gcc/testsuite/gcc.dg/c90-array-lval-4.c

   1 /* Test for non-lvalue arrays decaying to pointers: in C99 only.
   2    Test various ways of producing non-lvalue arrays.  */
   3 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=iso9899:1990 -pedantic-errors" } */
   6
   7 struct s { char c[17]; };
   8
   9 struct s x;
  10
  11 struct s a, b, c;
  12 int d;
  13
  14 #define ASSERT(v, a)    char v[((a) ? 1 : -1)]
  15
  16 ASSERT (p, sizeof (x.c) == 17);
  17 ASSERT (q, sizeof (0, x.c) == sizeof (char *));
  18 ASSERT (r0, sizeof ((d ? b : c).c) == 17);
  19 ASSERT (r1, sizeof ((d, b).c) == 17);
  20 ASSERT (r2, sizeof ((a = b).c) == 17);
  21 /* The non-lvalue array does not decay to a pointer, so the comma expression
  22    has (non-lvalue) array type.
  23 */
  24 ASSERT (s0, sizeof (0, (d ? b : c).c) == 17); /* { dg-bogus "array" "bad non-lvalue array handling" } */
  25 ASSERT (s0, sizeof (0, (d, b).c) == 17); /* { dg-bogus "array" "bad non-lvalue array handling" } */
  26 ASSERT (s0, sizeof (0, (a = b).c) == 17); /* { dg-bogus "array" "bad non-lvalue array handling" } */