http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52946
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |manu at gcc dot gnu.org Resolution| |INVALID --- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-04-12 18:39:56 UTC --- Which means that this is a proprietary non-portable extension by Apple. It doesn't work with other compilers except Apple's. You should really not use it.