1 files changed, 8 insertions, 1 deletions
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index a9a5f4ddcfb..7deebc06c3e 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -97,7 +97,14 @@ void addCygMingDefines(const LangOptions &Opts, MacroBuilder &Builder) {
   }
 }
 
-void addMinGWDefines(const LangOptions &Opts, MacroBuilder &Builder) {
+void addMinGWDefines(const llvm::Triple &Triple, const LangOptions &Opts,
+                     MacroBuilder &Builder) {
+  DefineStd(Builder, "WIN32", Opts);
+  DefineStd(Builder, "WINNT", Opts);
+  if (Triple.isArch64Bit()) {
+    DefineStd(Builder, "WIN64", Opts);
+    Builder.defineMacro("__MINGW64__");
+  }
   Builder.defineMacro("__MSVCRT__");
   Builder.defineMacro("__MINGW32__");
   addCygMingDefines(Opts, Builder);