[Bug c/78352] GCC lacks support for the Apple "blocks" extension to the C family of languages

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78352

--- Comment #12 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Fabian Groffen from comment #11)
> Is there a patch or WIP somewhere I can try out or attempt to bring forwards?

I need to bring forward my patches to the latest master, will post a link here
when that is done (it won't be soon - mainly because all time is being soaked
up with work on the arm64 port for Apple Silicon). At present, I am also trying
to resolve some of the other (smaller) objective-c issues preventing us from
parsing the system headers.

> My attempts at porting the 4.2.1 Apple changes to 10.1 seem to have failed
> as I get some weird "byref undeclared" errors whenever a __block var is
> encountered.  I must admit I'm not really well versed with GCC's code.

The apple-4.2.1 branch is, indeed, too far removed from current trunk - and as
far as I understand, we would not be permitted to apply those patches anyway,
since they were not counted as contributed (not present on the FSF servers). 
IANAL - but that's how I understand the rules.

It would be great to have more than one person working on this - I will post
here when the current WIP is published somewhere.