http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59082
Bug ID: 59082
Summary: [4.7/4.8/4.9 Regression] ICE with duplicate (virtual)
base
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: reichelt at gcc dot gnu.org
The following invalid code snippet triggers an ICE since GCC 4.2.0:
================================
struct A {};
struct B : virtual A, A {};
A foo(const B &b)
{
return b;
}
================================
bug.cc:3:23: error: duplicate base type 'A' invalid
struct B : virtual A, A {};
^
bug.cc: In function 'A foo(const B&)':
bug.cc:7:10: internal compiler error: Segmentation fault
return b;
^
0xb2a93f crash_signal
../../gcc/gcc/toplev.c:334
0x618b2d contains_struct_check
../../gcc/gcc/tree.h:2819
0x618b2d build_vfield_ref(tree_node*, tree_node*)
../../gcc/gcc/cp/class.c:639
0x61816b build_base_path(tree_code, tree_node*, tree_node*, int, int)
../../gcc/gcc/cp/class.c:429
0x553a0c convert_like_real
../../gcc/gcc/cp/call.c:6108
0x552e1e convert_like_real
../../gcc/gcc/cp/call.c:6086
0x55491c build_over_call
../../gcc/gcc/cp/call.c:6944
0x550f3e build_new_method_call_1
../../gcc/gcc/cp/call.c:7814
0x550f3e build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
../../gcc/gcc/cp/call.c:7884
0x551e87 build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
../../gcc/gcc/cp/call.c:7441
0x553223 build_temp
../../gcc/gcc/cp/call.c:5784
0x553223 convert_like_real
../../gcc/gcc/cp/call.c:6128
0x5576d9 perform_implicit_conversion_flags(tree_node*, tree_node*, int, int)
../../gcc/gcc/cp/call.c:9019
0x6853c3 check_return_expr(tree_node*, bool*)
../../gcc/gcc/cp/typeck.c:8538
0x6c4bde finish_return_stmt(tree_node*)
../../gcc/gcc/cp/semantics.c:798
0x64d726 cp_parser_jump_statement
../../gcc/gcc/cp/parser.c:10590
0x64d726 cp_parser_statement
../../gcc/gcc/cp/parser.c:9284
0x64dcb9 cp_parser_statement_seq_opt
../../gcc/gcc/cp/parser.c:9654
0x64de2e cp_parser_compound_statement
../../gcc/gcc/cp/parser.c:9608
0x6614cb cp_parser_function_body
../../gcc/gcc/cp/parser.c:18461
Please submit a full bug report, [etc.]
