https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114114
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:dc6c3bfb59baab28b998e18396c06087b6d9b0ed commit r14-9339-gdc6c3bfb59baab28b998e18396c06087b6d9b0ed Author: Marek Polacek <pola...@redhat.com> Date: Tue Mar 5 13:33:10 2024 -0500 c++: ICE with noexcept and local specialization [PR114114] Here we ICE because we call register_local_specialization while local_specializations is null, so local_specializations->put (); crashes on null this. It's null since maybe_instantiate_noexcept calls push_to_top_level which creates a new scope. Normally, I would have guessed that we need a new local_specialization_stack. But here we're dealing with an operand of a noexcept, which is an unevaluated operand, and those aren't registered in the hash map. maybe_instantiate_noexcept wasn't signalling that it's substituting an unevaluated operand though. PR c++/114114 gcc/cp/ChangeLog: * pt.cc (maybe_instantiate_noexcept): Save/restore cp_unevaluated_operand, c_inhibit_evaluation_warnings, and cp_noexcept_operand around the tsubst_expr call. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/noexcept84.C: New test.
