[Bug objc/117478] -ObjC is not accepted: error: argument to '-O' should be a non-negative integer, 'g', 's', 'z' or 'fast'

[vital.had at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117478

--- Comment #11 from Sergey Fedorov <vital.had at gmail dot com> ---
(In reply to Eli Schwartz from comment #9)
> It's not a bad idea to "fix" it from both ends.
> 
> Projects such as gegl cannot compile on macOS using GCC 13 or 14, and that's
> not going to change. They can't really know what versions their users have
> installed, so the only real choice to support this case is to do a configure
> probe.
> 
> Not all projects will fix that, so the best that GCC can do is make those
> projects work with GCC 15.

Do you mean that even with the correct flag passed, the code won’t compile with
gcc14? While I have gcc15 locally (not updating it weekly though), few people
will until it is officially released and adopted by downstream distributions.

Gegl 0.4.48 built fine with gcc14 (but that was before -ObjC addition).