Eric Fiselier c411225462 Fix ATOMIC_<TYPE>_LOCK_FREE macros on Windows. ...

Previously the ATOMIC_<TYPE>_LOCK_FREE macros were implemented
using __GCC_ATOMIC_<TYPE>_LOCK_FREE but GCC specific macros
are defined when -fms-compatibility is specified.

To avoid this Libc++ now tries to use the newly added
__CLANG_ATOMIC_<TYPE>_LOCK_FREE macros instead, and only falls
back to the GCC versions when the Clang ones aren't available.

llvm-svn: 300920

2017-04-20 23:22:46 +00:00

62 KiB

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