gcc/testsuite/gcc.dg/pr46921.c

   1 /* PR c/46921  lost side effect when struct initializer expr uses comma
   2       operator  */
   3
   4 /* { dg-do run } */
   5 /* { dg-options "" } */
   6
   7 extern int printf(const char *, ...);
   8 extern void abort (void);
   9
  10 typedef struct __uws_0 { } uw_unit;
  11 uw_unit uw_unit_v = {};
  12
  13 struct __uws_1
  14 {
  15   struct __uws_0 __uwf_1;
  16   struct __uws_1* __uwf_2;
  17 };
  18
  19 static int left_hand_eval = 0;
  20
  21 static void
  22 foo (const char *s)
  23 {
  24   ++left_hand_eval;
  25   printf("%s", s);
  26 }
  27
  28 int
  29 main ()
  30 {
  31   struct __uws_1 tmp = {(foo("Inner\n"), uw_unit_v)};
  32
  33   printf("Outer\n");
  34   /* left hand expression in comma operator initializer must always be
  35      evaluated if there are side effects.  */
  36   if (!left_hand_eval)
  37     abort ();
  38
  39   return 0;
  40 }