, _Pred, _Alloc>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename unordered_set<_Value, _Hash, _Pred, _Alloc>::size_type
+    erase_if(unordered_set<_Value, _Hash, _Pred, _Alloc>& __c,
+             _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 template <class _Value, class _Hash, class _Pred, class _Alloc>
@@ -1637,10 +1643,14 @@ swap(unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __x,
 }
 
 #if _LIBCPP_STD_VER > 17
-template <class _Value, class _Hash, class _Pred, class _Alloc, class _Predicate>
+template <class _Value, class _Hash, class _Pred, class _Alloc,
+          class _Predicate>
 inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __c, _Predicate __pred)
-{ __libcpp_erase_if_container(__c, __pred); }
+    typename unordered_multiset<_Value, _Hash, _Pred, _Alloc>::size_type
+    erase_if(unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __c,
+             _Predicate __pred) {
+  return __libcpp_erase_if_container(__c, __pred);
+}
 #endif
 
 template <class _Value, class _Hash, class _Pred, class _Alloc>
diff --git a/gnu/llvm/libcxx/include/variant b/gnu/llvm/libcxx/include/variant
index 98a62c992fa..03557239a69 100644
--- a/gnu/llvm/libcxx/include/variant
+++ b/gnu/llvm/libcxx/include/variant
@@ -1063,18 +1063,24 @@ public:
       }
       __impl __tmp(_VSTD::move(*__rhs));
 #ifndef _LIBCPP_NO_EXCEPTIONS
-      // EXTENSION: When the move construction of `__lhs` into `__rhs` throws
-      // and `__tmp` is nothrow move constructible then we move `__tmp` back
-      // into `__rhs` and provide the strong exception safety guarantee.
-      try {
+      if constexpr (__all<is_nothrow_move_constructible_v<_Types>...>::value) {
         this->__generic_construct(*__rhs, _VSTD::move(*__lhs));
-      } catch (...) {
-        if (__tmp.__move_nothrow()) {
-          this->__generic_construct(*__rhs, _VSTD::move(__tmp));
+      } else {
+        // EXTENSION: When the move construction of `__lhs` into `__rhs` throws
+        // and `__tmp` is nothrow move constructible then we move `__tmp` back
+        // into `__rhs` and provide the strong exception safety guarantee.
+        try {
+          this->__generic_construct(*__rhs, _VSTD::move(*__lhs));
+        } catch (...) {
+          if (__tmp.__move_nothrow()) {
+            this->__generic_construct(*__rhs, _VSTD::move(__tmp));
+          }
+          throw;
         }
-        throw;
       }
 #else
+      // this isn't consolidated with the `if constexpr` branch above due to
+      // `throw` being ill-formed with exceptions disabled even when discarded.
       this->__generic_construct(*__rhs, _VSTD::move(*__lhs));
 #endif
       this->__generic_construct(*__lhs, _VSTD::move(__tmp));
diff --git a/gnu/llvm/libcxx/include/vector b/gnu/llvm/libcxx/include/vector
index 8366bb5d11e..1007beeaafd 100644
--- a/gnu/llvm/libcxx/include/vector
+++ b/gnu/llvm/libcxx/include/vector
@@ -261,9 +261,11 @@ void swap(vector<T,Allocator>& x, vector<T,Allocator>& y)
     noexcept(noexcept(x.swap(y)));
 
 template <class T, class Allocator, class U>
-    void erase(vector<T, Allocator>& c, const U& value);       // C++20
+typename vector<T, Allocator>::size_type
+erase(vector<T, Allocator>& c, const U& value);       // C++20
 template <class T, class Allocator, class Predicate>
-    void erase_if(vector<T, Allocator>& c, Predicate pred);    // C++20
+typename vector<T, Allocator>::size_type
+erase_if(vector<T, Allocator>& c, Predicate pred);    // C++20
 
 }  // std
 
@@ -1041,8 +1043,9 @@ void
 vector<_Tp, _Allocator>::__construct_at_end(size_type __n)
 {
     _ConstructTransaction __tx(*this, __n);
-    for (; __tx.__pos_ != __tx.__new_end_; ++__tx.__pos_) {
-      __alloc_traits::construct(this->__alloc(), _VSTD::__to_address(__tx.__pos_));
+    const_pointer __new_end = __tx.__new_end_;
+    for (pointer __pos = __tx.__pos_; __pos != __new_end; ++__pos, __tx.__pos_ = __pos) {
+        __alloc_traits::construct(this->__alloc(), _VSTD::__to_address(__pos));
     }
 }
 
@@ -1058,8 +1061,9 @@ void
 vector<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x)
 {
     _ConstructTransaction __tx(*this, __n);
-    for (; __tx.__pos_ != __tx.__new_end_; ++__tx.__pos_) {
-        __alloc_traits::construct(this->__alloc(), _VSTD::__to_address(__tx.__pos_), __x);
+    const_pointer __new_end = __tx.__new_end_;
+    for (pointer __pos = __tx.__pos_; __pos != __new_end; ++__pos, __tx.__pos_ = __pos) {
+        __alloc_traits::construct(this->__alloc(), _VSTD::__to_address(__pos), __x);
     }
 }
 
@@ -1751,9 +1755,10 @@ vector<_Tp, _Allocator>::__move_range(pointer __from_s, pointer __from_e, pointe
     {
       pointer __i = __from_s + __n;
       _ConstructTransaction __tx(*this, __from_e - __i);
-      for (; __i < __from_e; ++__i, ++__tx.__pos_) {
+      for (pointer __pos = __tx.__pos_; __i < __from_e;
+           ++__i, ++__pos, __tx.__pos_ = __pos) {
           __alloc_traits::construct(this->__alloc(),
-                                    _VSTD::__to_address(__tx.__pos_),
+                                    _VSTD::__to_address(__pos),
                                     _VSTD::move(*__i));
       }
     }
@@ -1956,8 +1961,8 @@ vector<_Tp, _Allocator>::insert(const_iterator __position, _InputIterator __firs
 #endif  // _LIBCPP_NO_EXCEPTIONS
     }
     __p = _VSTD::rotate(__p, __old_last, this->__end_);
-    insert(__make_iter(__p), make_move_iterator(__v.begin()),
-                                    make_move_iterator(__v.end()));
+    insert(__make_iter(__p), _VSTD::make_move_iterator(__v.begin()),
+                             _VSTD::make_move_iterator(__v.end()));
     return begin() + __off;
 }
 
@@ -3389,14 +3394,20 @@ swap(vector<_Tp, _Allocator>& __x, vector<_Tp, _Allocator>& __y)
 
 #if _LIBCPP_STD_VER > 17
 template <class _Tp, class _Allocator, class _Up>
-inline _LIBCPP_INLINE_VISIBILITY
-void erase(vector<_Tp, _Allocator>& __c, const _Up& __v)
-{ __c.erase(_VSTD::remove(__c.begin(), __c.end(), __v), __c.end()); }
+inline _LIBCPP_INLINE_VISIBILITY typename vector<_Tp, _Allocator>::size_type
+erase(vector<_Tp, _Allocator>& __c, const _Up& __v) {
+  auto __old_size = __c.size();
+  __c.erase(_VSTD::remove(__c.begin(), __c.end(), __v), __c.end());
+  return __old_size - __c.size();
+}
 
 template <class _Tp, class _Allocator, class _Predicate>
-inline _LIBCPP_INLINE_VISIBILITY
-void erase_if(vector<_Tp, _Allocator>& __c, _Predicate __pred)
-{ __c.erase(_VSTD::remove_if(__c.begin(), __c.end(), __pred), __c.end()); }
+inline _LIBCPP_INLINE_VISIBILITY typename vector<_Tp, _Allocator>::size_type
+erase_if(vector<_Tp, _Allocator>& __c, _Predicate __pred) {
+  auto __old_size = __c.size();
+  __c.erase(_VSTD::remove_if(__c.begin(), __c.end(), __pred), __c.end());
+  return __old_size - __c.size();
+}
 #endif
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/include/version b/gnu/llvm/libcxx/include/version
index 2abc71e0f38..acedd03073c 100644
--- a/gnu/llvm/libcxx/include/version
+++ b/gnu/llvm/libcxx/include/version
@@ -21,7 +21,8 @@ __cpp_lib_allocator_traits_is_always_equal              201411L <memory> <scoped
                                                                 <unordered_map> <unordered_set>
 __cpp_lib_any                                           201606L <any>
 __cpp_lib_apply                                         201603L <tuple>
-__cpp_lib_array_constexpr                               201603L <iterator> <array>
+__cpp_lib_array_constexpr                               201811L <iterator> <array>
+                                                        201603L // C++17
 __cpp_lib_as_const                                      201510L <utility>
 __cpp_lib_atomic_is_always_lock_free                    201603L <atomic>
 __cpp_lib_atomic_ref                                    201806L <atomic>
@@ -44,7 +45,7 @@ __cpp_lib_constexpr_swap_algorithms                     201806L <algorithm>
 __cpp_lib_destroying_delete                             201806L <new>
 __cpp_lib_enable_shared_from_this                       201603L <memory>
 __cpp_lib_endian                                        201907L <bit>
-__cpp_lib_erase_if                                      201811L <string> <deque> <forward_list>
+__cpp_lib_erase_if                                      202002L <string> <deque> <forward_list>
                                                                 <list> <vector> <map>
                                                                 <set> <unordered_map> <unordered_set>
 __cpp_lib_exchange_function                             201304L <utility>
@@ -74,6 +75,7 @@ __cpp_lib_make_from_tuple                               201606L <tuple>
 __cpp_lib_make_reverse_iterator                         201402L <iterator>
 __cpp_lib_make_unique                                   201304L <memory>
 __cpp_lib_map_try_emplace                               201411L <map>
+__cpp_lib_math_constants                                201907L <numbers>
 __cpp_lib_math_special_functions                        201603L <cmath>
 __cpp_lib_memory_resource                               201603L <memory_resource>
 __cpp_lib_node_extract                                  201606L <map> <set> <unordered_map>
@@ -98,9 +100,11 @@ __cpp_lib_shared_mutex                                  201505L <shared_mutex>
 __cpp_lib_shared_ptr_arrays                             201611L <memory>
 __cpp_lib_shared_ptr_weak_type                          201606L <memory>
 __cpp_lib_shared_timed_mutex                            201402L <shared_mutex>
+__cpp_lib_span                                          202002L <span>
 __cpp_lib_string_udls                                   201304L <string>
 __cpp_lib_string_view                                   201606L <string> <string_view>
 __cpp_lib_three_way_comparison                          201711L <compare>
+__cpp_lib_to_array                                      201907L <array>
 __cpp_lib_to_chars                                      201611L <utility>
 __cpp_lib_transformation_trait_aliases                  201304L <type_traits>
 __cpp_lib_transparent_operators                         201510L <functional>
@@ -167,7 +171,7 @@ __cpp_lib_void_t                                        201411L <type_traits>
 // # define __cpp_lib_execution                            201603L
 # define __cpp_lib_filesystem                           201703L
 # define __cpp_lib_gcd_lcm                              201606L
-# define __cpp_lib_hardware_interference_size           201703L
+// # define __cpp_lib_hardware_interference_size           201703L
 # if defined(_LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS)
 #   define __cpp_lib_has_unique_object_representations  201606L
 # endif
@@ -210,6 +214,8 @@ __cpp_lib_void_t                                        201411L <type_traits>
 #endif
 
 #if _LIBCPP_STD_VER > 17
+# undef  __cpp_lib_array_constexpr
+# define __cpp_lib_array_constexpr                      201811L
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 // #   define __cpp_lib_atomic_ref                         201806L
 # endif
@@ -225,15 +231,20 @@ __cpp_lib_void_t                                        201411L <type_traits>
 #   define __cpp_lib_destroying_delete                  201806L
 # endif
 # define __cpp_lib_endian                               201907L
-# define __cpp_lib_erase_if                             201811L
+# define __cpp_lib_erase_if                             202002L
 // # define __cpp_lib_generic_unordered_lookup             201811L
 # define __cpp_lib_interpolate                          201902L
 # if !defined(_LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED)
 #   define __cpp_lib_is_constant_evaluated              201811L
 # endif
-// # define __cpp_lib_list_remove_return_type              201806L
+# define __cpp_lib_list_remove_return_type              201806L
+# if defined(__cpp_concepts) && __cpp_concepts >= 201811L
+#   define __cpp_lib_math_constants                     201907L
+# endif
 // # define __cpp_lib_ranges                               201811L
+# define __cpp_lib_span                                 202002L
 // # define __cpp_lib_three_way_comparison                 201711L
+# define __cpp_lib_to_array                             201907L
 #endif
 
 #endif // _LIBCPP_VERSIONH
diff --git a/gnu/llvm/libcxx/include/wchar.h b/gnu/llvm/libcxx/include/wchar.h
index 353c979d207..b21a78968e2 100644
--- a/gnu/llvm/libcxx/include/wchar.h
+++ b/gnu/llvm/libcxx/include/wchar.h
@@ -106,6 +106,7 @@ size_t wcsrtombs(char* restrict dst, const wchar_t** restrict src, size_t len,
 */
 
 #include <__config>
+#include <stddef.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
diff --git a/gnu/llvm/libcxx/lib/abi/9.0/x86_64-apple-darwin.v1.abilist b/gnu/llvm/libcxx/lib/abi/9.0/x86_64-apple-darwin.v1.abilist
new file mode 100644
index 00000000000..2e405c9657e
--- /dev/null
+++ b/gnu/llvm/libcxx/lib/abi/9.0/x86_64-apple-darwin.v1.abilist
@@ -0,0 +1,2422 @@
+{'is_defined': False, 'name': '__ZNKSt10bad_typeid4whatEv', 'type': 'U'}
+{'is_defined': True, 'name': '__ZNKSt10bad_typeid4whatEv', 'type': 'I'}
+{'is_defined': False, 'name': '__ZNKSt11logic_error4whatEv', 'type': 'U'}
+{'is_defined': True, 'name': '__ZNKSt11logic_error4whatEv', 'type': 'I'}
+{'is_defined': True, 'name': '__ZNKSt12bad_any_cast4whatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt12experimental15fundamentals_v112bad_any_cast4whatEv', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__ZNKSt13bad_exception4whatEv', 'type': 'U'}
+{'is_defined': True, 'name': '__ZNKSt13bad_exception4whatEv', 'type': 'I'}
+{'is_defined': False, 'name': '__ZNKSt13runtime_error4whatEv', 'type': 'U'}
+{'is_defined': True, 'name': '__ZNKSt13runtime_error4whatEv', 'type': 'I'}
+{'is_defined': True, 'name': '__ZNKSt16nested_exception14rethrow_nestedEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt18bad_variant_access4whatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt19bad_optional_access4whatEv', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__ZNKSt20bad_array_new_length4whatEv', 'type': 'U'}
+{'is_defined': True, 'name': '__ZNKSt20bad_array_new_length4whatEv', 'type': 'I'}
+{'is_defined': True, 'name': '__ZNKSt3__110__time_put8__do_putEPcRS1_PK2tmcc', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110__time_put8__do_putEPwRS1_PK2tmcc', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110error_code7messageEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE11do_groupingEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE13do_neg_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE13do_pos_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE14do_curr_symbolEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE14do_frac_digitsEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_decimal_pointEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_negative_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_positive_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_thousands_sepEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE11do_groupingEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE13do_neg_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE13do_pos_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE14do_curr_symbolEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE14do_frac_digitsEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_decimal_pointEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_negative_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_positive_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_thousands_sepEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE11do_groupingEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE13do_neg_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE13do_pos_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE14do_curr_symbolEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE14do_frac_digitsEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_decimal_pointEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_negative_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_positive_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_thousands_sepEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE11do_groupingEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE13do_neg_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE13do_pos_formatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE14do_curr_symbolEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE14do_frac_digitsEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_decimal_pointEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_negative_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_positive_signEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_thousands_sepEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db15__decrementableEPKv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db15__find_c_from_iEPv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db15__subscriptableEPKvl', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db17__dereferenceableEPKv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db17__find_c_and_lockEPv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db22__less_than_comparableEPKvS2_', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db6unlockEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db8__find_cEPv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db9__addableEPKvl', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112bad_weak_ptr4whatEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE12find_last_ofEPKcmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE13find_first_ofEPKcmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE16find_last_not_ofEPKcmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE17find_first_not_ofEPKcmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE2atEm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4copyEPcmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4findEPKcmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4findEcm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE5rfindEPKcmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE5rfindEcm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEPKc', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmPKc', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmPKcm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmRKS5_mm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE12find_last_ofEPKwmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE13find_first_ofEPKwmm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE16find_last_not_ofEPKwmm', 'type': 'FUNC'}
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diff --git a/gnu/llvm/libcxx/lib/abi/9.0/x86_64-apple-darwin.v2.abilist b/gnu/llvm/libcxx/lib/abi/9.0/x86_64-apple-darwin.v2.abilist
new file mode 100644
index 00000000000..f1205a00c3c
--- /dev/null
+++ b/gnu/llvm/libcxx/lib/abi/9.0/x86_64-apple-darwin.v2.abilist
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diff --git a/gnu/llvm/libcxx/lib/abi/9.0/x86_64-unknown-linux-gnu.v1.abilist b/gnu/llvm/libcxx/lib/abi/9.0/x86_64-unknown-linux-gnu.v1.abilist
new file mode 100644
index 00000000000..8301cbfad1b
--- /dev/null
+++ b/gnu/llvm/libcxx/lib/abi/9.0/x86_64-unknown-linux-gnu.v1.abilist
@@ -0,0 +1,1919 @@
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+{'is_defined': True, 'name': '_ZTVNSt3__19money_getIcNS_19istreambuf_iteratorIcNS_11char_traitsIcEEEEEE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__19money_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEEE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__19money_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__19money_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__19strstreamE', 'size': 120, 'type': 'OBJECT'}
+{'is_defined': False, 'name': '_ZTVSt11logic_error', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVSt12bad_any_cast', 'size': 40, 'type': 'OBJECT'}
+{'is_defined': False, 'name': '_ZTVSt12length_error', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': False, 'name': '_ZTVSt12out_of_range', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': False, 'name': '_ZTVSt13runtime_error', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': False, 'name': '_ZTVSt14overflow_error', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': False, 'name': '_ZTVSt16invalid_argument', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVSt16nested_exception', 'size': 32, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVSt18bad_variant_access', 'size': 40, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVSt19bad_optional_access', 'size': 40, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZThn16_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZThn16_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZThn16_NSt3__19strstreamD0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZThn16_NSt3__19strstreamD1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__110istrstreamD0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__110istrstreamD1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__110ostrstreamD0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__110ostrstreamD1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_istreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_istreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_istreamIwNS_11char_traitsIwEEED0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_istreamIwNS_11char_traitsIwEEED1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__19strstreamD0Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZTv0_n24_NSt3__19strstreamD1Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdaPv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdaPvRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdaPvSt11align_val_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdaPvSt11align_val_tRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdaPvm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdaPvmSt11align_val_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdlPv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdlPvRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdlPvSt11align_val_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdlPvSt11align_val_tRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdlPvm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZdlPvmSt11align_val_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_Znam', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZnamRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZnamSt11align_val_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZnamSt11align_val_tRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_Znwm', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZnwmRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZnwmSt11align_val_t', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZnwmSt11align_val_tRKSt9nothrow_t', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_allocate_exception', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_begin_catch', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_current_primary_exception', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_decrement_exception_refcount', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_end_catch', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_free_exception', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_guard_abort', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_guard_acquire', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_guard_release', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_increment_exception_refcount', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_pure_virtual', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_rethrow', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_rethrow_primary_exception', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_throw', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_uncaught_exceptions', 'type': 'FUNC'}
diff --git a/gnu/llvm/libcxx/lib/abi/CHANGELOG.TXT b/gnu/llvm/libcxx/lib/abi/CHANGELOG.TXT
index daea0a1645b..0672fb3f444 100644
--- a/gnu/llvm/libcxx/lib/abi/CHANGELOG.TXT
+++ b/gnu/llvm/libcxx/lib/abi/CHANGELOG.TXT
@@ -12,6 +12,34 @@ Afterwards the ABI list should be updated to include the new changes.
 
 New entries should be added directly below the "Version" header.
 
+------------
+Version 10.0
+------------
+
+* 54fa9ecd3088 - [libc++] Implementation of C++20's P1135R6 for libcxx
+
+  libc++ now implements P1135R6 (The C++20 Synchronization Library), which
+  adds a few symbols to the dylib. This is backwards-compatible since we're
+  just adding new symbols.
+
+  x86_64-unknown-linux-gnu
+  ------------------------
+  TODO
+
+  x86_64-apple-apple-darwin
+  -------------------------
+  Symbol added: __ZNSt3__120__libcpp_atomic_waitEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEEx
+  Symbol added: __ZNSt3__120__libcpp_atomic_waitEPVKvx
+  Symbol added: __ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE
+  Symbol added: __ZNSt3__123__cxx_atomic_notify_allEPVKv
+  Symbol added: __ZNSt3__123__cxx_atomic_notify_oneEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE
+  Symbol added: __ZNSt3__123__cxx_atomic_notify_oneEPVKv
+  Symbol added: __ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE
+  Symbol added: __ZNSt3__123__libcpp_atomic_monitorEPVKv
+  Symbol added: __ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh
+  Symbol added: __ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE
+  Symbol added: __ZNSt3__134__construct_barrier_algorithm_baseERl
+
 -----------
 Version 9.0
 -----------
diff --git a/gnu/llvm/libcxx/lib/abi/CMakeLists.txt b/gnu/llvm/libcxx/lib/abi/CMakeLists.txt
index bb9217f8847..0fa3aacfb0e 100644
--- a/gnu/llvm/libcxx/lib/abi/CMakeLists.txt
+++ b/gnu/llvm/libcxx/lib/abi/CMakeLists.txt
@@ -21,7 +21,8 @@ if (EXISTS "${ABILIST_FILE}"
     AND TARGET cxx_shared
     AND ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxabi" OR
          (APPLE AND "${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "default"))
-    AND NOT LIBCXX_ABI_UNSTABLE)
+    AND NOT LIBCXX_ABI_UNSTABLE
+    AND LIBCXX_ENABLE_EXCEPTIONS)
     add_custom_target(check-cxx-abilist
             ${SYMDIFF_EXE} --only-stdlib-symbols --strict ${ABILIST_FILE}
             $<TARGET_SONAME_FILE:cxx_shared>
diff --git a/gnu/llvm/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist b/gnu/llvm/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
index 2e405c9657e..db06a4cc17c 100644
--- a/gnu/llvm/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
+++ b/gnu/llvm/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
@@ -2420,3 +2420,14 @@
 {'type': 'OBJECT', 'is_defined': True, 'name': '__ZTINSt3__14__fs10filesystem16filesystem_errorE', 'size': 0}
 {'type': 'OBJECT', 'is_defined': True, 'name': '__ZTSNSt3__14__fs10filesystem16filesystem_errorE', 'size': 0}
 {'type': 'OBJECT', 'is_defined': True, 'name': '__ZTVNSt3__14__fs10filesystem16filesystem_errorE', 'size': 0}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__120__libcpp_atomic_waitEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEEx'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__120__libcpp_atomic_waitEPVKvx'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_allEPVKv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_oneEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_oneEPVKv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNSt3__134__construct_barrier_algorithm_baseERl'}
diff --git a/gnu/llvm/libcxx/lib/abi/x86_64-unknown-linux-gnu.v1.abilist b/gnu/llvm/libcxx/lib/abi/x86_64-unknown-linux-gnu.v1.abilist
index 8301cbfad1b..e646b86c199 100644
--- a/gnu/llvm/libcxx/lib/abi/x86_64-unknown-linux-gnu.v1.abilist
+++ b/gnu/llvm/libcxx/lib/abi/x86_64-unknown-linux-gnu.v1.abilist
@@ -1917,3 +1917,14 @@
 {'is_defined': False, 'name': '__cxa_rethrow_primary_exception', 'type': 'FUNC'}
 {'is_defined': False, 'name': '__cxa_throw', 'type': 'FUNC'}
 {'is_defined': False, 'name': '__cxa_uncaught_exceptions', 'type': 'FUNC'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__132__destroy_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseE'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKv'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__123__cxx_atomic_notify_allEPVKv'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__123__cxx_atomic_notify_oneEPVKv'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__134__construct_barrier_algorithm_baseERl'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__120__libcpp_atomic_waitEPVKvi'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__120__libcpp_atomic_waitEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEEi'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__131__arrive_barrier_algorithm_baseEPNS_24__barrier_algorithm_baseEh'}
+{'is_defined': True, 'type': 'FUNC', 'name': '_ZNSt3__123__cxx_atomic_notify_oneEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE'}
diff --git a/gnu/llvm/libcxx/lib/libc++abi-exceptions.exp b/gnu/llvm/libcxx/lib/libc++abi-exceptions.exp
new file mode 100644
index 00000000000..600a65ffead
--- /dev/null
+++ b/gnu/llvm/libcxx/lib/libc++abi-exceptions.exp
@@ -0,0 +1,10 @@
+___cxa_allocate_exception
+___cxa_begin_catch
+___cxa_call_unexpected
+___cxa_current_exception_type
+___cxa_end_catch
+___cxa_free_exception
+___cxa_get_exception_ptr
+___cxa_rethrow
+___cxa_throw
+___gxx_personality_v0
diff --git a/gnu/llvm/libcxx/lib/libc++abi-exceptions.sjlj.exp b/gnu/llvm/libcxx/lib/libc++abi-exceptions.sjlj.exp
new file mode 100644
index 00000000000..10073d615c2
--- /dev/null
+++ b/gnu/llvm/libcxx/lib/libc++abi-exceptions.sjlj.exp
@@ -0,0 +1,10 @@
+___cxa_allocate_exception
+___cxa_begin_catch
+___cxa_call_unexpected
+___cxa_current_exception_type
+___cxa_end_catch
+___cxa_free_exception
+___cxa_get_exception_ptr
+___cxa_rethrow
+___cxa_throw
+___gxx_personality_sj0
diff --git a/gnu/llvm/libcxx/lib/libc++abi.v1.exp b/gnu/llvm/libcxx/lib/libc++abi.v1.exp
index 879b4dd141e..c245b17a905 100644
--- a/gnu/llvm/libcxx/lib/libc++abi.v1.exp
+++ b/gnu/llvm/libcxx/lib/libc++abi.v1.exp
@@ -1,20 +1,11 @@
-___cxa_allocate_exception
-___cxa_end_catch
 ___cxa_demangle
-___cxa_current_exception_type
-___cxa_call_unexpected
-___cxa_free_exception
-___cxa_get_exception_ptr
 ___cxa_get_globals
 ___cxa_get_globals_fast
 ___cxa_guard_abort
 ___cxa_guard_acquire
 ___cxa_guard_release
-___cxa_rethrow
 ___cxa_pure_virtual
 ___cxa_deleted_virtual
-___cxa_begin_catch
-___cxa_throw
 ___cxa_vec_cctor
 ___cxa_vec_cleanup
 ___cxa_vec_ctor
@@ -26,7 +17,6 @@ ___cxa_vec_new
 ___cxa_vec_new2
 ___cxa_vec_new3
 ___dynamic_cast
-___gxx_personality_v0
 __ZTIDi
 __ZTIDn
 __ZTIDs
diff --git a/gnu/llvm/libcxx/lib/libc++abi.v2.exp b/gnu/llvm/libcxx/lib/libc++abi.v2.exp
index dfc308f8010..6a3e6b9f022 100644
--- a/gnu/llvm/libcxx/lib/libc++abi.v2.exp
+++ b/gnu/llvm/libcxx/lib/libc++abi.v2.exp
@@ -1,20 +1,11 @@
-___cxa_allocate_exception
-___cxa_end_catch
 ___cxa_demangle
-___cxa_current_exception_type
-___cxa_call_unexpected
-___cxa_free_exception
-___cxa_get_exception_ptr
 ___cxa_get_globals
 ___cxa_get_globals_fast
 ___cxa_guard_abort
 ___cxa_guard_acquire
 ___cxa_guard_release
-___cxa_rethrow
 ___cxa_pure_virtual
 ___cxa_deleted_virtual
-___cxa_begin_catch
-___cxa_throw
 ___cxa_throw_bad_array_new_length
 ___cxa_uncaught_exceptions
 ___cxa_vec_cctor
@@ -28,7 +19,6 @@ ___cxa_vec_new
 ___cxa_vec_new2
 ___cxa_vec_new3
 ___dynamic_cast
-___gxx_personality_v0
 __ZTIDi
 __ZTIDn
 __ZTIDs
diff --git a/gnu/llvm/libcxx/src/CMakeLists.txt b/gnu/llvm/libcxx/src/CMakeLists.txt
index 120505fe18d..2001c09761d 100644
--- a/gnu/llvm/libcxx/src/CMakeLists.txt
+++ b/gnu/llvm/libcxx/src/CMakeLists.txt
@@ -4,6 +4,8 @@ set(LIBCXX_LIB_CMAKEFILES_DIR "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTOR
 set(LIBCXX_SOURCES
   algorithm.cpp
   any.cpp
+  atomic.cpp
+  barrier.cpp
   bind.cpp
   charconv.cpp
   chrono.cpp
@@ -27,6 +29,7 @@ set(LIBCXX_SOURCES
   new.cpp
   optional.cpp
   random.cpp
+  random_shuffle.cpp
   regex.cpp
   shared_mutex.cpp
   stdexcept.cpp
@@ -160,7 +163,8 @@ if (LIBCXX_ENABLE_SHARED)
   if(COMMAND llvm_setup_rpath)
     llvm_setup_rpath(cxx_shared)
   endif()
-  target_link_libraries(cxx_shared PRIVATE ${LIBCXX_LIBRARIES})
+  target_link_libraries(cxx_shared PUBLIC cxx-headers
+                                   PRIVATE ${LIBCXX_LIBRARIES})
   set_target_properties(cxx_shared
     PROPERTIES
       COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}"
@@ -203,17 +207,20 @@ if (LIBCXX_ENABLE_SHARED)
   endif()
 
   if (LIBCXX_OSX_REEXPORT_LIBCXXABI_SYMBOLS)
-    if ("${CMAKE_OSX_ARCHITECTURES}" MATCHES "^(armv6|armv7|armv7s)$")
-      set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++sjlj-abi.v${LIBCXX_LIBCPPABI_VERSION}.exp")
-    else()
-      set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi.v${LIBCXX_LIBCPPABI_VERSION}.exp")
-    endif()
     target_link_libraries(cxx_shared PRIVATE
       "-Wl,-unexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++unexp.exp"
-      "-Wl,-reexported_symbols_list,${RE_EXPORT_LIST}"
+      "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi.v${LIBCXX_LIBCPPABI_VERSION}.exp"
       "-Wl,-force_symbols_not_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/notweak.exp"
       "-Wl,-force_symbols_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/weak.exp")
 
+    if (LIBCXX_ENABLE_EXCEPTIONS)
+      if ("${CMAKE_OSX_ARCHITECTURES}" MATCHES "^(armv6|armv7|armv7s)$")
+        target_link_libraries(cxx_shared PRIVATE "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi-exceptions.sjlj.exp")
+      else()
+        target_link_libraries(cxx_shared PRIVATE "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi-exceptions.exp")
+      endif()
+    endif()
+
     if (NOT LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS)
       target_link_libraries(cxx_shared PRIVATE "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi-new-delete.exp")
     endif()
@@ -238,7 +245,8 @@ endif()
 # Build the static library.
 if (LIBCXX_ENABLE_STATIC)
   add_library(cxx_static STATIC ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
-  target_link_libraries(cxx_static PRIVATE ${LIBCXX_LIBRARIES})
+  target_link_libraries(cxx_static PUBLIC cxx-headers
+                                   PRIVATE ${LIBCXX_LIBRARIES})
   set(CMAKE_STATIC_LIBRARY_PREFIX "lib")
   set_target_properties(cxx_static
     PROPERTIES
@@ -278,7 +286,7 @@ if (LIBCXX_ENABLE_STATIC)
     endif()
     add_custom_command(TARGET cxx_static POST_BUILD
     COMMAND
-      ${PYTHON_EXECUTABLE} ${LIBCXX_SOURCE_DIR}/utils/merge_archives.py
+      ${Python3_EXECUTABLE} ${LIBCXX_SOURCE_DIR}/utils/merge_archives.py
     ARGS
       -o $<TARGET_LINKER_FILE:cxx_static>
       --ar "${CMAKE_AR}"
@@ -292,7 +300,7 @@ if (LIBCXX_ENABLE_STATIC)
 endif()
 
 # Add a meta-target for both libraries.
-add_custom_target(cxx DEPENDS cxx-headers ${LIBCXX_BUILD_TARGETS})
+add_custom_target(cxx DEPENDS ${LIBCXX_BUILD_TARGETS})
 
 if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
   set(LIBCXX_EXPERIMENTAL_SOURCES
@@ -311,11 +319,6 @@ if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
       OUTPUT_NAME   "c++experimental"
   )
   cxx_add_common_build_flags(cxx_experimental)
-  # Overwrite the previously-set Standard flag with -std=c++14 if supported
-  check_flag_supported(-std=c++14)
-  if (NOT MSVC AND LIBCXX_SUPPORTS_STD_EQ_CXX14_FLAG)
-    target_compile_options(cxx_experimental PRIVATE "-std=c++14")
-  endif()
 endif()
 
 
@@ -352,7 +355,7 @@ if (LIBCXX_INSTALL_LIBRARY)
   endif()
 
   if(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
-    install(TARGETS ${LIBCXX_INSTALL_TARGETS} ${experimental_lib}
+    install(TARGETS cxx_experimental
       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
       RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
@@ -380,10 +383,14 @@ if (NOT CMAKE_CONFIGURATION_TYPES AND (LIBCXX_INSTALL_LIBRARY OR
     if(LIBCXX_INSTALL_HEADERS)
       set(header_install_target install-cxx-headers)
     endif()
+    if (LIBCXX_ENABLE_PARALLEL_ALGORITHMS)
+      set(pstl_install_target install-pstl)
+    endif()
     add_custom_target(install-cxx
                       DEPENDS ${lib_install_target}
                               ${experimental_lib_install_target}
                               ${header_install_target}
+                              ${pstl_install_target}
                       COMMAND "${CMAKE_COMMAND}"
                       -DCMAKE_INSTALL_COMPONENT=cxx
                       -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
@@ -391,9 +398,9 @@ if (NOT CMAKE_CONFIGURATION_TYPES AND (LIBCXX_INSTALL_LIBRARY OR
                       DEPENDS ${lib_install_target}
                               ${experimental_lib_install_target}
                               ${header_install_target}
+                              ${pstl_install_target}
                       COMMAND "${CMAKE_COMMAND}"
                       -DCMAKE_INSTALL_COMPONENT=cxx
                       -DCMAKE_INSTALL_DO_STRIP=1
                       -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
-    add_custom_target(install-libcxx DEPENDS install-cxx)
 endif()
diff --git a/gnu/llvm/libcxx/src/algorithm.cpp b/gnu/llvm/libcxx/src/algorithm.cpp
index 40669fb9e75..9f11dc38b15 100644
--- a/gnu/llvm/libcxx/src/algorithm.cpp
+++ b/gnu/llvm/libcxx/src/algorithm.cpp
@@ -7,13 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "algorithm"
-#include "random"
-#ifndef _LIBCPP_HAS_NO_THREADS
-#include "mutex"
-#if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
-#pragma comment(lib, "pthread")
-#endif
-#endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -51,45 +44,4 @@ template bool __insertion_sort_incomplete<__less<long double>&, long double*>(lo
 
 template unsigned __sort5<__less<long double>&, long double*>(long double*, long double*, long double*, long double*, long double*, __less<long double>&);
 
-#ifndef _LIBCPP_HAS_NO_THREADS
-_LIBCPP_SAFE_STATIC static __libcpp_mutex_t __rs_mut = _LIBCPP_MUTEX_INITIALIZER;
-#endif
-unsigned __rs_default::__c_ = 0;
-
-__rs_default::__rs_default()
-{
-#ifndef _LIBCPP_HAS_NO_THREADS
-    __libcpp_mutex_lock(&__rs_mut);
-#endif
-    __c_ = 1;
-}
-
-__rs_default::__rs_default(const __rs_default&)
-{
-    ++__c_;
-}
-
-__rs_default::~__rs_default()
-{
-#ifndef _LIBCPP_HAS_NO_THREADS
-    if (--__c_ == 0)
-       __libcpp_mutex_unlock(&__rs_mut);
-#else
-    --__c_;
-#endif
-}
-
-__rs_default::result_type
-__rs_default::operator()()
-{
-    static mt19937 __rs_g;
-    return __rs_g();
-}
-
-__rs_default
-__rs_get()
-{
-    return __rs_default();
-}
-
 _LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/src/atomic.cpp b/gnu/llvm/libcxx/src/atomic.cpp
new file mode 100644
index 00000000000..65d4837bb4a
--- /dev/null
+++ b/gnu/llvm/libcxx/src/atomic.cpp
@@ -0,0 +1,189 @@
+//===------------------------- atomic.cpp ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+#include <climits>
+#include <atomic>
+#include <functional>
+
+#include <iostream>
+
+#ifdef __linux__
+
+#include <unistd.h>
+#include <linux/futex.h>
+#include <sys/syscall.h>
+
+#else // <- Add other operating systems here
+
+// Baseline needs no new headers
+
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifdef __linux__
+
+static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
+                                              __cxx_contention_t __val)
+{
+    static constexpr timespec __timeout = { 2, 0 };
+    syscall(SYS_futex, __ptr, FUTEX_WAIT_PRIVATE, __val, &__timeout, 0, 0);
+}
+
+static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile* __ptr,
+                                              bool __notify_one)
+{
+    syscall(SYS_futex, __ptr, FUTEX_WAKE_PRIVATE, __notify_one ? 1 : INT_MAX, 0, 0, 0);
+}
+
+#elif defined(__APPLE__) && defined(_LIBCPP_USE_ULOCK)
+
+extern "C" int __ulock_wait(uint32_t operation, void *addr, uint64_t value,
+		uint32_t timeout); /* timeout is specified in microseconds */
+extern "C" int __ulock_wake(uint32_t operation, void *addr, uint64_t wake_value);
+
+#define UL_COMPARE_AND_WAIT				1
+#define ULF_WAKE_ALL					0x00000100
+
+static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
+                                              __cxx_contention_t __val)
+{
+    __ulock_wait(UL_COMPARE_AND_WAIT,
+                 const_cast<__cxx_atomic_contention_t*>(__ptr), __val, 0);
+}
+
+static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile* __ptr,
+                                              bool __notify_one)
+{
+    __ulock_wake(UL_COMPARE_AND_WAIT | (__notify_one ? 0 : ULF_WAKE_ALL),
+                 const_cast<__cxx_atomic_contention_t*>(__ptr), 0);
+}
+
+#else // <- Add other operating systems here
+
+// Baseline is just a timed backoff
+
+static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
+                                              __cxx_contention_t __val)
+{
+    __libcpp_thread_poll_with_backoff([=]() -> bool {
+        return !__cxx_nonatomic_compare_equal(__cxx_atomic_load(__ptr, memory_order_relaxed), __val);
+    }, __libcpp_timed_backoff_policy());
+}
+
+static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile*, bool) { }
+
+#endif // __linux__
+
+static constexpr size_t __libcpp_contention_table_size = (1 << 8);  /* < there's no magic in this number */
+
+struct alignas(64) /*  aim to avoid false sharing */ __libcpp_contention_table_entry
+{
+    __cxx_atomic_contention_t __contention_state;
+    __cxx_atomic_contention_t __platform_state;
+    inline constexpr __libcpp_contention_table_entry() :
+        __contention_state(0), __platform_state(0) { }
+};
+
+static __libcpp_contention_table_entry __libcpp_contention_table[ __libcpp_contention_table_size ];
+
+static hash<void const volatile*> __libcpp_contention_hasher;
+
+static __libcpp_contention_table_entry* __libcpp_contention_state(void const volatile * p)
+{
+    return &__libcpp_contention_table[__libcpp_contention_hasher(p) & (__libcpp_contention_table_size - 1)];
+}
+
+/* Given an atomic to track contention and an atomic to actually wait on, which may be
+   the same atomic, we try to detect contention to avoid spuriously calling the platform. */
+
+static void __libcpp_contention_notify(__cxx_atomic_contention_t volatile* __contention_state,
+                                       __cxx_atomic_contention_t const volatile* __platform_state,
+                                       bool __notify_one)
+{
+    if(0 != __cxx_atomic_load(__contention_state, memory_order_seq_cst))
+        // We only call 'wake' if we consumed a contention bit here.
+        __libcpp_platform_wake_by_address(__platform_state, __notify_one);
+}
+static __cxx_contention_t __libcpp_contention_monitor_for_wait(__cxx_atomic_contention_t volatile* __contention_state,
+                                                               __cxx_atomic_contention_t const volatile* __platform_state)
+{
+    // We will monitor this value.
+    return __cxx_atomic_load(__platform_state, memory_order_acquire);
+}
+static void __libcpp_contention_wait(__cxx_atomic_contention_t volatile* __contention_state,
+                                     __cxx_atomic_contention_t const volatile* __platform_state,
+                                     __cxx_contention_t __old_value)
+{
+    __cxx_atomic_fetch_add(__contention_state, __cxx_contention_t(1), memory_order_seq_cst);
+    // We sleep as long as the monitored value hasn't changed.
+    __libcpp_platform_wait_on_address(__platform_state, __old_value);
+    __cxx_atomic_fetch_sub(__contention_state, __cxx_contention_t(1), memory_order_release);
+}
+
+/* When the incoming atomic is the wrong size for the platform wait size, need to
+   launder the value sequence through an atomic from our table. */
+
+static void __libcpp_atomic_notify(void const volatile* __location)
+{
+    auto const __entry = __libcpp_contention_state(__location);
+    // The value sequence laundering happens on the next line below.
+    __cxx_atomic_fetch_add(&__entry->__platform_state, __cxx_contention_t(1), memory_order_release);
+    __libcpp_contention_notify(&__entry->__contention_state,
+                               &__entry->__platform_state,
+                               false /* when laundering, we can't handle notify_one */);
+}
+_LIBCPP_EXPORTED_FROM_ABI
+void __cxx_atomic_notify_one(void const volatile* __location)
+    { __libcpp_atomic_notify(__location); }
+_LIBCPP_EXPORTED_FROM_ABI
+void __cxx_atomic_notify_all(void const volatile* __location)
+    { __libcpp_atomic_notify(__location); }
+_LIBCPP_EXPORTED_FROM_ABI
+__cxx_contention_t __libcpp_atomic_monitor(void const volatile* __location)
+{
+    auto const __entry = __libcpp_contention_state(__location);
+    return __libcpp_contention_monitor_for_wait(&__entry->__contention_state, &__entry->__platform_state);
+}
+_LIBCPP_EXPORTED_FROM_ABI
+void __libcpp_atomic_wait(void const volatile* __location, __cxx_contention_t __old_value)
+{
+    auto const __entry = __libcpp_contention_state(__location);
+    __libcpp_contention_wait(&__entry->__contention_state, &__entry->__platform_state, __old_value);
+}
+
+/* When the incoming atomic happens to be the platform wait size, we still need to use the
+   table for the contention detection, but we can use the atomic directly for the wait. */
+
+_LIBCPP_EXPORTED_FROM_ABI
+void __cxx_atomic_notify_one(__cxx_atomic_contention_t const volatile* __location)
+{
+    __libcpp_contention_notify(&__libcpp_contention_state(__location)->__contention_state, __location, true);
+}
+_LIBCPP_EXPORTED_FROM_ABI
+void __cxx_atomic_notify_all(__cxx_atomic_contention_t const volatile* __location)
+{
+    __libcpp_contention_notify(&__libcpp_contention_state(__location)->__contention_state, __location, false);
+}
+_LIBCPP_EXPORTED_FROM_ABI
+__cxx_contention_t __libcpp_atomic_monitor(__cxx_atomic_contention_t const volatile* __location)
+{
+    return __libcpp_contention_monitor_for_wait(&__libcpp_contention_state(__location)->__contention_state, __location);
+}
+_LIBCPP_EXPORTED_FROM_ABI
+void __libcpp_atomic_wait(__cxx_atomic_contention_t const volatile* __location, __cxx_contention_t __old_value)
+{
+    __libcpp_contention_wait(&__libcpp_contention_state(__location)->__contention_state, __location, __old_value);
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif //_LIBCPP_HAS_NO_THREADS
diff --git a/gnu/llvm/libcxx/src/barrier.cpp b/gnu/llvm/libcxx/src/barrier.cpp
new file mode 100644
index 00000000000..c5e33cbba3b
--- /dev/null
+++ b/gnu/llvm/libcxx/src/barrier.cpp
@@ -0,0 +1,103 @@
+//===------------------------- barrier.cpp ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <__config>
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+#include <barrier>
+#include <thread>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if !defined(_LIBCPP_HAS_NO_TREE_BARRIER) && (_LIBCPP_STD_VER > 11)
+
+class __barrier_algorithm_base {
+public:
+    struct alignas(64) /* naturally-align the heap state */ __state_t
+    {
+        struct {
+            __atomic_base<__barrier_phase_t> __phase = ATOMIC_VAR_INIT(0);
+        } __tickets[64];
+    };
+
+    ptrdiff_t&         __expected;
+    unique_ptr<char[]> __state_allocation;
+    __state_t*         __state;
+
+    _LIBCPP_HIDDEN
+    __barrier_algorithm_base(ptrdiff_t& __expected)
+        : __expected(__expected)
+    {
+        size_t const __count = (__expected + 1) >> 1;
+        size_t const __size = sizeof(__state_t) * __count;
+        size_t __allocation_size = __size + alignof(__state_t);
+        __state_allocation = unique_ptr<char[]>(new char[__allocation_size]);
+        void* __allocation = __state_allocation.get();
+        void* const __state_ = align(alignof(__state_t), __size, __allocation, __allocation_size);
+        __state = new (__state_) __barrier_algorithm_base::__state_t[__count];
+    }
+    _LIBCPP_HIDDEN
+    bool __arrive(__barrier_phase_t __old_phase)
+    {
+        __barrier_phase_t const __half_step = __old_phase + 1,
+                                __full_step = __old_phase + 2;
+        size_t __current_expected = __expected,
+            __current = hash<thread::id>()(this_thread::get_id()) % ((__expected + 1) >> 1);
+        for(int __round = 0;; ++__round) {
+            if(__current_expected <= 1)
+                return true;
+            size_t const __end_node = ((__current_expected + 1) >> 1),
+                         __last_node = __end_node - 1;
+            for(;;++__current) {
+                if(__current == __end_node)
+                __current = 0;
+                __barrier_phase_t expect = __old_phase;
+                if(__current == __last_node && (__current_expected & 1))
+                {
+                    if(__state[__current].__tickets[__round].__phase.compare_exchange_strong(expect, __full_step, memory_order_acq_rel))
+                        break;    // I'm 1 in 1, go to next __round
+                }
+                else if(__state[__current].__tickets[__round].__phase.compare_exchange_strong(expect, __half_step, memory_order_acq_rel))
+                {
+                    return false; // I'm 1 in 2, done with arrival
+                }
+                else if(expect == __half_step)
+                {
+                    if(__state[__current].__tickets[__round].__phase.compare_exchange_strong(expect, __full_step, memory_order_acq_rel))
+                        break;    // I'm 2 in 2, go to next __round
+                }
+            }
+            __current_expected = __last_node + 1;
+            __current >>= 1;
+        }
+    }
+};
+
+_LIBCPP_EXPORTED_FROM_ABI
+__barrier_algorithm_base * __construct_barrier_algorithm_base(ptrdiff_t& __expected)
+{
+    return new __barrier_algorithm_base(__expected);
+}
+_LIBCPP_EXPORTED_FROM_ABI
+bool __arrive_barrier_algorithm_base(__barrier_algorithm_base* __barrier,
+                                     __barrier_phase_t __old_phase)
+{
+    return __barrier->__arrive(__old_phase);
+}
+_LIBCPP_EXPORTED_FROM_ABI
+void __destroy_barrier_algorithm_base(__barrier_algorithm_base* __barrier)
+{
+    delete __barrier;
+}
+
+#endif //!defined(_LIBCPP_HAS_NO_TREE_BARRIER) && (_LIBCPP_STD_VER >= 11)
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif //_LIBCPP_HAS_NO_THREADS
diff --git a/gnu/llvm/libcxx/src/charconv.cpp b/gnu/llvm/libcxx/src/charconv.cpp
index d3035883a78..8cfe40d156b 100644
--- a/gnu/llvm/libcxx/src/charconv.cpp
+++ b/gnu/llvm/libcxx/src/charconv.cpp
@@ -32,7 +32,7 @@ static constexpr char cDigitsLut[200] = {
 
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
-append1(char* buffer, T i)
+append1(char* buffer, T i) noexcept
 {
     *buffer = '0' + static_cast<char>(i);
     return buffer + 1;
@@ -40,7 +40,7 @@ append1(char* buffer, T i)
 
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
-append2(char* buffer, T i)
+append2(char* buffer, T i) noexcept
 {
     memcpy(buffer, &cDigitsLut[(i)*2], 2);
     return buffer + 2;
@@ -48,21 +48,21 @@ append2(char* buffer, T i)
 
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
-append3(char* buffer, T i)
+append3(char* buffer, T i) noexcept
 {
     return append2(append1(buffer, (i) / 100), (i) % 100);
 }
 
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
-append4(char* buffer, T i)
+append4(char* buffer, T i) noexcept
 {
     return append2(append2(buffer, (i) / 100), (i) % 100);
 }
 
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
-append2_no_zeros(char* buffer, T v)
+append2_no_zeros(char* buffer, T v) noexcept
 {
     if (v < 10)
         return append1(buffer, v);
@@ -72,7 +72,7 @@ append2_no_zeros(char* buffer, T v)
 
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
-append4_no_zeros(char* buffer, T v)
+append4_no_zeros(char* buffer, T v) noexcept
 {
     if (v < 100)
         return append2_no_zeros(buffer, v);
@@ -84,7 +84,7 @@ append4_no_zeros(char* buffer, T v)
 
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
-append8_no_zeros(char* buffer, T v)
+append8_no_zeros(char* buffer, T v) noexcept
 {
     if (v < 10000)
     {
@@ -99,7 +99,7 @@ append8_no_zeros(char* buffer, T v)
 }
 
 char*
-__u32toa(uint32_t value, char* buffer)
+__u32toa(uint32_t value, char* buffer) _NOEXCEPT
 {
     if (value < 100000000)
     {
@@ -120,7 +120,7 @@ __u32toa(uint32_t value, char* buffer)
 }
 
 char*
-__u64toa(uint64_t value, char* buffer)
+__u64toa(uint64_t value, char* buffer) _NOEXCEPT
 {
     if (value < 100000000)
     {
diff --git a/gnu/llvm/libcxx/src/chrono.cpp b/gnu/llvm/libcxx/src/chrono.cpp
index 9d448b6a985..f0a5d50ddf7 100644
--- a/gnu/llvm/libcxx/src/chrono.cpp
+++ b/gnu/llvm/libcxx/src/chrono.cpp
@@ -9,36 +9,32 @@
 #include "chrono"
 #include "cerrno"        // errno
 #include "system_error"  // __throw_system_error
-#include <time.h>        // clock_gettime, CLOCK_MONOTONIC and CLOCK_REALTIME
+#include <time.h>        // clock_gettime and CLOCK_{MONOTONIC,REALTIME,MONOTONIC_RAW}
 #include "include/apple_availability.h"
 
-#if !defined(__APPLE__)
+#if __has_include(<unistd.h>)
+#include <unistd.h>
+#endif
+
+#if !defined(__APPLE__) && _POSIX_TIMERS > 0
 #define _LIBCPP_USE_CLOCK_GETTIME
-#endif // __APPLE__
+#endif
 
 #if defined(_LIBCPP_WIN32API)
-#define WIN32_LEAN_AND_MEAN
-#define VC_EXTRA_LEAN
-#include <windows.h>
-#if _WIN32_WINNT >= _WIN32_WINNT_WIN8
-#include <winapifamily.h>
-#endif
+#  define WIN32_LEAN_AND_MEAN
+#  define VC_EXTRA_LEAN
+#  include <windows.h>
+#  if _WIN32_WINNT >= _WIN32_WINNT_WIN8
+#    include <winapifamily.h>
+#  endif
 #else
-#if !defined(CLOCK_REALTIME) || !defined(_LIBCPP_USE_CLOCK_GETTIME)
-#include <sys/time.h>        // for gettimeofday and timeval
-#endif // !defined(CLOCK_REALTIME)
+#  if !defined(CLOCK_REALTIME)
+#    include <sys/time.h>        // for gettimeofday and timeval
+#  endif // !defined(CLOCK_REALTIME)
 #endif // defined(_LIBCPP_WIN32API)
 
-#if !defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK)
-#if __APPLE__
-#include <mach/mach_time.h>  // mach_absolute_time, mach_timebase_info_data_t
-#elif !defined(_LIBCPP_WIN32API) && !defined(CLOCK_MONOTONIC)
-#error "Monotonic clock not implemented"
-#endif
-#endif
-
 #if defined(__ELF__) && defined(_LIBCPP_LINK_RT_LIB)
-#pragma comment(lib, "rt")
+#  pragma comment(lib, "rt")
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
@@ -78,7 +74,7 @@ system_clock::now() _NOEXCEPT
                        static_cast<__int64>(ft.dwLowDateTime)};
   return time_point(duration_cast<duration>(d - nt_to_unix_epoch));
 #else
-#if defined(_LIBCPP_USE_CLOCK_GETTIME) && defined(CLOCK_REALTIME)
+#if defined(CLOCK_REALTIME)
   struct timespec tp;
   if (0 != clock_gettime(CLOCK_REALTIME, &tp))
     __throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed");
@@ -87,7 +83,7 @@ system_clock::now() _NOEXCEPT
     timeval tv;
     gettimeofday(&tv, 0);
     return time_point(seconds(tv.tv_sec) + microseconds(tv.tv_usec));
-#endif // _LIBCPP_USE_CLOCK_GETTIME && CLOCK_REALTIME
+#endif // CLOCK_REALTIME
 #endif
 }
 
@@ -114,71 +110,24 @@ const bool steady_clock::is_steady;
 
 #if defined(__APPLE__)
 
-// Darwin libc versions >= 1133 provide ns precision via CLOCK_UPTIME_RAW
-#if defined(_LIBCPP_USE_CLOCK_GETTIME) && defined(CLOCK_UPTIME_RAW)
+#if !defined(CLOCK_MONOTONIC_RAW)
+#  error "Building libc++ on Apple platforms requires CLOCK_MONOTONIC_RAW"
+#endif
+
+// On Apple platforms, only CLOCK_UPTIME_RAW, CLOCK_MONOTONIC_RAW or
+// mach_absolute_time are able to time functions in the nanosecond range.
+// Furthermore, only CLOCK_MONOTONIC_RAW is truly monotonic, because it
+// also counts cycles when the system is asleep. Thus, it is the only
+// acceptable implementation of steady_clock.
 steady_clock::time_point
 steady_clock::now() _NOEXCEPT
 {
     struct timespec tp;
-    if (0 != clock_gettime(CLOCK_UPTIME_RAW, &tp))
-        __throw_system_error(errno, "clock_gettime(CLOCK_UPTIME_RAW) failed");
+    if (0 != clock_gettime(CLOCK_MONOTONIC_RAW, &tp))
+        __throw_system_error(errno, "clock_gettime(CLOCK_MONOTONIC_RAW) failed");
     return time_point(seconds(tp.tv_sec) + nanoseconds(tp.tv_nsec));
 }
 
-#else
-//   mach_absolute_time() * MachInfo.numer / MachInfo.denom is the number of
-//   nanoseconds since the computer booted up.  MachInfo.numer and MachInfo.denom
-//   are run time constants supplied by the OS.  This clock has no relationship
-//   to the Gregorian calendar.  It's main use is as a high resolution timer.
-
-// MachInfo.numer / MachInfo.denom is often 1 on the latest equipment.  Specialize
-//   for that case as an optimization.
-
-static
-steady_clock::rep
-steady_simplified()
-{
-    return static_cast<steady_clock::rep>(mach_absolute_time());
-}
-
-static
-double
-compute_steady_factor()
-{
-    mach_timebase_info_data_t MachInfo;
-    mach_timebase_info(&MachInfo);
-    return static_cast<double>(MachInfo.numer) / MachInfo.denom;
-}
-
-static
-steady_clock::rep
-steady_full()
-{
-    static const double factor = compute_steady_factor();
-    return static_cast<steady_clock::rep>(mach_absolute_time() * factor);
-}
-
-typedef steady_clock::rep (*FP)();
-
-static
-FP
-init_steady_clock()
-{
-    mach_timebase_info_data_t MachInfo;
-    mach_timebase_info(&MachInfo);
-    if (MachInfo.numer == MachInfo.denom)
-        return &steady_simplified;
-    return &steady_full;
-}
-
-steady_clock::time_point
-steady_clock::now() _NOEXCEPT
-{
-    static FP fp = init_steady_clock();
-    return time_point(duration(fp()));
-}
-#endif // defined(_LIBCPP_USE_CLOCK_GETTIME) && defined(CLOCK_UPTIME_RAW)
-
 #elif defined(_LIBCPP_WIN32API)
 
 // https://msdn.microsoft.com/en-us/library/windows/desktop/ms644905(v=vs.85).aspx says:
@@ -206,13 +155,6 @@ steady_clock::now() _NOEXCEPT
 
 #elif defined(CLOCK_MONOTONIC)
 
-// On Apple platforms only CLOCK_UPTIME_RAW or mach_absolute_time are able to
-// time functions in the nanosecond range. Thus, they are the only acceptable
-// implementations of steady_clock.
-#ifdef __APPLE__
-#error "Never use CLOCK_MONOTONIC for steady_clock::now on Apple platforms"
-#endif
-
 steady_clock::time_point
 steady_clock::now() _NOEXCEPT
 {
@@ -223,7 +165,7 @@ steady_clock::now() _NOEXCEPT
 }
 
 #else
-#error "Monotonic clock not implemented"
+#  error "Monotonic clock not implemented"
 #endif
 
 #endif // !_LIBCPP_HAS_NO_MONOTONIC_CLOCK
diff --git a/gnu/llvm/libcxx/src/filesystem/operations.cpp b/gnu/llvm/libcxx/src/filesystem/operations.cpp
index 876399fb4d4..5c98671feee 100644
--- a/gnu/llvm/libcxx/src/filesystem/operations.cpp
+++ b/gnu/llvm/libcxx/src/filesystem/operations.cpp
@@ -36,13 +36,9 @@
 #define _LIBCPP_USE_COPYFILE
 #endif
 
-#if !defined(__APPLE__)
-#define _LIBCPP_USE_CLOCK_GETTIME
-#endif
-
-#if !defined(CLOCK_REALTIME) || !defined(_LIBCPP_USE_CLOCK_GETTIME)
+#if !defined(CLOCK_REALTIME)
 #include <sys/time.h> // for gettimeofday and timeval
-#endif                // !defined(CLOCK_REALTIME)
+#endif // !defined(CLOCK_REALTIME)
 
 #if defined(__ELF__) && defined(_LIBCPP_LINK_RT_LIB)
 #pragma comment(lib, "rt")
@@ -490,7 +486,7 @@ const bool _FilesystemClock::is_steady;
 
 _FilesystemClock::time_point _FilesystemClock::now() noexcept {
   typedef chrono::duration<rep> __secs;
-#if defined(_LIBCPP_USE_CLOCK_GETTIME) && defined(CLOCK_REALTIME)
+#if defined(CLOCK_REALTIME)
   typedef chrono::duration<rep, nano> __nsecs;
   struct timespec tp;
   if (0 != clock_gettime(CLOCK_REALTIME, &tp))
@@ -502,7 +498,7 @@ _FilesystemClock::time_point _FilesystemClock::now() noexcept {
   timeval tv;
   gettimeofday(&tv, 0);
   return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec));
-#endif // _LIBCPP_USE_CLOCK_GETTIME && CLOCK_REALTIME
+#endif // CLOCK_REALTIME
 }
 
 filesystem_error::~filesystem_error() {}
diff --git a/gnu/llvm/libcxx/src/include/apple_availability.h b/gnu/llvm/libcxx/src/include/apple_availability.h
index 0091138170f..0f999d3feaf 100644
--- a/gnu/llvm/libcxx/src/include/apple_availability.h
+++ b/gnu/llvm/libcxx/src/include/apple_availability.h
@@ -29,20 +29,20 @@
 #endif // __ENVIRONMENT_.*_VERSION_MIN_REQUIRED__
 
 #if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200
-#define _LIBCPP_USE_CLOCK_GETTIME
+#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101500
+#define _LIBCPP_USE_ULOCK
 #endif
 #elif defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ >= 100000
-#define _LIBCPP_USE_CLOCK_GETTIME
+#if __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ >= 130000
+#define _LIBCPP_USE_ULOCK
 #endif
 #elif defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ >= 100000
-#define _LIBCPP_USE_CLOCK_GETTIME
+#if __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ >= 130000
+#define _LIBCPP_USE_ULOCK
 #endif
 #elif defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__)
-#if __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 30000
-#define _LIBCPP_USE_CLOCK_GETTIME
+#if __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 60000
+#define _LIBCPP_USE_ULOCK
 #endif
 #endif // __ENVIRONMENT_.*_VERSION_MIN_REQUIRED__
 
diff --git a/gnu/llvm/libcxx/src/locale.cpp b/gnu/llvm/libcxx/src/locale.cpp
index 2757eaa5acd..b9180880e49 100644
--- a/gnu/llvm/libcxx/src/locale.cpp
+++ b/gnu/llvm/libcxx/src/locale.cpp
@@ -536,7 +536,7 @@ locale::operator=(const locale& other)  _NOEXCEPT
 
 locale::locale(const char* name)
     : __locale_(name ? new __imp(name)
-                     : (__throw_runtime_error("locale constructed with null"), (__imp*)0))
+                     : (__throw_runtime_error("locale constructed with null"), nullptr))
 {
     __locale_->__add_shared();
 }
@@ -549,7 +549,7 @@ locale::locale(const string& name)
 
 locale::locale(const locale& other, const char* name, category c)
     : __locale_(name ? new __imp(*other.__locale_, name, c)
-                     : (__throw_runtime_error("locale constructed with null"), (__imp*)0))
+                     : (__throw_runtime_error("locale constructed with null"), nullptr))
 {
     __locale_->__add_shared();
 }
diff --git a/gnu/llvm/libcxx/src/random_shuffle.cpp b/gnu/llvm/libcxx/src/random_shuffle.cpp
new file mode 100644
index 00000000000..be2c47fa0de
--- /dev/null
+++ b/gnu/llvm/libcxx/src/random_shuffle.cpp
@@ -0,0 +1,61 @@
+//===----------------------- random_shuffle.cpp ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "algorithm"
+#include "random"
+#ifndef _LIBCPP_HAS_NO_THREADS
+#   include "mutex"
+#   if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
+#       pragma comment(lib, "pthread")
+#   endif
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+_LIBCPP_SAFE_STATIC static __libcpp_mutex_t __rs_mut = _LIBCPP_MUTEX_INITIALIZER;
+#endif
+unsigned __rs_default::__c_ = 0;
+
+__rs_default::__rs_default()
+{
+#ifndef _LIBCPP_HAS_NO_THREADS
+    __libcpp_mutex_lock(&__rs_mut);
+#endif
+    __c_ = 1;
+}
+
+__rs_default::__rs_default(const __rs_default&)
+{
+    ++__c_;
+}
+
+__rs_default::~__rs_default()
+{
+#ifndef _LIBCPP_HAS_NO_THREADS
+    if (--__c_ == 0)
+       __libcpp_mutex_unlock(&__rs_mut);
+#else
+    --__c_;
+#endif
+}
+
+__rs_default::result_type
+__rs_default::operator()()
+{
+    static mt19937 __rs_g;
+    return __rs_g();
+}
+
+__rs_default
+__rs_get()
+{
+    return __rs_default();
+}
+
+_LIBCPP_END_NAMESPACE_STD
diff --git a/gnu/llvm/libcxx/src/string.cpp b/gnu/llvm/libcxx/src/string.cpp
index 4802d63c811..5105594cf38 100644
--- a/gnu/llvm/libcxx/src/string.cpp
+++ b/gnu/llvm/libcxx/src/string.cpp
@@ -20,8 +20,13 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __basic_string_common<true>;
 
-template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_string<char>;
-template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_string<wchar_t>;
+#ifdef _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
+_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, char)
+_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, wchar_t)
+#else
+_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, char)
+_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, wchar_t)
+#endif
 
 template
     string
diff --git a/gnu/llvm/libcxx/utils/ci/apple-install-libcxx.sh b/gnu/llvm/libcxx/utils/ci/apple-install-libcxx.sh
new file mode 100755
index 00000000000..7c3517d7c88
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/ci/apple-install-libcxx.sh
@@ -0,0 +1,178 @@
+#!/usr/bin/env bash
+#===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===----------------------------------------------------------------------===##
+
+set -e
+
+PROGNAME="$(basename "${0}")"
+
+function error() { printf "error: %s\n" "$*"; exit 1; }
+
+function usage() {
+cat <<EOF
+Usage:
+${PROGNAME} [options]
+
+[-h|--help]                  Display this help and exit.
+
+--llvm-root <DIR>            Full path to the root of the LLVM monorepo. Only the libcxx
+                             and libcxxabi directories are required.
+
+--build-dir <DIR>            Full path to the directory to use for building. This will
+                             contain intermediate build products.
+
+--install-dir <DIR>          Full path to the directory to install the library to.
+
+--symbols-dir <DIR>          Full path to the directory to install the .dSYM bundle to.
+
+--sdk <SDK>                  SDK used for building the library. This represents
+                             the target platform that the library will run on.
+                             You can get a list of SDKs with \`xcodebuild -showsdks\`.
+
+--architectures "<arch>..."  A whitespace separated list of architectures to build for.
+                             The library will be built for each architecture independently,
+                             and a universal binary containing all architectures will be
+                             created from that.
+
+--version X[.Y[.Z]]          The version of the library to encode in the dylib.
+
+--cache <PATH>               The CMake cache to use to control how the library gets built.
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+    case ${1} in
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        --llvm-root)
+            llvm_root="${2}"
+            shift; shift
+            ;;
+        --build-dir)
+            build_dir="${2}"
+            shift; shift
+            ;;
+        --symbols-dir)
+            symbols_dir="${2}"
+            shift; shift
+            ;;
+        --install-dir)
+            install_dir="${2}"
+            shift; shift
+            ;;
+        --sdk)
+            sdk="${2}"
+            shift; shift
+            ;;
+        --architectures)
+            architectures="${2}"
+            shift; shift
+            ;;
+        --version)
+            version="${2}"
+            shift; shift
+            ;;
+        --cache)
+            cache="${2}"
+            shift; shift
+            ;;
+        *)
+            error "Unknown argument '${1}'"
+            ;;
+    esac
+done
+
+for arg in llvm_root build_dir symbols_dir install_dir sdk architectures version cache; do
+    if [ -z ${!arg+x} ]; then
+        error "Missing required argument '--${arg//_/-}'"
+    elif [ "${!arg}" == "" ]; then
+        error "Argument to --${arg//_/-} must not be empty"
+    fi
+done
+
+function step() {
+    separator="$(printf "%0.s-" $(seq 1 ${#1}))"
+    echo
+    echo "${separator}"
+    echo "${1}"
+    echo "${separator}"
+}
+
+install_name_dir="/usr/lib"
+dylib_name="libc++.1.dylib"
+make_symlink="yes"
+headers_prefix="${install_dir}"
+
+for arch in ${architectures}; do
+    step "Building libc++.dylib and libc++abi.dylib for architecture ${arch}"
+    mkdir -p "${build_dir}/${arch}"
+    (cd "${build_dir}/${arch}" &&
+        xcrun --sdk "${sdk}" cmake "${llvm_root}/libcxx/utils/ci/runtimes" \
+            -GNinja \
+            -DCMAKE_MAKE_PROGRAM="$(xcrun --sdk "${sdk}" --find ninja)" \
+            -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi" \
+            -C "${cache}" \
+            -DCMAKE_INSTALL_PREFIX="${build_dir}/${arch}-install" \
+            -DCMAKE_INSTALL_NAME_DIR="${install_name_dir}" \
+            -DCMAKE_OSX_ARCHITECTURES="${arch}" \
+            -DLIBCXXABI_LIBRARY_VERSION="${version}" \
+            -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
+            -DLIBCXX_INCLUDE_TESTS=OFF
+    )
+
+    xcrun --sdk "${sdk}" cmake --build "${build_dir}/${arch}" --target install-cxx install-cxxabi -- -v
+done
+
+function universal_dylib() {
+    dylib=${1}
+
+    inputs=$(for arch in ${architectures}; do echo "${build_dir}/${arch}-install/lib/${dylib}"; done)
+
+    step "Creating a universal dylib ${dylib} from the dylibs for all architectures"
+    xcrun --sdk "${sdk}" lipo -create ${inputs} -output "${build_dir}/${dylib}"
+
+    step "Installing the (stripped) universal dylib to ${install_dir}/usr/lib"
+    mkdir -p "${install_dir}/usr/lib"
+    cp "${build_dir}/${dylib}" "${install_dir}/usr/lib/${dylib}"
+    xcrun --sdk "${sdk}" strip -S "${install_dir}/usr/lib/${dylib}"
+
+    step "Installing the unstripped dylib and the dSYM bundle to ${symbols_dir}"
+    xcrun --sdk "${sdk}" dsymutil "${build_dir}/${dylib}" -o "${symbols_dir}/${dylib}.dSYM"
+    cp "${build_dir}/${dylib}" "${symbols_dir}/${dylib}"
+}
+
+universal_dylib ${dylib_name}
+universal_dylib libc++abi.dylib
+
+if [[ "${make_symlink}" == "yes" ]]; then
+    (cd "${install_dir}/usr/lib" && ln -s "${dylib_name}" libc++.dylib)
+fi
+
+# Install the headers by copying the headers from one of the built architectures
+# into the install directory. Headers from all architectures should be the same.
+step "Installing the libc++ and libc++abi headers to ${headers_prefix}/usr/include"
+any_arch=$(echo ${architectures} | cut -d ' ' -f 1)
+mkdir -p "${headers_prefix}/usr/include"
+ditto "${build_dir}/${any_arch}-install/include" "${headers_prefix}/usr/include"
+ditto "${llvm_root}/libcxxabi/include" "${headers_prefix}/usr/include" # TODO: libcxxabi should install its headers in CMake
+if [[ $EUID -eq 0 ]]; then # Only chown if we're running as root
+    chown -R root:wheel "${headers_prefix}/usr/include"
+fi
+
+step "Installing the libc++ and libc++abi licenses"
+mkdir -p "${headers_prefix}/usr/local/OpenSourceLicenses"
+cp "${llvm_root}/libcxx/LICENSE.TXT" "${headers_prefix}/usr/local/OpenSourceLicenses/libcxx.txt"
+cp "${llvm_root}/libcxxabi/LICENSE.TXT" "${headers_prefix}/usr/local/OpenSourceLicenses/libcxxabi.txt"
+
+# Also install a static archive for libc++abi
+libcxxabi_archives=$(for arch in ${architectures}; do echo "${build_dir}/${arch}-install/lib/libc++abi.a"; done)
+step "Creating a universal libc++abi static archive from the static archives for each architecture"
+mkdir -p "${install_dir}/usr/local/lib/libcxx"
+xcrun --sdk "${sdk}" libtool -static ${libcxxabi_archives} -o "${install_dir}/usr/local/lib/libcxx/libc++abi-static.a"
diff --git a/gnu/llvm/libcxx/utils/ci/macos-backdeployment.sh b/gnu/llvm/libcxx/utils/ci/macos-backdeployment.sh
index 6996af93434..d86337e4db3 100755
--- a/gnu/llvm/libcxx/utils/ci/macos-backdeployment.sh
+++ b/gnu/llvm/libcxx/utils/ci/macos-backdeployment.sh
@@ -4,15 +4,16 @@ set -ue
 
 function usage() {
   cat <<EOM
-$(basename ${0}) [-h|--help] --monorepo-root <MONOREPO-ROOT> --std <STD> --arch <ARCHITECTURE> --deployment-target <TARGET> --sdk-version <SDK-VERSION> [--lit-args <ARGS...>]
+$(basename ${0}) [-h|--help] --monorepo-root <MONOREPO-ROOT> --std <STD> --deployment-target <TARGET> [--libcxx-roots <DIR>] [--lit-args <ARGS...>] [--no-cleanup]
 
 This script is used to continually test the back-deployment use case of libc++ and libc++abi on MacOS.
 
+Specifically, this script runs the libc++ test suite against the just-built headers and linking against the just-built dylib, but it runs the tests against the dylibs for the given deployment target.
+
   --monorepo-root     Full path to the root of the LLVM monorepo. Both libc++ and libc++abi headers from the monorepo are used.
   --std               Version of the C++ Standard to run the tests under (c++03, c++11, etc..).
-  --arch              Architecture to build the tests for (32, 64).
   --deployment-target The deployment target to run the tests for. This should be a version number of MacOS (e.g. 10.12). All MacOS versions until and including 10.9 are supported.
-  --sdk-version       The version of the SDK to test with. This should be a version number of MacOS (e.g. 10.12). We'll link against the libc++ dylib in that SDK, but we'll run against the one on the given deployment target.
+  [--libcxx-roots]    The path to previous libc++/libc++abi dylibs to use for back-deployment testing. Those are normally downloaded automatically, but if specified, this option will override the directory used. The directory should have the same layout as the roots downloaded automatically.
   [--lit-args]        Additional arguments to pass to lit (optional). If there are multiple arguments, quote them to pass them as a single argument to this script.
   [--no-cleanup]      Do not cleanup the temporary directory that was used for testing at the end. This can be useful to debug failures. Make sure to clean up manually after.
   [-h, --help]        Print this help.
@@ -34,22 +35,18 @@ while [[ $# -gt 0 ]]; do
     STD="${2}"
     shift; shift
     ;;
-    --arch)
-    ARCH="${2}"
-    shift; shift
-    ;;
     --deployment-target)
     DEPLOYMENT_TARGET="${2}"
     shift; shift
     ;;
-    --sdk-version)
-    MACOS_SDK_VERSION="${2}"
-    shift; shift
-    ;;
     --lit-args)
     ADDITIONAL_LIT_ARGS="${2}"
     shift; shift
     ;;
+    --libcxx-roots)
+    PREVIOUS_DYLIBS_DIR="${2}"
+    shift; shift
+    ;;
     --no-cleanup)
     NO_CLEANUP=""
     shift
@@ -68,11 +65,9 @@ done
 
 if [[ -z ${MONOREPO_ROOT+x} ]]; then echo "--monorepo-root is a required parameter"; usage; exit 1; fi
 if [[ -z ${STD+x} ]]; then echo "--std is a required parameter"; usage; exit 1; fi
-if [[ -z ${ARCH+x} ]]; then echo "--arch is a required parameter"; usage; exit 1; fi
 if [[ -z ${DEPLOYMENT_TARGET+x} ]]; then echo "--deployment-target is a required parameter"; usage; exit 1; fi
-if [[ -z ${MACOS_SDK_VERSION+x} ]]; then echo "--sdk-version is a required parameter"; usage; exit 1; fi
 if [[ -z ${ADDITIONAL_LIT_ARGS+x} ]]; then ADDITIONAL_LIT_ARGS=""; fi
-
+if [[ -z ${PREVIOUS_DYLIBS_DIR+x} ]]; then PREVIOUS_DYLIBS_DIR=""; fi
 
 TEMP_DIR="$(mktemp -d)"
 echo "Created temporary directory ${TEMP_DIR}"
@@ -94,12 +89,6 @@ PREVIOUS_DYLIBS_URL="http://lab.llvm.org:8080/roots/libcxx-roots.tar.gz"
 LLVM_TARBALL_URL="https://github.com/llvm-mirror/llvm/archive/master.tar.gz"
 
 
-echo "@@@ Configuring architecture-related stuff @@@"
-if [[ "${ARCH}" == "64" ]]; then CMAKE_ARCH_STRING="x86_64"; else CMAKE_ARCH_STRING="i386"; fi
-if [[ "${ARCH}" == "64" ]]; then LIT_ARCH_STRING="";         else LIT_ARCH_STRING="--param=enable_32bit=true"; fi
-echo "@@@@@@"
-
-
 echo "@@@ Configuring CMake @@@"
 mkdir -p "${LLVM_BUILD_DIR}"
 (cd "${LLVM_BUILD_DIR}" &&
@@ -108,38 +97,46 @@ mkdir -p "${LLVM_BUILD_DIR}"
     -GNinja \
     -DCMAKE_INSTALL_PREFIX="${LLVM_INSTALL_DIR}" \
     -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi" \
-    -DCMAKE_OSX_ARCHITECTURES="${CMAKE_ARCH_STRING}" \
+    -DCMAKE_OSX_ARCHITECTURES="x86_64" \
     "${MONOREPO_ROOT}/llvm"
 )
 echo "@@@@@@"
 
 
-echo "@@@ Installing the latest libc++ headers @@@"
-ninja -C "${LLVM_BUILD_DIR}" install-cxx-headers
+echo "@@@ Building and installing libc++ and libc++abi @@@"
+ninja -C "${LLVM_BUILD_DIR}" install-cxx install-cxxabi
 echo "@@@@@@"
 
 
-echo "@@@ Downloading dylibs for older deployment targets @@@"
-# TODO: We should also link against the libc++abi.dylib that was shipped in the SDK
-PREVIOUS_DYLIBS_DIR="${TEMP_DIR}/libcxx-dylibs"
-mkdir "${PREVIOUS_DYLIBS_DIR}"
-curl "${PREVIOUS_DYLIBS_URL}" | tar -xz --strip-components=1 -C "${PREVIOUS_DYLIBS_DIR}"
-LIBCXX_ON_DEPLOYMENT_TARGET="${PREVIOUS_DYLIBS_DIR}/macOS/${DEPLOYMENT_TARGET}/libc++.dylib"
-LIBCXXABI_ON_DEPLOYMENT_TARGET="${PREVIOUS_DYLIBS_DIR}/macOS/${DEPLOYMENT_TARGET}/libc++abi.dylib"
-LIBCXX_IN_SDK="${PREVIOUS_DYLIBS_DIR}/macOS/${MACOS_SDK_VERSION}/libc++.dylib"
-echo "@@@@@@"
+if [[ ${PREVIOUS_DYLIBS_DIR} == "" ]]; then
+  echo "@@@ Downloading dylibs for older deployment targets @@@"
+  PREVIOUS_DYLIBS_DIR="${TEMP_DIR}/libcxx-dylibs"
+  mkdir "${PREVIOUS_DYLIBS_DIR}"
+  curl "${PREVIOUS_DYLIBS_URL}" | tar -xz --strip-components=1 -C "${PREVIOUS_DYLIBS_DIR}"
+  echo "@@@@@@"
+fi
+
+LIBCXX_ROOT_ON_DEPLOYMENT_TARGET="${PREVIOUS_DYLIBS_DIR}/macOS/libc++/${DEPLOYMENT_TARGET}"
+LIBCXXABI_ROOT_ON_DEPLOYMENT_TARGET="${PREVIOUS_DYLIBS_DIR}/macOS/libc++abi/${DEPLOYMENT_TARGET}"
 
+# Filesystem is supported on Apple platforms starting with macosx10.15.
+if [[ ${DEPLOYMENT_TARGET} =~ ^10.9|10.10|10.11|10.12|10.13|10.14$ ]]; then
+    ENABLE_FILESYSTEM="--param enable_filesystem=false"
+else
+    ENABLE_FILESYSTEM="--param enable_filesystem=true"
+fi
 
 # TODO: We need to also run the tests for libc++abi.
 echo "@@@ Running tests for libc++ @@@"
 "${LLVM_BUILD_DIR}/bin/llvm-lit" -sv "${MONOREPO_ROOT}/libcxx/test" \
                                  --param=enable_experimental=false \
-                                 ${LIT_ARCH_STRING} \
+                                 ${ENABLE_FILESYSTEM} \
                                  --param=cxx_headers="${LLVM_INSTALL_DIR}/include/c++/v1" \
                                  --param=std="${STD}" \
                                  --param=platform="macosx${DEPLOYMENT_TARGET}" \
-                                 --param=cxx_runtime_root="$(dirname "${LIBCXX_ON_DEPLOYMENT_TARGET}")" \
-                                 --param=abi_library_path="$(dirname "${LIBCXXABI_ON_DEPLOYMENT_TARGET}")" \
-                                 --param=use_system_cxx_lib="$(dirname "${LIBCXX_IN_SDK}")" \
+                                 --param=cxx_library_root="${LLVM_INSTALL_DIR}/lib" \
+                                 --param=cxx_runtime_root="${LIBCXX_ROOT_ON_DEPLOYMENT_TARGET}" \
+                                 --param=abi_library_path="${LIBCXXABI_ROOT_ON_DEPLOYMENT_TARGET}" \
+                                 --param=use_system_cxx_lib="True" \
                                  ${ADDITIONAL_LIT_ARGS}
 echo "@@@@@@"
diff --git a/gnu/llvm/libcxx/utils/ci/macos-trunk.sh b/gnu/llvm/libcxx/utils/ci/macos-trunk.sh
index 7a5ee75e2b5..dc977db9a84 100755
--- a/gnu/llvm/libcxx/utils/ci/macos-trunk.sh
+++ b/gnu/llvm/libcxx/utils/ci/macos-trunk.sh
@@ -4,13 +4,12 @@ set -ue
 
 function usage() {
   cat <<EOM
-$(basename ${0}) [-h|--help] --monorepo-root <MONOREPO-ROOT> --std <STD> --arch <ARCHITECTURE> [--lit-args <ARGS...>]
+$(basename ${0}) [-h|--help] --monorepo-root <MONOREPO-ROOT> --std <STD> --libcxx-exceptions <ON|OFF> [--lit-args <ARGS...>]
 
 This script is used to continually test libc++ and libc++abi trunk on MacOS.
 
   --monorepo-root     Full path to the root of the LLVM monorepo. Both libc++ and libc++abi from the monorepo are used.
   --std               Version of the C++ Standard to run the tests under (c++03, c++11, etc..).
-  --arch              Architecture to build the tests for (32, 64).
   --libcxx-exceptions Whether to enable exceptions when building libc++ and running the libc++ tests. libc++abi is always built with support for exceptions because other libraries in the runtime depend on it (like libobjc). This must be ON or OFF.
   [--cmake-args]      Additional arguments to pass to CMake (both the libc++ and the libc++abi configuration). If there are multiple arguments, quote them to paass them as a single argument to this script.
   [--lit-args]        Additional arguments to pass to lit. If there are multiple arguments, quote them to pass them as a single argument to this script.
@@ -34,10 +33,6 @@ while [[ $# -gt 0 ]]; do
     STD="${2}"
     shift; shift
     ;;
-    --arch)
-    ARCH="${2}"
-    shift; shift
-    ;;
     --libcxx-exceptions)
     LIBCXX_EXCEPTIONS="${2}"
     shift; shift
@@ -68,7 +63,6 @@ done
 
 if [[ -z ${MONOREPO_ROOT+x} ]]; then echo "--monorepo-root is a required parameter"; usage; exit 1; fi
 if [[ -z ${STD+x} ]]; then echo "--std is a required parameter"; usage; exit 1; fi
-if [[ -z ${ARCH+x} ]]; then echo "--arch is a required parameter"; usage; exit 1; fi
 if [[ "${LIBCXX_EXCEPTIONS}" != "ON" && "${LIBCXX_EXCEPTIONS}" != "OFF" ]]; then echo "--libcxx-exceptions is a required parameter and must be either ON or OFF"; usage; exit 1; fi
 if [[ -z ${ADDITIONAL_CMAKE_ARGS+x} ]]; then ADDITIONAL_CMAKE_ARGS=""; fi
 if [[ -z ${ADDITIONAL_LIT_ARGS+x} ]]; then ADDITIONAL_LIT_ARGS=""; fi
@@ -92,9 +86,6 @@ LLVM_INSTALL_DIR="${TEMP_DIR}/llvm-install"
 
 echo "@@@ Setting up LIT flags @@@"
 LIT_FLAGS="-sv --param=std=${STD} ${ADDITIONAL_LIT_ARGS}"
-if [[ "${ARCH}" == "32" ]]; then
-  LIT_FLAGS+=" --param=enable_32bit=true"
-fi
 echo "@@@@@@"
 
 
@@ -110,7 +101,7 @@ mkdir -p "${LLVM_BUILD_DIR}"
     ${ADDITIONAL_CMAKE_ARGS} \
     -DLLVM_LIT_ARGS="${LIT_FLAGS}" \
     -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi" \
-    -DCMAKE_OSX_ARCHITECTURES="i386;x86_64" \
+    -DCMAKE_OSX_ARCHITECTURES="x86_64" \
     "${MONOREPO_ROOT}/llvm"
 )
 echo "@@@@@@"
@@ -130,3 +121,18 @@ echo "@@@@@@"
 echo "@@@ Running tests for libc++abi @@@"
 ninja -C "${LLVM_BUILD_DIR}" check-cxxabi
 echo "@@@@@@"
+
+
+# TODO: In the future, we should only build that way, and we should run the
+#       test suite against those.
+echo "@@@ Building libc++ and libc++abi using the Apple script (to make sure they work) @@@"
+"${MONOREPO_ROOT}/libcxx/utils/ci/apple-install-libcxx.sh"      \
+    --llvm-root "${MONOREPO_ROOT}"                              \
+    --build-dir "${LLVM_BUILD_DIR}/apple-build"                 \
+    --install-dir "${LLVM_BUILD_DIR}/apple-install"             \
+    --symbols-dir "${LLVM_BUILD_DIR}/apple-symbols"             \
+    --sdk macosx                                                \
+    --architectures "x86_64"                                    \
+    --version 999.99.99                                         \
+    --cache "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake"
+echo "@@@@@@"
diff --git a/gnu/llvm/libcxx/utils/ci/runtimes/CMakeLists.txt b/gnu/llvm/libcxx/utils/ci/runtimes/CMakeLists.txt
new file mode 100644
index 00000000000..43ebf9e4a19
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/ci/runtimes/CMakeLists.txt
@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.4.3)
+
+if(POLICY CMP0068)
+  cmake_policy(SET CMP0068 NEW)
+  set(CMAKE_BUILD_WITH_INSTALL_NAME_DIR ON)
+endif()
+
+if(POLICY CMP0075)
+  cmake_policy(SET CMP0075 NEW)
+endif()
+
+if(POLICY CMP0077)
+  cmake_policy(SET CMP0077 NEW)
+endif()
+
+set(PACKAGE_VERSION "11.0.0git")
+
+project(LLVM_RUNTIMES)
+
+# Include individual projects
+set(LLVM_ENABLE_PROJECTS "" CACHE STRING "Semicolon-separated list of runtimes to build.")
+
+set(LLVM_UMBRELLA_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/../../../..")
+foreach(project IN LISTS LLVM_ENABLE_PROJECTS)
+    add_subdirectory("${LLVM_UMBRELLA_ROOT}/${project}" "${CMAKE_CURRENT_BINARY_DIR}/${project}")
+endforeach()
diff --git a/gnu/llvm/libcxx/utils/docker/README.txt b/gnu/llvm/libcxx/utils/docker/README.txt
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/gnu/llvm/libcxx/utils/docker/debian9/buildbot/Dockerfile b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/Dockerfile
new file mode 100644
index 00000000000..ea2ac9d5593
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/Dockerfile
@@ -0,0 +1,40 @@
+
+#===-------------------------------------------------------------------------------------------===//
+# buildslave
+#===-------------------------------------------------------------------------------------------===//
+ARG gcc_tot
+ARG llvm_tot
+
+FROM ${gcc_tot} AS gcc-tot
+FROM ${llvm_tot} AS llvm-tot
+
+FROM debian:stretch AS base-image
+
+ADD install-packages.sh /tmp/
+RUN /tmp/install-packages.sh && rm /tmp/install-packages.sh
+
+COPY --from=ericwf/gcc:5.5.0 /compiler /opt/gcc-5
+COPY --from=ericwf/llvm:9.x /compiler /opt/llvm-9
+
+FROM base-image as worker-image
+
+COPY --from=gcc-tot /compiler /opt/gcc-tot
+COPY --from=llvm-tot /compiler /opt/llvm-tot
+
+ENV PATH /opt/llvm-tot/bin:$PATH
+
+RUN clang++ --version && echo hello
+RUN g++ --version
+
+
+RUN /opt/gcc-tot/bin/g++ --version
+RUN /opt/llvm-tot/bin/clang++ --version
+RUN /opt/llvm-tot/bin/clang --version
+
+# FIXME(EricWF): remove this once the buildbot's config doesn't clobber the path.
+RUN ln -s /opt/llvm-tot/bin/clang /usr/local/bin/clang
+RUN ln -s /opt/llvm-tot/bin/clang++ /usr/local/bin/clang++
+
+
+ADD run_buildbot.sh /
+CMD /run_buildbot.sh /run/secrets/buildbot-auth
diff --git a/gnu/llvm/libcxx/utils/docker/debian9/buildbot/buildbot-auth.json b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/buildbot-auth.json
new file mode 100644
index 00000000000..5e91e2d4158
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/buildbot-auth.json
@@ -0,0 +1,4 @@
+{
+  "login": "<login>",
+  "password": "<password>"
+}
diff --git a/gnu/llvm/libcxx/utils/docker/debian9/buildbot/docker-compose.yml b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/docker-compose.yml
new file mode 100644
index 00000000000..f9a2a2ad9c3
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/docker-compose.yml
@@ -0,0 +1,19 @@
+version: '3.7'
+services:
+  llvm-buildbot-worker:
+    build:
+      context: https://github.com/llvm/llvm-project.git#master:libcxx/utils/docker/debian9/buildbot
+      args:
+        gcc_tot: "ericwf/gcc:9.2.0"
+        llvm_tot: "ericwf/llvm:9.x"
+    image: llvm-buildbot-worker
+    volumes:
+    - /var/run/docker.sock:/var/run/docker.sock
+    secrets:
+    - buildbot-auth
+    logging:
+      driver: gcplogs
+
+secrets:
+  buildbot-auth:
+    file: buildbot-auth.json
diff --git a/gnu/llvm/libcxx/utils/docker/debian9/buildbot/install-gcloud-agents.sh b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/install-gcloud-agents.sh
new file mode 100755
index 00000000000..d2656ca5092
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/install-gcloud-agents.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+cd /tmp/
+
+curl -sSO https://dl.google.com/cloudagents/install-monitoring-agent.sh
+sudo bash install-monitoring-agent.sh
+rm install-monitoring-agent.sh
+
+curl -sSO https://dl.google.com/cloudagents/install-logging-agent.sh
+sudo bash install-logging-agent.sh
+rm install-logging-agent.sh
diff --git a/gnu/llvm/libcxx/utils/docker/debian9/buildbot/install-packages.sh b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/install-packages.sh
new file mode 100755
index 00000000000..82d14631644
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/install-packages.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -x
+set -e
+
+apt-get update && \
+    apt-get install -y --no-install-recommends \
+      buildbot-slave \
+      ca-certificates \
+      gnupg \
+      build-essential \
+      wget \
+      unzip \
+      python \
+      ninja-build \
+      curl \
+      git \
+      gcc-multilib \
+      g++-multilib \
+      libc6-dev \
+      libtool \
+      locales-all \
+      binutils-dev \
+      binutils-gold \
+      software-properties-common \
+      gnupg \
+      apt-transport-https \
+      sudo \
+      bash-completion \
+      vim \
+      jq \
+      systemd \
+      sysvinit-utils \
+      systemd-sysv && \
+  rm -rf /var/lib/apt/lists/*
+
+# Install a recent CMake
+yes | apt-get purge cmake
+wget https://github.com/Kitware/CMake/releases/download/v3.15.2/cmake-3.15.2-Linux-x86_64.sh -O /tmp/install-cmake.sh
+bash /tmp/install-cmake.sh --prefix=/usr --exclude-subdir --skip-license
diff --git a/gnu/llvm/libcxx/utils/docker/debian9/buildbot/run_buildbot.sh b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/run_buildbot.sh
new file mode 100755
index 00000000000..e008a30558c
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/docker/debian9/buildbot/run_buildbot.sh
@@ -0,0 +1,111 @@
+#!/usr/bin/env bash
+set -x
+
+readonly BOT_ROOT=/b
+readonly AUTH_FILE=$1
+readonly BOT_ROOT_NAME=$(jq -r ".login" $AUTH_FILE)
+
+systemctl daemon-reload
+service buildslave stop
+mkdir -p /b
+rm -rf /b/*
+service buildslave stop
+
+pushd /tmp/
+
+curl -sSO https://dl.google.com/cloudagents/install-monitoring-agent.sh
+sudo bash install-monitoring-agent.sh
+rm install-monitoring-agent.sh
+
+curl -sSO https://dl.google.com/cloudagents/install-logging-agent.sh
+sudo bash install-logging-agent.sh
+rm install-logging-agent.sh
+
+popd
+
+
+systemctl set-property buildslave.service TasksMax=100000
+
+function setup_numbered_bot() {
+  local BOT_NAME=$1
+  local BOT_DIR=$2
+  mkdir -p $BOT_DIR
+
+  buildslave stop $BOT_DIR
+  chown buildbot $BOT_DIR
+  rm -rf $BOT_DIR/*
+
+  buildslave create-slave --allow-shutdown=signal "$BOT_DIR" "lab.llvm.org:9990" "$BOT_NAME" $(jq -r ".password" $AUTH_FILE)
+
+  echo "Eric Fiselier <ericwf@google.com>" > $BOT_DIR/info/admin
+
+  echo "Connecting as $1"
+  {
+    uname -a | head -n1
+    cmake --version | head -n1
+    g++ --version | head -n1
+    clang++ --version | head -n1
+    ld --version | head -n1
+    date
+    lscpu
+  } > $BOT_DIR/info/host
+
+
+#echo "SLAVE_RUNNER=/usr/bin/buildslave
+#SLAVE_ENABLED[1]=\"1\"
+#SLAVE_NAME[1]=\"$BOT_NAME\"
+#SLAVE_USER[1]=\"buildbot\"
+#SLAVE_BASEDIR[1]=\"$BOT_DIR\"
+#SLAVE_OPTIONS[1]=\"\"
+#SLAVE_PREFIXCMD[1]=\"\"" > $BOT_DIR/buildslave.cfg
+
+  ls $BOT_DIR/
+  cat $BOT_DIR/buildbot.tac
+}
+
+function try_start_builder {
+  local N=$1
+  local BOT_DIR="$BOT_ROOT/b$N"
+  local BOT_NAME="$BOT_ROOT_NAME$N"
+
+  systemctl daemon-reload
+  service buildslave restart
+  setup_numbered_bot "$BOT_NAME" "$BOT_DIR"
+
+  systemctl daemon-reload
+  service buildslave restart
+
+  chown -R buildbot $BOT_DIR/
+  sudo -u buildbot /usr/bin/buildslave start $BOT_DIR/
+
+  sleep 30
+  cat $BOT_DIR/twistd.log
+  if grep --quiet "slave is ready" $BOT_DIR/twistd.log; then
+    return 0
+  fi
+  if grep --quiet "configuration update complete" $BOT_DIR/twistd.log; then
+    return 0
+  fi
+  if grep "rejecting duplicate slave" $BOT_DIR/twistd.log; then
+    return 1
+  fi
+  echo "Unknown error"
+  cat $BOT_DIR/twistd.log
+  exit 1
+}
+
+for N in `shuf -i 1-5`
+do
+  if try_start_builder $N; then
+    break
+  fi
+  echo "failed to start any buildbot"
+  shutdown now
+done
+
+# GCE can restart instance after 24h in the middle of the build.
+# Gracefully restart before that happen.
+sleep 72000
+while pkill -SIGHUP buildslave; do sleep 5; done;
+shutdown now
+
diff --git a/gnu/llvm/libcxx/utils/gdb/libcxx/printers.py b/gnu/llvm/libcxx/utils/gdb/libcxx/printers.py
index b2d589424a3..0ee446f46c5 100644
--- a/gnu/llvm/libcxx/utils/gdb/libcxx/printers.py
+++ b/gnu/llvm/libcxx/utils/gdb/libcxx/printers.py
@@ -69,6 +69,8 @@ def _remove_generics(typename):
 _common_substitutions = [
     ("std::basic_string<char, std::char_traits<char>, std::allocator<char> >",
      "std::string"),
+    ("std::basic_string_view<char, std::char_traits<char> >",
+     "std::string_view"),
 ]
 
 
@@ -243,6 +245,32 @@ class StdStringPrinter(object):
         return "string"
 
 
+class StdStringViewPrinter(object):
+    """Print a std::string_view."""
+
+    def __init__(self, val):
+      self.val = val
+
+    def to_string(self):  # pylint: disable=g-bad-name
+      """GDB calls this to compute the pretty-printed form."""
+
+      ptr = self.val["__data"]
+      length = self.val["__size"]
+      print_length = length
+      # We print more than just a simple string (i.e. we also print
+      # "of length %d").  Thus we can't use the "string" display_hint,
+      # and thus we have to handle "print elements" ourselves.
+      # For reference sake, gdb ensures limit == None or limit > 0.
+      limit = gdb.parameter("print elements")
+      if limit is not None:
+        print_length = min(print_length, limit)
+      # FIXME: Passing ISO-8859-1 here isn't always correct.
+      string = ptr.string("ISO-8859-1", "ignore", print_length)
+      if length > print_length:
+        string += "..."
+      return "std::string_view of length %d: \"%s\"" % (length, string)
+
+
 class StdUniquePtrPrinter(object):
     """Print a std::unique_ptr."""
 
@@ -670,7 +698,7 @@ class StdMapPrinter(AbstractRBTreePrinter):
 
     def _init_cast_type(self, val_type):
         map_it_type = gdb.lookup_type(
-            str(val_type) + "::iterator").strip_typedefs()
+            str(val_type.strip_typedefs()) + "::iterator").strip_typedefs()
         tree_it_type = map_it_type.template_argument(0)
         node_ptr_type = tree_it_type.template_argument(1)
         return node_ptr_type
@@ -689,7 +717,7 @@ class StdSetPrinter(AbstractRBTreePrinter):
 
     def _init_cast_type(self, val_type):
         set_it_type = gdb.lookup_type(
-            str(val_type) + "::iterator").strip_typedefs()
+            str(val_type.strip_typedefs()) + "::iterator").strip_typedefs()
         node_ptr_type = set_it_type.template_argument(1)
         return node_ptr_type
 
@@ -904,6 +932,7 @@ class LibcxxPrettyPrinter(object):
         self.lookup = {
             "basic_string": StdStringPrinter,
             "string": StdStringPrinter,
+            "string_view": StdStringViewPrinter,
             "tuple": StdTuplePrinter,
             "unique_ptr": StdUniquePtrPrinter,
             "shared_ptr": StdSharedPointerPrinter,
@@ -953,10 +982,10 @@ class LibcxxPrettyPrinter(object):
         # Don't attempt types known to be inside libstdcxx.
         typename = val.type.name or val.type.tag or str(val.type)
         match = re.match("^std::(__.*?)::", typename)
-        if match is None or match.group(1) in ["__cxx1998",
-                                               "__debug",
-                                               "__7",
-                                               "__g"]:
+        if match is not None and match.group(1) in ["__cxx1998",
+                                                    "__debug",
+                                                    "__7",
+                                                    "__g"]:
             return None
 
         # Handle any using declarations or other typedefs.
diff --git a/gnu/llvm/libcxx/utils/generate_feature_test_macro_components.py b/gnu/llvm/libcxx/utils/generate_feature_test_macro_components.py
index a6191a50899..b77f88489d9 100755
--- a/gnu/llvm/libcxx/utils/generate_feature_test_macro_components.py
+++ b/gnu/llvm/libcxx/utils/generate_feature_test_macro_components.py
@@ -200,6 +200,7 @@ feature_test_macros = sorted([ add_version_header(x) for x in [
      "c++17": int(201703),
    },
    "headers": ["new"],
+   "unimplemented": True,
    },
   {"name": "__cpp_lib_launder",
    "values": {
@@ -408,6 +409,7 @@ feature_test_macros = sorted([ add_version_header(x) for x in [
   {"name": "__cpp_lib_array_constexpr",
    "values": {
      "c++17": int(201603),
+     "c++2a": int(201811),
    },
    "headers": ["iterator", "array"],
    },
@@ -475,7 +477,7 @@ feature_test_macros = sorted([ add_version_header(x) for x in [
    },
   {"name": "__cpp_lib_erase_if",
    "values": {
-     "c++2a": int(201811),
+     "c++2a": int(202002),
    },
    "headers": ["string", "deque", "forward_list", "list", "vector", "map",
                "set", "unordered_map", "unordered_set"]
@@ -542,7 +544,6 @@ feature_test_macros = sorted([ add_version_header(x) for x in [
      "c++2a": int(201806),
    },
    "headers": ["forward_list", "list"],
-   "unimplemented": True,
    },
   {"name": "__cpp_lib_generic_unordered_lookup",
    "values": {
@@ -586,6 +587,26 @@ feature_test_macros = sorted([ add_version_header(x) for x in [
    },
    "headers": ["bit"],
    },
+  {"name": "__cpp_lib_to_array",
+   "values": {
+     "c++2a": int(201907),
+   },
+   "headers": ["array"],
+   },
+  {"name": "__cpp_lib_span",
+   "values": {
+     "c++2a": int(202002),
+   },
+   "headers": ["span"],
+   },
+  {"name": "__cpp_lib_math_constants",
+   "values": {
+     "c++2a": int(201907),
+   },
+   "headers": ["numbers"],
+   "depends": "defined(__cpp_concepts) && __cpp_concepts >= 201811L",
+   "internal_depends": "defined(__cpp_concepts) && __cpp_concepts >= 201811L",
+   },
 ]], key=lambda tc: tc["name"])
 
 def get_std_dialects():
diff --git a/gnu/llvm/libcxx/utils/google-benchmark/README.LLVM b/gnu/llvm/libcxx/utils/google-benchmark/README.LLVM
index 05c5e3ee343..ea92eee202c 100644
--- a/gnu/llvm/libcxx/utils/google-benchmark/README.LLVM
+++ b/gnu/llvm/libcxx/utils/google-benchmark/README.LLVM
@@ -14,3 +14,11 @@ Changes:
   is applied on top of
   https://github.com/google/benchmark/commit/4528c76b718acc9b57956f63069c699ae21edcab
   to fix cross-build from linux to windows via MinGW.
+* https://github.com/google/benchmark/commit/a77d5f70efaebe2b7e8c10134526a23a7ce7ef35
+  and
+  https://github.com/google/benchmark/commit/ecc1685340f58f7fe6b707036bc0bb1fccabb0c1
+  are applied on top of
+  https://github.com/google/benchmark/commit/8e48105d465c586068dd8e248fe75a8971c6ba3a
+  to fix timestamp-related inline asm issues and 32-bit RISC-V build failures.
+  The second cherrypicked commit fixes formatting issues introduced by the
+  preceding change.
diff --git a/gnu/llvm/libcxx/utils/google-benchmark/src/cycleclock.h b/gnu/llvm/libcxx/utils/google-benchmark/src/cycleclock.h
index d5d62c4c7fe..179c67cd614 100644
--- a/gnu/llvm/libcxx/utils/google-benchmark/src/cycleclock.h
+++ b/gnu/llvm/libcxx/utils/google-benchmark/src/cycleclock.h
@@ -84,13 +84,21 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() {
   return (high << 32) | low;
 #elif defined(__powerpc__) || defined(__ppc__)
   // This returns a time-base, which is not always precisely a cycle-count.
-  int64_t tbl, tbu0, tbu1;
-  asm("mftbu %0" : "=r"(tbu0));
-  asm("mftb  %0" : "=r"(tbl));
-  asm("mftbu %0" : "=r"(tbu1));
-  tbl &= -static_cast<int64_t>(tbu0 == tbu1);
-  // high 32 bits in tbu1; low 32 bits in tbl  (tbu0 is garbage)
-  return (tbu1 << 32) | tbl;
+#if defined(__powerpc64__) || defined(__ppc64__)
+  int64_t tb;
+  asm volatile("mfspr %0, 268" : "=r"(tb));
+  return tb;
+#else
+  uint32_t tbl, tbu0, tbu1;
+  asm volatile(
+      "mftbu %0\n"
+      "mftbl %1\n"
+      "mftbu %2"
+      : "=r"(tbu0), "=r"(tbl), "=r"(tbu1));
+  tbl &= -static_cast<int32_t>(tbu0 == tbu1);
+  // high 32 bits in tbu1; low 32 bits in tbl  (tbu0 is no longer needed)
+  return (static_cast<uint64_t>(tbu1) << 32) | tbl;
+#endif
 #elif defined(__sparc__)
   int64_t tick;
   asm(".byte 0x83, 0x41, 0x00, 0x00");
@@ -167,16 +175,22 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() {
 #elif defined(__riscv) // RISC-V
   // Use RDCYCLE (and RDCYCLEH on riscv32)
 #if __riscv_xlen == 32
-  uint64_t cycles_low, cycles_hi0, cycles_hi1;
-  asm("rdcycleh %0" : "=r"(cycles_hi0));
-  asm("rdcycle %0" : "=r"(cycles_lo));
-  asm("rdcycleh %0" : "=r"(cycles_hi1));
-  // This matches the PowerPC overflow detection, above
-  cycles_lo &= -static_cast<int64_t>(cycles_hi0 == cycles_hi1);
-  return (cycles_hi1 << 32) | cycles_lo;
+  uint32_t cycles_lo, cycles_hi0, cycles_hi1;
+  // This asm also includes the PowerPC overflow handling strategy, as above.
+  // Implemented in assembly because Clang insisted on branching.
+  asm volatile(
+      "rdcycleh %0\n"
+      "rdcycle %1\n"
+      "rdcycleh %2\n"
+      "sub %0, %0, %2\n"
+      "seqz %0, %0\n"
+      "sub %0, zero, %0\n"
+      "and %1, %1, %0\n"
+      : "=r"(cycles_hi0), "=r"(cycles_lo), "=r"(cycles_hi1));
+  return (static_cast<uint64_t>(cycles_hi1) << 32) | cycles_lo;
 #else
   uint64_t cycles;
-  asm("rdcycle %0" : "=r"(cycles));
+  asm volatile("rdcycle %0" : "=r"(cycles));
   return cycles;
 #endif
 #else
diff --git a/gnu/llvm/libcxx/utils/graph_header_deps.py b/gnu/llvm/libcxx/utils/graph_header_deps.py
new file mode 100755
index 00000000000..b6f0a250cce
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/graph_header_deps.py
@@ -0,0 +1,208 @@
+#!/usr/bin/env python
+#===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===----------------------------------------------------------------------===##
+
+from argparse import ArgumentParser
+import os
+import shutil
+import sys
+import shlex
+import json
+import re
+import libcxx.graph as dot
+import libcxx.util
+
+def print_and_exit(msg):
+    sys.stderr.write(msg + '\n')
+    sys.exit(1)
+
+def libcxx_include_path():
+    curr_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    include_dir = os.path.join(curr_dir, 'include')
+    return include_dir
+
+def get_libcxx_headers():
+    headers = []
+    include_dir = libcxx_include_path()
+    for fname in os.listdir(include_dir):
+        f = os.path.join(include_dir, fname)
+        if not os.path.isfile(f):
+            continue
+        base, ext = os.path.splitext(fname)
+        if (ext == '' or ext == '.h') and (not fname.startswith('__') or fname == '__config'):
+            headers += [f]
+    return headers
+
+
+def rename_headers_and_remove_test_root(graph):
+    inc_root = libcxx_include_path()
+    to_remove = set()
+    for n in graph.nodes:
+        assert 'label' in n.attributes
+        l = n.attributes['label']
+        if not l.startswith('/') and os.path.exists(os.path.join('/', l)):
+            l = '/' + l
+        if l.endswith('.tmp.cpp'):
+            to_remove.add(n)
+        if l.startswith(inc_root):
+            l = l[len(inc_root):]
+            if l.startswith('/'):
+                l = l[1:]
+        n.attributes['label'] = l
+    for n in to_remove:
+        graph.removeNode(n)
+
+def remove_non_std_headers(graph):
+    inc_root = libcxx_include_path()
+    to_remove = set()
+    for n in graph.nodes:
+        test_file = os.path.join(inc_root, n.attributes['label'])
+        if not test_file.startswith(inc_root):
+            to_remove.add(n)
+    for xn in to_remove:
+        graph.removeNode(xn)
+
+class DependencyCommand(object):
+    def __init__(self, compile_commands, output_dir, new_std=None):
+        output_dir = os.path.abspath(output_dir)
+        if not os.path.isdir(output_dir):
+            print_and_exit('"%s" must point to a directory' % output_dir)
+        self.output_dir = output_dir
+        self.new_std = new_std
+        cwd,bcmd =  self._get_base_command(compile_commands)
+        self.cwd = cwd
+        self.base_cmd = bcmd
+
+    def run_for_headers(self, header_list):
+        outputs = []
+        for header in header_list:
+            header_name = os.path.basename(header)
+            out = os.path.join(self.output_dir, ('%s.dot' % header_name))
+            outputs += [out]
+            cmd =  self.base_cmd + ["-fsyntax-only", "-Xclang", "-dependency-dot", "-Xclang", "%s" % out, '-xc++', '-']
+            libcxx.util.executeCommandOrDie(cmd, cwd=self.cwd, input='#include <%s>\n\n' % header_name)
+        return outputs
+
+    def _get_base_command(self, command_file):
+        commands = None
+        with open(command_file, 'r') as f:
+            commands = json.load(f)
+        for compile_cmd in commands:
+            file = compile_cmd['file']
+            if not file.endswith('src/algorithm.cpp'):
+                continue
+            wd = compile_cmd['directory']
+            cmd_str = compile_cmd['command']
+            cmd = shlex.split(cmd_str)
+            out_arg = cmd.index('-o')
+            del cmd[out_arg]
+            del cmd[out_arg]
+            in_arg = cmd.index('-c')
+            del cmd[in_arg]
+            del cmd[in_arg]
+            if self.new_std is not None:
+                for f in cmd:
+                    if f.startswith('-std='):
+                        del cmd[cmd.index(f)]
+                        cmd += [self.new_std]
+                        break
+            return wd, cmd
+        print_and_exit("failed to find command to build algorithm.cpp")
+
+def post_process_outputs(outputs, libcxx_only):
+    graphs = []
+    for dot_file in outputs:
+        g = dot.DirectedGraph.fromDotFile(dot_file)
+        rename_headers_and_remove_test_root(g)
+        if libcxx_only:
+            remove_non_std_headers(g)
+        graphs += [g]
+        g.toDotFile(dot_file)
+    return graphs
+
+def build_canonical_names(graphs):
+    canonical_names = {}
+    next_idx = 0
+    for g in graphs:
+        for n in g.nodes:
+            if n.attributes['label'] not in canonical_names:
+                name = 'header_%d' % next_idx
+                next_idx += 1
+                canonical_names[n.attributes['label']] = name
+    return canonical_names
+
+
+
+class CanonicalGraphBuilder(object):
+    def __init__(self, graphs):
+        self.graphs = list(graphs)
+        self.canonical_names = build_canonical_names(graphs)
+
+    def build(self):
+        self.canonical = dot.DirectedGraph('all_headers')
+        for k,v in self.canonical_names.iteritems():
+            n = dot.Node(v, edges=[], attributes={'shape': 'box', 'label': k})
+            self.canonical.addNode(n)
+        for g in self.graphs:
+            self._merge_graph(g)
+        return self.canonical
+
+    def _merge_graph(self, g):
+        for n in g.nodes:
+            new_name = self.canonical.getNodeByLabel(n.attributes['label']).id
+            for e in n.edges:
+                to_node = self.canonical.getNodeByLabel(e.attributes['label']).id
+                self.canonical.addEdge(new_name, to_node)
+
+
+def main():
+    parser = ArgumentParser(
+        description="Generate a graph of libc++ header dependencies")
+    parser.add_argument(
+        '-v', '--verbose', dest='verbose', action='store_true', default=False)
+    parser.add_argument(
+        '-o', '--output', dest='output', required=True,
+        help='The output file. stdout is used if not given',
+        type=str, action='store')
+    parser.add_argument(
+        '--no-compile', dest='no_compile', action='store_true', default=False)
+    parser.add_argument(
+        '--libcxx-only', dest='libcxx_only', action='store_true', default=False)
+    parser.add_argument(
+        'compile_commands', metavar='compile-commands-file',
+        help='the compile commands database')
+
+    args = parser.parse_args()
+    builder = DependencyCommand(args.compile_commands, args.output, new_std='-std=c++2a')
+    if not args.no_compile:
+        outputs = builder.run_for_headers(get_libcxx_headers())
+        graphs = post_process_outputs(outputs, args.libcxx_only)
+    else:
+        outputs = [os.path.join(args.output, l) for l in os.listdir(args.output) if not l.endswith('all_headers.dot')]
+        graphs = [dot.DirectedGraph.fromDotFile(o) for o in outputs]
+
+    canon = CanonicalGraphBuilder(graphs).build()
+    canon.toDotFile(os.path.join(args.output, 'all_headers.dot'))
+    all_graphs = graphs + [canon]
+
+    found_cycles = False
+    for g in all_graphs:
+        cycle_finder = dot.CycleFinder(g)
+        all_cycles = cycle_finder.findCyclesInGraph()
+        if len(all_cycles):
+            found_cycles = True
+            print("cycle in graph %s" % g.name)
+            for start, path in all_cycles:
+                print("Cycle for %s = %s" % (start, path))
+    if not found_cycles:
+        print("No cycles found")
+
+
+
+if __name__ == '__main__':
+    main()
diff --git a/gnu/llvm/libcxx/utils/libcxx/compiler.py b/gnu/llvm/libcxx/utils/libcxx/compiler.py
index dd334cdbcff..248b5ba8a98 100644
--- a/gnu/llvm/libcxx/utils/libcxx/compiler.py
+++ b/gnu/llvm/libcxx/utils/libcxx/compiler.py
@@ -29,6 +29,7 @@ class CXXCompiler(object):
         self.flags = list(flags or [])
         self.compile_flags = list(compile_flags or [])
         self.link_flags = list(link_flags or [])
+        self.link_libcxxabi_flag = '-lc++abi'
         self.warning_flags = list(warning_flags or [])
         self.verify_supported = verify_supported
         self.use_verify = use_verify
diff --git a/gnu/llvm/libcxx/utils/libcxx/graph.py b/gnu/llvm/libcxx/utils/libcxx/graph.py
new file mode 100644
index 00000000000..681d3ad2568
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/libcxx/graph.py
@@ -0,0 +1,298 @@
+#===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===----------------------------------------------------------------------===##
+
+import platform
+import os
+from collections import defaultdict
+import re
+import libcxx.util
+
+
+class DotEmitter(object):
+  def __init__(self, name):
+    self.name = name
+    self.node_strings = {}
+    self.edge_strings = []
+
+  def addNode(self, node):
+    res = str(node.id)
+    if len(node.attributes):
+      attr_strs = []
+      for k,v in node.attributes.iteritems():
+        attr_strs += ['%s="%s"' % (k, v)]
+      res += ' [ %s ]' % (', '.join(attr_strs))
+    res += ';'
+    assert node.id not in self.node_strings
+    self.node_strings[node.id] = res
+
+  def addEdge(self, n1, n2):
+    res = '%s -> %s;' % (n1.id, n2.id)
+    self.edge_strings += [res]
+
+  def node_key(self, n):
+    id = n.id
+    assert id.startswith('\w*\d+')
+
+  def emit(self):
+    node_definitions_list = []
+    sorted_keys = self.node_strings.keys()
+    sorted_keys.sort()
+    for k in sorted_keys:
+      node_definitions_list += [self.node_strings[k]]
+    node_definitions = '\n  '.join(node_definitions_list)
+    edge_list = '\n  '.join(self.edge_strings)
+    return '''
+digraph "{name}" {{
+  {node_definitions}
+  {edge_list}
+}}    
+'''.format(name=self.name, node_definitions=node_definitions, edge_list=edge_list).strip()
+
+
+class DotReader(object):
+  def __init__(self):
+    self.graph = DirectedGraph(None)
+
+  def abortParse(self, msg="bad input"):
+    raise Exception(msg)
+
+  def parse(self, data):
+    lines = [l.strip() for l in data.splitlines() if l.strip()]
+    maxIdx = len(lines)
+    idx = 0
+    if not self.parseIntroducer(lines[idx]):
+      self.abortParse('failed to parse introducer')
+    idx += 1
+    while idx < maxIdx:
+      if self.parseNodeDefinition(lines[idx]) or self.parseEdgeDefinition(lines[idx]):
+        idx += 1
+        continue
+      else:
+        break
+    if idx == maxIdx or not self.parseCloser(lines[idx]):
+      self.abortParse("no closing } found")
+    return self.graph
+
+  def parseEdgeDefinition(self, l):
+    edge_re = re.compile('^\s*(\w+)\s+->\s+(\w+);\s*$')
+    m = edge_re.match(l)
+    if not m:
+      return False
+    n1 = m.group(1)
+    n2 = m.group(2)
+    self.graph.addEdge(n1, n2)
+    return True
+
+  def parseAttributes(self, raw_str):
+    attribute_re = re.compile('^\s*(\w+)="([^"]+)"')
+    parts = [l.strip() for l in raw_str.split(',') if l.strip()]
+    attribute_dict = {}
+    for a in parts:
+      m = attribute_re.match(a)
+      if not m:
+        self.abortParse('Bad attribute "%s"' % a)
+      attribute_dict[m.group(1)] = m.group(2)
+    return attribute_dict
+
+  def parseNodeDefinition(self, l):
+    node_definition_re = re.compile('^\s*(\w+)\s+\[([^\]]+)\]\s*;\s*$')
+    m = node_definition_re.match(l)
+    if not m:
+      return False
+    id = m.group(1)
+    attributes = self.parseAttributes(m.group(2))
+    n = Node(id, edges=[], attributes=attributes)
+    self.graph.addNode(n)
+    return True
+
+  def parseIntroducer(self, l):
+    introducer_re = re.compile('^\s*digraph "([^"]+)"\s+{\s*$')
+    m = introducer_re.match(l)
+    if not m:
+      return False
+    self.graph.setName(m.group(1))
+    return True
+
+  def parseCloser(self, l):
+    closer_re = re.compile('^\s*}\s*$')
+    m = closer_re.match(l)
+    if not m:
+      return False
+    return True
+
+class Node(object):
+  def __init__(self, id, edges=[], attributes={}):
+    self.id = id
+    self.edges = set(edges)
+    self.attributes = dict(attributes)
+
+  def addEdge(self, dest):
+    self.edges.add(dest)
+
+  def __eq__(self, another):
+    if isinstance(another, str):
+      return another == self.id
+    return hasattr(another, 'id') and self.id == another.id
+
+  def __hash__(self):
+    return hash(self.id)
+
+  def __str__(self):
+    return self.attributes["label"]
+
+  def __repr__(self):
+    return self.__str__()
+    res = self.id
+    if len(self.attributes):
+      attr = []
+      for k,v in self.attributes.iteritems():
+        attr += ['%s="%s"' % (k, v)]
+      res += ' [%s ]' % (', '.join(attr))
+    return res
+
+class DirectedGraph(object):
+  def __init__(self, name=None, nodes=None):
+    self.name = name
+    self.nodes = set() if nodes is None else set(nodes)
+
+  def setName(self, n):
+    self.name = n
+
+  def _getNode(self, n_or_id):
+    if isinstance(n_or_id, Node):
+      return n_or_id
+    return self.getNode(n_or_id)
+
+  def getNode(self, str_id):
+    assert isinstance(str_id, str) or isinstance(str_id, Node)
+    for s in self.nodes:
+      if s == str_id:
+        return s
+    return None
+
+  def getNodeByLabel(self, l):
+    found = None
+    for s in self.nodes:
+      if s.attributes['label'] == l:
+        assert found is None
+        found = s
+    return found
+
+  def addEdge(self, n1, n2):
+    n1 = self._getNode(n1)
+    n2 = self._getNode(n2)
+    assert n1 in self.nodes
+    assert n2 in self.nodes
+    n1.addEdge(n2)
+
+  def addNode(self, n):
+    self.nodes.add(n)
+
+  def removeNode(self, n):
+    n = self._getNode(n)
+    for other_n in self.nodes:
+      if other_n == n:
+        continue
+      new_edges = set()
+      for e in other_n.edges:
+        if e != n:
+          new_edges.add(e)
+      other_n.edges = new_edges
+    self.nodes.remove(n)
+
+  def toDot(self):
+    dot = DotEmitter(self.name)
+    for n in self.nodes:
+      dot.addNode(n)
+      for ndest in n.edges:
+        dot.addEdge(n, ndest)
+    return dot.emit()
+
+  @staticmethod
+  def fromDot(str):
+    reader = DotReader()
+    graph = reader.parse(str)
+    return graph
+
+  @staticmethod
+  def fromDotFile(fname):
+    with open(fname, 'r') as f:
+      return DirectedGraph.fromDot(f.read())
+
+  def toDotFile(self, fname):
+    with open(fname, 'w') as f:
+      f.write(self.toDot())
+
+  def __repr__(self):
+    return self.toDot()
+
+class BFS(object):
+  def __init__(self, start):
+    self.visited = set()
+    self.to_visit = []
+    self.start = start
+
+  def __nonzero__(self):
+    return len(self.to_visit) != 0
+
+  def empty(self):
+    return len(self.to_visit) == 0
+
+  def push_back(self, node):
+    assert node not in self.visited
+    self.visited.add(node)
+    self.to_visit += [node]
+
+  def maybe_push_back(self, node):
+    if node in self.visited:
+      return
+    self.push_back(node)
+
+  def pop_front(self):
+    assert len(self.to_visit)
+    elem = self.to_visit[0]
+    del self.to_visit[0]
+    return elem
+
+  def seen(self, n):
+    return n in self.visited
+
+
+
+class CycleFinder(object):
+  def __init__(self, graph):
+    self.graph = graph
+
+  def findCycleForNode(self, n):
+    assert n in self.graph.nodes
+    all_paths = {}
+    all_cycles = []
+    bfs = BFS(n)
+    bfs.push_back(n)
+    all_paths[n] = [n]
+    while bfs:
+      n = bfs.pop_front()
+      assert n in all_paths
+      for e in n.edges:
+        en = self.graph.getNode(e)
+        if not bfs.seen(en):
+          new_path = list(all_paths[n])
+          new_path.extend([en])
+          all_paths[en] = new_path
+          bfs.push_back(en)
+        if en == bfs.start:
+          all_cycles += [all_paths[n]]
+    return all_cycles
+
+  def findCyclesInGraph(self):
+    all_cycles = []
+    for n in self.graph.nodes:
+      cycle = self.findCycleForNode(n)
+      if cycle:
+        all_cycles += [(n, cycle)]
+    return all_cycles
diff --git a/gnu/llvm/libcxx/utils/libcxx/sym_check/util.py b/gnu/llvm/libcxx/utils/libcxx/sym_check/util.py
index 0ebde9034ca..4b04ac4dfe2 100644
--- a/gnu/llvm/libcxx/utils/libcxx/sym_check/util.py
+++ b/gnu/llvm/libcxx/utils/libcxx/sym_check/util.py
@@ -31,7 +31,7 @@ def read_syms_from_file(filename):
     return read_syms_from_list(data.splitlines())
 
 
-def read_blacklist(filename):
+def read_exclusions(filename):
     with open(filename, 'r') as f:
         data = f.read()
     lines = [l.strip() for l in data.splitlines() if l.strip()]
diff --git a/gnu/llvm/libcxx/utils/libcxx/test/config.py b/gnu/llvm/libcxx/utils/libcxx/test/config.py
index 3c9b3cd6f55..b88b085d408 100644
--- a/gnu/llvm/libcxx/utils/libcxx/test/config.py
+++ b/gnu/llvm/libcxx/utils/libcxx/test/config.py
@@ -6,7 +6,7 @@
 #
 #===----------------------------------------------------------------------===##
 
-import locale
+import copy
 import os
 import platform
 import pkgutil
@@ -18,9 +18,9 @@ import sys
 
 from libcxx.compiler import CXXCompiler
 from libcxx.test.target_info import make_target_info
-from libcxx.test.executor import *
-from libcxx.test.tracing import *
 import libcxx.util
+import libcxx.test.features
+import libcxx.test.params
 
 def loadSiteConfig(lit_config, config, param_name, env_name):
     # We haven't loaded the site specific configuration (the user is
@@ -72,10 +72,8 @@ class Configuration(object):
         self.debug_build = self.get_lit_bool('debug_build',   default=False)
         self.exec_env = dict()
         self.use_target = False
-        self.use_system_cxx_lib = False
+        self.use_system_cxx_lib = self.get_lit_bool('use_system_cxx_lib', False)
         self.use_clang_verify = False
-        self.long_tests = None
-        self.execute_external = False
 
     def get_lit_conf(self, name, default=None):
         val = self.lit_config.params.get(name, None)
@@ -111,11 +109,6 @@ class Configuration(object):
             return check_value(val, env_var)
         return check_value(conf_val, name)
 
-    def get_modules_enabled(self):
-        return self.get_lit_bool('enable_modules',
-                                default=False,
-                                env_var='LIBCXX_ENABLE_MODULES')
-
     def make_static_lib_name(self, name):
         """Return the full filename for the specified library name"""
         if self.target_info.is_windows():
@@ -127,31 +120,38 @@ class Configuration(object):
     def configure(self):
         self.configure_target_info()
         self.configure_executor()
-        self.configure_use_system_cxx_lib()
         self.configure_cxx()
         self.configure_triple()
         self.configure_deployment()
         self.configure_src_root()
         self.configure_obj_root()
-        self.configure_cxx_stdlib_under_test()
-        self.configure_cxx_library_root()
-        self.configure_use_clang_verify()
-        self.configure_use_thread_safety()
-        self.configure_execute_external()
-        self.configure_ccache()
+        self.cxx_stdlib_under_test = self.get_lit_conf('cxx_stdlib_under_test', 'libc++')
+        self.cxx_library_root = self.get_lit_conf('cxx_library_root', self.libcxx_obj_root)
+        self.abi_library_root = self.get_lit_conf('abi_library_path', None)
+        self.cxx_runtime_root = self.get_lit_conf('cxx_runtime_root', self.cxx_library_root)
         self.configure_compile_flags()
-        self.configure_filesystem_compile_flags()
         self.configure_link_flags()
         self.configure_env()
-        self.configure_color_diagnostics()
         self.configure_debug_mode()
         self.configure_warnings()
         self.configure_sanitizer()
         self.configure_coverage()
         self.configure_modules()
-        self.configure_coroutines()
         self.configure_substitutions()
         self.configure_features()
+        self.configure_new_params()
+        self.configure_new_features()
+
+    def configure_new_features(self):
+        supportedFeatures = [f for f in libcxx.test.features.features if f.isSupported(self.config)]
+        for feature in supportedFeatures:
+            feature.enableIn(self.config)
+
+    def configure_new_params(self):
+        for param in libcxx.test.params.parameters:
+            feature = param.getFeature(self.config, self.lit_config.params)
+            if feature:
+                feature.enableIn(self.config)
 
     def print_config_info(self):
         # Print the final compile and link flags.
@@ -167,12 +167,14 @@ class Configuration(object):
         self.lit_config.note('Using link flags: %s' % self.cxx.link_flags)
         # Print as list to prevent "set([...])" from being printed.
         self.lit_config.note('Using available_features: %s' %
-                             list(self.config.available_features))
+                             list(sorted(self.config.available_features)))
         show_env_vars = {}
         for k,v in self.exec_env.items():
             if k not in os.environ or os.environ[k] != v:
                 show_env_vars[k] = v
         self.lit_config.note('Adding environment variables: %r' % show_env_vars)
+        self.lit_config.note("Linking against the C++ Library at {}".format(self.cxx_library_root))
+        self.lit_config.note("Running against the C++ Library at {}".format(self.cxx_runtime_root))
         sys.stderr.flush()  # Force flushing to avoid broken output on Windows
 
     def get_test_format(self):
@@ -180,30 +182,12 @@ class Configuration(object):
         return LibcxxTestFormat(
             self.cxx,
             self.use_clang_verify,
-            self.execute_external,
             self.executor,
             exec_env=self.exec_env)
 
     def configure_executor(self):
-        exec_str = self.get_lit_conf('executor', "None")
-        te = eval(exec_str)
-        if te:
-            self.lit_config.note("Using executor: %r" % exec_str)
-            if self.lit_config.useValgrind:
-                # We have no way of knowing where in the chain the
-                # ValgrindExecutor is supposed to go. It is likely
-                # that the user wants it at the end, but we have no
-                # way of getting at that easily.
-                self.lit_config.fatal("Cannot infer how to create a Valgrind "
-                                      " executor.")
-        else:
-            te = LocalExecutor()
-            if self.lit_config.useValgrind:
-                te = ValgrindExecutor(self.lit_config.valgrindArgs, te)
-
-        te.target_info = self.target_info
-
-        self.executor = te
+        self.executor = self.get_lit_conf('executor')
+        self.lit_config.note("Using executor: {}".format(self.executor))
 
     def configure_target_info(self):
         self.target_info = make_target_info(self)
@@ -232,21 +216,7 @@ class Configuration(object):
                                   '(e.g., --param=cxx_under_test=clang++)')
         self.cxx = CXXCompiler(self, cxx) if not self.cxx_is_clang_cl else \
                    self._configure_clang_cl(cxx)
-        cxx_type = self.cxx.type
-        if cxx_type is not None:
-            assert self.cxx.version is not None
-            maj_v, min_v, patch_v = self.cxx.version
-            self.config.available_features.add(cxx_type)
-            self.config.available_features.add('%s-%s' % (cxx_type, maj_v))
-            self.config.available_features.add('%s-%s.%s' % (
-                cxx_type, maj_v, min_v))
-            self.config.available_features.add('%s-%s.%s.%s' % (
-                cxx_type, maj_v, min_v, patch_v))
         self.cxx.compile_env = dict(os.environ)
-        # 'CCACHE_CPP2' prevents ccache from stripping comments while
-        # preprocessing. This is required to prevent stripping of '-verify'
-        # comments.
-        self.cxx.compile_env['CCACHE_CPP2'] = '1'
 
     def _configure_clang_cl(self, clang_path):
         def _split_env_var(var):
@@ -266,17 +236,6 @@ class Configuration(object):
                            compile_flags=compile_flags,
                            link_flags=link_flags)
 
-    def _dump_macros_verbose(self, *args, **kwargs):
-        macros_or_error = self.cxx.dumpMacros(*args, **kwargs)
-        if isinstance(macros_or_error, tuple):
-            cmd, out, err, rc = macros_or_error
-            report = libcxx.util.makeReport(cmd, out, err, rc)
-            report += "Compiler failed unexpectedly when dumping macros!"
-            self.lit_config.fatal(report)
-            return None
-        assert isinstance(macros_or_error, dict)
-        return macros_or_error
-
     def configure_src_root(self):
         self.libcxx_src_root = self.get_lit_conf(
             'libcxx_src_root', os.path.dirname(self.config.test_source_root))
@@ -297,184 +256,35 @@ class Configuration(object):
             else:
                 self.libcxx_obj_root = self.project_obj_root
 
-    def configure_cxx_library_root(self):
-        self.cxx_library_root = self.get_lit_conf('cxx_library_root',
-                                                  self.libcxx_obj_root)
-        self.cxx_runtime_root = self.get_lit_conf('cxx_runtime_root',
-                                                   self.cxx_library_root)
-
-    def configure_use_system_cxx_lib(self):
-        # This test suite supports testing against either the system library or
-        # the locally built one; the former mode is useful for testing ABI
-        # compatibility between the current headers and a shipping dynamic
-        # library.
-        # Default to testing against the locally built libc++ library.
-        self.use_system_cxx_lib = self.get_lit_conf('use_system_cxx_lib')
-        if self.use_system_cxx_lib == 'true':
-            self.use_system_cxx_lib = True
-        elif self.use_system_cxx_lib == 'false':
-            self.use_system_cxx_lib = False
-        elif self.use_system_cxx_lib:
-            assert os.path.isdir(self.use_system_cxx_lib), "the specified use_system_cxx_lib parameter (%s) is not a valid directory" % self.use_system_cxx_lib
-            self.use_system_cxx_lib = os.path.abspath(self.use_system_cxx_lib)
-        self.lit_config.note(
-            "inferred use_system_cxx_lib as: %r" % self.use_system_cxx_lib)
-
-    def configure_cxx_stdlib_under_test(self):
-        self.cxx_stdlib_under_test = self.get_lit_conf(
-            'cxx_stdlib_under_test', 'libc++')
-        if self.cxx_stdlib_under_test not in \
-                ['libc++', 'libstdc++', 'msvc', 'cxx_default']:
-            self.lit_config.fatal(
-                'unsupported value for "cxx_stdlib_under_test": %s'
-                % self.cxx_stdlib_under_test)
-        self.config.available_features.add(self.cxx_stdlib_under_test)
-        if self.cxx_stdlib_under_test == 'libstdc++':
-            self.config.available_features.add('libstdc++')
-            # Manually enable the experimental and filesystem tests for libstdc++
-            # if the options aren't present.
-            # FIXME this is a hack.
-            if self.get_lit_conf('enable_experimental') is None:
-                self.config.enable_experimental = 'true'
-
-    def configure_use_clang_verify(self):
-        '''If set, run clang with -verify on failing tests.'''
-        self.use_clang_verify = self.get_lit_bool('use_clang_verify')
-        if self.use_clang_verify is None:
-            # NOTE: We do not test for the -verify flag directly because
-            #   -verify will always exit with non-zero on an empty file.
-            self.use_clang_verify = self.cxx.isVerifySupported()
-            self.lit_config.note(
-                "inferred use_clang_verify as: %r" % self.use_clang_verify)
-        if self.use_clang_verify:
-                self.config.available_features.add('verify-support')
-
-    def configure_use_thread_safety(self):
-        '''If set, run clang with -verify on failing tests.'''
-        has_thread_safety = self.cxx.hasCompileFlag('-Werror=thread-safety')
-        if has_thread_safety:
-            self.cxx.compile_flags += ['-Werror=thread-safety']
-            self.config.available_features.add('thread-safety')
-            self.lit_config.note("enabling thread-safety annotations")
-
-    def configure_execute_external(self):
-        # Choose between lit's internal shell pipeline runner and a real shell.
-        # If LIT_USE_INTERNAL_SHELL is in the environment, we use that as the
-        # default value. Otherwise we ask the target_info.
-        use_lit_shell_default = os.environ.get('LIT_USE_INTERNAL_SHELL')
-        if use_lit_shell_default is not None:
-            use_lit_shell_default = use_lit_shell_default != '0'
-        else:
-            use_lit_shell_default = self.target_info.use_lit_shell_default()
-        # Check for the command line parameter using the default value if it is
-        # not present.
-        use_lit_shell = self.get_lit_bool('use_lit_shell',
-                                          use_lit_shell_default)
-        self.execute_external = not use_lit_shell
-
-    def configure_ccache(self):
-        use_ccache_default = os.environ.get('LIBCXX_USE_CCACHE') is not None
-        use_ccache = self.get_lit_bool('use_ccache', use_ccache_default)
-        if use_ccache:
-            self.cxx.use_ccache = True
-            self.lit_config.note('enabling ccache')
-
-    def add_deployment_feature(self, feature):
-        (arch, name, version) = self.config.deployment
-        self.config.available_features.add('%s=%s-%s' % (feature, arch, name))
-        self.config.available_features.add('%s=%s' % (feature, name))
-        self.config.available_features.add('%s=%s%s' % (feature, name, version))
-
     def configure_features(self):
         additional_features = self.get_lit_conf('additional_features')
         if additional_features:
             for f in additional_features.split(','):
                 self.config.available_features.add(f.strip())
-        self.target_info.add_locale_features(self.config.available_features)
-
-        target_platform = self.target_info.platform()
 
         # Write an "available feature" that combines the triple when
         # use_system_cxx_lib is enabled. This is so that we can easily write
         # XFAIL markers for tests that are known to fail with versions of
         # libc++ as were shipped with a particular triple.
         if self.use_system_cxx_lib:
-            self.config.available_features.add('with_system_cxx_lib')
-            self.config.available_features.add(
-                'with_system_cxx_lib=%s' % self.config.target_triple)
-
-            # Add subcomponents individually.
-            target_components = self.config.target_triple.split('-')
-            for component in target_components:
-                self.config.available_features.add(
-                    'with_system_cxx_lib=%s' % component)
+            self.config.available_features.add('with_system_cxx_lib=%s' % self.config.target_triple)
 
             # Add available features for more generic versions of the target
             # triple attached to  with_system_cxx_lib.
             if self.use_deployment:
-                self.add_deployment_feature('with_system_cxx_lib')
+                (_, name, version) = self.config.deployment
+                self.config.available_features.add('with_system_cxx_lib=%s' % name)
+                self.config.available_features.add('with_system_cxx_lib=%s%s' % (name, version))
 
         # Configure the availability feature. Availability is only enabled
         # with libc++, because other standard libraries do not provide
         # availability markup.
         if self.use_deployment and self.cxx_stdlib_under_test == 'libc++':
-            self.config.available_features.add('availability')
-            self.add_deployment_feature('availability')
-
-        if self.target_info.is_darwin():
-            self.config.available_features.add('apple-darwin')
-
-        # Insert the platform name into the available features as a lower case.
-        self.config.available_features.add(target_platform)
-
-        # Simulator testing can take a really long time for some of these tests
-        # so add a feature check so we can REQUIRES: long_tests in them
-        self.long_tests = self.get_lit_bool('long_tests')
-        if self.long_tests is None:
-            # Default to running long tests.
-            self.long_tests = True
-            self.lit_config.note(
-                "inferred long_tests as: %r" % self.long_tests)
-
-        if self.long_tests:
-            self.config.available_features.add('long_tests')
-
-        if not self.get_lit_bool('enable_filesystem', default=True):
-            self.config.available_features.add('c++filesystem-disabled')
-            self.config.available_features.add('dylib-has-no-filesystem')
-
-
-        # Run a compile test for the -fsized-deallocation flag. This is needed
-        # in test/std/language.support/support.dynamic/new.delete
-        if self.cxx.hasCompileFlag('-fsized-deallocation'):
-            self.config.available_features.add('-fsized-deallocation')
-
-        if self.cxx.hasCompileFlag('-faligned-allocation'):
-            self.config.available_features.add('-faligned-allocation')
-        else:
-            # FIXME remove this once more than just clang-4.0 support
-            # C++17 aligned allocation.
-            self.config.available_features.add('no-aligned-allocation')
-
-        if self.cxx.hasCompileFlag('-fdelayed-template-parsing'):
-            self.config.available_features.add('fdelayed-template-parsing')
-
-        if self.get_lit_bool('has_libatomic', False):
-            self.config.available_features.add('libatomic')
-
-        macros = self._dump_macros_verbose()
-        if '__cpp_if_constexpr' not in macros:
-            self.config.available_features.add('libcpp-no-if-constexpr')
-
-        if '__cpp_structured_bindings' not in macros:
-            self.config.available_features.add('libcpp-no-structured-bindings')
-
-        if '__cpp_deduction_guides' not in macros or \
-                intMacroValue(macros['__cpp_deduction_guides']) < 201611:
-            self.config.available_features.add('libcpp-no-deduction-guides')
+            (_, name, version) = self.config.deployment
+            self.config.available_features.add('availability=%s' % name)
+            self.config.available_features.add('availability=%s%s' % (name, version))
 
         if self.target_info.is_windows():
-            self.config.available_features.add('windows')
             if self.cxx_stdlib_under_test == 'libc++':
                 # LIBCXX-WINDOWS-FIXME is the feature name used to XFAIL the
                 # initial Windows failures until they can be properly diagnosed
@@ -483,26 +293,11 @@ class Configuration(object):
                 # using this feature. (Also see llvm.org/PR32730)
                 self.config.available_features.add('LIBCXX-WINDOWS-FIXME')
 
-        # Attempt to detect the glibc version by querying for __GLIBC__
-        # in 'features.h'.
-        macros = self.cxx.dumpMacros(flags=['-include', 'features.h'])
-        if isinstance(macros, dict) and '__GLIBC__' in macros:
-            maj_v, min_v = (macros['__GLIBC__'], macros['__GLIBC_MINOR__'])
-            self.config.available_features.add('glibc')
-            self.config.available_features.add('glibc-%s' % maj_v)
-            self.config.available_features.add('glibc-%s.%s' % (maj_v, min_v))
-
         libcxx_gdb = self.get_lit_conf('libcxx_gdb')
         if libcxx_gdb and 'NOTFOUND' not in libcxx_gdb:
             self.config.available_features.add('libcxx_gdb')
             self.cxx.libcxx_gdb = libcxx_gdb
 
-        # Support Objective-C++ only on MacOS and if the compiler supports it.
-        if self.target_info.platform() == "darwin" and \
-           self.target_info.is_host_macosx() and \
-           self.cxx.hasCompileFlag(["-x", "objective-c++", "-fobjc-arc"]):
-            self.config.available_features.add("objective-c++")
-
     def configure_compile_flags(self):
         self.configure_default_compile_flags()
         # Configure extra flags
@@ -520,45 +315,11 @@ class Configuration(object):
             self.cxx.compile_flags += shlex.split(additional_flags)
 
     def configure_default_compile_flags(self):
-        # Try and get the std version from the command line. Fall back to
-        # default given in lit.site.cfg is not present. If default is not
-        # present then force c++11.
-        std = self.get_lit_conf('std')
-        if not std:
-            # Choose the newest possible language dialect if none is given.
-            possible_stds = ['c++2a', 'c++17', 'c++1z', 'c++14', 'c++11',
-                             'c++03']
-            if self.cxx.type == 'gcc':
-                maj_v, _, _ = self.cxx.version
-                maj_v = int(maj_v)
-                if maj_v < 7:
-                    possible_stds.remove('c++1z')
-                    possible_stds.remove('c++17')
-                # FIXME: How many C++14 tests actually fail under GCC 5 and 6?
-                # Should we XFAIL them individually instead?
-                if maj_v <= 6:
-                    possible_stds.remove('c++14')
-            for s in possible_stds:
-                if self.cxx.hasCompileFlag('-std=%s' % s):
-                    std = s
-                    self.lit_config.note(
-                        'inferred language dialect as: %s' % std)
-                    break
-            if not std:
-                self.lit_config.fatal(
-                    'Failed to infer a supported language dialect from one of %r'
-                    % possible_stds)
-        self.cxx.compile_flags += ['-std={0}'.format(std)]
-        std_feature = std.replace('gnu++', 'c++')
-        std_feature = std.replace('1z', '17')
-        self.config.available_features.add(std_feature)
         # Configure include paths
         self.configure_compile_flags_header_includes()
         self.target_info.add_cxx_compile_flags(self.cxx.compile_flags)
         # Configure feature flags.
-        self.configure_compile_flags_exceptions()
         self.configure_compile_flags_rtti()
-        self.configure_compile_flags_abi_version()
         enable_32bit = self.get_lit_bool('enable_32bit', False)
         if enable_32bit:
             self.cxx.flags += ['-m32']
@@ -599,10 +360,6 @@ class Configuration(object):
             self.cxx.compile_flags += ['-I' + os.path.join(pstl_src_root, 'test')]
             self.config.available_features.add('parallel-algorithms')
 
-        # FIXME(EricWF): variant_size.pass.cpp requires a slightly larger
-        # template depth with older Clang versions.
-        self.cxx.addFlagIfSupported('-ftemplate-depth=270')
-
     def configure_compile_flags_header_includes(self):
         support_path = os.path.join(self.libcxx_src_root, 'test', 'support')
         self.configure_config_site_header()
@@ -647,108 +404,13 @@ class Configuration(object):
         config_site_header = os.path.join(self.libcxx_obj_root, '__config_site')
         if not os.path.isfile(config_site_header):
             return
-        contained_macros = self.parse_config_site_and_add_features(
-            config_site_header)
-        self.lit_config.note('Using __config_site header %s with macros: %r'
-            % (config_site_header, contained_macros))
-        # FIXME: This must come after the call to
-        # 'parse_config_site_and_add_features(...)' in order for it to work.
         self.cxx.compile_flags += ['-include', config_site_header]
 
-    def parse_config_site_and_add_features(self, header):
-        """ parse_config_site_and_add_features - Deduce and add the test
-            features that that are implied by the #define's in the __config_site
-            header. Return a dictionary containing the macros found in the
-            '__config_site' header.
-        """
-        # Parse the macro contents of __config_site by dumping the macros
-        # using 'c++ -dM -E' and filtering the predefines.
-        predefines = self._dump_macros_verbose()
-        macros = self._dump_macros_verbose(header)
-        feature_macros_keys = set(macros.keys()) - set(predefines.keys())
-        feature_macros = {}
-        for k in feature_macros_keys:
-            feature_macros[k] = macros[k]
-        # We expect the header guard to be one of the definitions
-        assert '_LIBCPP_CONFIG_SITE' in feature_macros
-        del feature_macros['_LIBCPP_CONFIG_SITE']
-        # The __config_site header should be non-empty. Otherwise it should
-        # have never been emitted by CMake.
-        assert len(feature_macros) > 0
-        # FIXME: This is a hack that should be fixed using module maps.
-        # If modules are enabled then we have to lift all of the definitions
-        # in __config_site onto the command line.
-        for m in feature_macros:
-            define = '-D%s' % m
-            if feature_macros[m]:
-                define += '=%s' % (feature_macros[m])
-            self.cxx.modules_flags += [define]
-        self.cxx.compile_flags += ['-Wno-macro-redefined']
-        # Transform each macro name into the feature name used in the tests.
-        # Ex. _LIBCPP_HAS_NO_THREADS -> libcpp-has-no-threads
-        for m in feature_macros:
-            if m == '_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS' or \
-               m == '_LIBCPP_HIDE_FROM_ABI_PER_TU_BY_DEFAULT':
-                continue
-            if m == '_LIBCPP_ABI_VERSION':
-                self.config.available_features.add('libcpp-abi-version-v%s'
-                    % feature_macros[m])
-                continue
-            if m == '_LIBCPP_NO_VCRUNTIME':
-                self.config.available_features.add('libcpp-no-vcruntime')
-                continue
-            assert m.startswith('_LIBCPP_HAS_') or m.startswith('_LIBCPP_ABI_')
-            m = m.lower()[1:].replace('_', '-')
-            self.config.available_features.add(m)
-        return feature_macros
-
-
-
-    def configure_compile_flags_exceptions(self):
-        enable_exceptions = self.get_lit_bool('enable_exceptions', True)
-        if not enable_exceptions:
-            self.config.available_features.add('libcpp-no-exceptions')
-            self.cxx.compile_flags += ['-fno-exceptions']
-
     def configure_compile_flags_rtti(self):
         enable_rtti = self.get_lit_bool('enable_rtti', True)
         if not enable_rtti:
-            self.config.available_features.add('libcpp-no-rtti')
-            self.cxx.compile_flags += ['-fno-rtti', '-D_LIBCPP_NO_RTTI']
-
-    def configure_compile_flags_abi_version(self):
-        abi_version = self.get_lit_conf('abi_version', '').strip()
-        abi_unstable = self.get_lit_bool('abi_unstable')
-        # Only add the ABI version when it is non-default.
-        # FIXME(EricWF): Get the ABI version from the "__config_site".
-        if abi_version and abi_version != '1':
-          self.cxx.compile_flags += ['-D_LIBCPP_ABI_VERSION=' + abi_version]
-        if abi_unstable:
-          self.config.available_features.add('libcpp-abi-unstable')
-          self.cxx.compile_flags += ['-D_LIBCPP_ABI_UNSTABLE']
-
-    def configure_filesystem_compile_flags(self):
-        static_env = os.path.join(self.libcxx_src_root, 'test', 'std',
-                                  'input.output', 'filesystems', 'Inputs', 'static_test_env')
-        static_env = os.path.realpath(static_env)
-        assert os.path.isdir(static_env)
-        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_STATIC_TEST_ROOT="%s"' % static_env]
-
-        dynamic_env = os.path.join(self.config.test_exec_root,
-                                   'filesystem', 'Output', 'dynamic_env')
-        dynamic_env = os.path.realpath(dynamic_env)
-        if not os.path.isdir(dynamic_env):
-            os.makedirs(dynamic_env)
-        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_ROOT="%s"' % dynamic_env]
-        self.exec_env['LIBCXX_FILESYSTEM_DYNAMIC_TEST_ROOT'] = ("%s" % dynamic_env)
-
-        dynamic_helper = os.path.join(self.libcxx_src_root, 'test', 'support',
-                                      'filesystem_dynamic_test_helper.py')
-        assert os.path.isfile(dynamic_helper)
-
-        self.cxx.compile_flags += ['-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_HELPER="%s %s"'
-                                   % (sys.executable, dynamic_helper)]
-
+            self.config.available_features.add('-fno-rtti')
+            self.cxx.compile_flags += ['-fno-rtti']
 
     def configure_link_flags(self):
         # Configure library path
@@ -765,7 +427,6 @@ class Configuration(object):
             self.configure_link_flags_abi_library()
             self.configure_extra_library_flags()
         elif self.cxx_stdlib_under_test == 'libstdc++':
-            self.config.available_features.add('c++experimental')
             self.cxx.link_flags += ['-lstdc++fs', '-lm', '-pthread']
         elif self.cxx_stdlib_under_test == 'msvc':
             # FIXME: Correctly setup debug/release flags here.
@@ -779,31 +440,22 @@ class Configuration(object):
         self.cxx.link_flags += shlex.split(link_flags_str)
 
     def configure_link_flags_cxx_library_path(self):
-        if not self.use_system_cxx_lib:
-            if self.cxx_library_root:
-                self.cxx.link_flags += ['-L' + self.cxx_library_root]
-                if self.target_info.is_windows() and self.link_shared:
-                    self.add_path(self.cxx.compile_env, self.cxx_library_root)
-            if self.cxx_runtime_root:
-                if not self.target_info.is_windows():
-                    self.cxx.link_flags += ['-Wl,-rpath,' +
-                                            self.cxx_runtime_root]
-                elif self.target_info.is_windows() and self.link_shared:
-                    self.add_path(self.exec_env, self.cxx_runtime_root)
-        elif os.path.isdir(str(self.use_system_cxx_lib)):
-            self.cxx.link_flags += ['-L' + self.use_system_cxx_lib]
+        if self.cxx_library_root:
+            self.cxx.link_flags += ['-L' + self.cxx_library_root]
+            if self.target_info.is_windows() and self.link_shared:
+                self.add_path(self.cxx.compile_env, self.cxx_library_root)
+        if self.cxx_runtime_root:
             if not self.target_info.is_windows():
                 self.cxx.link_flags += ['-Wl,-rpath,' +
-                                        self.use_system_cxx_lib]
-            if self.target_info.is_windows() and self.link_shared:
-                self.add_path(self.cxx.compile_env, self.use_system_cxx_lib)
+                                        self.cxx_runtime_root]
+            elif self.target_info.is_windows() and self.link_shared:
+                self.add_path(self.exec_env, self.cxx_runtime_root)
         additional_flags = self.get_lit_conf('test_linker_flags')
         if additional_flags:
             self.cxx.link_flags += shlex.split(additional_flags)
 
     def configure_link_flags_abi_library_path(self):
         # Configure ABI library paths.
-        self.abi_library_root = self.get_lit_conf('abi_library_path')
         if self.abi_library_root:
             self.cxx.link_flags += ['-L' + self.abi_library_root]
             if not self.target_info.is_windows():
@@ -812,17 +464,12 @@ class Configuration(object):
                 self.add_path(self.exec_env, self.abi_library_root)
 
     def configure_link_flags_cxx_library(self):
-        libcxx_experimental = self.get_lit_bool('enable_experimental', default=False)
-        if libcxx_experimental:
-            self.config.available_features.add('c++experimental')
-            self.cxx.link_flags += ['-lc++experimental']
         if self.link_shared:
             self.cxx.link_flags += ['-lc++']
         else:
-            cxx_library_root = self.get_lit_conf('cxx_library_root')
-            if cxx_library_root:
+            if self.cxx_library_root:
                 libname = self.make_static_lib_name('c++')
-                abs_path = os.path.join(cxx_library_root, libname)
+                abs_path = os.path.join(self.cxx_library_root, libname)
                 assert os.path.exists(abs_path) and \
                        "static libc++ library does not exist"
                 self.cxx.link_flags += [abs_path]
@@ -845,10 +492,10 @@ class Configuration(object):
                 if libcxxabi_shared:
                     self.cxx.link_flags += ['-lc++abi']
                 else:
-                    cxxabi_library_root = self.get_lit_conf('abi_library_path')
-                    if cxxabi_library_root:
+                    if self.abi_library_root:
                         libname = self.make_static_lib_name('c++abi')
-                        abs_path = os.path.join(cxxabi_library_root, libname)
+                        abs_path = os.path.join(self.abi_library_root, libname)
+                        self.cxx.link_libcxxabi_flag = abs_path
                         self.cxx.link_flags += [abs_path]
                     else:
                         self.cxx.link_flags += ['-lc++abi']
@@ -871,25 +518,6 @@ class Configuration(object):
             self.cxx.link_flags += ['-lc++external_threads']
         self.target_info.add_cxx_link_flags(self.cxx.link_flags)
 
-    def configure_color_diagnostics(self):
-        use_color = self.get_lit_conf('color_diagnostics')
-        if use_color is None:
-            use_color = os.environ.get('LIBCXX_COLOR_DIAGNOSTICS')
-        if use_color is None:
-            return
-        if use_color != '':
-            self.lit_config.fatal('Invalid value for color_diagnostics "%s".'
-                                  % use_color)
-        color_flag = '-fdiagnostics-color=always'
-        # Check if the compiler supports the color diagnostics flag. Issue a
-        # warning if it does not since color diagnostics have been requested.
-        if not self.cxx.hasCompileFlag(color_flag):
-            self.lit_config.warning(
-                'color diagnostics have been requested but are not supported '
-                'by the compiler')
-        else:
-            self.cxx.flags += [color_flag]
-
     def configure_debug_mode(self):
         debug_level = self.get_lit_conf('debug_level', None)
         if not debug_level:
@@ -900,20 +528,17 @@ class Configuration(object):
         self.cxx.compile_flags += ['-D_LIBCPP_DEBUG=%s' % debug_level]
 
     def configure_warnings(self):
-        # Turn on warnings by default for Clang based compilers when C++ >= 11
-        default_enable_warnings = self.cxx.type in ['clang', 'apple-clang'] \
-            and len(self.config.available_features.intersection(
-                ['c++11', 'c++14', 'c++17', 'c++2a'])) != 0
+        # Turn on warnings by default for Clang based compilers
+        default_enable_warnings = self.cxx.type in ['clang', 'apple-clang']
         enable_warnings = self.get_lit_bool('enable_warnings',
                                             default_enable_warnings)
         self.cxx.useWarnings(enable_warnings)
-        self.cxx.warning_flags += [
-            '-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER',
-            '-Wall', '-Wextra', '-Werror'
-        ]
-        if self.cxx.hasWarningFlag('-Wuser-defined-warnings'):
-            self.cxx.warning_flags += ['-Wuser-defined-warnings']
-            self.config.available_features.add('diagnose-if-support')
+        self.cxx.warning_flags += ['-Werror', '-Wall', '-Wextra']
+        # On GCC, the libc++ headers cause errors due to throw() decorators
+        # on operator new clashing with those from the test suite, so we
+        # don't enable warnings in system headers on GCC.
+        if self.cxx.type != 'gcc':
+            self.cxx.warning_flags += ['-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER']
         self.cxx.addWarningFlagIfSupported('-Wshadow')
         self.cxx.addWarningFlagIfSupported('-Wno-unused-command-line-argument')
         self.cxx.addWarningFlagIfSupported('-Wno-attributes')
@@ -922,6 +547,7 @@ class Configuration(object):
         self.cxx.addWarningFlagIfSupported('-Wno-user-defined-literals')
         self.cxx.addWarningFlagIfSupported('-Wno-noexcept-type')
         self.cxx.addWarningFlagIfSupported('-Wno-aligned-allocation-unavailable')
+        self.cxx.addWarningFlagIfSupported('-Wno-atomic-alignment')
         # These warnings should be enabled in order to support the MSVC
         # team using the test suite; They enable the warnings below and
         # expect the test suite to be clean.
@@ -929,16 +555,11 @@ class Configuration(object):
         self.cxx.addWarningFlagIfSupported('-Wunused-variable')
         self.cxx.addWarningFlagIfSupported('-Wunused-parameter')
         self.cxx.addWarningFlagIfSupported('-Wunreachable-code')
-        std = self.get_lit_conf('std', None)
-        if std in ['c++98', 'c++03']:
-            # The '#define static_assert' provided by libc++ in C++03 mode
-            # causes an unused local typedef whenever it is used.
-            self.cxx.addWarningFlagIfSupported('-Wno-unused-local-typedef')
+        self.cxx.addWarningFlagIfSupported('-Wno-unused-local-typedef')
 
     def configure_sanitizer(self):
         san = self.get_lit_conf('use_sanitizer', '').strip()
         if san:
-            self.target_info.add_sanitizer_features(san, self.config.available_features)
             # Search for llvm-symbolizer along the compiler path first
             # and then along the PATH env variable.
             symbolizer_search_paths = os.environ.get('PATH', '')
@@ -988,6 +609,8 @@ class Configuration(object):
                 self.cxx.flags += ['-fsanitize=thread']
                 self.config.available_features.add('tsan')
                 self.config.available_features.add('sanitizer-new-delete')
+            elif san == 'DataFlow':
+                self.cxx.flags += ['-fsanitize=dataflow']
             else:
                 self.lit_config.fatal('unsupported value for '
                                       'use_sanitizer: {0}'.format(san))
@@ -1002,29 +625,16 @@ class Configuration(object):
             self.cxx.flags += ['-g', '--coverage']
             self.cxx.compile_flags += ['-O0']
 
-    def configure_coroutines(self):
-        if self.cxx.hasCompileFlag('-fcoroutines-ts'):
-            macros = self._dump_macros_verbose(flags=['-fcoroutines-ts'])
-            if '__cpp_coroutines' not in macros:
-                self.lit_config.warning('-fcoroutines-ts is supported but '
-                    '__cpp_coroutines is not defined')
-            # Consider coroutines supported only when the feature test macro
-            # reflects a recent value.
-            if intMacroValue(macros['__cpp_coroutines']) >= 201703:
-                self.config.available_features.add('fcoroutines-ts')
-
     def configure_modules(self):
-        modules_flags = ['-fmodules']
-        if not self.target_info.is_darwin():
-            modules_flags += ['-Xclang', '-fmodules-local-submodule-visibility']
+        modules_flags = ['-fmodules', '-Xclang', '-fmodules-local-submodule-visibility']
         supports_modules = self.cxx.hasCompileFlag(modules_flags)
-        enable_modules = self.get_modules_enabled()
+        enable_modules = self.get_lit_bool('enable_modules', default=False,
+                                                             env_var='LIBCXX_ENABLE_MODULES')
         if enable_modules and not supports_modules:
             self.lit_config.fatal(
                 '-fmodules is enabled but not supported by the compiler')
         if not supports_modules:
             return
-        self.config.available_features.add('modules-support')
         module_cache = os.path.join(self.config.test_exec_root,
                                    'modules.cache')
         module_cache = os.path.realpath(module_cache)
@@ -1038,59 +648,24 @@ class Configuration(object):
             self.cxx.useModules()
 
     def configure_substitutions(self):
-        tool_env = ''
-        if self.target_info.is_darwin():
-            # Do not pass DYLD_LIBRARY_PATH to the compiler, linker, etc. as
-            # these tools are not meant to exercise the just-built libraries.
-            tool_env += 'DYLD_LIBRARY_PATH="" '
-
         sub = self.config.substitutions
-        cxx_path = tool_env + pipes.quote(self.cxx.path)
-        # Configure compiler substitutions
-        sub.append(('%cxx', cxx_path))
-        sub.append(('%libcxx_src_root', self.libcxx_src_root))
-        # Configure flags substitutions
-        flags_str = ' '.join([pipes.quote(f) for f in self.cxx.flags])
-        compile_flags_str = ' '.join([pipes.quote(f) for f in self.cxx.compile_flags])
-        link_flags_str = ' '.join([pipes.quote(f) for f in self.cxx.link_flags])
-        all_flags = '%s %s %s' % (flags_str, compile_flags_str, link_flags_str)
-        sub.append(('%flags', flags_str))
-        sub.append(('%compile_flags', compile_flags_str))
-        sub.append(('%link_flags', link_flags_str))
-        sub.append(('%all_flags', all_flags))
-        if self.cxx.isVerifySupported():
-            verify_str = ' ' + ' '.join(self.cxx.verify_flags) + ' '
-            sub.append(('%verify', verify_str))
-        # Add compile and link shortcuts
-        compile_str = (cxx_path + ' -o %t.o %s -c ' + flags_str
-                       + ' ' + compile_flags_str)
-        link_str = (cxx_path + ' -o %t.exe %t.o ' + flags_str + ' '
-                    + link_flags_str)
-        assert type(link_str) is str
-        build_str = cxx_path + ' -o %t.exe %s ' + all_flags
-        if self.cxx.use_modules:
-            sub.append(('%compile_module', compile_str))
-            sub.append(('%build_module', build_str))
-        elif self.cxx.modules_flags is not None:
-            modules_str = ' '.join(self.cxx.modules_flags) + ' '
-            sub.append(('%compile_module', compile_str + ' ' + modules_str))
-            sub.append(('%build_module', build_str + ' ' + modules_str))
-        sub.append(('%compile', compile_str))
-        sub.append(('%link', link_str))
-        sub.append(('%build', build_str))
-        # Configure exec prefix substitutions.
-        # Configure run env substitution.
+        sub.append(('%{cxx}', pipes.quote(self.cxx.path)))
+        flags = self.cxx.flags + (self.cxx.modules_flags if self.cxx.use_modules else [])
+        compile_flags = self.cxx.compile_flags + (self.cxx.warning_flags if self.cxx.use_warnings else [])
+        sub.append(('%{flags}',         ' '.join(map(pipes.quote, flags))))
+        sub.append(('%{compile_flags}', ' '.join(map(pipes.quote, compile_flags))))
+        sub.append(('%{link_flags}',    ' '.join(map(pipes.quote, self.cxx.link_flags))))
+        sub.append(('%{link_libcxxabi}', pipes.quote(self.cxx.link_libcxxabi_flag)))
         codesign_ident = self.get_lit_conf('llvm_codesign_identity', '')
-        run_py = os.path.join(self.libcxx_src_root, 'utils', 'run.py')
-        run_str = '%s %s "%s" %%t.exe' % (pipes.quote(sys.executable), \
-                                          pipes.quote(run_py), codesign_ident)
-        sub.append(('%run', run_str))
-        # Configure not program substitutions
-        not_py = os.path.join(self.libcxx_src_root, 'utils', 'not.py')
-        not_str = '%s %s ' % (pipes.quote(sys.executable), pipes.quote(not_py))
-        sub.append(('not ', not_str))
+        env_vars = ' '.join('%s=%s' % (k, pipes.quote(v)) for (k, v) in self.exec_env.items())
+        exec_args = [
+            '--execdir %T',
+            '--codesign_identity "{}"'.format(codesign_ident),
+            '--env {}'.format(env_vars)
+        ]
+        sub.append(('%{exec}', '{} {} -- '.format(self.executor, ' '.join(exec_args))))
         if self.get_lit_conf('libcxx_gdb'):
-            sub.append(('%libcxx_gdb', self.get_lit_conf('libcxx_gdb')))
+            sub.append(('%{libcxx_gdb}', self.get_lit_conf('libcxx_gdb')))
 
     def can_use_deployment(self):
         # Check if the host is on an Apple platform using clang.
@@ -1180,12 +755,12 @@ class Configuration(object):
         # which is not relevant for non-shipped flavors of libc++.
         if self.use_system_cxx_lib:
             # Dylib support for shared_mutex was added in macosx10.12.
-            if name == 'macosx' and version in ('10.%s' % v for v in range(7, 12)):
+            if name == 'macosx' and version in ('10.%s' % v for v in range(9, 12)):
                 self.config.available_features.add('dylib-has-no-shared_mutex')
                 self.lit_config.note("shared_mutex is not supported by the deployment target")
             # Throwing bad_optional_access, bad_variant_access and bad_any_cast is
-            # supported starting in macosx10.14.
-            if name == 'macosx' and version in ('10.%s' % v for v in range(7, 14)):
+            # supported starting in macosx10.13.
+            if name == 'macosx' and version in ('10.%s' % v for v in range(9, 13)):
                 self.config.available_features.add('dylib-has-no-bad_optional_access')
                 self.lit_config.note("throwing bad_optional_access is not supported by the deployment target")
 
@@ -1194,15 +769,11 @@ class Configuration(object):
 
                 self.config.available_features.add('dylib-has-no-bad_any_cast')
                 self.lit_config.note("throwing bad_any_cast is not supported by the deployment target")
-            # Filesystem is support on Apple platforms starting with macosx10.15.
-            if name == 'macosx' and version in ('10.%s' % v for v in range(7, 15)):
-                self.config.available_features.add('dylib-has-no-filesystem')
-                self.lit_config.note("the deployment target does not support <filesystem>")
         else:
-            self.cxx.flags += ['-D_LIBCPP_DISABLE_AVAILABILITY']
+            self.cxx.compile_flags += ['-D_LIBCPP_DISABLE_AVAILABILITY']
 
     def configure_env(self):
-        self.target_info.configure_env(self.exec_env)
+        self.config.environment = dict(os.environ)
 
     def add_path(self, dest_env, new_path):
         self.target_info.add_path(dest_env, new_path)
diff --git a/gnu/llvm/libcxx/utils/libcxx/test/dsl.py b/gnu/llvm/libcxx/utils/libcxx/test/dsl.py
new file mode 100644
index 00000000000..e0e09e6bcac
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/libcxx/test/dsl.py
@@ -0,0 +1,379 @@
+#===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===----------------------------------------------------------------------===##
+
+import libcxx.test.format
+import lit
+import lit.util
+import os
+import pipes
+import platform
+import re
+import tempfile
+
+def _memoize(f):
+  cache = dict()
+  def memoized(x):
+    if x not in cache:
+      cache[x] = f(x)
+    return cache[x]
+  return memoized
+
+def _executeScriptInternal(test, commands):
+  """
+  Returns (stdout, stderr, exitCode, timeoutInfo)
+
+  TODO: This really should be easier to access from Lit itself
+  """
+  parsedCommands = libcxx.test.format.parseScript(test, preamble=commands)
+
+  litConfig = lit.LitConfig.LitConfig(
+    progname='lit',
+    path=[],
+    quiet=False,
+    useValgrind=False,
+    valgrindLeakCheck=False,
+    valgrindArgs=[],
+    noExecute=False,
+    debug=False,
+    isWindows=platform.system() == 'Windows',
+    params={})
+  _, tmpBase = libcxx.test.format._getTempPaths(test)
+  execDir = os.path.dirname(test.getExecPath())
+  for d in (execDir, os.path.dirname(tmpBase)):
+    if not os.path.exists(d):
+      os.makedirs(d)
+  res = lit.TestRunner.executeScriptInternal(test, litConfig, tmpBase, parsedCommands, execDir)
+  if isinstance(res, lit.Test.Result):
+    res = ('', '', 127, None)
+  return res
+
+def _makeConfigTest(config):
+  sourceRoot = os.path.join(config.test_exec_root, '__config_src__')
+  execRoot = os.path.join(config.test_exec_root, '__config_exec__')
+  suite = lit.Test.TestSuite('__config__', sourceRoot, execRoot, config)
+  if not os.path.exists(sourceRoot):
+    os.makedirs(sourceRoot)
+  tmp = tempfile.NamedTemporaryFile(dir=sourceRoot, delete=False, suffix='.cpp')
+  tmp.close()
+  pathInSuite = [os.path.relpath(tmp.name, sourceRoot)]
+  class TestWrapper(lit.Test.Test):
+    def __enter__(self):       return self
+    def __exit__(self, *args): os.remove(tmp.name)
+  return TestWrapper(suite, pathInSuite, config)
+
+def sourceBuilds(config, source):
+  """
+  Return whether the program in the given string builds successfully.
+
+  This is done by compiling and linking a program that consists of the given
+  source with the %{cxx} substitution, and seeing whether that succeeds.
+  """
+  with _makeConfigTest(config) as test:
+    with open(test.getSourcePath(), 'w') as sourceFile:
+      sourceFile.write(source)
+    out, err, exitCode, timeoutInfo = _executeScriptInternal(test, [
+      "%{cxx} %s %{flags} %{compile_flags} %{link_flags} -o %t.exe"
+    ])
+    _executeScriptInternal(test, ['rm %t.exe'])
+    return exitCode == 0
+
+def programOutput(config, program, args=[]):
+  """
+  Compiles a program for the test target, run it on the test target and return
+  the output.
+
+  If the program fails to compile or run, None is returned instead. Note that
+  execution of the program is done through the %{exec} substitution, which means
+  that the program may be run on a remote host depending on what %{exec} does.
+  """
+  with _makeConfigTest(config) as test:
+    with open(test.getSourcePath(), 'w') as source:
+      source.write(program)
+    try:
+      _, _, exitCode, _ = _executeScriptInternal(test, [
+        "%{cxx} %s %{flags} %{compile_flags} %{link_flags} -o %t.exe",
+      ])
+      if exitCode != 0:
+        return None
+
+      out, err, exitCode, _ = _executeScriptInternal(test, [
+        "%{{exec}} %t.exe {}".format(' '.join(args))
+      ])
+      if exitCode != 0:
+        return None
+
+      actualOut = re.search("command output:\n(.+)\n$", out, flags=re.DOTALL)
+      actualOut = actualOut.group(1) if actualOut else ""
+      return actualOut
+
+    finally:
+      _executeScriptInternal(test, ['rm %t.exe'])
+
+def hasCompileFlag(config, flag):
+  """
+  Return whether the compiler in the configuration supports a given compiler flag.
+
+  This is done by executing the %{cxx} substitution with the given flag and
+  checking whether that succeeds.
+  """
+  with _makeConfigTest(config) as test:
+    out, err, exitCode, timeoutInfo = _executeScriptInternal(test, [
+      "%{{cxx}} -xc++ {} -Werror -fsyntax-only %{{flags}} %{{compile_flags}} {}".format(os.devnull, flag)
+    ])
+    return exitCode == 0
+
+def hasLocale(config, locale):
+  """
+  Return whether the runtime execution environment supports a given locale.
+
+  This is done by executing a program that tries to set the given locale using
+  %{exec} -- this means that the command may be executed on a remote host
+  depending on the %{exec} substitution.
+  """
+  program = """
+    #include <locale.h>
+    int main(int, char** argv) {
+      if (::setlocale(LC_ALL, argv[1]) != NULL) return 0;
+      else                                      return 1;
+    }
+  """
+  return programOutput(config, program, args=[pipes.quote(locale)]) != None
+
+def compilerMacros(config, flags=''):
+  """
+  Return a dictionary of predefined compiler macros.
+
+  The keys are strings representing macros, and the values are strings
+  representing what each macro is defined to.
+
+  If the optional `flags` argument (a string) is provided, these flags will
+  be added to the compiler invocation when generating the macros.
+  """
+  with _makeConfigTest(config) as test:
+    unparsedOutput, err, exitCode, timeoutInfo = _executeScriptInternal(test, [
+      "%{{cxx}} -xc++ {} -dM -E %{{flags}} %{{compile_flags}} {}".format(os.devnull, flags)
+    ])
+    parsedMacros = dict()
+    defines = (l.strip() for l in unparsedOutput.split('\n') if l.startswith('#define '))
+    for line in defines:
+      line = line[len('#define '):]
+      macro, _, value = line.partition(' ')
+      parsedMacros[macro] = value
+    return parsedMacros
+
+def featureTestMacros(config, flags=''):
+  """
+  Return a dictionary of feature test macros.
+
+  The keys are strings representing feature test macros, and the values are
+  integers representing the value of the macro.
+  """
+  allMacros = compilerMacros(config, flags)
+  return {m: int(v.rstrip('LlUu')) for (m, v) in allMacros.items() if m.startswith('__cpp_')}
+
+
+class Feature(object):
+  """
+  Represents a Lit available feature that is enabled whenever it is supported.
+
+  A feature like this informs the test suite about a capability of the compiler,
+  platform, etc. Unlike Parameters, it does not make sense to explicitly
+  control whether a Feature is enabled -- it should be enabled whenever it
+  is supported.
+  """
+  def __init__(self, name, compileFlag=None, linkFlag=None, when=lambda _: True):
+    """
+    Create a Lit feature for consumption by a test suite.
+
+    - name
+        The name of the feature. This is what will end up in Lit's available
+        features if the feature is enabled. This can be either a string or a
+        callable, in which case it is passed the TestingConfig and should
+        generate a string representing the name of the feature.
+
+    - compileFlag
+        An optional compile flag to add when this feature is added to a
+        TestingConfig. If provided, this must be a string representing a
+        compile flag that will be appended to the end of the %{compile_flags}
+        substitution of the TestingConfig.
+
+    - linkFlag
+        An optional link flag to add when this feature is added to a
+        TestingConfig. If provided, this must be a string representing a
+        link flag that will be appended to the end of the %{link_flags}
+        substitution of the TestingConfig.
+
+    - when
+        A callable that gets passed a TestingConfig and should return a
+        boolean representing whether the feature is supported in that
+        configuration. For example, this can use `hasCompileFlag` to
+        check whether the compiler supports the flag that the feature
+        represents. If omitted, the feature will always be considered
+        supported.
+    """
+    self._name = name
+    self._compileFlag = compileFlag
+    self._linkFlag = linkFlag
+    self._isSupported = when
+
+  def isSupported(self, config):
+    """
+    Return whether the feature is supported by the given TestingConfig.
+    """
+    return self._isSupported(config)
+
+  def enableIn(self, config):
+    """
+    Enable a feature in a TestingConfig.
+
+    The name of the feature is added to the set of available features of
+    `config`, and any compile or link flags provided upon construction of
+    the Feature are added to the end of the corresponding substitution in
+    the config.
+
+    It is an error to call `f.enableIn(cfg)` if the feature `f` is not
+    supported in that TestingConfig (i.e. if `not f.isSupported(cfg)`).
+    """
+    assert self.isSupported(config), \
+      "Trying to enable feature {} that is not supported in the given configuration".format(self._name)
+
+    addTo = lambda subs, sub, flag: [(s, x + ' ' + flag) if s == sub else (s, x) for (s, x) in subs]
+    if self._compileFlag:
+      compileFlag = self._compileFlag(config) if callable(self._compileFlag) else self._compileFlag
+      config.substitutions = addTo(config.substitutions, '%{compile_flags}', compileFlag)
+    if self._linkFlag:
+      linkFlag = self._linkFlag(config) if callable(self._linkFlag) else self._linkFlag
+      config.substitutions = addTo(config.substitutions, '%{link_flags}', linkFlag)
+
+    name = self._name(config) if callable(self._name) else self._name
+    if not isinstance(name, str):
+      raise ValueError("Feature did not resolve to a name that's a string, got {}".format(name))
+    config.available_features.add(name)
+
+
+def _str_to_bool(s):
+  """
+  Convert a string value to a boolean.
+
+  True values are "y", "yes", "t", "true", "on" and "1", regardless of capitalization.
+  False values are "n", "no", "f", "false", "off" and "0", regardless of capitalization.
+  """
+  trueVals = ["y", "yes", "t", "true", "on", "1"]
+  falseVals = ["n", "no", "f", "false", "off", "0"]
+  lower = s.lower()
+  if lower in trueVals:
+    return True
+  elif lower in falseVals:
+    return False
+  else:
+    raise ValueError("Got string '{}', which isn't a valid boolean".format(s))
+
+
+class Parameter(object):
+  """
+  Represents a parameter of a Lit test suite.
+
+  Parameters are used to customize the behavior of test suites in a user
+  controllable way. There are two ways of setting the value of a Parameter.
+  The first one is to pass `--param <KEY>=<VALUE>` when running Lit (or
+  equivalenlty to set `litConfig.params[KEY] = VALUE` somewhere in the
+  Lit configuration files. This method will set the parameter globally for
+  all test suites being run.
+
+  The second method is to set `config.KEY = VALUE` somewhere in the Lit
+  configuration files, which sets the parameter only for the test suite(s)
+  that use that `config` object.
+
+  Parameters can have multiple possible values, and they can have a default
+  value when left unspecified. They can also have a Feature associated to them,
+  in which case the Feature is added to the TestingConfig if the parameter is
+  enabled. It is an error if the Parameter is enabled but the Feature associated
+  to it is not supported, for example trying to set the compilation standard to
+  C++17 when `-std=c++17` is not supported by the compiler.
+
+  One important point is that Parameters customize the behavior of the test
+  suite in a bounded way, i.e. there should be a finite set of possible choices
+  for `<VALUE>`. While this may appear to be an aggressive restriction, this
+  is actually a very important constraint that ensures that the set of
+  configurations supported by a test suite is finite. Otherwise, a test
+  suite could have an unbounded number of supported configurations, and
+  nobody wants to be stuck maintaining that. If it's not possible for an
+  option to have a finite set of possible values (e.g. the path to the
+  compiler), it can be handled in the `lit.cfg`, but it shouldn't be
+  represented with a Parameter.
+  """
+  def __init__(self, name, choices, type, help, feature, default=None):
+    """
+    Create a Lit parameter to customize the behavior of a test suite.
+
+    - name
+        The name of the parameter that can be used to set it on the command-line.
+        On the command-line, the parameter can be set using `--param <name>=<value>`
+        when running Lit. This must be non-empty.
+
+    - choices
+        A non-empty set of possible values for this parameter. This must be
+        anything that can be iterated. It is an error if the parameter is
+        given a value that is not in that set, whether explicitly or through
+        a default value.
+
+    - type
+        A callable that can be used to parse the value of the parameter given
+        on the command-line. As a special case, using the type `bool` also
+        allows parsing strings with boolean-like contents.
+
+    - help
+        A string explaining the parameter, for documentation purposes.
+        TODO: We should be able to surface those from the Lit command-line.
+
+    - feature
+        A callable that gets passed the parsed value of the parameter (either
+        the one passed on the command-line or the default one), and that returns
+        either None or a Feature.
+
+    - default
+        An optional default value to use for the parameter when no value is
+        provided on the command-line. If the default value is a callable, it
+        is called with the TestingConfig and should return the default value
+        for the parameter. Whether the default value is computed or specified
+        directly, it must be in the 'choices' provided for that Parameter.
+    """
+    self._name = name
+    if len(self._name) == 0:
+      raise ValueError("Parameter name must not be the empty string")
+
+    self._choices = list(choices) # should be finite
+    if len(self._choices) == 0:
+      raise ValueError("Parameter '{}' must be given at least one possible value".format(self._name))
+
+    self._parse = lambda x: (_str_to_bool(x) if type is bool and isinstance(x, str)
+                                             else type(x))
+    self._help = help
+    self._feature = feature
+    self._default = default
+
+  @property
+  def name(self):
+    """
+    Return the name of the parameter.
+
+    This is the name that can be used to set the parameter on the command-line
+    when running Lit.
+    """
+    return self._name
+
+  def getFeature(self, config, litParams):
+    param = getattr(config, self.name, None)
+    param = litParams.get(self.name, param)
+    if param is None and self._default is None:
+      raise ValueError("Parameter {} doesn't have a default value, but it was not specified in the Lit parameters or in the Lit config".format(self.name))
+    getDefault = lambda: self._default(config) if callable(self._default) else self._default
+    value = self._parse(param) if param is not None else getDefault()
+    if value not in self._choices:
+      raise ValueError("Got value '{}' for parameter '{}', which is not in the provided set of possible choices: {}".format(value, self.name, self._choices))
+    return self._feature(value)
diff --git a/gnu/llvm/libcxx/utils/libcxx/test/features.py b/gnu/llvm/libcxx/utils/libcxx/test/features.py
new file mode 100644
index 00000000000..f3d8e782be8
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/libcxx/test/features.py
@@ -0,0 +1,119 @@
+#===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===----------------------------------------------------------------------===##
+
+from libcxx.test.dsl import *
+import sys
+
+_isClang      = lambda cfg: '__clang__' in compilerMacros(cfg) and '__apple_build_version__' not in compilerMacros(cfg)
+_isAppleClang = lambda cfg: '__apple_build_version__' in compilerMacros(cfg)
+_isGCC        = lambda cfg: '__GNUC__' in compilerMacros(cfg) and '__clang__' not in compilerMacros(cfg)
+
+features = [
+  Feature(name='fcoroutines-ts', compileFlag='-fcoroutines-ts',
+          when=lambda cfg: hasCompileFlag(cfg, '-fcoroutines-ts') and
+                           featureTestMacros(cfg, flags='-fcoroutines-ts').get('__cpp_coroutines', 0) >= 201703),
+
+  Feature(name='thread-safety',                 when=lambda cfg: hasCompileFlag(cfg, '-Werror=thread-safety'), compileFlag='-Werror=thread-safety'),
+  Feature(name='has-fblocks',                   when=lambda cfg: hasCompileFlag(cfg, '-fblocks')),
+  Feature(name='-fsized-deallocation',          when=lambda cfg: hasCompileFlag(cfg, '-fsized-deallocation')),
+  Feature(name='-faligned-allocation',          when=lambda cfg: hasCompileFlag(cfg, '-faligned-allocation')),
+  Feature(name='fdelayed-template-parsing',     when=lambda cfg: hasCompileFlag(cfg, '-fdelayed-template-parsing')),
+  Feature(name='libcpp-no-if-constexpr',        when=lambda cfg: '__cpp_if_constexpr' not in featureTestMacros(cfg)),
+  Feature(name='libcpp-no-structured-bindings', when=lambda cfg: '__cpp_structured_bindings' not in featureTestMacros(cfg)),
+  Feature(name='libcpp-no-deduction-guides',    when=lambda cfg: featureTestMacros(cfg).get('__cpp_deduction_guides', 0) < 201611),
+  Feature(name='libcpp-no-concepts',            when=lambda cfg: featureTestMacros(cfg).get('__cpp_concepts', 0) < 201811),
+  Feature(name='has-fobjc-arc',                 when=lambda cfg: hasCompileFlag(cfg, '-xobjective-c++ -fobjc-arc') and
+                                                                 sys.platform.lower().strip() == 'darwin'), # TODO: this doesn't handle cross-compiling to Apple platforms.
+  Feature(name='objective-c++',                 when=lambda cfg: hasCompileFlag(cfg, '-xobjective-c++ -fobjc-arc')),
+  Feature(name='diagnose-if-support',           when=lambda cfg: hasCompileFlag(cfg, '-Wuser-defined-warnings'), compileFlag='-Wuser-defined-warnings'),
+  Feature(name='modules-support',               when=lambda cfg: hasCompileFlag(cfg, '-fmodules')),
+  Feature(name='non-lockfree-atomics',          when=lambda cfg: sourceBuilds(cfg, """
+                                                                  #include <atomic>
+                                                                  struct Large { int storage[100]; };
+                                                                  std::atomic<Large> x;
+                                                                  int main(int, char**) { return x.load(), x.is_lock_free(); }
+                                                                """)),
+
+  Feature(name='apple-clang',                                                                                                      when=_isAppleClang),
+  Feature(name=lambda cfg: 'apple-clang-{__clang_major__}'.format(**compilerMacros(cfg)),                                          when=_isAppleClang),
+  Feature(name=lambda cfg: 'apple-clang-{__clang_major__}.{__clang_minor__}'.format(**compilerMacros(cfg)),                        when=_isAppleClang),
+  Feature(name=lambda cfg: 'apple-clang-{__clang_major__}.{__clang_minor__}.{__clang_patchlevel__}'.format(**compilerMacros(cfg)), when=_isAppleClang),
+
+  Feature(name='clang',                                                                                                            when=_isClang),
+  Feature(name=lambda cfg: 'clang-{__clang_major__}'.format(**compilerMacros(cfg)),                                                when=_isClang),
+  Feature(name=lambda cfg: 'clang-{__clang_major__}.{__clang_minor__}'.format(**compilerMacros(cfg)),                              when=_isClang),
+  Feature(name=lambda cfg: 'clang-{__clang_major__}.{__clang_minor__}.{__clang_patchlevel__}'.format(**compilerMacros(cfg)),       when=_isClang),
+
+  Feature(name='gcc',                                                                                                              when=_isGCC),
+  Feature(name=lambda cfg: 'gcc-{__GNUC__}'.format(**compilerMacros(cfg)),                                                         when=_isGCC),
+  Feature(name=lambda cfg: 'gcc-{__GNUC__}.{__GNUC_MINOR__}'.format(**compilerMacros(cfg)),                                        when=_isGCC),
+  Feature(name=lambda cfg: 'gcc-{__GNUC__}.{__GNUC_MINOR__}.{__GNUC_PATCHLEVEL__}'.format(**compilerMacros(cfg)),                  when=_isGCC),
+]
+
+# Deduce and add the test features that that are implied by the #defines in
+# the <__config_site> header.
+#
+# For each macro of the form `_LIBCPP_XXX_YYY_ZZZ` defined below that
+# is defined after including <__config_site>, add a Lit feature called
+# `libcpp-xxx-yyy-zzz`. When a macro is defined to a specific value
+# (e.g. `_LIBCPP_ABI_VERSION=2`), the feature is `libcpp-xxx-yyy-zzz=<value>`.
+macros = {
+  '_LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE': 'libcpp-has-no-global-filesystem-namespace',
+  '_LIBCPP_HAS_NO_MONOTONIC_CLOCK': 'libcpp-has-no-monotonic-clock',
+  '_LIBCPP_HAS_NO_STDIN': 'libcpp-has-no-stdin',
+  '_LIBCPP_HAS_NO_STDOUT': 'libcpp-has-no-stdout',
+  '_LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS': 'libcpp-has-no-thread-unsafe-c-functions',
+  '_LIBCPP_HAS_NO_THREADS': 'libcpp-has-no-threads',
+  '_LIBCPP_HAS_THREAD_API_EXTERNAL': 'libcpp-has-thread-api-external',
+  '_LIBCPP_HAS_THREAD_API_PTHREAD': 'libcpp-has-thread-api-pthread',
+  '_LIBCPP_NO_VCRUNTIME': 'libcpp-no-vcruntime',
+  '_LIBCPP_ABI_VERSION': 'libcpp-abi-version',
+  '_LIBCPP_ABI_UNSTABLE': 'libcpp-abi-unstable'
+}
+for macro, feature in macros.items():
+  features += [
+    Feature(name=lambda cfg, m=macro, f=feature: f + (
+              '={}'.format(compilerMacros(cfg)[m]) if compilerMacros(cfg)[m] else ''
+            ),
+            when=lambda cfg, m=macro: m in compilerMacros(cfg),
+
+            # FIXME: This is a hack that should be fixed using module maps.
+            # If modules are enabled then we have to lift all of the definitions
+            # in <__config_site> onto the command line.
+            compileFlag=lambda cfg, m=macro: '-Wno-macro-redefined -D{}'.format(m) + (
+              '={}'.format(compilerMacros(cfg)[m]) if compilerMacros(cfg)[m] else ''
+            )
+    )
+  ]
+
+
+# Mapping from canonical locale names (used in the tests) to possible locale
+# names on various systems. Each locale is considered supported if any of the
+# alternative names is supported.
+locales = {
+  'en_US.UTF-8':     ['en_US.UTF-8', 'en_US.utf8', 'English_United States.1252'],
+  'fr_FR.UTF-8':     ['fr_FR.UTF-8', 'fr_FR.utf8', 'French_France.1252'],
+  'ru_RU.UTF-8':     ['ru_RU.UTF-8', 'ru_RU.utf8', 'Russian_Russia.1251'],
+  'zh_CN.UTF-8':     ['zh_CN.UTF-8', 'zh_CN.utf8', 'Chinese_China.936'],
+  'fr_CA.ISO8859-1': ['fr_CA.ISO8859-1', 'French_Canada.1252'],
+  'cs_CZ.ISO8859-2': ['cs_CZ.ISO8859-2', 'Czech_Czech Republic.1250']
+}
+for locale, alts in locales.items():
+  features += [
+    Feature(name='locale.{}'.format(locale),
+            when=lambda cfg: any(hasLocale(cfg, alt) for alt in alts))
+  ]
+
+
+# Add features representing the platform name: darwin, linux, windows, etc...
+features += [
+  Feature(name='darwin', when=lambda cfg: '__APPLE__' in compilerMacros(cfg)),
+  Feature(name='windows', when=lambda cfg: '_WIN32' in compilerMacros(cfg)),
+  Feature(name='linux', when=lambda cfg: '__linux__' in compilerMacros(cfg)),
+  Feature(name='netbsd', when=lambda cfg: '__NetBSD__' in compilerMacros(cfg))
+]
diff --git a/gnu/llvm/libcxx/utils/libcxx/test/format.py b/gnu/llvm/libcxx/utils/libcxx/test/format.py
index 55f179a20e1..4390166ca6b 100644
--- a/gnu/llvm/libcxx/utils/libcxx/test/format.py
+++ b/gnu/llvm/libcxx/utils/libcxx/test/format.py
@@ -6,260 +6,311 @@
 #
 #===----------------------------------------------------------------------===##
 
-import copy
-import errno
+import lit
+import lit.formats
 import os
-import time
-import random
+import pipes
+import re
+import shutil
+import subprocess
 
-import lit.Test        # pylint: disable=import-error
-import lit.TestRunner  # pylint: disable=import-error
-from lit.TestRunner import ParserKind, IntegratedTestKeywordParser  \
-    # pylint: disable=import-error
+def _supportsVerify(config):
+    """
+    Determine whether clang-verify is supported by the given configuration.
 
-from libcxx.test.executor import LocalExecutor as LocalExecutor
-import libcxx.util
+    This is done by checking whether the %{cxx} substitution in that
+    configuration supports certain compiler flags.
+    """
+    command = "%{{cxx}} -xc++ {} -Werror -fsyntax-only -Xclang -verify-ignore-unexpected".format(os.devnull)
+    command = lit.TestRunner.applySubstitutions([command], config.substitutions,
+                                                recursion_limit=config.recursiveExpansionLimit)[0]
+    devNull = open(os.devnull, 'w')
+    result = subprocess.call(command, shell=True, stdout=devNull, stderr=devNull)
+    return result == 0
 
+def _getTempPaths(test):
+    """
+    Return the values to use for the %T and %t substitutions, respectively.
 
-class LibcxxTestFormat(object):
+    The difference between this and Lit's default behavior is that we guarantee
+    that %T is a path unique to the test being run.
     """
-    Custom test format handler for use with the test format use by libc++.
+    tmpDir, _ = lit.TestRunner.getTempPaths(test)
+    _, testName = os.path.split(test.getExecPath())
+    tmpDir = os.path.join(tmpDir, testName + '.dir')
+    tmpBase = os.path.join(tmpDir, 't')
+    return tmpDir, tmpBase
+
+def parseScript(test, preamble):
+    """
+    Extract the script from a test, with substitutions applied.
+
+    Returns a list of commands ready to be executed.
+
+    - test
+        The lit.Test to parse.
 
-    Tests fall into two categories:
-      FOO.pass.cpp - Executable test which should compile, run, and exit with
-                     code 0.
-      FOO.fail.cpp - Negative test case which is expected to fail compilation.
-      FOO.sh.cpp   - A test that uses LIT's ShTest format.
+    - preamble
+        A list of commands to perform before any command in the test.
+        These commands can contain unexpanded substitutions, but they
+        must not be of the form 'RUN:' -- they must be proper commands
+        once substituted.
     """
 
-    def __init__(self, cxx, use_verify_for_fail, execute_external,
-                 executor, exec_env):
-        self.cxx = copy.deepcopy(cxx)
-        self.use_verify_for_fail = use_verify_for_fail
-        self.execute_external = execute_external
-        self.executor = executor
-        self.exec_env = dict(exec_env)
-
-    @staticmethod
-    def _make_custom_parsers():
-        return [
-            IntegratedTestKeywordParser('FLAKY_TEST.', ParserKind.TAG,
-                                        initial_value=False),
-            IntegratedTestKeywordParser('MODULES_DEFINES:', ParserKind.LIST,
-                                        initial_value=[])
-        ]
-
-    @staticmethod
-    def _get_parser(key, parsers):
-        for p in parsers:
-            if p.keyword == key:
-                return p
-        assert False and "parser not found"
-
-    # TODO: Move this into lit's FileBasedTest
-    def getTestsInDirectory(self, testSuite, path_in_suite,
-                            litConfig, localConfig):
-        source_path = testSuite.getSourcePath(path_in_suite)
-        for filename in os.listdir(source_path):
+    # Get the default substitutions
+    tmpDir, tmpBase = _getTempPaths(test)
+    useExternalSh = True
+    substitutions = lit.TestRunner.getDefaultSubstitutions(test, tmpDir, tmpBase,
+                                                           normalize_slashes=useExternalSh)
+
+    # Add the %{build} and %{run} convenience substitutions
+    substitutions.append(('%{build}', '%{cxx} %s %{flags} %{compile_flags} %{link_flags} -o %t.exe'))
+    substitutions.append(('%{run}', '%{exec} %t.exe'))
+
+    # Parse the test file, including custom directives
+    additionalCompileFlags = []
+    fileDependencies = []
+    parsers = [
+        lit.TestRunner.IntegratedTestKeywordParser('FILE_DEPENDENCIES:',
+                                                   lit.TestRunner.ParserKind.LIST,
+                                                   initial_value=fileDependencies),
+        lit.TestRunner.IntegratedTestKeywordParser('ADDITIONAL_COMPILE_FLAGS:',
+                                                   lit.TestRunner.ParserKind.LIST,
+                                                   initial_value=additionalCompileFlags)
+    ]
+
+    scriptInTest = lit.TestRunner.parseIntegratedTestScript(test, additional_parsers=parsers,
+                                                            require_script=not preamble)
+    if isinstance(scriptInTest, lit.Test.Result):
+        return scriptInTest
+
+    script = []
+
+    # For each file dependency in FILE_DEPENDENCIES, inject a command to copy
+    # that file to the execution directory. Execute the copy from %S to allow
+    # relative paths from the test directory.
+    for dep in fileDependencies:
+        script += ['%dbg(SETUP) cd %S && cp {} %T'.format(dep)]
+    script += preamble
+    script += scriptInTest
+
+    # Add compile flags specified with ADDITIONAL_COMPILE_FLAGS.
+    substitutions = [(s, x + ' ' + ' '.join(additionalCompileFlags)) if s == '%{compile_flags}'
+                            else (s, x) for (s, x) in substitutions]
+
+    # Perform substitutions in the script itself.
+    script = lit.TestRunner.applySubstitutions(script, substitutions,
+                                               recursion_limit=test.config.recursiveExpansionLimit)
+
+    return script
+
+
+class CxxStandardLibraryTest(lit.formats.TestFormat):
+    """
+    Lit test format for the C++ Standard Library conformance test suite.
+
+    This test format is based on top of the ShTest format -- it basically
+    creates a shell script performing the right operations (compile/link/run)
+    based on the extension of the test file it encounters. It supports files
+    with the following extensions:
+
+    FOO.pass.cpp            - Compiles, links and runs successfully
+    FOO.pass.mm             - Same as .pass.cpp, but for Objective-C++
+    FOO.run.fail.cpp        - Compiles and links successfully, but fails at runtime
+
+    FOO.compile.pass.cpp    - Compiles successfully, link and run not attempted
+    FOO.compile.fail.cpp    - Does not compile successfully
+
+    FOO.link.pass.cpp       - Compiles and links successfully, run not attempted
+    FOO.link.fail.cpp       - Compiles successfully, but fails to link
+
+    FOO.sh.<anything>       - A builtin Lit Shell test
+
+    FOO.verify.cpp          - Compiles with clang-verify. This type of test is
+                              automatically marked as UNSUPPORTED if the compiler
+                              does not support Clang-verify.
+
+    FOO.fail.cpp            - Compiled with clang-verify if clang-verify is
+                              supported, and equivalent to a .compile.fail.cpp
+                              test otherwise. This is supported only for backwards
+                              compatibility with the test suite.
+
+
+    Substitution requirements
+    ===============================
+    The test format operates by assuming that each test's configuration provides
+    the following substitutions, which it will reuse in the shell scripts it
+    constructs:
+        %{cxx}           - A command that can be used to invoke the compiler
+        %{compile_flags} - Flags to use when compiling a test case
+        %{link_flags}    - Flags to use when linking a test case
+        %{flags}         - Flags to use either when compiling or linking a test case
+        %{exec}          - A command to prefix the execution of executables
+
+    Note that when building an executable (as opposed to only compiling a source
+    file), all three of %{flags}, %{compile_flags} and %{link_flags} will be used
+    in the same command line. In other words, the test format doesn't perform
+    separate compilation and linking steps in this case.
+
+
+    Additional supported directives
+    ===============================
+    In addition to everything that's supported in Lit ShTests, this test format
+    also understands the following directives inside test files:
+
+        // FILE_DEPENDENCIES: file, directory, /path/to/file
+
+            This directive expresses that the test requires the provided files
+            or directories in order to run. An example is a test that requires
+            some test input stored in a data file. When a test file contains
+            such a directive, this test format will collect them and copy them
+            to the directory represented by %T. The intent is that %T contains
+            all the inputs necessary to run the test, such that e.g. execution
+            on a remote host can be done by simply copying %T to the host.
+
+        // ADDITIONAL_COMPILE_FLAGS: flag1, flag2, flag3
+
+            This directive will cause the provided flags to be added to the
+            %{compile_flags} substitution for the test that contains it. This
+            allows adding special compilation flags without having to use a
+            .sh.cpp test, which would be more powerful but perhaps overkill.
+
+
+    Additional provided substitutions and features
+    ==============================================
+    The test format will define the following substitutions for use inside tests:
+
+        %{build}
+            Expands to a command-line that builds the current source
+            file with the %{flags}, %{compile_flags} and %{link_flags}
+            substitutions, and that produces an executable named %t.exe.
+
+        %{run}
+            Equivalent to `%{exec} %t.exe`. This is intended to be used
+            in conjunction with the %{build} substitution.
+    """
+    def getTestsInDirectory(self, testSuite, pathInSuite, litConfig, localConfig):
+        SUPPORTED_SUFFIXES = ['[.]pass[.]cpp$', '[.]pass[.]mm$', '[.]run[.]fail[.]cpp$',
+                              '[.]compile[.]pass[.]cpp$', '[.]compile[.]fail[.]cpp$',
+                              '[.]link[.]pass[.]cpp$', '[.]link[.]fail[.]cpp$',
+                              '[.]sh[.][^.]+$',
+                              '[.]verify[.]cpp$',
+                              '[.]fail[.]cpp$']
+        sourcePath = testSuite.getSourcePath(pathInSuite)
+        for filename in os.listdir(sourcePath):
             # Ignore dot files and excluded tests.
             if filename.startswith('.') or filename in localConfig.excludes:
                 continue
 
-            filepath = os.path.join(source_path, filename)
+            filepath = os.path.join(sourcePath, filename)
             if not os.path.isdir(filepath):
-                if any([filename.endswith(ext)
-                        for ext in localConfig.suffixes]):
-                    yield lit.Test.Test(testSuite, path_in_suite + (filename,),
-                                        localConfig)
-
-    def execute(self, test, lit_config):
-        while True:
-            try:
-                return self._execute(test, lit_config)
-            except OSError as oe:
-                if oe.errno != errno.ETXTBSY:
-                    raise
-                time.sleep(0.1)
-
-    def _execute(self, test, lit_config):
-        name = test.path_in_suite[-1]
-        name_root, name_ext = os.path.splitext(name)
-        is_libcxx_test = test.path_in_suite[0] == 'libcxx'
-        is_sh_test = name_root.endswith('.sh')
-        is_pass_test = name.endswith('.pass.cpp') or name.endswith('.pass.mm')
-        is_fail_test = name.endswith('.fail.cpp') or name.endswith('.fail.mm')
-        is_objcxx_test = name.endswith('.mm')
-        is_objcxx_arc_test = name.endswith('.arc.pass.mm') or \
-                             name.endswith('.arc.fail.mm')
-        assert is_sh_test or name_ext == '.cpp' or name_ext == '.mm', \
-            'non-cpp file must be sh test'
+                if any([re.search(ext, filename) for ext in SUPPORTED_SUFFIXES]):
+                    yield lit.Test.Test(testSuite, pathInSuite + (filename,), localConfig)
+
+    def _checkBaseSubstitutions(self, substitutions):
+        substitutions = [s for (s, _) in substitutions]
+        for s in ['%{cxx}', '%{compile_flags}', '%{link_flags}', '%{flags}', '%{exec}']:
+            assert s in substitutions, "Required substitution {} was not provided".format(s)
 
+    def _disableWithModules(self, test):
+        with open(test.getSourcePath(), 'rb') as f:
+            contents = f.read()
+        return b'#define _LIBCPP_ASSERT' in contents
+
+    def execute(self, test, litConfig):
+        self._checkBaseSubstitutions(test.config.substitutions)
+        VERIFY_FLAGS = '-Xclang -verify -Xclang -verify-ignore-unexpected=note -ferror-limit=0'
+        supportsVerify = _supportsVerify(test.config)
+        filename = test.path_in_suite[-1]
+
+        # TODO(ldionne): We currently disable tests that re-define _LIBCPP_ASSERT
+        #                when we run with modules enabled. Instead, we should
+        #                split the part that does a death test outside of the
+        #                test, and only disable that part when modules are
+        #                enabled.
+        if '-fmodules' in test.config.available_features and self._disableWithModules(test):
+            return lit.Test.Result(lit.Test.UNSUPPORTED, 'Test {} is unsupported when modules are enabled')
+
+        if re.search('[.]sh[.][^.]+$', filename):
+            steps = [ ] # The steps are already in the script
+            return self._executeShTest(test, litConfig, steps)
+        elif filename.endswith('.compile.pass.cpp'):
+            steps = [
+                "%dbg(COMPILED WITH) %{cxx} %s %{flags} %{compile_flags} -fsyntax-only"
+            ]
+            return self._executeShTest(test, litConfig, steps)
+        elif filename.endswith('.compile.fail.cpp'):
+            steps = [
+                "%dbg(COMPILED WITH) ! %{cxx} %s %{flags} %{compile_flags} -fsyntax-only"
+            ]
+            return self._executeShTest(test, litConfig, steps)
+        elif filename.endswith('.link.pass.cpp'):
+            steps = [
+                "%dbg(COMPILED WITH) %{cxx} %s %{flags} %{compile_flags} %{link_flags} -o %t.exe"
+            ]
+            return self._executeShTest(test, litConfig, steps)
+        elif filename.endswith('.link.fail.cpp'):
+            steps = [
+                "%dbg(COMPILED WITH) %{cxx} %s %{flags} %{compile_flags} -c -o %t.o",
+                "%dbg(LINKED WITH) ! %{cxx} %t.o %{flags} %{link_flags} -o %t.exe"
+            ]
+            return self._executeShTest(test, litConfig, steps)
+        elif filename.endswith('.run.fail.cpp'):
+            steps = [
+                "%dbg(COMPILED WITH) %{cxx} %s %{flags} %{compile_flags} %{link_flags} -o %t.exe",
+                "%dbg(EXECUTED AS) %{exec} ! %t.exe"
+            ]
+            return self._executeShTest(test, litConfig, steps)
+        elif filename.endswith('.verify.cpp'):
+            if not supportsVerify:
+                return lit.Test.Result(lit.Test.UNSUPPORTED,
+                    "Test {} requires support for Clang-verify, which isn't supported by the compiler".format(test.getFullName()))
+            steps = [
+                # Note: Use -Wno-error to make sure all diagnostics are not treated as errors,
+                #       which doesn't make sense for clang-verify tests.
+                "%dbg(COMPILED WITH) %{{cxx}} %s %{{flags}} %{{compile_flags}} -fsyntax-only -Wno-error {}".format(VERIFY_FLAGS)
+            ]
+            return self._executeShTest(test, litConfig, steps)
+        # Make sure to check these ones last, since they will match other
+        # suffixes above too.
+        elif filename.endswith('.pass.cpp') or filename.endswith('.pass.mm'):
+            steps = [
+                "%dbg(COMPILED WITH) %{cxx} %s %{flags} %{compile_flags} %{link_flags} -o %t.exe",
+                "%dbg(EXECUTED AS) %{exec} %t.exe"
+            ]
+            return self._executeShTest(test, litConfig, steps)
+        # This is like a .verify.cpp test when clang-verify is supported,
+        # otherwise it's like a .compile.fail.cpp test. This is only provided
+        # for backwards compatibility with the test suite.
+        elif filename.endswith('.fail.cpp'):
+            if supportsVerify:
+                steps = [
+                    "%dbg(COMPILED WITH) %{{cxx}} %s %{{flags}} %{{compile_flags}} -fsyntax-only -Wno-error {}".format(VERIFY_FLAGS)
+                ]
+            else:
+                steps = [
+                    "%dbg(COMPILED WITH) ! %{cxx} %s %{flags} %{compile_flags} -fsyntax-only"
+                ]
+            return self._executeShTest(test, litConfig, steps)
+        else:
+            return lit.Test.Result(lit.Test.UNRESOLVED, "Unknown test suffix for '{}'".format(filename))
+
+    # Utility function to add compile flags in lit.local.cfg files.
+    def addCompileFlags(self, config, *flags):
+        string = ' '.join(flags)
+        config.substitutions = [(s, x + ' ' + string) if s == '%{compile_flags}' else (s, x) for (s, x) in config.substitutions]
+
+    def _executeShTest(self, test, litConfig, steps):
         if test.config.unsupported:
-            return (lit.Test.UNSUPPORTED,
-                    "A lit.local.cfg marked this unsupported")
-
-        if is_objcxx_test and not \
-           'objective-c++' in test.config.available_features:
-            return (lit.Test.UNSUPPORTED, "Objective-C++ is not supported")
-
-        parsers = self._make_custom_parsers()
-        script = lit.TestRunner.parseIntegratedTestScript(
-            test, additional_parsers=parsers, require_script=is_sh_test)
-        # Check if a result for the test was returned. If so return that
-        # result.
+            return lit.Test.Result(lit.Test.UNSUPPORTED, 'Test is unsupported')
+
+        script = parseScript(test, steps)
         if isinstance(script, lit.Test.Result):
             return script
-        if lit_config.noExecute:
-            return lit.Test.Result(lit.Test.PASS)
-
-        # Check that we don't have run lines on tests that don't support them.
-        if not is_sh_test and len(script) != 0:
-            lit_config.fatal('Unsupported RUN line found in test %s' % name)
-
-        tmpDir, tmpBase = lit.TestRunner.getTempPaths(test)
-        substitutions = lit.TestRunner.getDefaultSubstitutions(test, tmpDir,
-                                                               tmpBase)
-        script = lit.TestRunner.applySubstitutions(script, substitutions)
-
-        test_cxx = copy.deepcopy(self.cxx)
-        if is_fail_test:
-            test_cxx.useCCache(False)
-            test_cxx.useWarnings(False)
-        extra_modules_defines = self._get_parser('MODULES_DEFINES:',
-                                                 parsers).getValue()
-        if '-fmodules' in test.config.available_features:
-            test_cxx.compile_flags += [('-D%s' % mdef.strip()) for
-                                       mdef in extra_modules_defines]
-            test_cxx.addWarningFlagIfSupported('-Wno-macro-redefined')
-            # FIXME: libc++ debug tests #define _LIBCPP_ASSERT to override it
-            # If we see this we need to build the test against uniquely built
-            # modules.
-            if is_libcxx_test:
-                with open(test.getSourcePath(), 'rb') as f:
-                    contents = f.read()
-                if b'#define _LIBCPP_ASSERT' in contents:
-                    test_cxx.useModules(False)
-
-        if is_objcxx_test:
-            test_cxx.source_lang = 'objective-c++'
-            if is_objcxx_arc_test:
-                test_cxx.compile_flags += ['-fobjc-arc']
-            else:
-                test_cxx.compile_flags += ['-fno-objc-arc']
-            test_cxx.link_flags += ['-framework', 'Foundation']
-
-        # Dispatch the test based on its suffix.
-        if is_sh_test:
-            if not isinstance(self.executor, LocalExecutor):
-                # We can't run ShTest tests with a executor yet.
-                # For now, bail on trying to run them
-                return lit.Test.UNSUPPORTED, 'ShTest format not yet supported'
-            test.config.environment = self.executor.merge_environments(os.environ, self.exec_env)
-            return lit.TestRunner._runShTest(test, lit_config,
-                                             self.execute_external, script,
-                                             tmpBase)
-        elif is_fail_test:
-            return self._evaluate_fail_test(test, test_cxx, parsers)
-        elif is_pass_test:
-            return self._evaluate_pass_test(test, tmpBase, lit_config,
-                                            test_cxx, parsers)
-        else:
-            # No other test type is supported
-            assert False
-
-    def _clean(self, exec_path):  # pylint: disable=no-self-use
-        libcxx.util.cleanFile(exec_path)
-
-    def _evaluate_pass_test(self, test, tmpBase, lit_config,
-                            test_cxx, parsers):
-        execDir = os.path.dirname(test.getExecPath())
-        source_path = test.getSourcePath()
-        exec_path = tmpBase + '.exe'
-        object_path = tmpBase + '.o'
-        # Create the output directory if it does not already exist.
-        libcxx.util.mkdir_p(os.path.dirname(tmpBase))
-        try:
-            # Compile the test
-            cmd, out, err, rc = test_cxx.compileLinkTwoSteps(
-                source_path, out=exec_path, object_file=object_path,
-                cwd=execDir)
-            compile_cmd = cmd
-            if rc != 0:
-                report = libcxx.util.makeReport(cmd, out, err, rc)
-                report += "Compilation failed unexpectedly!"
-                return lit.Test.Result(lit.Test.FAIL, report)
-            # Run the test
-            local_cwd = os.path.dirname(source_path)
-            env = None
-            if self.exec_env:
-                env = self.exec_env
-            # TODO: Only list actually needed files in file_deps.
-            # Right now we just mark all of the .dat files in the same
-            # directory as dependencies, but it's likely less than that. We
-            # should add a `// FILE-DEP: foo.dat` to each test to track this.
-            data_files = [os.path.join(local_cwd, f)
-                          for f in os.listdir(local_cwd) if f.endswith('.dat')]
-            is_flaky = self._get_parser('FLAKY_TEST.', parsers).getValue()
-            max_retry = 3 if is_flaky else 1
-            for retry_count in range(max_retry):
-                cmd, out, err, rc = self.executor.run(exec_path, [exec_path],
-                                                      local_cwd, data_files,
-                                                      env)
-                report = "Compiled With: '%s'\n" % ' '.join(compile_cmd)
-                report += libcxx.util.makeReport(cmd, out, err, rc)
-                if rc == 0:
-                    res = lit.Test.PASS if retry_count == 0 else lit.Test.FLAKYPASS
-                    return lit.Test.Result(res, report)
-                elif rc != 0 and retry_count + 1 == max_retry:
-                    report += "Compiled test failed unexpectedly!"
-                    return lit.Test.Result(lit.Test.FAIL, report)
-
-            assert False # Unreachable
-        finally:
-            # Note that cleanup of exec_file happens in `_clean()`. If you
-            # override this, cleanup is your reponsibility.
-            libcxx.util.cleanFile(object_path)
-            self._clean(exec_path)
-
-    def _evaluate_fail_test(self, test, test_cxx, parsers):
-        source_path = test.getSourcePath()
-        # FIXME: lift this detection into LLVM/LIT.
-        with open(source_path, 'rb') as f:
-            contents = f.read()
-        verify_tags = [b'expected-note', b'expected-remark',
-                       b'expected-warning', b'expected-error',
-                       b'expected-no-diagnostics']
-        use_verify = self.use_verify_for_fail and \
-                     any([tag in contents for tag in verify_tags])
-        # FIXME(EricWF): GCC 5 does not evaluate static assertions that
-        # are dependant on a template parameter when '-fsyntax-only' is passed.
-        # This is fixed in GCC 6. However for now we only pass "-fsyntax-only"
-        # when using Clang.
-        if test_cxx.type != 'gcc':
-            test_cxx.flags += ['-fsyntax-only']
-        if use_verify:
-            test_cxx.useVerify()
-            test_cxx.useWarnings()
-            if '-Wuser-defined-warnings' in test_cxx.warning_flags:
-                test_cxx.warning_flags += ['-Wno-error=user-defined-warnings']
-        else:
-            # We still need to enable certain warnings on .fail.cpp test when
-            # -verify isn't enabled. Such as -Werror=unused-result. However,
-            # we don't want it enabled too liberally, which might incorrectly
-            # allow unrelated failure tests to 'pass'.
-            #
-            # Therefore, we check if the test was expected to fail because of
-            # nodiscard before enabling it
-            test_str_list = [b'ignoring return value', b'nodiscard',
-                             b'NODISCARD']
-            if any(test_str in contents for test_str in test_str_list):
-                test_cxx.flags += ['-Werror=unused-result']
-        cmd, out, err, rc = test_cxx.compile(source_path, out=os.devnull)
-        check_rc = lambda rc: rc == 0 if use_verify else rc != 0
-        report = libcxx.util.makeReport(cmd, out, err, rc)
-        if check_rc(rc):
-            return lit.Test.Result(lit.Test.PASS, report)
+
+        if litConfig.noExecute:
+            return lit.Test.Result(lit.Test.XFAIL if test.isExpectedToFail() else lit.Test.PASS)
         else:
-            report += ('Expected compilation to fail!\n' if not use_verify else
-                       'Expected compilation using verify to pass!\n')
-            return lit.Test.Result(lit.Test.FAIL, report)
+            _, tmpBase = _getTempPaths(test)
+            useExternalSh = True
+            return lit.TestRunner._runShTest(test, litConfig, useExternalSh, script, tmpBase)
diff --git a/gnu/llvm/libcxx/utils/libcxx/test/params.py b/gnu/llvm/libcxx/utils/libcxx/test/params.py
new file mode 100644
index 00000000000..864a5108fc0
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/libcxx/test/params.py
@@ -0,0 +1,45 @@
+#===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===----------------------------------------------------------------------===##
+
+from libcxx.test.dsl import *
+
+_allStandards = ['c++98', 'c++03', 'c++11', 'c++14', 'c++17', 'c++2a']
+
+parameters = [
+  # Core parameters of the test suite
+  Parameter(name='std', choices=_allStandards, type=str,
+            help="The version of the standard to compile the test suite with.",
+            default=lambda cfg: next(s for s in reversed(_allStandards) if hasCompileFlag(cfg, '-std='+s)),
+            feature=lambda std:
+              Feature(name=std, compileFlag='-std={}'.format(std),
+                      when=lambda cfg: hasCompileFlag(cfg, '-std={}'.format(std)))),
+
+  Parameter(name='enable_exceptions', choices=[True, False], type=bool, default=True,
+            help="Whether to enable exceptions when compiling the test suite.",
+            feature=lambda exceptions: None if exceptions else
+              Feature(name='no-exceptions', compileFlag='-fno-exceptions')),
+
+  Parameter(name='stdlib', choices=['libc++', 'libstdc++', 'msvc'], type=str, default='libc++',
+            help="The C++ Standard Library implementation being tested.",
+            feature=lambda stdlib: Feature(name=stdlib)),
+
+  # Parameters to enable or disable parts of the test suite
+  Parameter(name='enable_filesystem', choices=[True, False], type=bool, default=True,
+            help="Whether to enable tests for the C++ <filesystem> library.",
+            feature=lambda filesystem: None if filesystem else
+              Feature(name='c++filesystem-disabled')),
+
+  Parameter(name='enable_experimental', choices=[True, False], type=bool, default=False,
+          help="Whether to enable tests for experimental C++ libraries (typically Library Fundamentals TSes).",
+          feature=lambda experimental: None if not experimental else
+            Feature(name='c++experimental', linkFlag='-lc++experimental')),
+
+  Parameter(name='long_tests', choices=[True, False], type=bool, default=True,
+            help="Whether to tests that take longer to run. This can be useful when running on a very slow device.",
+            feature=lambda enabled: Feature(name='long_tests') if enabled else None),
+]
diff --git a/gnu/llvm/libcxx/utils/libcxx/test/target_info.py b/gnu/llvm/libcxx/utils/libcxx/test/target_info.py
index fa57a2c7485..3197276ffa5 100644
--- a/gnu/llvm/libcxx/utils/libcxx/test/target_info.py
+++ b/gnu/llvm/libcxx/utils/libcxx/test/target_info.py
@@ -7,7 +7,7 @@
 #===----------------------------------------------------------------------===//
 
 import importlib
-import locale
+import lit.util
 import os
 import platform
 import re
@@ -19,6 +19,7 @@ from libcxx.util import executeCommand
 class DefaultTargetInfo(object):
     def __init__(self, full_config):
         self.full_config = full_config
+        self.executor = None
 
     def platform(self):
         return sys.platform.lower().strip()
@@ -29,16 +30,9 @@ class DefaultTargetInfo(object):
     def is_darwin(self):
         return self.platform() == 'darwin'
 
-    def add_locale_features(self, features):
-        self.full_config.lit_config.warning(
-            "No locales entry for target_system: %s" % self.platform())
-
     def add_cxx_compile_flags(self, flags): pass
     def add_cxx_link_flags(self, flags): pass
-    def configure_env(self, env): pass
     def allow_cxxabi_link(self): return True
-    def add_sanitizer_features(self, sanitizer_type, features): pass
-    def use_lit_shell_default(self): return False
 
     def add_path(self, dest_env, new_path):
         if not new_path:
@@ -51,52 +45,17 @@ class DefaultTargetInfo(object):
                                            dest_env['PATH'])
 
 
-def test_locale(loc):
-    assert loc is not None
-    default_locale = locale.setlocale(locale.LC_ALL)
-    try:
-        locale.setlocale(locale.LC_ALL, loc)
-        return True
-    except locale.Error:
-        return False
-    finally:
-        locale.setlocale(locale.LC_ALL, default_locale)
-
-
-def add_common_locales(features, lit_config, is_windows=False):
-    # A list of locales needed by the test-suite.
-    # The list uses the canonical name for the locale used in the test-suite
-    # TODO: On Linux ISO8859 *may* needs to hyphenated.
-    locales = [
-        ('en_US.UTF-8', 'English_United States.1252'),
-        ('fr_FR.UTF-8', 'French_France.1252'),
-        ('ru_RU.UTF-8', 'Russian_Russia.1251'),
-        ('zh_CN.UTF-8', 'Chinese_China.936'),
-        ('fr_CA.ISO8859-1', 'French_Canada.1252'),
-        ('cs_CZ.ISO8859-2', 'Czech_Czech Republic.1250')
-    ]
-    for loc_id, windows_loc_name in locales:
-        loc_name = windows_loc_name if is_windows else loc_id
-        if test_locale(loc_name):
-            features.add('locale.{0}'.format(loc_id))
-        else:
-            lit_config.warning('The locale {0} is not supported by '
-                               'your platform. Some tests will be '
-                               'unsupported.'.format(loc_name))
-
-
 class DarwinLocalTI(DefaultTargetInfo):
     def __init__(self, full_config):
         super(DarwinLocalTI, self).__init__(full_config)
 
     def is_host_macosx(self):
-        name = subprocess.check_output(['sw_vers', '-productName']).strip()
+        name = lit.util.to_string(subprocess.check_output(['sw_vers', '-productName'])).strip()
         return name == "Mac OS X"
 
     def get_macosx_version(self):
         assert self.is_host_macosx()
-        version = subprocess.check_output(
-            ['sw_vers', '-productVersion']).strip()
+        version = lit.util.to_string(subprocess.check_output(['sw_vers', '-productVersion'])).strip()
         version = re.sub(r'([0-9]+\.[0-9]+)(\..*)?', r'\1', version)
         return version
 
@@ -135,9 +94,6 @@ class DarwinLocalTI(DefaultTargetInfo):
             version = self.get_sdk_version(name)
         return (True, name, version)
 
-    def add_locale_features(self, features):
-        add_common_locales(features, self.full_config.lit_config)
-
     def add_cxx_compile_flags(self, flags):
         if self.full_config.use_deployment:
             _, name, _ = self.full_config.config.deployment
@@ -156,21 +112,6 @@ class DarwinLocalTI(DefaultTargetInfo):
     def add_cxx_link_flags(self, flags):
         flags += ['-lSystem']
 
-    def configure_env(self, env):
-        library_paths = []
-        # Configure the library path for libc++
-        if self.full_config.cxx_runtime_root:
-            library_paths += [self.full_config.cxx_runtime_root]
-        elif self.full_config.use_system_cxx_lib:
-            if (os.path.isdir(str(self.full_config.use_system_cxx_lib))):
-                library_paths += [self.full_config.use_system_cxx_lib]
-
-        # Configure the abi library path
-        if self.full_config.abi_library_root:
-            library_paths += [self.full_config.abi_library_root]
-        if library_paths:
-            env['DYLD_LIBRARY_PATH'] = ':'.join(library_paths)
-
     def allow_cxxabi_link(self):
         # Don't link libc++abi explicitly on OS X because the symbols
         # should be available in libc++ directly.
@@ -181,9 +122,6 @@ class FreeBSDLocalTI(DefaultTargetInfo):
     def __init__(self, full_config):
         super(FreeBSDLocalTI, self).__init__(full_config)
 
-    def add_locale_features(self, features):
-        add_common_locales(features, self.full_config.lit_config)
-
     def add_cxx_link_flags(self, flags):
         flags += ['-lc', '-lm', '-lpthread', '-lgcc_s', '-lcxxrt']
 
@@ -192,9 +130,6 @@ class NetBSDLocalTI(DefaultTargetInfo):
     def __init__(self, full_config):
         super(NetBSDLocalTI, self).__init__(full_config)
 
-    def add_locale_features(self, features):
-        add_common_locales(features, self.full_config.lit_config)
-
     def add_cxx_link_flags(self, flags):
         flags += ['-lc', '-lm', '-lpthread', '-lgcc_s', '-lc++abi',
                   '-lunwind']
@@ -229,18 +164,6 @@ class LinuxLocalTI(DefaultTargetInfo):
         ver = ver.lower().strip().replace(' ', '-')
         return ver # Permitted to be None.
 
-    def add_locale_features(self, features):
-        add_common_locales(features, self.full_config.lit_config)
-        # Some linux distributions have different locale data than others.
-        # Insert the distributions name and name-version into the available
-        # features to allow tests to XFAIL on them.
-        name = self.platform_name()
-        ver = self.platform_ver()
-        if name:
-            features.add(name)
-        if name and ver:
-            features.add('%s-%s' % (name, ver))
-
     def add_cxx_compile_flags(self, flags):
         flags += ['-D__STDC_FORMAT_MACROS',
                   '-D__STDC_LIMIT_MACROS',
@@ -268,8 +191,8 @@ class LinuxLocalTI(DefaultTargetInfo):
             flags += [builtins_lib]
         else:
             flags += ['-lgcc']
-        use_libatomic = self.full_config.get_lit_bool('use_libatomic', False)
-        if use_libatomic:
+        has_libatomic = self.full_config.get_lit_bool('has_libatomic', False)
+        if has_libatomic:
             flags += ['-latomic']
         san = self.full_config.get_lit_conf('use_sanitizer', '').strip()
         if san:
@@ -278,21 +201,14 @@ class LinuxLocalTI(DefaultTargetInfo):
             # clang/lib/Driver/Tools.cpp
             flags += ['-lpthread', '-lrt', '-lm', '-ldl']
 
+class LinuxRemoteTI(LinuxLocalTI):
+    def __init__(self, full_config):
+        super(LinuxRemoteTI, self).__init__(full_config)
 
 class WindowsLocalTI(DefaultTargetInfo):
     def __init__(self, full_config):
         super(WindowsLocalTI, self).__init__(full_config)
 
-    def add_locale_features(self, features):
-        add_common_locales(features, self.full_config.lit_config,
-                           is_windows=True)
-
-    def use_lit_shell_default(self):
-        # Default to the internal shell on Windows, as bash on Windows is
-        # usually very slow.
-        return True
-
-
 def make_target_info(full_config):
     default = "libcxx.test.target_info.LocalTI"
     info_str = full_config.get_lit_conf('target_info', default)
diff --git a/gnu/llvm/libcxx/utils/libcxx/util.py b/gnu/llvm/libcxx/utils/libcxx/util.py
index 2fd95232abb..8c93f392ed3 100644
--- a/gnu/llvm/libcxx/utils/libcxx/util.py
+++ b/gnu/llvm/libcxx/utils/libcxx/util.py
@@ -286,3 +286,16 @@ def executeCommandVerbose(cmd, *args, **kwargs):
         report += "\n\nFailed!"
         sys.stderr.write('%s\n' % report)
     return out, err, exitCode
+
+
+def executeCommandOrDie(cmd, *args, **kwargs):
+    """
+    Execute a command and print its output on failure.
+    """
+    out, err, exitCode = executeCommand(cmd, *args, **kwargs)
+    if exitCode != 0:
+        report = makeReport(cmd, out, err, exitCode)
+        report += "\n\nFailed!"
+        sys.stderr.write('%s\n' % report)
+        sys.exit(exitCode)
+    return out, err, exitCode
diff --git a/gnu/llvm/libcxx/utils/merge_archives.py b/gnu/llvm/libcxx/utils/merge_archives.py
index 4c31854d2b7..cc96cb2aa50 100755
--- a/gnu/llvm/libcxx/utils/merge_archives.py
+++ b/gnu/llvm/libcxx/utils/merge_archives.py
@@ -143,7 +143,7 @@ def main():
 
     if args.use_libtool:
         files = [f for f in files if not f.startswith('__.SYMDEF')]
-        execute_command_verbose([libtool_exe, '-static', '-o', args.output] + files,
+        execute_command_verbose([libtool_exe, '-static', '-o', args.output, '-s'] + files,
                                 cwd=temp_directory_root, verbose=args.verbose)
     else:
         execute_command_verbose([ar_exe, 'rcs', args.output] + files,
diff --git a/gnu/llvm/libcxx/utils/run.py b/gnu/llvm/libcxx/utils/run.py
index fcfee96c69e..e88fff12824 100644
--- a/gnu/llvm/libcxx/utils/run.py
+++ b/gnu/llvm/libcxx/utils/run.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
@@ -12,27 +13,37 @@ It can perform code signing, forward arguments to the program, and return the
 program's error code.
 """
 
+import argparse
 import subprocess
 import sys
 
 
 def main():
-    codesign_ident = sys.argv[1]
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--execdir', type=str, required=True)
+    parser.add_argument('--codesign_identity', type=str, required=False, default=None)
+    parser.add_argument('--env', type=str, nargs='*', required=False, default=dict())
+    (args, remaining) = parser.parse_known_args(sys.argv[1:])
 
-    # Ignore 'run.py' and the codesigning identity.
-    argv = sys.argv[2:]
-
-    exec_path = argv[0]
+    if len(remaining) < 2:
+        sys.stderr.write('Missing actual commands to run')
+        exit(1)
+    commandLine = remaining[1:] # Skip the '--'
 
     # Do any necessary codesigning.
-    if codesign_ident:
-        sign_cmd = ['xcrun', 'codesign', '-f', '-s', codesign_ident, exec_path]
-        cs_rc = subprocess.call(sign_cmd, env={})
-        if cs_rc != 0:
-            sys.stderr.write('Failed to codesign: ' + exec_path)
-            return cs_rc
-
-    return subprocess.call(argv)
+    if args.codesign_identity:
+        exe = commandLine[0]
+        rc = subprocess.call(['xcrun', 'codesign', '-f', '-s', args.codesign_identity, exe], env={})
+        if rc != 0:
+            sys.stderr.write('Failed to codesign: ' + exe)
+            return rc
+
+    # Extract environment variables into a dictionary
+    env = {k : v  for (k, v) in map(lambda s: s.split('=', 1), args.env)}
+
+    # Run the command line with the given environment in the execution directory.
+    return subprocess.call(subprocess.list2cmdline(commandLine), cwd=args.execdir, env=env, shell=True)
+
 
 if __name__ == '__main__':
     exit(main())
diff --git a/gnu/llvm/libcxx/utils/ssh.py b/gnu/llvm/libcxx/utils/ssh.py
new file mode 100755
index 00000000000..f74ed785bbb
--- /dev/null
+++ b/gnu/llvm/libcxx/utils/ssh.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python
+#===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===----------------------------------------------------------------------===##
+
+"""
+Runs an executable on a remote host.
+
+This is meant to be used as an executor when running the C++ Standard Library
+conformance test suite.
+"""
+
+import argparse
+import os
+import posixpath
+import subprocess
+import sys
+import tarfile
+import tempfile
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--host', type=str, required=True)
+    parser.add_argument('--execdir', type=str, required=True)
+    parser.add_argument('--codesign_identity', type=str, required=False, default=None)
+    parser.add_argument('--env', type=str, nargs='*', required=False, default=dict())
+    (args, remaining) = parser.parse_known_args(sys.argv[1:])
+
+    if len(remaining) < 2:
+        sys.stderr.write('Missing actual commands to run')
+        return 1
+
+    commandLine = remaining[1:] # Skip the '--'
+
+    ssh = lambda command: ['ssh', '-oBatchMode=yes', args.host, command]
+    scp = lambda src, dst: ['scp', '-q', '-oBatchMode=yes', src, '{}:{}'.format(args.host, dst)]
+
+    # Create a temporary directory where the test will be run.
+    # That is effectively the value of %T on the remote host.
+    tmp = subprocess.check_output(ssh('mktemp -d /tmp/libcxx.XXXXXXXXXX'), universal_newlines=True).strip()
+
+    # HACK:
+    # If an argument is a file that ends in `.tmp.exe`, assume it is the name
+    # of an executable generated by a test file. We call these test-executables
+    # below. This allows us to do custom processing like codesigning test-executables
+    # and changing their path when running on the remote host. It's also possible
+    # for there to be no such executable, for example in the case of a .sh.cpp
+    # test.
+    isTestExe = lambda exe: exe.endswith('.tmp.exe') and os.path.exists(exe)
+    pathOnRemote = lambda file: posixpath.join(tmp, os.path.basename(file))
+
+    try:
+        # Do any necessary codesigning of test-executables found in the command line.
+        if args.codesign_identity:
+            for exe in filter(isTestExe, commandLine):
+                subprocess.check_call(['xcrun', 'codesign', '-f', '-s', args.codesign_identity, exe], env={})
+
+        # tar up the execution directory (which contains everything that's needed
+        # to run the test), and copy the tarball over to the remote host.
+        try:
+            tmpTar = tempfile.NamedTemporaryFile(suffix='.tar', delete=False)
+            with tarfile.open(fileobj=tmpTar, mode='w') as tarball:
+                tarball.add(args.execdir, arcname=os.path.basename(args.execdir))
+
+            # Make sure we close the file before we scp it, because accessing
+            # the temporary file while still open doesn't work on Windows.
+            tmpTar.close()
+            remoteTarball = pathOnRemote(tmpTar.name)
+            subprocess.check_call(scp(tmpTar.name, remoteTarball))
+        finally:
+            # Make sure we close the file in case an exception happens before
+            # we've closed it above -- otherwise close() is idempotent.
+            tmpTar.close()
+            os.remove(tmpTar.name)
+
+        # Untar the dependencies in the temporary directory and remove the tarball.
+        remoteCommands = [
+            'tar -xf {} -C {} --strip-components 1'.format(remoteTarball, tmp),
+            'rm {}'.format(remoteTarball)
+        ]
+
+        # Make sure all test-executables in the remote command line have 'execute'
+        # permissions on the remote host. The host that compiled the test-executable
+        # might not have a notion of 'executable' permissions.
+        for exe in map(pathOnRemote, filter(isTestExe, commandLine)):
+            remoteCommands.append('chmod +x {}'.format(exe))
+
+        # Execute the command through SSH in the temporary directory, with the
+        # correct environment. We tweak the command line to run it on the remote
+        # host by transforming the path of test-executables to their path in the
+        # temporary directory on the remote host.
+        commandLine = (pathOnRemote(x) if isTestExe(x) else x for x in commandLine)
+        remoteCommands.append('cd {}'.format(tmp))
+        if args.env:
+            remoteCommands.append('export {}'.format(' '.join(args.env)))
+        remoteCommands.append(subprocess.list2cmdline(commandLine))
+
+        # Finally, SSH to the remote host and execute all the commands.
+        rc = subprocess.call(ssh(' && '.join(remoteCommands)))
+        return rc
+
+    finally:
+        # Make sure the temporary directory is removed when we're done.
+        subprocess.check_call(ssh('rm -r {}'.format(tmp)))
+
+
+if __name__ == '__main__':
+    exit(main())
diff --git a/gnu/llvm/libcxx/utils/sym_match.py b/gnu/llvm/libcxx/utils/sym_match.py
index 1fd39ca5f83..e1fd28bd6a5 100755
--- a/gnu/llvm/libcxx/utils/sym_match.py
+++ b/gnu/llvm/libcxx/utils/sym_match.py
@@ -19,7 +19,7 @@ def main():
     parser = ArgumentParser(
         description='Extract a list of symbols from a shared library.')
     parser.add_argument(
-        '--blacklist', dest='blacklist',
+        '--exclusions', dest='exclusions',
         type=str, action='store', default=None)
     parser.add_argument(
         'symbol_list', metavar='symbol_list', type=str,
@@ -29,11 +29,11 @@ def main():
         help='The file containing the new symbol list or a library')
     args = parser.parse_args()
 
-    if not args.regexes and args.blacklist is None:
-        sys.stderr.write('Either a regex or a blacklist must be specified.\n')
+    if not args.regexes and args.exclusions is None:
+        sys.stderr.write('Either a regex or a exclusions must be specified.\n')
         sys.exit(1)
-    if args.blacklist:
-        search_list = util.read_blacklist(args.blacklist)
+    if args.exclusions:
+        search_list = util.read_exclusions(args.exclusions)
     else:
         search_list = args.regexes