gcc/testsuite/c-c++-common/Wunused-value-1.c

   1 /* PR c/97748 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wunused-value" } */
   4
   5 double _Complex f ();
   6 double _Complex *p;
   7
   8 double _Complex
   9 foo (double _Complex x)
  10 {
  11   ++x;                  /* { dg-bogus "value computed is not used" } */
  12   --x;                  /* { dg-bogus "value computed is not used" } */
  13   x += 1;               /* { dg-bogus "value computed is not used" } */
  14   x += 1.0iF;           /* { dg-bogus "value computed is not used" } */
  15   x++;                  /* { dg-bogus "value computed is not used" } */
  16   x--;                  /* { dg-bogus "value computed is not used" } */
  17   x + 1;                /* { dg-warning "value computed is not used" } */
  18   (void) (x + 1);       /* { dg-bogus "value computed is not used" } */
  19   1 + f ();             /* { dg-warning "value computed is not used" } */
  20   f () + f ();          /* { dg-warning "value computed is not used" } */
  21   f () + f (), f ();    /* { dg-warning "value computed is not used" } */
  22   f ();
  23   (void) f ();
  24   *p++;                 /* { dg-warning "value computed is not used" } */
  25   ++*p;                 /* { dg-bogus "value computed is not used" } */
  26   (*p ? f () : 0);
  27   ({ f (); });
  28   ({ f () + 1; });
  29   ({ f (); 0; });
  30   ({ f () + 1; 0; });   /* { dg-warning "value computed is not used" } */
  31   1 + ({ f (); });      /* { dg-warning "value computed is not used" } */
  32   return x;
  33 }