llvm: Use Component in OpenBSD::getCompilerRT to find libraries

Clang uses runtime libraries for some advanced features like
sanitizers. Different systems have different preferences about file
placement. OpenBSD with this change would use this name for ASan:
/usr/lib/clang/11.1.0/lib/libclang_rt.asan.a

So far, no libraries are shipped, only their eventual location is chosen.

Discussed with deraadt@ and kettenis@, OK mortimer@

diff --git a/gnu/llvm/clang/lib/Driver/ToolChains/OpenBSD.cpp b/gnu/llvm/clang/lib/Driver/ToolChains/OpenBSD.cpp
index 5333cec..41df6d9 100644 (file)
--- a/gnu/llvm/clang/lib/Driver/ToolChains/OpenBSD.cpp
+++ b/gnu/llvm/clang/lib/Driver/ToolChains/OpenBSD.cpp
@@ -300,9 +300,17 @@ void OpenBSD::AddCXXStdlibLibArgs(const ArgList &Args,
 std::string OpenBSD::getCompilerRT(const ArgList &Args,
                                    StringRef Component,
                                    FileType Type) const {
-  SmallString<128> Path(getDriver().SysRoot);
-  llvm::sys::path::append(Path, "/usr/lib/libcompiler_rt.a");
-  return std::string(Path.str());
+  if (Component == "builtins") {
+    SmallString<128> Path(getDriver().SysRoot);
+    llvm::sys::path::append(Path, "/usr/lib/libcompiler_rt.a");
+    return std::string(Path.str());
+  } else {
+    SmallString<128> P(getDriver().ResourceDir);
+    std::string CRTBasename =
+        getCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
+    llvm::sys::path::append(P, "lib", CRTBasename);
+    return std::string(P.str());
+  }
 }
 
 Tool *OpenBSD::buildAssembler() const {