missing part of Sept 22 change brought over:

	* decl.c (cp_finish_decl): Mark decls used if type has TREE_USED
	set,don't clear TREE_USED wholesale.

From-SVN: r16953

gcc/cp/ChangeLog

@@ -788,6 +788,12 @@ Thu Sep 25 11:11:13 1997  Jason Merrill  <jason@yorick.cygnus.com>
 	* decl.c (start_function): Up warning of no return type to be a
 	pedwarn.
 
+Mon Sep 22 14:15:34 1997  Benjamin Kosnik  <bkoz@rhino.cygnus.com>
+
+	* init.c (expand_member_init): Don't set TREE_USED.
+	* decl.c (cp_finish_decl): Mark decls used if type has TREE_USED
+	set,don't clear TREE_USED wholesale.
+
 Sat Sep 20 15:31:00 1997  Jason Merrill  <jason@yorick.cygnus.com>
 
 	* call.c (build_over_call): Do require_complete_type before

gcc/cp/decl.c

@@ -6956,6 +6956,10 @@ cp_finish_decl (decl, init, asmspec_tree, need_pop, flags)
 		 was initialized was ever used.  Don't do this if it has a
 		 destructor, so we don't complain about the 'resource
 		 allocation is initialization' idiom.  */
+	      /* Now set attribute((unused)) on types so decls of
+		 of that type will be marked used. (see TREE_USED, above.) 
+		 This avoids the warning problems this particular code
+		 tried to work around. */
 
 	      if (TYPE_NEEDS_CONSTRUCTING (type)
 		  && ! already_used
@@ -7797,6 +7801,9 @@ grokdeclarator (declarator, declspecs, decl_context, initialized, attrlist)
 		init = TREE_OPERAND (decl, 1);
 
 		decl = start_decl (declarator, declspecs, 1);
+		/* Look for __unused__ attribute */
+		if (TREE_USED (TREE_TYPE (decl)))
+		  TREE_USED (decl) = 1;
 		finish_decl (decl, init, NULL_TREE);
 		return 0;
 	      }