[clang] [clang] Support --sysroot= for ${arch}-windows-msvc targets (PR #96417)

[via cfe-commits]

YexuanXiao wrote:

> Lets split out the addition of the new flags for the unwind library, compiler runtime library, and C++ runtime. We can handle those additions separately. Adding them specifically with support for the MSVC layout and the MSVC flags gets us to a point where there is support for the functionality. From there, it is a question of how to get the argument handling mapped over properly.

The reason this isn't possible is that the STL headers are mixed with other headers in the same directory, making it impossible to specify them separately through options.


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