http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51625
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-12-30 06:16:22 UTC --- I don't we (GCC) want -Wconversion turned on by -Wall or by default. See http://gcc.gnu.org/wiki/NewWconversion .