[PATCH] D32265: Add __CLANG_ATOMIC_<TYPE>_LOCK_FREE macros for use in MSVC compatibility mode.

[Richard Smith via Phabricator via cfe-commits]

rsmith accepted this revision.
rsmith added a comment.
This revision is now accepted and ready to land.

I'm not thrilled about adding yet more predefined macros, but it really doesn't make sense for libc++ to depend on `__GCC_*` macros when targeting Windows, nor for these to be Windows-only, so let's do it.



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Comment at: lib/Frontend/InitPreprocessor.cpp:910-912
+  addLockFreeMacros("__CLANG_ATOMIC");
+  if (!LangOpts.MSVCCompat)
+    addLockFreeMacros("__GCC_ATOMIC");
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I'd sink the `_` into the prefix too, but this looks fine either way.


https://reviews.llvm.org/D32265