https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85227
Bug ID: 85227
Summary: ICE with structured binding of a forward declared
variable
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 (compiled with "-std=c++17") triggers
an ICE since GCC 7.1.0 (when structured bindings were introduced):
===============================
extern struct A a;
template<int> void foo()
{
auto[i] = a;
}
===============================
bug.cc: In function 'void foo()':
bug.cc:5:13: internal compiler error: Segmentation fault
auto[i] = a;
^
0xebd2ff crash_signal
../../gcc/gcc/toplev.c:325
0x881861 tree_check(tree_node*, char const*, int, char const*, tree_code)
../../gcc/gcc/tree.h:3134
0x881861 find_decomp_class_base
../../gcc/gcc/cp/decl.c:7344
0x8a3ec4 cp_finish_decomp(tree_node*, tree_node*, unsigned int)
../../gcc/gcc/cp/decl.c:7733
0x944963 cp_parser_decomposition_declaration
../../gcc/gcc/cp/parser.c:13336
0x944963 cp_parser_simple_declaration
../../gcc/gcc/cp/parser.c:12979
0x945318 cp_parser_block_declaration
../../gcc/gcc/cp/parser.c:12874
0x945d49 cp_parser_declaration_statement
../../gcc/gcc/cp/parser.c:12468
0x9241c3 cp_parser_statement
../../gcc/gcc/cp/parser.c:10917
0x925130 cp_parser_statement_seq_opt
../../gcc/gcc/cp/parser.c:11266
0x925207 cp_parser_compound_statement
../../gcc/gcc/cp/parser.c:11220
0x93bde0 cp_parser_function_body
../../gcc/gcc/cp/parser.c:21781
0x93bde0 cp_parser_ctor_initializer_opt_and_function_body
../../gcc/gcc/cp/parser.c:21818
0x93c690 cp_parser_function_definition_after_declarator
../../gcc/gcc/cp/parser.c:26839
0x93d416 cp_parser_function_definition_from_specifiers_and_declarator
../../gcc/gcc/cp/parser.c:26755
0x93d416 cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:19501
0x94362a cp_parser_single_declaration
../../gcc/gcc/cp/parser.c:27295
0x94376c cp_parser_template_declaration_after_parameters
../../gcc/gcc/cp/parser.c:26897
0x94402c cp_parser_explicit_template_declaration
../../gcc/gcc/cp/parser.c:27134
0x94402c cp_parser_template_declaration_after_export
../../gcc/gcc/cp/parser.c:27153
Please submit a full bug report, [etc.]
