https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99936
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Francois-Xavier Coudert from comment #4) > Currently still fails on x86_64-apple-darwin21 > (https://gcc.gnu.org/pipermail/gcc-testresults/2021-December/743901.html), > as well as the future aarch64-apple-darwin21. Looks like a front-end issue. It is, there are a few (many) C++ modules issues that are not target/host dependent.