From 0db736d815ee5360cb95d2dafe35f5cc51193a62 Mon Sep 17 00:00:00 2001
From: espie <espie@openbsd.org>
Date: Wed, 28 Jun 2017 07:37:38 +0000
Subject: [PATCH] if we return nullptr for a "noexec" section, then don't
 change section. prevents core dumps :)

okay tedu@
---
 gnu/llvm/lib/MC/MCELFStreamer.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gnu/llvm/lib/MC/MCELFStreamer.cpp b/gnu/llvm/lib/MC/MCELFStreamer.cpp
index 0ef1b2a8bdc..fd0e3452071 100644
--- a/gnu/llvm/lib/MC/MCELFStreamer.cpp
+++ b/gnu/llvm/lib/MC/MCELFStreamer.cpp
@@ -91,8 +91,11 @@ void MCELFStreamer::InitSections(bool NoExecStack) {
   SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
   EmitCodeAlignment(4);
 
-  if (NoExecStack)
-    SwitchSection(Ctx.getAsmInfo()->getNonexecutableStackSection(Ctx));
+  if (NoExecStack) {
+    MCSection *s = Ctx.getAsmInfo()->getNonexecutableStackSection(Ctx);
+    if (s) 
+	SwitchSection(s);
+  }
 }
 
 void MCELFStreamer::EmitLabel(MCSymbol *S) {
-- 
2.20.1