From d8cf40372ed64ba69f8d0d7c79bebdf293dd5d1e Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Tue, 2 Jun 2009 17:35:55 +0000
Subject: [PATCH] Undef MemoryFence when compiling on MSVC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72732 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/System/Atomic.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/System/Atomic.cpp b/lib/System/Atomic.cpp
index 8c61ff1069f..cefd0bbf553 100644
--- a/lib/System/Atomic.cpp
+++ b/lib/System/Atomic.cpp
@@ -18,6 +18,7 @@ using namespace llvm;
 
 #if defined(_MSC_VER)
 #include <windows.h>
+#undef MemoryFence
 #endif
 
 void sys::MemoryFence() {
-- 
2.34.1