https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881
Bug ID: 101881 Summary: [9/10/11/12 Regression] ICE with vector type in template alias Product: gcc Version: 12.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: reichelt at gcc dot gnu.org Target Milestone: --- The following valid code snippet triggers an ICE since GCC 7.1.0: ================================================================= template<int N> using A = int __attribute__((vector_size(N)))*; void foo(A<4>) {} ================================================================= bug.cc:3:6: internal compiler error: in add_substitution, at cp/mangle.c:462 void foo(A<4>) {} ^~~ 0x8014a5 add_substitution ../../gcc-7.5.0/gcc/cp/mangle.c:461 0x7fa97b write_type ../../gcc-7.5.0/gcc/cp/mangle.c:2413 0x7fd114 write_method_parms ../../gcc-7.5.0/gcc/cp/mangle.c:2828 0x7fd3f6 write_bare_function_type ../../gcc-7.5.0/gcc/cp/mangle.c:2764 0x80505c mangle_decl_string ../../gcc-7.5.0/gcc/cp/mangle.c:3821 0x8053c3 get_mangled_id ../../gcc-7.5.0/gcc/cp/mangle.c:3843 0x8053c3 mangle_decl(tree_node*) ../../gcc-7.5.0/gcc/cp/mangle.c:3913 0x102833e decl_assembler_name(tree_node*) ../../gcc-7.5.0/gcc/tree.c:671 0x1077ac7 notice_global_symbol(tree_node*) ../../gcc-7.5.0/gcc/varasm.c:1656 0x96fdd9 cgraph_node::finalize_function(tree_node*, bool) ../../gcc-7.5.0/gcc/cgraphunit.c:442 0x7b5e9f expand_or_defer_fn(tree_node*) ../../gcc-7.5.0/gcc/cp/semantics.c:4321 0x74a3a9 cp_parser_function_definition_after_declarator ../../gcc-7.5.0/gcc/cp/parser.c:26468 0x74b07e cp_parser_function_definition_from_specifiers_and_declarator ../../gcc-7.5.0/gcc/cp/parser.c:26371 0x74b07e cp_parser_init_declarator ../../gcc-7.5.0/gcc/cp/parser.c:19353 0x745e3c cp_parser_simple_declaration ../../gcc-7.5.0/gcc/cp/parser.c:12886 0x746d77 cp_parser_block_declaration ../../gcc-7.5.0/gcc/cp/parser.c:12711 0x7511e4 cp_parser_declaration ../../gcc-7.5.0/gcc/cp/parser.c:12609 0x75161b cp_parser_declaration_seq_opt ../../gcc-7.5.0/gcc/cp/parser.c:12485 0x751902 cp_parser_translation_unit ../../gcc-7.5.0/gcc/cp/parser.c:4368 0x751902 c_parse_file() ../../gcc-7.5.0/gcc/cp/parser.c:38643 Please submit a full bug report, [etc.] This is related to PR 83997, but without -flto. And we have a regression.