re PR c++/93138 (elaborated type specifier visibility check problem)

	PR c++/93138
	* parser.c (cp_parser_check_class_key): Disable access checks for the
	simple name lookup.
	(cp_parser_maybe_warn_enum_key): Likewise.  Return early if
	!warn_redundant_tags.

	* g++.dg/warn/Wredundant-tags-2.C: New test.

From-SVN: r279886

gcc/cp/ChangeLog

+2020-01-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/93138
+	* parser.c (cp_parser_check_class_key): Disable access checks for the
+	simple name lookup.
+	(cp_parser_maybe_warn_enum_key): Likewise.  Return early if
+	!warn_redundant_tags.
+
 2010-01-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/93046

gcc/cp/parser.c

@@ -30663,11 +30663,15 @@ static void
 cp_parser_maybe_warn_enum_key (cp_parser *parser, location_t key_loc,
 			       tree type, rid scoped_key)
 {
+  if (!warn_redundant_tags)
+    return;
+
   tree type_decl = TYPE_MAIN_DECL (type);
   tree name = DECL_NAME (type_decl);
-  /* Look up the NAME to see if it unambiguously refers to the TYPE
-     and set KEY_REDUNDANT if so.  */
+  /* Look up the NAME to see if it unambiguously refers to the TYPE.  */
+  push_deferring_access_checks (dk_no_check);
   tree decl = cp_parser_lookup_name_simple (parser, name, input_location);
+  pop_deferring_access_checks ();
 
   /* The enum-key is redundant for uses of the TYPE that are not
      declarations and for which name lookup returns just the type
@@ -30837,7 +30841,9 @@ cp_parser_check_class_key (cp_parser *parser, location_t key_loc,
   tree name = DECL_NAME (type_decl);
   /* Look up the NAME to see if it unambiguously refers to the TYPE
      and set KEY_REDUNDANT if so.  */
+  push_deferring_access_checks (dk_no_check);
   tree decl = cp_parser_lookup_name_simple (parser, name, input_location);
+  pop_deferring_access_checks ();
 
   /* The class-key is redundant for uses of the CLASS_TYPE that are
      neither definitions of it nor declarations, and for which name

gcc/testsuite/ChangeLog

-2010-01-05  Jakub Jelinek  <jakub@redhat.com>
+2020-01-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/93138
+	* g++.dg/warn/Wredundant-tags-2.C: New test.
 
 	PR c++/93046
 	* g++.dg/ext/cond4.C: New test.

gcc/testsuite/g++.dg/warn/Wredundant-tags-2.C

+// PR c++/93138
+// { dg-do compile }
+// { dg-options "-Wredundant-tags" }
+
+struct Foo
+{
+  enum Kind { a };
+private:
+  Kind Kind;
+};
+enum Foo::Kind foo ();		// { dg-bogus "is private within this context|redundant" }
+struct Bar
+{
+  struct Kind { int a; };
+private:
+  Kind Kind;
+};
+struct Bar::Kind bar ();	// { dg-bogus "is private within this context|redundant" }