In D111081#3633908, @mstorsjo wrote:

LGTM, thanks, and sorry for losing track of it earlier.

Do you need someone to push the patch for you? In that case, can you provide your preferred git author line for the patch?

In D111081#3627852, @MaskRay wrote:

Does Gentoo patch upstream to do something different? (.../g++-v10/...) Well, I wish that Gentoo does not do this.
This adds complexity to Clang which in practice tries to provide some drop-in replacement ability.

Rebased patch against current upstream

I can't see that any of the lib paths are tested at all, though I may be missing something.

Added tests