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-rw-r--r--lib/Headers/stddef.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Headers/stddef.h b/lib/Headers/stddef.h
index 0c5c961d5e..6a64d6d32a 100644
--- a/lib/Headers/stddef.h
+++ b/lib/Headers/stddef.h
@@ -58,6 +58,9 @@ typedef __SIZE_TYPE__ rsize_t;
#if !defined(_WCHAR_T) || __has_feature(modules)
#if !__has_feature(modules)
#define _WCHAR_T
+#if defined(_MSC_EXTENSIONS)
+#define _WCHAR_T_DEFINED
+#endif
#endif
typedef __WCHAR_TYPE__ wchar_t;
#endif