[Bug c++/60227] New: [4.7/4.8/4.9 Regression] [C++11] ICE using brace-enclosed initializer list to initialize array

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60227

            Bug ID: 60227
           Summary: [4.7/4.8/4.9 Regression] [C++11] ICE using
                    brace-enclosed initializer list to initialize array
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org

The following invalid code snippet (compiled with "-std=c++11")
triggers an ICE since GCC 4.6.1:

=======================================================
void foo(int n)
{
  int a[n];
  int (&r)[n] = {};
}
=======================================================

bug.cc: In function 'void foo(int)':
bug.cc:4:18: internal compiler error: in tree_to_uhwi, at tree.c:7024
   int (&r)[n] = {};
                  ^
0xdc009c tree_to_uhwi(tree_node const*)
        ../../gcc/gcc/tree.c:7024
0x5ab42e build_array_conv
        ../../gcc/gcc/cp/call.c:953
0x5ab42e implicit_conversion
        ../../gcc/gcc/cp/call.c:1772
0x5ac526 reference_binding
        ../../gcc/gcc/cp/call.c:1490
0x5b787c initialize_reference(tree_node*, tree_node*, int, int)
        ../../gcc/gcc/cp/call.c:9377
0x5c787b grok_reference_init
        ../../gcc/gcc/cp/decl.c:4809
0x5c787b check_initializer
        ../../gcc/gcc/cp/decl.c:5676
0x5d99fc cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/gcc/cp/decl.c:6396
0x6c81bd cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16815
0x6c9979 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11205
0x6acc63 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:11086
0x6add81 cp_parser_declaration_statement
        ../../gcc/gcc/cp/parser.c:10733
0x6ae3cb cp_parser_statement
        ../../gcc/gcc/cp/parser.c:9467
0x6af1b9 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:9745
0x6af326 cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:9699
0x6c34fb cp_parser_function_body
        ../../gcc/gcc/cp/parser.c:18641
0x6c34fb cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/gcc/cp/parser.c:18677
0x6c7842 cp_parser_function_definition_after_declarator
        ../../gcc/gcc/cp/parser.c:22792
0x6c86e1 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/gcc/cp/parser.c:22704
0x6c86e1 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16585
Please submit a full bug report, [etc.]