https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70690
--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:bd95d75f3412e1a7debab7c6c602ba409f274eb5 commit r12-5254-gbd95d75f3412e1a7debab7c6c602ba409f274eb5 Author: Jason Merrill <ja...@redhat.com> Date: Thu Nov 11 22:03:53 2021 -0500 c++: c++20 constexpr default ctor and array init The implicit constexpr patch revealed that marking the constructor in the PR70690 testcase as constexpr made the bug reappear, because build_vec_init assumed that a constexpr default constructor initialized the whole object, so it was equivalent to value-initialization. But this is no longer true in C++20. PR c++/70690 gcc/cp/ChangeLog: * init.c (build_vec_init): Check default_init_uninitialized_part in C++20. gcc/testsuite/ChangeLog: * g++.dg/init/array41a.C: New test.
