System.Info.os

[Neil Mitchell]

> mingw32 is the only native Windows build we have right now, but it's not
> inconceivable that we might have an even-more-native build in the
> future, by bypassing mingw32 altogether.
The Windows build might be made using mingw32, but it runs natively
without relying on mingw32, as far as I can tell. It certainly runs on
my windows OS without having mingw32 installed (other than the bits
ghc installes additionally).

The WinHugs is now a genuinely 100% Windows build, using Visual Studio
- only the libraries are preprocessed under Mingw32.

> I guess I'm saying mingw32 doesn't really do much harm, and it's
> "correct" in some sense, but we should also have provided #ifdef
> win32_HOST_OS for those cases when you don't care.
That would be nice.

Thanks

Neil