[PATCH] D112081: Define __STDC_NO_THREADS__ when targeting windows-msvc (PR48704)

[Hans Wennborg via Phabricator via cfe-commits]

hans created this revision.
hans added reviewers: aaron.ballman, rnk.
hans requested review of this revision.
Herald added a project: clang.

MSVC's libc doesn't provide thread.h, so we should set the macro to indicate that.

We could just set it in C mode, but I noticed that Darwin sets it unconditionally, so perhaps we should do the same here.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D112081

Files:
  clang/lib/Basic/Targets/OSTargets.cpp
  clang/test/Preprocessor/init.c


Index: clang/test/Preprocessor/init.c
===================================================================
--- clang/test/Preprocessor/init.c
+++ clang/test/Preprocessor/init.c
@@ -192,6 +192,7 @@
 //
 // MSEXT-NOT:#define __STDC__
 // MSEXT:#define _INTEGRAL_MAX_BITS 64
+// MSEXT:#define __STDC_NO_THREADS__ 1
 // MSEXT-NOT:#define _NATIVE_WCHAR_T_DEFINED 1
 // MSEXT-NOT:#define _WCHAR_T_DEFINED 1
 //
Index: clang/lib/Basic/Targets/OSTargets.cpp
===================================================================
--- clang/lib/Basic/Targets/OSTargets.cpp
+++ clang/lib/Basic/Targets/OSTargets.cpp
@@ -201,6 +201,7 @@
   }
 
   Builder.defineMacro("_INTEGRAL_MAX_BITS", "64");
+  Builder.defineMacro("__STDC_NO_THREADS__");
 }
 
 void addWindowsDefines(const llvm::Triple &Triple, const LangOptions &Opts,


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