https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103057
Bug ID: 103057 Summary: Internal compiler error: Error reporting routines re-entered Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: plasmahh at gmx dot net Target Milestone: --- Created attachment 51728 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51728&action=edit cvise generated testcase Compiling the attached testcase (generated with cvise out of a "real world" piece of code, where supressing an "unused parameter" warning makes this go away, due to the testcase being an error now, the error will trigger it too I guess) with -std=gnu++2b (and likely some others) will ICE out: Internal compiler error: Error reporting routines re-entered. 0xbd474d cxx_incomplete_type_diagnostic(unsigned int, tree_node const*, tree_node const*, diagnostic_t) ../../gcc/cp/typeck2.c:330 0xb6629c cxx_incomplete_type_diagnostic(tree_node const*, tree_node const*, diagnostic_t) ../../gcc/cp/cp-tree.h:8016 0xb6629c cxx_incomplete_type_error(tree_node const*, tree_node const*) ../../gcc/cp/cp-tree.h:8025 0xb6629c instantiate_class_template_1 ../../gcc/cp/pt.c:12106 0xb66cd2 instantiate_class_template(tree_node*) ../../gcc/cp/pt.c:12302 0xbb58d9 complete_type(tree_node*) ../../gcc/cp/typeck.c:143 0xbb5a94 complete_type(tree_node*) ../../gcc/cp/typeck.c:169 0xbb5a94 complete_type_or_maybe_complain(tree_node*, tree_node*, int) ../../gcc/cp/typeck.c:156 0xb4ddb2 tsubst(tree_node*, tree_node*, int, tree_node*) ../../gcc/cp/pt.c:16069 0xb4ef9b tsubst_template_args(tree_node*, tree_node*, int, tree_node*) ../../gcc/cp/pt.c:13411 0xb4caa2 tsubst(tree_node*, tree_node*, int, tree_node*) ../../gcc/cp/pt.c:15449 0xa3266c dump_template_bindings ../../gcc/cp/error.c:482 0xa2bbba dump_function_decl ../../gcc/cp/error.c:1796 0xa33e0d decl_to_string ../../gcc/cp/error.c:3216 0xa33e0d cp_printer ../../gcc/cp/error.c:4387 0x1f9317c pp_format(pretty_printer*, text_info*) ../../gcc/pretty-print.c:1475 0x1f76b92 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*) ../../gcc/diagnostic.c:1342 0x1f770f6 diagnostic_impl ../../gcc/diagnostic.c:1504 0x1f7787f permerror(unsigned int, char const*, ...) ../../gcc/diagnostic.c:1771 0xa26072 c_parse_final_cleanups() ../../gcc/cp/decl2.c:5255