When I compile an application which includes <bits/string2.h> with
"-pedantic", I see this warning:

/usr/include/bits/string2.h:611: warning: pointer targets in return differ
in signedness

This patch to string2.h fixes the problem:

--- /usr/include/bits/string2.h~	Mon Sep 20 05:12:49 1999
+++ /usr/include/bits/string2.h	Mon Nov 22 19:28:52 1999
@@ -608,7 +608,7 @@
       __u = __extension__ ((void *) __u + 3);
       break;
     }
-  return &__u->__uc;
+  return (char *) &__u->__uc;
 }
 #  else
 #  define __stpcpy_args(src) \