https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44677
--- Comment #30 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Vincent Lefèvre from comment #28)
> It seems that to get -Wunused-but-set-parameter=3 implicitly, one needs
> -Wextra (contrary to -Wunused-but-set-variable=3). So the condition
>
> -Wunused or -Wall or -Wunused -Wextra or -Wall -Wextra
>
> (which includes the -Wunused alone) seems to be valid only for the
> unused-but-set-variable case.
Sure, -Wunused-but-set-parameter* has always been only with -Wunused -Wextra
(where -Wunused is enabled by -Wall), while -Wunused-but-set-variable* just by
-Wunused.
Nothing changed on that.
The docs document that:
This @option{-Wunused-but-set-parameter=3} warning is also enabled by
@option{-Wunused} together with @option{-Wextra}.
vs.
This @option{-Wunused-but-set-variable=3} warning is also enabled by
@option{-Wunused}, which is enabled by @option{-Wall}.
