gcc/testsuite/gcc.dg/fixed-point/struct-layout-1.c

   1 /* { dg-do run } */
   2 /* { dg-options "-std=gnu99" } */
   3
   4 /* This test is based on the test from ../dfp/.  */
   5
   6 #include <stdarg.h>
   7
   8 extern void abort (void);
   9
  10 struct S1
  11 {
  12   long _Fract a[0];
  13 };
  14
  15 struct S2
  16 {
  17   struct
  18   {
  19     long _Fract e;
  20   } b[0];
  21 };
  22
  23 struct S3
  24 {
  25   union
  26   {
  27     long _Fract c;
  28   } a[0];
  29 };
  30
  31 struct S4
  32 {
  33   int a[0];
  34   long _Fract b[0];
  35 };
  36
  37 struct S5
  38 {
  39   union
  40   {
  41     long _Fract c[0];
  42   } a;
  43 };
  44
  45 int check_var (int z, ...)
  46 {
  47   long long result;
  48   va_list ap;
  49   va_start (ap, z);
  50   va_arg (ap, struct S1);
  51   result = va_arg (ap, long long);
  52   va_end (ap);
  53
  54   return (result == 2LL);
  55 }
  56
  57 int main ()
  58 {
  59   struct S1 s1;
  60   struct S2 s2;
  61   struct S3 s3;
  62   struct S4 s4;
  63   struct S5 s5;
  64
  65   if (check_var (2, s1, 2LL) == 0)
  66     abort ();
  67   if (check_var (2, s2, 2LL) == 0)
  68     abort ();
  69   if (check_var (2, s3, 2LL) == 0)
  70     abort ();
  71   if (check_var (2, s4, 2LL) == 0)
  72     abort ();
  73   if (check_var (2, s5, 2LL) == 0)
  74     abort ();
  75
  76   return 0;
  77 }