https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70254
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler@googlemail.
| |com
--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The following code:
//---------------
template<typename Creator>
class NamedResourceFactory
{
using ResourceType = decltype(Creator())::type::pointer;
};
int main(){}
//---------------
compiled against gcc 4.9.0, 5.1.0, 5.2.0 results in the following output:
<quote>
prog.cc:4:26: internal compiler error: Segmentation fault
using ResourceType = decltype(Creator())::type::pointer;
^
0x94d21f crash_signal
../../gcc-4.9.0/gcc/toplev.c:337
0x56c94a resolve_typename_type(tree_node*, bool)
../../gcc-4.9.0/gcc/cp/pt.c:21385
0x5b1c01 cp_parser_nested_name_specifier_opt
../../gcc-4.9.0/gcc/cp/parser.c:5188
0x5bcc13 cp_parser_id_expression
../../gcc-4.9.0/gcc/cp/parser.c:4713
0x5bd5ff cp_parser_parse_and_diagnose_invalid_type_name
../../gcc-4.9.0/gcc/cp/parser.c:3024
0x5aa3e7 cp_parser_type_specifier_seq
../../gcc-4.9.0/gcc/cp/parser.c:18139
0x5ba452 cp_parser_type_id_1
../../gcc-4.9.0/gcc/cp/parser.c:18000
0x5bf069 cp_parser_type_id
../../gcc-4.9.0/gcc/cp/parser.c:18040
0x5bf069 cp_parser_alias_declaration
../../gcc-4.9.0/gcc/cp/parser.c:16135
0x5a43a5 cp_parser_member_declaration
../../gcc-4.9.0/gcc/cp/parser.c:20186
0x5a7f50 cp_parser_member_specification_opt
../../gcc-4.9.0/gcc/cp/parser.c:20093
0x5a7f50 cp_parser_class_specifier_1
../../gcc-4.9.0/gcc/cp/parser.c:19321
0x5a7f50 cp_parser_class_specifier
../../gcc-4.9.0/gcc/cp/parser.c:19548
0x5a7f50 cp_parser_type_specifier
../../gcc-4.9.0/gcc/cp/parser.c:14337
0x5be620 cp_parser_decl_specifier_seq
../../gcc-4.9.0/gcc/cp/parser.c:11573
0x5c2d63 cp_parser_single_declaration
../../gcc-4.9.0/gcc/cp/parser.c:23159
0x5c3224 cp_parser_template_declaration_after_export
../../gcc-4.9.0/gcc/cp/parser.c:23035
0x5cb639 cp_parser_declaration
../../gcc-4.9.0/gcc/cp/parser.c:10973
0x5ca1a8 cp_parser_declaration_seq_opt
../../gcc-4.9.0/gcc/cp/parser.c:10895
0x5cb9aa cp_parser_translation_unit
../../gcc-4.9.0/gcc/cp/parser.c:4030
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
1
Finish
</quote>
The problem seems to be fixed in the current head (Tested: gcc HEAD 6.0.0
20160311 (experimental)), where the normal compiler diagnostics is produced:
<quote>
prog.cc:4:26: error: need 'typename' before 'typename decltype
(Creator())::type::pointer' because 'typename decltype (Creator())::type' is a
dependent scope
using ResourceType = decltype(Creator())::type::pointer;
</quote>
