c-decl.c (duplicate_decls): If different_binding_level is nonzero...

	* c-decl.c (duplicate_decls): If different_binding_level is nonzero,
	olddecl has argument types and newdecl has none, use the argument
	types from olddecl.

From-SVN: r39254

gcc/ChangeLog

+Thu Jan 25 02:01:16 2001  J"orn Rennecke <amylaar@redhat.com>
+
+	* c-decl.c (duplicate_decls): If different_binding_level is nonzero,
+	olddecl has argument types and newdecl has none, use the argument
+	types from olddecl.
+
 2001-01-24  Ulrich Drepper  <drepper@redhat.com>
 
 	* dwarf2out.c (prefix_of): New function.  Determine longest common

gcc/c-decl.c

@@ -1800,11 +1800,17 @@ duplicate_decls (newdecl, olddecl, different_binding_level)
       if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
 	{
 	  if (different_binding_level)
-	    TREE_TYPE (newdecl)
-	      = build_type_attribute_variant
-		(newtype,
-		 merge_attributes (TYPE_ATTRIBUTES (newtype),
-				   TYPE_ATTRIBUTES (oldtype)));
+	    {
+	      if (TYPE_ARG_TYPES (oldtype) != 0
+		  && TYPE_ARG_TYPES (newtype) == 0)
+		TREE_TYPE (newdecl) = common_type (newtype, oldtype);
+	      else
+		TREE_TYPE (newdecl)
+		  = build_type_attribute_variant
+		    (newtype,
+		     merge_attributes (TYPE_ATTRIBUTES (newtype),
+				       TYPE_ATTRIBUTES (oldtype)));
+	    }
 	  else
 	    TREE_TYPE (newdecl)
 	      = TREE_TYPE (olddecl)