https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68880
Markus Trippelsdorf <trippels at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |trippels at gcc dot gnu.org Resolution|--- |INVALID --- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Yes, this invokes undefined behavior. See: http://en.cppreference.com/w/cpp/language/extending_std