MaskRay wrote:

I am unfamiliar with Darwin and @jansvoboda11 @ldionne can give a more 
authoritative answer, but I can share some feelings.

* Gnu.cpp uses `Generic_GCC::addLibCxxIncludePaths` so other versions (e.g. 
`usr/include/c++/v2`) are supported.
* Only one of `Dir`/`InstalledDir` should be used. If they are overridden by 
`-ccc-install-dir dir`, `path(clang)/../include/c++` should  be ignored.

This patch does not move toward the ideal situation IMHO.

https://github.com/llvm/llvm-project/pull/70817
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