trcrsired wrote:

> > I've always kind of held out this idea that clang[++] are perfectly 
> > reasonable frontends to use when targeting an MSVC-environment with an 
> > official Microsoft Windows SDK
> 
> Me too, but isn't this PR a different idea? This is about using clang with 
> MSVC/Win SDK turned into a Unix-style sysroot, which seems like a much 
> narrower use case.
> 
> I think it would be better if the driver could work with the MSVC/SDK as-is, 
> rather than forcing the user to change the SDK into a form that the driver 
> likes (even if it's a "standard" form in the sense that other sysroots use 
> it). That would probably require more work, such as supporting 
> case-insensitive includes, but seems like it would be much user friendlier.
> 
> But I won't block this if there's otherwise strong support for it.

cross compiling is not a narrow use bro.

And this PR will allow using libc++ with microsoft sdk too and unfortunately 
microsoft puts C headers and MSVC STL headers together. Without a UNIX style 
sysroot that seperates msvc stl headers into a seperate  include/c++/msvcstl 
there is no way to get it work.

https://github.com/llvm/llvm-project/pull/96417
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