From 8da6bca896546cd98ad6aefaa3e9eba77736ea7b Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Wed, 30 Mar 2011 21:43:52 +0000
Subject: [PATCH] Add '#ifndef _PTRDIFF_T' guard around definition of
 ptrdiff_t.  Fixes <rdar://problem/9210154>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128578 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Headers/stddef.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Headers/stddef.h b/lib/Headers/stddef.h
index 7cc0bc1a75..01c331c019 100644
--- a/lib/Headers/stddef.h
+++ b/lib/Headers/stddef.h
@@ -26,7 +26,10 @@
 #ifndef __STDDEF_H
 #define __STDDEF_H
 
+#ifndef _PTRDIFF_T
+#define _PTRDIFF_T
 typedef __typeof__(((int*)0)-((int*)0)) ptrdiff_t;
+#endif
 #ifndef _SIZE_T
 #define _SIZE_T
 typedef __typeof__(sizeof(int)) size_t;
-- 
2.50.1