[PATCH] Fix compilation under MinGW

[NAKAMURA Takumi]

Anton,

Could you introduce fpclass stuff in any other headers?
Excuse me, I cannot seek current version of mingw-w64 headers now.

Or, I suggest it'd be better to check the format in %e (and presence
of fpclass) in configuration.


> +#if defined(_WIN32) && !defined(__MINGW32__) && !defined(__MINGW64__)

I wonder why you were trying to exclude __MINGW32__ here. I assume
traditional mingw32 should have such definitions, (and I suppose
mingw-w64, as well.)
Let me know which distro you are using.


> Please review and apply (I have no commit access to llvm) if I guessed
> correctly and the patch is helpful.

You could commit llvm tree as well as clang. That said, review would
be required for non-trivial changes.
I guess your patch would cause failures in llvm unittests on mingw32.


...Takumi