--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/ordered-comparison-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,21 @@
+/* Test warning for ordered comparison pointer with null pointer constant. */
+/* Test with -pedantic-errors. */
+/* { dg-do compile } */
+/* { dg-options "-pedantic-errors" } */
+extern void z();
+void *p;
+
+void f() {
+ if ( z >= 0 ) /* { dg-error "ordered comparison of pointer with" } */
+   z();
+ if ( 0 >= z) /* { dg-error "ordered comparison of pointer with" } */
+    z();
+ if ( p >= (void*)0 )
+    z();
+ if ( (void*)0 >= p)
+    z();
+ if (z >= (void*)0) /* { dg-error "distinct pointer types lacks a cast" } */
+    z();
+ if ((void*)0 >=z) /* { dg-error "distinct pointer types lacks a cast" } */
+    z(); 
+}