From d8716676ea9cea863aa87822ecb3eb9acb7a23c4 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 17 Feb 2010 01:38:01 +0000
Subject: [PATCH] add a comment explaining why darwin/i386 uses ## as a
 comment. It's not clear why this is really required, but it was explicitly
 added in r48808 with no real explanation or rdar #.

llvm-svn: 96438
---
 llvm/lib/Target/X86/X86MCAsmInfo.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/Target/X86/X86MCAsmInfo.cpp b/llvm/lib/Target/X86/X86MCAsmInfo.cpp
index 6701fabe03a2..b220cff54c88 100644
--- a/llvm/lib/Target/X86/X86MCAsmInfo.cpp
+++ b/llvm/lib/Target/X86/X86MCAsmInfo.cpp
@@ -55,6 +55,8 @@ X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
   if (!is64Bit)
     Data64bitsDirective = 0;       // we can't emit a 64-bit unit
 
+  // Use ## as a comment string so that .s files generated by llvm can go
+  // through the GCC preprocessor without causing an error.
   CommentString = "##";
   PCSymbol = ".";