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-rw-r--r--clang/lib/Headers/stddef.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Headers/stddef.h b/clang/lib/Headers/stddef.h
index b1d0d528746..fdd48159bab 100644
--- a/clang/lib/Headers/stddef.h
+++ b/clang/lib/Headers/stddef.h
@@ -40,6 +40,7 @@ typedef __typeof__(*L"") wchar_t;
#undef NULL
#ifdef __cplusplus
+#undef __null // VC++ hack.
#define NULL __null
#else
#define NULL ((void*)0)
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