[Bug c++/79657] New: ICE on invalid c++ code in finish_underlying_type cp/semantics.c:3849

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79657

            Bug ID: 79657
           Summary: ICE on invalid c++ code in finish_underlying_type
                    cp/semantics.c:3849
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---

Adopted from clang:

$ g++
/home/marxin/BIG/Programming/llvm-project/llvm/tools/clang/test/SemaCXX/underlying_type.cp

...

/home/marxin/BIG/Programming/llvm-project/llvm/tools/clang/test/SemaCXX/underlying_type.cpp:53:29:
internal compiler error: Segmentation fault
     a = (__underlying_type(E)){}
                             ^
0x11cc42a crash_signal
        ../../gcc/toplev.c:337
0x80d55e tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        ../../gcc/tree.h:3186
0xa5a5aa finish_underlying_type(tree_node*)
        ../../gcc/cp/semantics.c:3849
0x996185 cp_parser_trait_expr
        ../../gcc/cp/parser.c:9747
0x9a36d6 cp_parser_simple_type_specifier
        ../../gcc/cp/parser.c:16753
0x9a304b cp_parser_type_specifier
        ../../gcc/cp/parser.c:16519
0x9aba9b cp_parser_type_specifier_seq
        ../../gcc/cp/parser.c:20804
0x9ab5cd cp_parser_type_id_1
        ../../gcc/cp/parser.c:20647
0x9ab915 cp_parser_type_id
        ../../gcc/cp/parser.c:20715
0x98fc43 cp_parser_postfix_expression
        ../../gcc/cp/parser.c:6728
0x9935b1 cp_parser_unary_expression
        ../../gcc/cp/parser.c:8125
0x9943e3 cp_parser_cast_expression
        ../../gcc/cp/parser.c:8802
0x9944d3 cp_parser_binary_expression
        ../../gcc/cp/parser.c:8903
0x9951ee cp_parser_assignment_expression
        ../../gcc/cp/parser.c:9190
0x995949 cp_parser_constant_expression
        ../../gcc/cp/parser.c:9460
0x9a6277 cp_parser_enumerator_definition
        ../../gcc/cp/parser.c:18081
0x9a6133 cp_parser_enumerator_list
        ../../gcc/cp/parser.c:18021
0x9a5ed0 cp_parser_enum_specifier
        ../../gcc/cp/parser.c:17948
0x9a2e5b cp_parser_type_specifier
        ../../gcc/cp/parser.c:16413
0x99dd17 cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.c:13352