It is intended that -Wall over-ride specific flags?

[Bruce Korb]

Hi,

This command:

    gcc -Wno-format-contains-nul -Wall -Werror

falls over if a format string contains a nul byte.
I think it should not.  There needs to be a way for
collective warning options (e.g. "-Wall") to skip
over anything set by a more specific option.
("format-contains-nul" being fairly specific.)

If agreed, I'll supply some patch when I find that
round tuit I misplaced.

Thanks - Bruce