https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105191
--- Comment #2 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:4822108e61ab879067482704f2f7d1670813d61a commit r12-8066-g4822108e61ab879067482704f2f7d1670813d61a Author: Jason Merrill <ja...@redhat.com> Date: Fri Apr 8 15:33:41 2022 -0400 c++: constexpr non-trivial aggregate init [PR105191] My patch for PR92385 made us use VEC_INIT_EXPR for aggregate initialization of an array where some elements are not explicitly initialized. Constexpr handling of that was treating initialization from {} as equivalent to value-initialization, which is problematic for classes with default member initializers that make the default constructor non-trivial; in older standard modes, not initializing all members makes a constructor non-constexpr, but aggregate initialization is fine. PR c++/105191 PR c++/92385 gcc/cp/ChangeLog: * tree.cc (build_vec_init_elt): Do {}-init for aggregates. * constexpr.cc (cxx_eval_vec_init): Only treat {} as value-init for non-aggregate types. (build_vec_init_expr): Also check constancy of explicit initializer elements. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/constexpr-array28.C: New test.
