http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61126
--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Matthias Klose from comment #2)
> -Wunused-parameter is enabled by -Wall. I'm surprised that -Wextra is used
> without -Wall, but it happens in the testsuite in more places.
This is not what the documentation says:
@item -Wextra
@opindex @code{Wextra}
@cindex extra warnings
@cindex warnings, extra
Enables some warning options for usages of language features which
may be problematic. This currently includes @option{-Wcompare-reals}
and @option{-Wunused-parameter}.
