https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80652
--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> --- On Wed, 17 May 2017, paboyle at ph dot ed.ac.uk wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80652 > > --- Comment #6 from Peter Boyle <paboyle at ph dot ed.ac.uk> --- > Just a comment -- suggest a warning thrown if union access from > two views is made. AFAIK g++ is the only compiler not implementing the > defacto type pun use. > > http://en.cppreference.com/w/cpp/language/union > > "Many compilers implement, as a non-standard language extension, the ability > to > read inactive members of a union." > > i.e. warn on attempted use of the above behaviour. We do implement this if the access is through the union type.
