https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123186
--- Comment #8 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <[email protected]>: https://gcc.gnu.org/g:1c555ba67a34ced2460a065eac05ae2e2693ca4d commit r16-6248-g1c555ba67a34ced2460a065eac05ae2e2693ca4d Author: Jakub Jelinek <[email protected]> Date: Thu Dec 18 16:41:10 2025 +0100 c++: Fix up recent cp_parser_template_id regression [PR123186] On Fri, Dec 12, 2025 at 09:39:18AM -0500, Patrick Palka wrote: > + TREE_TYPE (templ) > + = build_typename_type (TYPE_CONTEXT (TREE_TYPE (templ)), > + TYPE_NAME (TREE_TYPE (templ)), > + fullname, > + get_typename_type_tag (TREE_TYPE (templ))); > template_id = templ; > } > else This change causes ICE e.g. on the following testcase. The problem is that build_typename_type expects IDENTIFIER_NODE as the second argument, e.g. it uses it as tree d = build_decl (input_location, TYPE_DECL, name, t); argument. But TYPE_NAME doesn't have to be an IDENTIFIER_NODE, it can be a TYPE_DECL too and when we build a TYPE_DECL with TYPE_DECL as DECL_NAME, it breaks all kinds of assumptions everywhere in the FE as well as middle-end. Fixed by using TYPE_IDENTIFIER instead. 2025-12-18 Jakub Jelinek <[email protected]> PR c++/123186 * parser.cc (cp_parser_template_id): Use TYPE_IDENTIFIER instead of TYPE_NAME in second build_typename_type argument. * g++.dg/template/crash133.C: New test.
