https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'm testing
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -534,6 +534,7 @@ check_global_declaration (tree decl)
to handle multiple external decls in different scopes. */
&& ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
&& ! DECL_EXTERNAL (decl)
+ && ! DECL_ARTIFICIAL (decl)
&& ! TREE_PUBLIC (decl)
/* A volatile variable might be used in some non-obvious way. */
&& ! TREE_THIS_VOLATILE (decl)
(Maybe we should also test !TREE_NO_WARNING but the above is enough to fix
this.)
