Deprecate some C++ extensions

https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00995.html
	* doc/extend.texi (Deprecated Features): Update deprecared flags,
	mention anon-struct/union members and trailing attributes.

	cp/
	* class.c (finish_struct_anon_r): Refactor, deprecate anything
	other than public non-static data members.
	* parser.c (cp_parser_init_declarator): Deprecate attributes after
	parenthesized initializer.

	testsuite/
	* g++.dg/ext/anon-struct6.C: Adjust.
	* g++.dg/ext/deprecate-1.C: New.
	* g++.dg/ext/deprecate-2.C: New.
	* g++.dg/lookup/pr84602.C: Adjust.
	* g++.dg/lookup/pr84962.C: Adjust.
	* g++.old-deja/g++.other/anon4.C

From-SVN: r258712

1 files changed, 19 insertions, 37 deletions

diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index 8348552..3edae0f 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -2869,9 +2869,7 @@ warn_hidden (tree t)
 static void
 finish_struct_anon_r (tree field, bool complain)
 {
-  bool is_union = TREE_CODE (TREE_TYPE (field)) == UNION_TYPE;
-  tree elt = TYPE_FIELDS (TREE_TYPE (field));
-  for (; elt; elt = DECL_CHAIN (elt))
+  for (tree elt = TYPE_FIELDS (TREE_TYPE (field)); elt; elt = DECL_CHAIN (elt))
     {
       /* We're generally only interested in entities the user
 	 declared, but we also find nested classes by noticing
@@ -2885,50 +2883,34 @@ finish_struct_anon_r (tree field, bool complain)
 	      || TYPE_UNNAMED_P (TREE_TYPE (elt))))
 	continue;
 
-      if (TREE_CODE (elt) != FIELD_DECL)
+      if (complain
+	  && (TREE_CODE (elt) != FIELD_DECL
+	      || (TREE_PRIVATE (elt) || TREE_PROTECTED (elt))))
 	{
 	  /* We already complained about static data members in
 	     finish_static_data_member_decl.  */
-	  if (complain && !VAR_P (elt))
+	  if (!VAR_P (elt)
+	      && permerror (DECL_SOURCE_LOCATION (elt),
+			    TREE_CODE (TREE_TYPE (field)) == UNION_TYPE
+			    ? "%q#D invalid; an anonymous union may "
+			    "only have public non-static data members"
+			    : "%q#D invalid; an anonymous struct may "
+			    "only have public non-static data members", elt))
 	    {
-	      if (is_union)
-		permerror (DECL_SOURCE_LOCATION (elt),
-			   "%q#D invalid; an anonymous union can "
-			   "only have non-static data members", elt);
-	      else
-		permerror (DECL_SOURCE_LOCATION (elt),
-			   "%q#D invalid; an anonymous struct can "
-			   "only have non-static data members", elt);
-	    }
-	  continue;
-	}
-
-      if (complain)
-	{
-	  if (TREE_PRIVATE (elt))
-	    {
-	      if (is_union)
-		permerror (DECL_SOURCE_LOCATION (elt),
-			   "private member %q#D in anonymous union", elt);
-	      else
-		permerror (DECL_SOURCE_LOCATION (elt),
-			   "private member %q#D in anonymous struct", elt);
-	    }
-	  else if (TREE_PROTECTED (elt))
-	    {
-	      if (is_union)
-		permerror (DECL_SOURCE_LOCATION (elt),
-			   "protected member %q#D in anonymous union", elt);
-	      else
-		permerror (DECL_SOURCE_LOCATION (elt),
-			   "protected member %q#D in anonymous struct", elt);
+	      static bool hint;
+	      if (flag_permissive && !hint)
+		{
+		  hint = true;
+		  inform (DECL_SOURCE_LOCATION (elt),
+			  "this flexibility is deprecated and will be removed");
+		}
 	    }
 	}
 
       TREE_PRIVATE (elt) = TREE_PRIVATE (field);
       TREE_PROTECTED (elt) = TREE_PROTECTED (field);
 
-      /* Recurse into the anonymous aggregates to handle correctly
+      /* Recurse into the anonymous aggregates to correctly handle
 	 access control (c++/24926):
 
 	 class A {