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

[pinskia at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> AFAICT, this flag is redundant with GCC

No the correct flag is -xobjc