[Bug c/63499] gcc treats unknown -Wno-xxx options differently than -Wxxx

[zbyszek at in dot waw.pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63499

--- Comment #2 from Zbigniew Jędrzejewski-Szmek <zbyszek at in dot waw.pl> ---
Ah, ok. Thanks.