https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95159
Bug ID: 95159
Summary: ICE on aggregate template parameter with empty angle
brackets
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: pacoarjonilla at yahoo dot es
Target Milestone: ---
The following snippet triggers an ICE when compiled with --std=c++20 on GCC
10.0.1
>>>>>>>>>>>>>>>
template <int L> struct A {
A(const char (&)[L]) { }
};
template <A a> struct B { };
template <A a> void fu(B<a<>>) { }
>>>>>>>>>>>>>>>
Compiler output:
bug.cc:7:27: internal compiler error: Segmentation fault
7 | template <A a> void fu(B<a<>>) { }
| ^
0xc4dc7f crash_signal
/home/paco/git/gcc/gcc/toplev.c:328
0x62e613 resolve_args(vec<tree_node*, va_gc, vl_embed>*, int)
/home/paco/git/gcc/gcc/cp/call.c:4455
0x743b6e do_class_deduction
/home/paco/git/gcc/gcc/cp/pt.c:28787
0x743b6e do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
/home/paco/git/gcc/gcc/cp/pt.c:28920
0x744ff2 convert_template_argument
/home/paco/git/gcc/gcc/cp/pt.c:8395
0x757e9f convert_template_argument
/home/paco/git/gcc/gcc/cp/pt.c:8168
0x757e9f coerce_template_parms
/home/paco/git/gcc/gcc/cp/pt.c:8899
0x75a681 lookup_template_class_1
/home/paco/git/gcc/gcc/cp/pt.c:9737
0x75b8cc lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
/home/paco/git/gcc/gcc/cp/pt.c:10109
0x77808d finish_template_type(tree_node*, tree_node*, int)
/home/paco/git/gcc/gcc/cp/semantics.c:3408
0x71fbdd cp_parser_template_id
/home/paco/git/gcc/gcc/cp/parser.c:16734
0x71fe4c cp_parser_class_name
/home/paco/git/gcc/gcc/cp/parser.c:23697
0x71cb81 cp_parser_qualifying_entity
/home/paco/git/gcc/gcc/cp/parser.c:6776
0x71cb81 cp_parser_nested_name_specifier_opt
/home/paco/git/gcc/gcc/cp/parser.c:6458
0x724126 cp_parser_simple_type_specifier
/home/paco/git/gcc/gcc/cp/parser.c:18129
0x70ae9d cp_parser_type_specifier
/home/paco/git/gcc/gcc/cp/parser.c:17787
0x70be76 cp_parser_decl_specifier_seq
/home/paco/git/gcc/gcc/cp/parser.c:14359
0x726dda cp_parser_parameter_declaration
/home/paco/git/gcc/gcc/cp/parser.c:22765
0x7276fa cp_parser_parameter_declaration_list
/home/paco/git/gcc/gcc/cp/parser.c:22588
0x727a65 cp_parser_parameter_declaration_clause
/home/paco/git/gcc/gcc/cp/parser.c:22515
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
