[Bug driver/97058] invalid "cc1: warning: '-Werror=' argument '-funroll-completely-grow-size' is not valid for C"

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97058

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
You're not supposed to use this flag but the behavior is indeed weird.  The
last part "not valid for C/C++" is due to the fact the option is not marked
for any language:

funroll-completely-grow-size
Undocumented Var(flag_cunroll_grow_size) Optimization
; Internal undocumented flag, allow size growth during complete unrolling

but the '-Werror=' argument part is really odd ;)