[PATCH] D17951: Implement is_always_lock_free

[Ben Craig via cfe-commits]

bcraig added a comment.

Visual Studio has a flag, /Zc:wchar_t-, that turns wchar_t into a short.  This flag is for people that need to maintain ABI compatibility with ancient Visual Studios (MSVC6? MSVC5?).  It is definitely non-conformant, and many things support it poorly.

I still have nightmares of supporting boost::filesystem users where boost::filesystem was built with real wchar_t, but clients tried to use it with wchar_t as short.  The linker generally disapproved of those shenanigans.

I'm totally fine if libcxx doesn't try to support this situation... but if it did want to support it, it would need to selectively not define wchar_t.


http://reviews.llvm.org/D17951