[Bug driver/52863] Enable -Wall by default

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52863

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2012-04-04 12:09:21 UTC ---
(1) WTF?
(2) Please don't.