[Bug c/86377] extern int errno; is treated as buggy function declaration [-Werror=strict-prototypes]

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86377

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to U.Mutlu from comment #8)
> It is possible to fix all the warnings and then use -Werror.

But only today. Tomorrow's compilers will have different warnings. And
yesterday's compilers too.

I think what you're trying to do is not something anybody really cares about
supporting.