With gcc 4.9.2 or 4.9.1 running: g++ --std=c++11 ch3.cpp with the contents of ch3.cpp being: "template<typename T> class C{ T t; decltype(t)::a::" will produce: ch3.cpp:4:2: internal compiler error: Segmentation fault decltype(t)::a:: ^ 0x91b6df crash_signal ../../gcc-4.9.2/gcc/toplev.c:337 0x532c2a resolve_typename_type(tree_node*, bool) ../../gcc-4.9.2/gcc/cp/pt.c:21479 0x576cb1 cp_parser_nested_name_specifier_opt ../../gcc-4.9.2/gcc/cp/parser.c:5186 0x574343 cp_parser_id_expression ../../gcc-4.9.2/gcc/cp/parser.c:4711 0x57454f cp_parser_parse_and_diagnose_invalid_type_name ../../gcc-4.9.2/gcc/cp/parser.c:3024 0x58fa44 cp_parser_member_declaration ../../gcc-4.9.2/gcc/cp/parser.c:20256 0x571460 cp_parser_member_specification_opt ../../gcc-4.9.2/gcc/cp/parser.c:20108 0x571460 cp_parser_class_specifier_1 ../../gcc-4.9.2/gcc/cp/parser.c:19336 0x571460 cp_parser_class_specifier ../../gcc-4.9.2/gcc/cp/parser.c:19563 0x571460 cp_parser_type_specifier ../../gcc-4.9.2/gcc/cp/parser.c:14339 0x582a60 cp_parser_decl_specifier_seq ../../gcc-4.9.2/gcc/cp/parser.c:11575 0x58e2b3 cp_parser_single_declaration ../../gcc-4.9.2/gcc/cp/parser.c:23181 0x58e774 cp_parser_template_declaration_after_export ../../gcc-4.9.2/gcc/cp/parser.c:23050 0x592389 cp_parser_declaration ../../gcc-4.9.2/gcc/cp/parser.c:10975 0x590ef8 cp_parser_declaration_seq_opt ../../gcc-4.9.2/gcc/cp/parser.c:10897 0x5926fa cp_parser_translation_unit ../../gcc-4.9.2/gcc/cp/parser.c:4028 0x5926fa c_parse_file() ../../gcc-4.9.2/gcc/cp/parser.c:31701 0x63ab23 c_common_parse_file() ../../gcc-4.9.2/gcc/c-family/c-opts.c:1067 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. /disk/0/erippey/series2_we_qa/csrc/reduce>g++ --version g++ (GCC) 4.9.2 Copyright (C) 2014 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Obviously this example is not valid C++. It was arrived at by taking a much longer program which was believed to be valid C++ and removing parts without regard to validity.
Confirmed.; still ICEs as of today.
Tried with gcc 5.2.0. Same result (modulo line #'s, etc.)
Mine.
Author: paolo Date: Sat Aug 22 17:44:46 2015 New Revision: 227098 URL: https://gcc.gnu.org/viewcvs?rev=227098&root=gcc&view=rev Log: /cp 2015-08-22 Paolo Carlini <paolo.carlini@oracle.com> PR c++/63693 * pt.c (resolve_typename_type): Use CLASSTYPE_PRIMARY_TEMPLATE_TYPE only on class types. /testsuite 2015-08-22 Paolo Carlini <paolo.carlini@oracle.com> PR c++/63693 * g++.dg/cpp0x/decltype63.C: New. Added: trunk/gcc/testsuite/g++.dg/cpp0x/decltype63.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/pt.c trunk/gcc/testsuite/ChangeLog
Fixed.
Just stumbled upon this ICE in my code on GCC 5.2.1: $ cat ice.i template<typename T> void foo(T obj) { using local_type = decltype(obj)::element_type::other_type } Do I understand it correctly that this will only be fixed for GCC 6.x, and not for GCC 4.x/5.x? Many thanks!
*** Bug 70254 has been marked as a duplicate of this bug. ***
So, not going to be backported to 5.x?