https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78267
--- Comment #29 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to Maxim Ostapenko from comment #28) > So, perhaps I can commit it (from #15) as Jakub suggested to restore GCC > bootstrap for now? if we're going down that path can we make the conditional __BLOCKS__ instead of __clang__ since that's the actual constraint. FWIW, the SDKs don't generally change once N+1 is out, so I think that the fixes to 10.10 and 10.11 will not be fragile, they just need doing and testing.