https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79435
Bug ID: 79435 Summary: ICE on invalid C++ code (with member access into an incomplete type) on x86_64-linux-gnu: Segmentation fault Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: su at cs dot ucdavis.edu Target Milestone: --- It should be a recent regression. $ g++-trunk -v Using built-in specs. COLLECT_GCC=g++-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto --prefix=/usr/local/gcc-trunk --disable-bootstrap Thread model: posix gcc version 7.0.1 20170208 (experimental) [trunk revision 245266] (GCC) $ $ g++-trunk -c -w small.cpp small.cpp:3:28: internal compiler error: Segmentation fault template < int > int f = a.x; ^ 0xe1439f crash_signal ../../gcc-source-trunk/gcc/toplev.c:333 0x6e2a88 type_dependent_expression_p(tree_node*) ../../gcc-source-trunk/gcc/cp/pt.c:23832 0x8dca90 potential_constant_expression_1 ../../gcc-source-trunk/gcc/cp/constexpr.c:5159 0x7bcd94 cp_parser_constant_expression ../../gcc-source-trunk/gcc/cp/parser.c:9468 0x7bd4f4 cp_parser_initializer_clause ../../gcc-source-trunk/gcc/cp/parser.c:21595 0x7bee8b cp_parser_initializer ../../gcc-source-trunk/gcc/cp/parser.c:21533 0x7ce618 cp_parser_init_declarator ../../gcc-source-trunk/gcc/cp/parser.c:19352 0x7d59c1 cp_parser_single_declaration ../../gcc-source-trunk/gcc/cp/parser.c:26720 0x7d5afc cp_parser_template_declaration_after_parameters ../../gcc-source-trunk/gcc/cp/parser.c:26321 0x7d6521 cp_parser_explicit_template_declaration ../../gcc-source-trunk/gcc/cp/parser.c:26553 0x7d6521 cp_parser_template_declaration_after_export ../../gcc-source-trunk/gcc/cp/parser.c:26571 0x7d6ad9 cp_parser_declaration ../../gcc-source-trunk/gcc/cp/parser.c:12464 0x7d6de4 cp_parser_declaration_seq_opt ../../gcc-source-trunk/gcc/cp/parser.c:12391 0x7d7128 cp_parser_translation_unit ../../gcc-source-trunk/gcc/cp/parser.c:4366 0x7d7128 c_parse_file() ../../gcc-source-trunk/gcc/cp/parser.c:38406 0x93f2e2 c_common_parse_file() ../../gcc-source-trunk/gcc/c-family/c-opts.c:1107 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. $ ------------------------------------ struct A; extern A a; template < int > int f = a.x;