http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47700
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-02-11 17:12:07 UTC --- Try http://gcc.gnu.org/onlinedocs/gcc-4.5.2/gcc/C_002b_002b-Dialect-Options.html#index-Wno_002dold_002dstyle_002dcast-178 .