https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114854
--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-13 branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:c2581c76c0738298d27b417067dfc2e500f5e21a commit r13-9302-gc2581c76c0738298d27b417067dfc2e500f5e21a Author: Marek Polacek <pola...@redhat.com> Date: Wed May 8 15:43:58 2024 -0400 c++: ICE with reference NSDMI [PR114854] Here we crash on a cp_gimplify_expr/TARGET_EXPR assert: /* A TARGET_EXPR that expresses direct-initialization should have been elided by cp_gimplify_init_expr. */ gcc_checking_assert (!TARGET_EXPR_DIRECT_INIT_P (*expr_p)); the TARGET_EXPR in question is created for the NSDMI in: class Vector { int m_size; }; struct S { const Vector &vec{}; }; where we first need to create a Vector{} temporary, and then bind the vec reference to it. The temporary is represented by a TARGET_EXPR and it cannot be elided. When we create an object of type S, we get D.2848 = {.vec=(const struct Vector &) &TARGET_EXPR <D.2840, {.m_size=0}>} where the TARGET_EXPR is no longer direct-initializing anything. Fixed by not setting TARGET_EXPR_DIRECT_INIT_P in convert_like_internal/ck_user. PR c++/114854 gcc/cp/ChangeLog: * call.cc (convert_like_internal) <case ck_user>: Don't set TARGET_EXPR_DIRECT_INIT_P. gcc/testsuite/ChangeLog: * g++.dg/cpp1y/nsdmi-aggr22.C: New test. (cherry picked from commit 1a05332bbac98a4c002bef3fb45a3ad9d56b3a71)
