[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

Eric Gallager <egall at gwmail dot gwu.edu> changed:

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--- Comment #22 from Eric Gallager <egall at gwmail dot gwu.edu> ---
(In reply to Iain Sandoe from comment #3)
> (In reply to Maxim Ostapenko from comment #1)
> > Eh, mine.
> > 
> > typedef void (^os_trace_payload_t)(xpc_object_t xdict) looks very strange,
> > it seems that it's an Objective-C declaration, right?
> 
> It's declaring os_trace_payload_t to of type "Apple block" (like a lambda
> that can be used over the whole of c-family);  Apple blocks are currently
> not supported by GCC.  There is no realistic work-around, any interface
> using blocks will fail, and thus either those interfaces need to be excluded
> from tests, or the tests skipped/xfailed.
>

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. Bug 63651 has more stuff about support for blocks in
FSF GCC.