https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126209
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Jason Merrill <[email protected]>: https://gcc.gnu.org/g:da9cb50722ba0341bab9d0bf29d1cfa12be18f42 commit r17-2831-gda9cb50722ba0341bab9d0bf29d1cfa12be18f42 Author: Jason Merrill <[email protected]> Date: Wed Jul 29 14:04:24 2026 -0400 c++: anonymous namespace in module partition [PR126209] Here since r16-4484 we include all namespaces in the current purview in a module, even if the namespace comes from another partition. That breaks for an anonymous namespace, which is local to the TU (and added to the definition of TU-local entity by P2996 Reflection); here _c ended up representing the anonymous namespace from _a separately from the same one passed along from _b, leading to an ICE trying to import them into the same slot in _d. I tried just adding namespaces to is_tu_local_entity, but that broke other things, so for 16.2 let's handle them here. PR c++/126209 gcc/cp/ChangeLog: * module.cc (depset::hash::add_namespace_entities): Don't force out anonymous namespaces. gcc/testsuite/ChangeLog: * g++.dg/modules/anon-5_a.C: New test. * g++.dg/modules/anon-5_b.C: New test. * g++.dg/modules/anon-5_c.C: New test. * g++.dg/modules/anon-5_d.C: New test.
