Add '#ifndef _PTRDIFF_T' guard around definition of ptrdiff_t. Fixes <rdar://problem...

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128578 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Headers/stddef.h b/lib/Headers/stddef.h
index 7cc0bc1a75fdfcad4ebb80ff86a6f16ace182bbe..01c331c01980ca8813c7dda898d899d3fa209c72 100644 (file)
--- 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;