https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84707
Bug ID: 84707 Summary: internal compiler error: Segmentation fault (tree_check()/duplicate_decls()) Product: gcc Version: 8.0.1 Status: UNCONFIRMED Keywords: ice-on-invalid-code Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: vegard.nossum at gmail dot com CC: webrown.cpp at gmail dot com Target Milestone: --- Input (this one is positively cute): inline namespace { namespace {} } namespace {} Output: $ xgcc -x c++ -S - <stdin>:5:1: internal compiler error: Segmentation fault 0x3156909 crash_signal /home/vegard/git/gcc/gcc/toplev.c:325 0xb8cefc tree_check(tree_node*, char const*, int, char const*, tree_code) /home/vegard/git/gcc/gcc/tree.h:3131 0xb8cefc duplicate_decls(tree_node*, tree_node*, bool) /home/vegard/git/gcc/gcc/cp/decl.c:1413 0xe5f3e9 do_pushdecl /home/vegard/git/gcc/gcc/cp/name-lookup.c:3019 0xe6b16a pushdecl(tree_node*, bool) /home/vegard/git/gcc/gcc/cp/name-lookup.c:3154 0xe6b16a push_namespace(tree_node*, bool) /home/vegard/git/gcc/gcc/cp/name-lookup.c:6953 0xffd25f cp_parser_namespace_definition /home/vegard/git/gcc/gcc/cp/parser.c:18579 0x100203f cp_parser_declaration /home/vegard/git/gcc/gcc/cp/parser.c:12762 0xff9d9b cp_parser_declaration_seq_opt /home/vegard/git/gcc/gcc/cp/parser.c:12654 0xffb3c3 cp_parser_translation_unit /home/vegard/git/gcc/gcc/cp/parser.c:4561 0xffb3c3 c_parse_file() /home/vegard/git/gcc/gcc/cp/parser.c:38993 0x15a7105 c_common_parse_file() /home/vegard/git/gcc/gcc/c-family/c-opts.c:1132 $ xgcc --version xgcc (GCC) 8.0.1 20180303 (experimental) Built from git 0d86c284d085d29782d862600a79aa1ff0ee0c47 (r258221). Looks fine with 7.3.0. Test case was minimised by C-Reduce.