https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115207
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:2d7a0d38e2f8e281ab2269cfe6c048410fa3c886 commit r16-357-g2d7a0d38e2f8e281ab2269cfe6c048410fa3c886 Author: Jason Merrill <ja...@redhat.com> Date: Fri May 2 08:35:38 2025 -0400 c++: CTAD and constexpr ctor [PR115207] Here we failed to constant-evaluate the A<int> constructor because DECL_SIZE wasn't set on 'a' yet, so compare_address thinks we can't be sure it isn't at the same address as 'i'. Normally DECL_SIZE is set by build_decl calling layout_decl, but that doesn't happen here because we don't have a type yet. So we need to layout_decl again after deduction. PR c++/115207 gcc/cp/ChangeLog: * decl.cc (cp_finish_decl): Call layout_decl after CTAD. gcc/testsuite/ChangeLog: * g++.dg/cpp1z/class-deduction118.C: New test.
