https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85242
Bug ID: 85242
Summary: [6/7/8 Regression] ICE with invalid template parameter
Product: gcc
Version: 8.0
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
Target Milestone: ---
The following invalid code snippet triggers an ICE on trunk since GCC 6.1.0:
==========================================
namespace N
{
struct A {};
}
template<struct N::A {}> void foo();
==========================================
'
in dump_template_decl, at cp/error.c:1305
template<struct N::A {}> void foo();
^
0x7163e0 dump_template_decl
../../gcc-6.1.0/gcc/cp/error.c:1305
0x718bf2 decl_to_string
../../gcc-6.1.0/gcc/cp/error.c:2955
0x718bf2 cp_printer
../../gcc-6.1.0/gcc/cp/error.c:3535
0x14b50b8 pp_format(pretty_printer*, text_info*)
../../gcc-6.1.0/gcc/pretty-print.c:631
0x14b0928 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)
../../gcc-6.1.0/gcc/diagnostic.c:823
0x14b17ed error(char const*, ...)
../../gcc-6.1.0/gcc/diagnostic.c:1152
0x644646 duplicate_decls(tree_node*, tree_node*, bool)
../../gcc-6.1.0/gcc/cp/decl.c:1609
0x81664c pushdecl_maybe_friend_1
../../gcc-6.1.0/gcc/cp/name-lookup.c:805
0x81664c pushdecl_maybe_friend(tree_node*, bool)
../../gcc-6.1.0/gcc/cp/name-lookup.c:1298
0x819753 pushdecl_with_scope_1
../../gcc-6.1.0/gcc/cp/name-lookup.c:2295
0x81983c pushdecl_with_scope(tree_node*, cp_binding_level*, bool)
../../gcc-6.1.0/gcc/cp/name-lookup.c:2309
0x8198ef pushdecl_namespace_level(tree_node*, bool)
../../gcc-6.1.0/gcc/cp/name-lookup.c:3915
0x6b5e30 push_template_decl_real(tree_node*, bool)
../../gcc-6.1.0/gcc/cp/pt.c:5392
0x72f2da cp_parser_class_head
../../gcc-6.1.0/gcc/cp/parser.c:21951
0x72f2da cp_parser_class_specifier_1
../../gcc-6.1.0/gcc/cp/parser.c:21285
0x72f2da cp_parser_class_specifier
../../gcc-6.1.0/gcc/cp/parser.c:21582
0x72f2da cp_parser_type_specifier
../../gcc-6.1.0/gcc/cp/parser.c:15836
0x743571 cp_parser_decl_specifier_seq
../../gcc-6.1.0/gcc/cp/parser.c:12760
0x7451e6 cp_parser_parameter_declaration
../../gcc-6.1.0/gcc/cp/parser.c:20437
0x7467e9 cp_parser_template_parameter
../../gcc-6.1.0/gcc/cp/parser.c:14543
Please submit a full bug report, [etc.]
Note that the compiler even fails to properly emit the
"internal compiler error" message.
GCC 4.4 - GCC 5 wrongly accepted the code.
