--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern char end []; /* Any old symbol we're sure will be defined. */
+/* { dg-warning "cannot track unknown size extern" "cannot track unknown size extern" { target *-*-* } 0 } */
+
+int main ()
+{
+/* dummy register */
+__mf_register ((void *) end, 1, __MF_TYPE_GUESS, "end");
+char z = end[0];
+return z & 0;
+}