https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101015
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is because dump_decl does the decoration for TYPE_DECL_ALIAS_P:
1228 if (TYPE_DECL_ALIAS_P (t)
1229 && (flags & TFF_DECL_SPECIFIERS
1230 || flags & TFF_CLASS_KEY_OR_ENUM))
1231 {
1232 pp_cxx_ws_string (pp, "using");
1233 dump_decl (pp, DECL_NAME (t), flags);
1234 pp_cxx_whitespace (pp);
1235 pp_cxx_ws_string (pp, "=");
1236 pp_cxx_whitespace (pp);
1237 dump_type (pp, (DECL_ORIGINAL_TYPE (t)
1238 ? DECL_ORIGINAL_TYPE (t) : TREE_TYPE (t)),
1239 flags);
A way around it would be to disable TYPE_DECL_ALIAS_P temporarily for the
warning:
--- a/gcc/cp/decl2.c
+++ b/gcc/cp/decl2.c
@@ -5519,7 +5519,16 @@ cp_warn_deprecated_use (tree decl, tsubst_flags_t
complain)
}
}
else
- warned = warn_deprecated_use (decl, NULL_TREE);
+ {
+ // XXX alias_type_or_template_p?
+ const bool using_p = (TREE_CODE (decl) == TYPE_DECL
+ && TYPE_DECL_ALIAS_P (decl));
+ if (using_p)
+ TYPE_DECL_ALIAS_P (decl) = false;
+ warned = warn_deprecated_use (decl, NULL_TREE);
+ if (using_p)
+ TYPE_DECL_ALIAS_P (decl) = true;
+ }
return warned;
}
and then we get:
101015.C:7:8: warning: ‘A::bad’ is deprecated [-Wdeprecated-declarations]
7 | A::bad j = 0;
| ^
101015.C:3:9: note: declared here
3 | using bad [[deprecated]] = int;
| ^~~
But maybe that's too ugly a hack.
