https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113841
--- Comment #17 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:9357f7e0fbfbf0d7d5adb2cd1588a765f40b6162 commit r12-11042-g9357f7e0fbfbf0d7d5adb2cd1588a765f40b6162 Author: Jonathan Wakely <jwak...@redhat.com> Date: Fri Feb 9 17:06:20 2024 +0000 libstdc++: Constrain std::vector default constructor [PR113841] This is needed to avoid errors outside the immediate context when evaluating is_default_constructible_v<vector<T, A>> when A is not default constructible. To avoid diagnostic regressions for 23_containers/vector/48101_neg.cc we need to make the std::allocator<cv T> partial specializations default constructible, which they probably should have been anyway. libstdc++-v3/ChangeLog: PR libstdc++/113841 * include/bits/allocator.h (allocator<cv T>): Add default constructor to partial specializations for cv-qualified types. * include/bits/stl_vector.h (_Vector_impl::_Vector_impl()): Constrain so that it's only present if the allocator is default constructible. * include/bits/stl_bvector.h (_Bvector_impl::_Bvector_impl()): Likewise. * testsuite/23_containers/vector/cons/113841.cc: New test. (cherry picked from commit 142cc4c223d695e515ed2504501b91d8a7ac6eb8)
