rnk added a comment.

In https://reviews.llvm.org/D28383#637570, @majnemer wrote:

> Why isn't this equivalent to `_MSC_VER` ?


It might also be nice for clang to define some macro to indicate which C++ ABI 
is in use.

All that said, I think it makes sense to encode this in libc++ 
include/__config_site because you don't want people to build libc++ for the MS 
ABI and then try to use it with a mingw triple. It'd be nice if we could 
diagnose that at compile time instead of link time.


Repository:
  rL LLVM

https://reviews.llvm.org/D28383



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