https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92505
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:7107ea6fb933f1e928593c7e92edfd64ccf0df63 commit r13-2701-g7107ea6fb933f1e928593c7e92edfd64ccf0df63 Author: Patrick Palka <ppa...@redhat.com> Date: Fri Sep 16 11:10:43 2022 -0400 c++: 'mutable' member within constexpr [PR92505] This patch permits accessing 'mutable' members of local objects during constexpr evaluation, while continuing to reject it for global objects (as in the last line of cpp0x/constexpr-mutable1.C). To distinguish between the two cases, it looks like it suffices to just check CONSTRUCTOR_MUTABLE_POSION in cxx_eval_component_reference before deciding to reject a DECL_MUTABLE_P member access. PR c++/92505 gcc/cp/ChangeLog: * constexpr.cc (cxx_eval_component_reference): Check non_constant_p sooner. In C++14 or later, reject a DECL_MUTABLE_P member access only if CONSTRUCTOR_MUTABLE_POISION is also set. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/constexpr-mutable3.C: New test. * g++.dg/cpp1y/constexpr-mutable1.C: New test.
