On Sun, Sep 18, 2005 at 06:54:26PM +0200, Florian Weimer wrote: > * Tommy Vercetti: > > >> The warning is controlled by -Wsign-compare, which is turned on by > >> -Wextra (also known as -W) but not by -Wall. It's not turned on by > >> -Wall because it is not normally a problem. > > > That's strange, all users I know expected it to turn ALL warnings, > > hence name. > > Some people claim it's a homage to Larry Wall, inventor of Perl.
Generally speaking, we want -Wall to be safe to use. gcc has some warnings that can't be silenced without making correct programs worse (-Weffc++ comes to mind); these are not included in -Wall. In that sense, -Wall effectively means "all the warnings we recommend that you use". Some people might want to argue with this, but that is the practical effect.
