https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60512
--- Comment #17 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to Iain Sandoe from comment #16) > (In reply to Iain Sandoe from comment #15) > > (In reply to Alex Coplan from comment #14) > > > I'm working on this. > > > > I will rebase my WIP and push it somewhere - [ it has __has_feature and > > __has_extension components .. but likely bit rotten with changes to libcpp ] > > (sorry for being slow to do this - releases tie up all my Darwin time. > > https://github.com/iains/gcc-git/tree/master-wip-has-extension > > (it might not even build - I was hoping to have some time to refresh it - > but better publish now in case it's useful in any way ) heh, despite that I've not done anything to it since 2019 actually it builds and the tests pass - at least for C. Anyway, see what you think and how it lines up with your intended impl.