[Bug sanitizer/78267] [7 Regression] libsanitizer breaks bootstrap on x86_64-apple-darwin16 at r241977

[egall at gwmail dot gwu.edu]

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.