https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101903
Bug ID: 101903 Summary: [9/10/11/12 Regression] ICE with invalid constexpr constructor in template class Product: gcc Version: 12.0 Status: UNCONFIRMED Keywords: error-recovery, ice-on-invalid-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 invalid code snippet triggers an ICE since GCC 7.1.0: =============================== template<int> struct A { int i{}; A(); constexpr A(int) : A() {} }; constexpr A<0> a{0}; =============================== bug.cc:9:19: error: 'constexpr A<<anonymous> >::A(int) [with int <anonymous> = 0]' called in a constant expression 9 | constexpr A<0> a{0}; | ^ bug.cc:6:13: note: 'constexpr A<<anonymous> >::A(int) [with int <anonymous> = 0]' is not usable as a 'constexpr' function because: 6 | constexpr A(int) : A() {} | ^ bug.cc:6:13: internal compiler error: in build_data_member_initialization, at cp/constexpr.c:400 0x66cf30 build_data_member_initialization ../../gcc/gcc/cp/constexpr.c:400 0x960432 build_constexpr_constructor_member_initializers ../../gcc/gcc/cp/constexpr.c:612 0x960432 massage_constexpr_body ../../gcc/gcc/cp/constexpr.c:738 0x96ce3d explain_invalid_constexpr_fn(tree_node*) ../../gcc/gcc/cp/constexpr.c:982 0x9621e1 cxx_eval_call_expression ../../gcc/gcc/cp/constexpr.c:2594 0x96543c cxx_eval_constant_expression ../../gcc/gcc/cp/constexpr.c:6269 0x968cc4 cxx_eval_outermost_constant_expr ../../gcc/gcc/cp/constexpr.c:7301 0x96da7e maybe_constant_init_1 ../../gcc/gcc/cp/constexpr.c:7756 0xb9902a store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>**, int) ../../gcc/gcc/cp/typeck2.c:777 0x9b4cc6 check_initializer ../../gcc/gcc/cp/decl.c:7185 0x9dab09 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int) ../../gcc/gcc/cp/decl.c:8119 0xac5174 cp_parser_init_declarator ../../gcc/gcc/cp/parser.c:22556 0xaa0773 cp_parser_simple_declaration ../../gcc/gcc/cp/parser.c:15088 0xacfdb5 cp_parser_declaration ../../gcc/gcc/cp/parser.c:14787 0xad078e cp_parser_toplevel_declaration ../../gcc/gcc/cp/parser.c:14808 0xad078e cp_parser_translation_unit ../../gcc/gcc/cp/parser.c:4978 0xad078e c_parse_file() ../../gcc/gcc/cp/parser.c:46558 0xbf924d c_common_parse_file() ../../gcc/gcc/c-family/c-opts.c:1223 Please submit a full bug report, [etc.]