https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106604
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:f50f603cbfd05653555e9856360c83108bbd1d8a commit r14-3175-gf50f603cbfd05653555e9856360c83108bbd1d8a Author: Patrick Palka <ppa...@redhat.com> Date: Fri Aug 11 21:13:23 2023 -0400 c++: bogus warning w/ deduction guide in anon ns [PR106604] Here we're unintentionally issuing a "declared static but never defined" warning from wrapup_namespace_globals for a deduction guide declared in an anonymous namespace. This patch fixes this by giving deduction guides a dummy DECL_INITIAL, which suppresses the warning and also allows us to simplify redeclaration checking for them. Co-authored-by: Jason Merrill <ja...@redhat.com> PR c++/106604 gcc/cp/ChangeLog: * decl.cc (redeclaration_error_message): Remove special handling for deduction guides. (grokfndecl): Give deduction guides a dummy DECL_INITIAL. gcc/testsuite/ChangeLog: * g++.dg/cpp1z/class-deduction74.C: Expect "defined" instead of "declared" in the repeated deduction guide diagnostics. * g++.dg/cpp1z/class-deduction116.C: New test.