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

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

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

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
fine with fixing it upstream - but also OK with trying to be compatible (esp.
with facilities that were present for ≈ 20 years, if those are not to intrusive
to arrange).