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



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