This adds a set of calls to name lookup that are needed by modules. Generally installing imported bindings, or walking the current TU's bindings. One note about template instantiations though. When we're about to instantiate a template we have to know about all the maybe-partial specializations that exist. These can be in any imported module -- not necesarily the module defining the template. Thus we key such foreign templates to the innermost namespace and identifier of the containing entitity -- that's the only thing we have a handle on. That's why we note and load pending specializations here. gcc/cp/ * module.cc (lazy_specializations_p): Stub. * name-lookup.h (append_imported_binding_slot) (mergeable_namespacE_slots, lookup_class_binding) (walk_module_binding, import_module_binding, set_module_binding) (note_pending_specializations, load_pending_specializations) (add_module_decl, add_imported_namespace): Declare. (get_cxx_dialect_name): Declare. (enum WMB_flags): New. * name-lookup.c (append_imported_binding_slot) (mergeable_namespacE_slots, lookup_class_binding) (walk_module_binding, import_module_binding, set_module_binding) (note_pending_specializations, load_pending_specializations) (add_module_decl, add_imported_namespace): New. (get_cxx_dialect_name): Make extern.