[PATCH] D34588: Check for _MSC_VER before define _LIBCPP_MSVCRT

[Reid Kleckner via Phabricator via cfe-commits]

rnk accepted this revision.
rnk added a comment.
This revision is now accepted and ready to land.

> Some non-windows targets using MS extensions define _WIN32 for compatibility with Windows but do not have MSVC compatibility.

So, these hypothetical targets have the Win32 API available, but they do not use the MSVC CRT, correct? They could use musl, or some custom C runtime, but they don't want libc++ to aim for MSVCRT compatibility.

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In any case, checking _MSC_VER is the best thing I can think of for guessing if the MSVC CRT is going to be present, so this looks good.


https://reviews.llvm.org/D34588