https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78267
--- Comment #34 from Eric Gallager <egall at gwmail dot gwu.edu> --- (In reply to Iain Sandoe from comment #23) > (In reply to Eric Gallager from comment #22) > > > > To be specific, they're not supported by the FSF release of GCC. Apple's > > fork of GCC supported blocks back before they ditched it for clang, so this > > isn't just a clang extension. > > Apple's blocks implementation was never submitted "upstream" is my > understanding, it's not present in any branch on an FSF server (and thus we > can't use it, even if it were usable 4.2 => 7.0, which it isn't without > significant re-work). > > (Let's not side-track this PR - perhaps we should just file one to cover > missing blocks support, 63651 already discusses two different problems). I opened bug 78352 for missing blocks support.