[Bug c++/77321] New: [7 Regression] crash in warn_for_memset

["trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77321

            Bug ID: 77321
           Summary: [7 Regression] crash in warn_for_memset
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

markus@x4 /tmp % cat crash.ii
template <typename> void foo() {
  auto &a();
  __builtin_memset(a, 'X', 4);
}

markus@x4 /tmp % g++ -c -Wall crash.ii
crash.ii: In function ‘void foo()’:
crash.ii:3:29: internal compiler error: Segmentation fault
   __builtin_memset(a, 'X', 4);
                             ^
0xd7904f crash_signal
        ../../gcc/gcc/toplev.c:335
0x7f13dc06dc2f ???
       
/home/markus/glibc/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x8cc6ca warn_for_memset(unsigned int, tree_node*, tree_node*, int)
        ../../gcc/gcc/c-family/c-common.c:11994
0x75efcf cp_parser_postfix_expression
        ../../gcc/gcc/cp/parser.c:6878
0x75ceac cp_parser_unary_expression
        ../../gcc/gcc/cp/parser.c:8019
0x766e87 cp_parser_cast_expression
        ../../gcc/gcc/cp/parser.c:8696
0x76741d cp_parser_binary_expression
        ../../gcc/gcc/cp/parser.c:8797
0x767ce0 cp_parser_assignment_expression
        ../../gcc/gcc/cp/parser.c:9084
0x76a66a cp_parser_expression
        ../../gcc/gcc/cp/parser.c:9253
0x76ac13 cp_parser_expression_statement
        ../../gcc/gcc/cp/parser.c:10736
0x77a5cc cp_parser_statement
        ../../gcc/gcc/cp/parser.c:10587
0x77b664 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:10859
0x77b76f cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:10813
0x77b8cd cp_parser_function_body
        ../../gcc/gcc/cp/parser.c:20832
0x77b8cd cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/gcc/cp/parser.c:20868
0x77c381 cp_parser_function_definition_after_declarator
        ../../gcc/gcc/cp/parser.c:25565
0x77d131 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/gcc/cp/parser.c:25477
0x77d131 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:18603
0x77e5b7 cp_parser_single_declaration
        ../../gcc/gcc/cp/parser.c:26021
0x77e6dc cp_parser_template_declaration_after_parameters
        ../../gcc/gcc/cp/parser.c:25626
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