[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 #13 from Sergey Fedorov <vital.had at gmail dot com> ---
(In reply to Jakub Jelinek from comment #10)
> -xobjective-c should work fine with both gcc and clang and is much better
> designed, it isn't about two almost dead languages, but allows specifying
> any language the compiler supports.

-xobjective-c worked, gegl builds now. Thank you.