ci: build with clang instead of gcc #632
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This allows a speed-up of all QEMU targets by using a statically built clang that runs with the native architecture of the runner rather than calling gcc through QEMU.
CI should finish in roughly 30 minutes compared to 2h30 minutes in master.
This PR is mostly used as a PoC for this trick and see wether it would see adoption, what are the limitations and how it could be improved.
Clang used in this PR is built & published in the following repo: https://github.com/mayeut/static-clang-images