http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47822
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-02-20 15:33:56 UTC --- It will show on all targets without a builtin_decl hook and target builtins. x86 is no such target, it shows there because of the darwin builtin not playing by the rules. I will fix (hide) the issue again, but it will (re-)cause decls of builtins not to appear in gdb. Thus, void *malloc(long); int main() {} and you'll not be able to (gdb) ptype malloc. Thus, darwin people - if you continue to let this kind of hacks sneak in, then, well, you will continuously get beaten by this kind of problems. If it "works" it doesn't mean its right.