[Bug c++/65558] [5 Regression] crash using __attribute__((__abi_tag__)) on anonymous inline namespace

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65558

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
If it is correct to ignore the abi_tag on an anonymous namespace (docs say "The
ABI tags apply to a name..."), then:

--- a/gcc/cp/name-lookup.c
+++ b/gcc/cp/name-lookup.c
@@ -3663,6 +3663,12 @@ handle_namespace_attrs (tree ns, tree attributes)
                       "namespace", name);
              continue;
            }
+         if (!DECL_NAME (ns))
+           {
+             warning (OPT_Wattributes, "ignoring %qD attribute on anonymous "
+                      "namespace", name);
+             continue;
+           }
          if (!args)
            {
              tree dn = DECL_NAME (ns);