http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56577
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-11 10:32:17 UTC --- (In reply to comment #2) > You cannot use union to avoid aliasing rules for normal accesses. Though some people may read the C standard as allowing this (even just creating a union type of int and long makes all accesses to int and long alias). ISTR some defect reports for this as well. That said, GCC certainly interprets the C standard and implements it like Jakub and Andrew said (and we won't change that). Use -fno-strict-aliasing if you are not happy with that.
