gcc/testsuite/gcc.dg/errno-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 #include <errno.h>
   5 #include <stdlib.h>
   6
   7 int main()
   8 {
   9   void *p;
  10   errno = 0;
  11   p = malloc (-1);
  12   if (errno != 0)
  13     do_not_optimize_away ();
  14   return 0;
  15 }
  16
  17 /* { dg-final { scan-assembler "do_not_optimize_away" } } */