* tree.c (initializer_zerop): Handle STRING_CST.

From-SVN: r159103

gcc/ChangeLog

+2010-05-06  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
+	* tree.c (initializer_zerop): Handle STRING_CST.
+
 2010-05-06  Manuel López-Ibáñez  <manu@gcc.gnu.org>
 
 	PR 40989

gcc/tree.c

@@ -9414,6 +9414,19 @@ initializer_zerop (const_tree init)
 	return true;
       }
 
+    case STRING_CST:
+      {
+	int i;
+
+	/* We need to loop through all elements to handle cases like
+	   "\0" and "\0foobar".  */
+	for (i = 0; i < TREE_STRING_LENGTH (init); ++i)
+	  if (TREE_STRING_POINTER (init)[i] != '\0')
+	    return false;
+
+	return true;
+      }
+
     default:
       return false;
     }