[cfe-dev] Building clang on Windows targeting gcc problem

[Edward Diener]

I am using cmake and ninja to build clang on Windows targeting gcc.

If I use the latest release of mingw/gcc, which is 4.8.1-4 everything 
works properly.

If I use the latest release of mingw64/gcc, which is 4.9.2-2 the build 
completes buit when I try to compile source code I get:

fatal error: 'cstddef' file not found

Is there some reason why on Windows mingw works but mingw64 does not ? 
Naturally I would want to use the latest gcc release on Windows rather 
than an earlier one.