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 void do_not_optimize_away ();
   8
   9 int main()
  10 {
  11   void * volatile p;
  12   errno = 0;
  13   p = malloc (-1);
  14   if (errno != 0)
  15     do_not_optimize_away ();
  16   return 0;
  17 }
  18
  19 /* { dg-final { scan-assembler "do_not_optimize_away" } } */