gcc/testsuite/gcc.dg/nonnull-5.c

   1 /* Reduced from https://sourceware.org/bugzilla/show_bug.cgi?id=20978 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -Wnonnull" } */
   4
   5 int
   6 foo (const char *name)
   7 {
   8   if (name)
   9     return 6;
  10   return __builtin_strlen (name);       /* { dg-warning "argument 1 null where non-null expected" } */
  11 }