https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89336
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Author: jakub Date: Wed Feb 20 21:16:27 2019 New Revision: 269052 URL: https://gcc.gnu.org/viewcvs?rev=269052&root=gcc&view=rev Log: PR c++/89336 * constexpr.c (cxx_eval_store_expression): Diagnose changing of active union member for -std=c++17 and earlier. * g++.dg/cpp1y/constexpr-89336-3.C: New test. Added: trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-89336-3.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/constexpr.c trunk/gcc/testsuite/ChangeLog