[Bug c++/104668] New: [12 Regression] ICE in lookup_attribute_spec, at attribs.cc:425

["gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104668

            Bug ID: 104668
           Summary: [12 Regression] ICE in lookup_attribute_spec, at
                    attribs.cc:425
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Started between 20220123 and 20220130 :
(derived from g++.dg/cpp0x/lambda/lambda-variadic15.C)


$ cat z1.cc
template <class... Ts>
void sink(Ts...);
template <class... Ts>
void f(Ts...) {
  sink([] { struct alignas:Ts) S {}; }...); }
}
int main() {
  f(0);
}


$ g++-12-20220220 -c z1.cc
z1.cc: In lambda function:
z1.cc:5:20: internal compiler error: Segmentation fault
    5 |   sink([] { struct alignas:Ts) S {}; }...); }
      |                    ^~~~~~~
0xda25ef crash_signal
        ../../gcc/toplev.cc:322
0x89f4f1 lookup_attribute_spec(tree_node const*)
        ../../gcc/attribs.cc:425
0x75217e is_late_template_attribute
        ../../gcc/cp/decl2.cc:1243
0x75217e splice_template_attributes(tree_node**, tree_node*)
        ../../gcc/cp/decl2.cc:1340
0x752b1e cplus_decl_attributes(tree_node**, tree_node*, int)
        ../../gcc/cp/decl2.cc:1662
0x7eabc8 cp_parser_class_head
        ../../gcc/cp/parser.cc:26646
0x7eabc8 cp_parser_class_specifier_1
        ../../gcc/cp/parser.cc:25824
0x7eb670 cp_parser_class_specifier
        ../../gcc/cp/parser.cc:26204
0x7eb670 cp_parser_type_specifier
        ../../gcc/cp/parser.cc:19348
0x7ec1a6 cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.cc:15911
0x7ecd61 cp_parser_simple_declaration
        ../../gcc/cp/parser.cc:15159
0x7ee769 cp_parser_declaration_statement
        ../../gcc/cp/parser.cc:14367
0x7eed6b cp_parser_statement
        ../../gcc/cp/parser.cc:12452
0x7efcb4 cp_parser_statement_seq_opt
        ../../gcc/cp/parser.cc:12856
0x7efd6f cp_parser_compound_statement
        ../../gcc/cp/parser.cc:12808
0x7f0778 cp_parser_function_body
        ../../gcc/cp/parser.cc:25062
0x7f0778 cp_parser_lambda_body
        ../../gcc/cp/parser.cc:11799
0x7f0778 cp_parser_lambda_expression
        ../../gcc/cp/parser.cc:11118
0x7f0778 cp_parser_primary_expression
        ../../gcc/cp/parser.cc:5700
0x7f3725 cp_parser_postfix_expression
        ../../gcc/cp/parser.cc:7652