[Bug c/105444] Support for disabling all warnings

[eyalroz1 at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105444

--- Comment #3 from Eyal Rozenberg <eyalroz1 at gmx dot com> ---
> which would ignore all errors.

I meant "which would ignore all warnings" of course. Glad to have a dupe :-)