https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95164
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:f63831405a32287dea2862ce3663675cc5b55180 commit r10-8723-gf63831405a32287dea2862ce3663675cc5b55180 Author: Marek Polacek <pola...@redhat.com> Date: Fri Sep 4 16:04:26 2020 -0400 c++: Fix ICE in reshape_init with init-list [PR95164] This patch fixes a long-standing bug in reshape_init_r. Since r209314 we implement DR 1467 which handles list-initialization with a single initializer of the same type as the target. In this test this causes a crash in reshape_init_r when we're processing a constructor that has undergone the DR 1467 transformation. Take e.g. the foo({{1, {H{k}}}}); line in the attached test. {H{k}} initializes the field b of H in I. H{k} is a functional cast, so has TREE_HAS_CONSTRUCTOR set, so is COMPOUND_LITERAL_P. We perform the DR 1467 transformation and turn {H{k}} into H{k}. Then we attempt to reshape H{k} again and since first_initializer_p is null and it's COMPOUND_LITERAL_P, we go here: else if (COMPOUND_LITERAL_P (stripped_init)) gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init)); then complain about the missing braces, go to reshape_init_class and ICE on gcc_checking_assert (d->cur->index == get_class_binding (type, id)); because due to the missing { } we're looking for 'b' in H, but that's not found. So we have to be prepared to handle an initializer whose outer braces have been removed due to DR 1467. gcc/cp/ChangeLog: PR c++/95164 * decl.c (reshape_init_r): When initializing an aggregate member with an initializer from an initializer-list, also consider COMPOUND_LITERAL_P. gcc/testsuite/ChangeLog: PR c++/95164 * g++.dg/cpp0x/initlist123.C: New test. (cherry picked from commit acbe30bbc884899da72df47d023ebde89f8f47f1)
