r241432 - Teach mingw toolchain the msys2 mingw-w64 distribution C++ dirs.

[Joerg Sonnenberger]

On Mon, Jul 13, 2015 at 06:54:50PM +0300, Yaron Keren wrote:
> --- tools/clang/lib/Driver/MinGWToolChain.cpp	(revision 242033)
> +++ tools/clang/lib/Driver/MinGWToolChain.cpp	(working copy)
> @@ -24,8 +24,10 @@
>      : ToolChain(D, Triple, Args) {
>    getProgramPaths().push_back(getDriver().getInstalledDir());
>  
> +  llvm::SmallString<1024> LibDir;
>    if (getDriver().SysRoot.size())
>      Base = getDriver().SysRoot;
> +#ifdef LLVM_ON_WIN32
>    else if (llvm::ErrorOr<std::string> GPPName =

Please don't introduce such conditionals.

Joerg