[Bug c++/58704] New: [c++11] ICE initializing array member of template class

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58704

            Bug ID: 58704
           Summary: [c++11] ICE initializing array member of template
                    class
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org

The following valid code snippet (compiled with "-std=c++11") triggers an ICE
since GCC 4.7.0 (when non-static data member initializers were introduced):

=================================
struct A {};

template<typename> struct B
{
  A a[1] = {};
};

B<int> b;
=================================

bug.cc: In constructor 'constexpr B<int>::B()':
bug.cc:3:27: internal compiler error: tree check: expected tree that contains
'common' structure, have 'constructor' in perform_member_init, at cp/init.c:665
 template<typename> struct B
                           ^
0xd159c7 tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
        ../../gcc/gcc/tree.c:9472
0x6a3e2d contains_struct_check
        ../../gcc/gcc/tree.h:2788
0x6a3e2d perform_member_init
        ../../gcc/gcc/cp/init.c:665
0x6a3e2d emit_mem_initializers(tree_node*)
        ../../gcc/gcc/cp/init.c:1096
0x6acfae synthesize_method(tree_node*)
        ../../gcc/gcc/cp/method.c:796
0x61e379 mark_used(tree_node*, int)
        ../../gcc/gcc/cp/decl2.c:4778
0x54d0b6 build_over_call
        ../../gcc/gcc/cp/call.c:7116
0x548eae build_new_method_call_1
        ../../gcc/gcc/cp/call.c:7813
0x548eae build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
        ../../gcc/gcc/cp/call.c:7883
0x549e22 build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
        ../../gcc/gcc/cp/call.c:7440
0x69eba7 expand_default_init
        ../../gcc/gcc/cp/init.c:1668
0x69eba7 expand_aggr_init_1
        ../../gcc/gcc/cp/init.c:1769
0x6a1779 build_aggr_init(tree_node*, tree_node*, int, int)
        ../../gcc/gcc/cp/init.c:1520
0x55e005 build_aggr_init_full_exprs
        ../../gcc/gcc/cp/decl.c:5552
0x55e005 check_initializer
        ../../gcc/gcc/cp/decl.c:5687
0x570ccc cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/gcc/cp/decl.c:6356
0x65e7e7 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16633
0x65ff2f cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11047
0x643860 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:10928
0x66aaae cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:10825
Please submit a full bug report, [etc.]