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-rw-r--r--Lex/Preprocessor.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/Lex/Preprocessor.cpp b/Lex/Preprocessor.cpp
index 2fe08c6715..141536a1be 100644
--- a/Lex/Preprocessor.cpp
+++ b/Lex/Preprocessor.cpp
@@ -429,6 +429,7 @@ static void InitializePredefinedMacros(Preprocessor &PP,
DefineBuiltinMacro(Buf, "__cdecl=");
DefineBuiltinMacro(Buf, "_cdecl=");
DefineBuiltinMacro(Buf, "__ptr64=");
+ DefineBuiltinMacro(Buf, "__w64=");
DefineBuiltinMacro(Buf, "__forceinline=");
DefineBuiltinMacro(Buf, "__int8=char");
DefineBuiltinMacro(Buf, "__int16=short");