http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60218
Bug ID: 60218 Summary: [c++11] ICE using __bases for broken class hierarchy Product: gcc Version: 4.9.0 Status: UNCONFIRMED Keywords: error-recovery, ice-on-invalid-code 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 (compiled with "-std=c++11") triggers an ICE since GCC 4.7.0 (when __bases was introduced): ================================== template<typename...> struct A {}; template<typename T> struct B { typedef A<__bases(T)...> C; }; struct X {}; struct Y : X* {}; B<Y> b; ================================== bug.cc:9:13: error: expected '{' before '*' token struct Y : X* {}; ^ bug.cc:9:15: error: expected unqualified-id before '{' token struct Y : X* {}; ^ bug.cc:9:15: error: invalid type in declaration before '{' token bug.cc: In instantiation of 'struct B<Y>': bug.cc:11:6: required from here bug.cc:5:28: internal compiler error: Segmentation fault typedef A<__bases(T)...> C; ^ 0xba53bf crash_signal ../../gcc/gcc/toplev.c:337 0x7214a0 tree_check ../../gcc/gcc/tree.h:2708 0x7214a0 dfs_calculate_bases_pre ../../gcc/gcc/cp/semantics.c:3696 0x71c30e dfs_walk_all(tree_node*, tree_node* (*)(tree_node*, void*), tree_node* (*)(tree_node*, void*), void*) ../../gcc/gcc/cp/search.c:1583 0x721c08 calculate_bases_helper ../../gcc/gcc/cp/semantics.c:3718 0x73a427 calculate_bases(tree_node*) ../../gcc/gcc/cp/semantics.c:3748 0x618da3 tsubst_pack_expansion ../../gcc/gcc/cp/pt.c:9558 0x628eb2 tsubst_template_args ../../gcc/gcc/cp/pt.c:9792 0x628cf5 tsubst_template_args ../../gcc/gcc/cp/pt.c:9810 0x6296a3 tsubst_aggr_type ../../gcc/gcc/cp/pt.c:10025 0x61ba41 tsubst(tree_node*, tree_node*, int, tree_node*) ../../gcc/gcc/cp/pt.c:11436 0x62dbde tsubst_decl ../../gcc/gcc/cp/pt.c:10908 0x61beef tsubst(tree_node*, tree_node*, int, tree_node*) ../../gcc/gcc/cp/pt.c:11357 0x64a39a instantiate_class_template_1 ../../gcc/gcc/cp/pt.c:9010 0x64a39a instantiate_class_template(tree_node*) ../../gcc/gcc/cp/pt.c:9274 0x6db9c3 complete_type(tree_node*) ../../gcc/gcc/cp/typeck.c:134 0x5c4f88 start_decl_1(tree_node*, bool) ../../gcc/gcc/cp/decl.c:4719 0x5edeb7 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int, tree_node*, tree_node*, tree_node**) ../../gcc/gcc/cp/decl.c:4682 0x6c7eee cp_parser_init_declarator ../../gcc/gcc/cp/parser.c:16680 0x6c9979 cp_parser_simple_declaration ../../gcc/gcc/cp/parser.c:11205 Please submit a full bug report, [etc.]