From 847307a35b33bf3b9c68510c71b41794de9f2cca Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Sat, 7 Apr 2012 02:24:20 +0000
Subject: [PATCH] Target/X86/MCTargetDesc/X86MCAsmInfo.cpp: Enable DwarfCFI
 (aka DW2) on Cygming.

Cygwin-1.7 supports dw2. Some recent mingw distros support one, too.
I have confirmed test-suite/SingleSource/Benchmarks/Shootout-C++/except.cpp can pass on Cygwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154247 91177308-0d34-0410-b5e6-96231b3b80d8
---
 docs/ReleaseNotes.html                       | 1 +
 lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 72153a99738..0b4a51148f0 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -384,6 +384,7 @@ Release Notes</a>.</h1>
   <li>Call instructions use the new register mask operands for faster compile
   times and better support for different calling conventions.  The old WINCALL
   instructions are no longer needed.</li>
+  <li>DW2 Exception Handling is enabled on Cygwin and MinGW.</li>
 </ul>
 
 </div>
diff --git a/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp b/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
index 003a14ab215..afa545cbb31 100644
--- a/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
@@ -155,4 +155,7 @@ X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {
   AssemblerDialect = AsmWriterFlavor;
 
   TextAlignFillValue = 0x90;
+
+  // Exceptions handling
+  ExceptionsType = ExceptionHandling::DwarfCFI;
 }