https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71220
Bug ID: 71220
Summary: ICE on instantiation using variadic template
Product: gcc
Version: 6.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rippey.e at gmail dot com
Target Milestone: ---
Running g++ 6.1.0 on the following code:
struct S1{};
template<typename,typename>
template<typename...>
using U=S1;
template<typename>
struct S2{
template<typename,typename=U<>>
struct S3;
S3<S1>
};
produces this error message:
a1.cpp:11:7: internal compiler error: Segmentation fault
S3<S1>
^
0xaf5d8f crash_signal
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/toplev.c:333
0x63d839 tsubst(tree_node*, tree_node*, int, tree_node*)
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:12968
0x643f42 tsubst_template_args
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:11221
0x644042 tsubst_template_args
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:11181
0x63d969 tsubst(tree_node*, tree_node*, int, tree_node*)
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:13218
0x63de32 tsubst(tree_node*, tree_node*, int, tree_node*)
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:12841
0x643674 coerce_template_parms
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:7687
0x643def coerce_innermost_template_parms
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:7803
0x644849 lookup_template_class_1
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:8294
0x644849 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/pt.c:8638
0x6db2fd finish_template_type(tree_node*, tree_node*, int)
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/semantics.c:3154
0x69a316 cp_parser_template_id
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:14914
0x69a48b cp_parser_class_name
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:21201
0x68e3b9 cp_parser_qualifying_entity
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:6237
0x68e3b9 cp_parser_nested_name_specifier_opt
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:5923
0x69bd1f cp_parser_nested_name_specifier
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:6167
0x69bd1f cp_parser_using_declaration
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:17743
0x6a67d7 cp_parser_member_declaration
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:22294
0x6892a1 cp_parser_member_specification_opt
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:22154
0x6892a1 cp_parser_class_specifier_1
/disk/0/erippey/gcc/objdir/../gcc-6.1.0/gcc/cp/parser.c:21346
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Please include the complete backtrace with any bug report.
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