re PR fortran/21257 ([4.0 only] Duplicate use of construct name)

	PR fortran/21257
	(Ported from g95)
	* match.c (gfc_match_label): Detect duplicate labels.

From-SVN: r101214

gcc/fortran/ChangeLog

-2005-06-20 Erik Edelmann <erik.edelmann@iki.fi>
+2005-06-20  Steven G. Kargl  <kargls@comcast.net.
+	(port from g95)
+
+	PR fortran/21257
+	* match.c (gfc_match_label): Detect duplicate labels.
+
+
+2005-06-20  Erik Edelmann  <erik.edelmann@iki.fi>
 
 	* intrinsic.c (check_intrinsic_standard): Fix spelling error
 	in a warning message.

gcc/fortran/match.c

@@ -250,7 +250,6 @@ match
 gfc_match_label (void)
 {
   char name[GFC_MAX_SYMBOL_LEN + 1];
-  gfc_state_data *p;
   match m;
 
   gfc_new_block = NULL;
@@ -265,18 +264,15 @@ gfc_match_label (void)
       return MATCH_ERROR;
     }
 
-  if (gfc_new_block->attr.flavor != FL_LABEL
-      && gfc_add_flavor (&gfc_new_block->attr, FL_LABEL,
-			 gfc_new_block->name, NULL) == FAILURE)
-    return MATCH_ERROR;
+  if (gfc_new_block->attr.flavor == FL_LABEL)
+    {
+      gfc_error ("Duplicate construct label '%s' at %C", name);
+      return MATCH_ERROR;
+    }
 
-  for (p = gfc_state_stack; p; p = p->previous)
-    if (p->sym == gfc_new_block)
-      {
-	gfc_error ("Label %s at %C already in use by a parent block",
-		   gfc_new_block->name);
-	return MATCH_ERROR;
-      }
+  if (gfc_add_flavor (&gfc_new_block->attr, FL_LABEL,
+		      gfc_new_block->name, NULL) == FAILURE)
+    return MATCH_ERROR;
 
   return MATCH_YES;
 }