https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118673
--- Comment #22 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-14 branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:b4f66a79e0c9b65d78aed6c982bdcff48ed098d5 commit r14-11347-gb4f66a79e0c9b65d78aed6c982bdcff48ed098d5 Author: Jason Merrill <ja...@redhat.com> Date: Mon Jan 27 18:30:18 2025 -0500 c++: init-list opt and lvalue initializers [PR118673] When fn returns {extension}, the ArrayRef in the initializer_list is constructed to point to 'extension', the variable with static storage duration. The optimization was copying extension's value into a temporary array and constructing the ArrayRef to point to that temporary copy instead, resulting in a dangling pointer. So suppress this optimization if the element constructor takes a reference and the initializer is a non-mergeable lvalue. PR c++/118673 gcc/cp/ChangeLog: * call.cc (maybe_init_list_as_array): Check for lvalue initializers. * cp-tree.h (enum cp_lvalue_kind_flags): Add clk_mergeable. * tree.cc (lvalue_kind): Return it. (non_mergeable_glvalue_p): New. (test_lvalue_kind): Adjust. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/initlist-opt6.C: New test.
