[PATCH] D14180: enable -fms-extensions by default on the mingw-w64 target

[Reid Kleckner via cfe-commits]

rnk added a comment.

In http://reviews.llvm.org/D14180#299183, @martell wrote:

> I tried testing __has_builtin(_InterlockedCompareExchangeAdd) as it seem to not exist even when -fms-extensions is passed
>  Is this a bug or it is intended ?


Neither Clang nor MSDN have anything by that name. Do you mean _InterlockedExchangeAdd? __has_builtin should find that.


http://reviews.llvm.org/D14180