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

Wed Apr 19 20:26:14 PDT 2017

EricWF created this revision.
Herald added subscribers: dschuff, jfb.

Libc++ currently implements the `ATOMIC_<TYPE>_LOCK_FREE` macros using the `__GCC_ATOMIC_<TYPE>_LOCK_FREE` macros. However these are not available when MSVC compatibility is enabled even though C11 `_Atomic` is.  This prevents libc++ from correctly implementing `ATOMIC_<TYPE>_LOCK_FREE`.

This patch adds an alternative spelling `__CLANG_ATOMIC_<TYPE>_LOCK_FREE` that is enabled with `-fms-compatibility`.

https://reviews.llvm.org/D32265

Files:
  lib/Frontend/InitPreprocessor.cpp
  test/Preprocessor/init.c
  test/Sema/atomic-ops.c

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