Switching a distro to use clang-with-libstdc++ doesn't remove the dependency on GCC but adds a dependency on a combination that isn't properly supported by the vendor of clang or by libstdc++ upstream. That combination is likely to be fragile without an influx of libstdc++ contributors who care about clang, so any distro making the switch would need to do the work themselves, rather than expecting upstream GCC maintainers to help a non-copyleft compiler steal our lunch.
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