gcc/testsuite/gcc.dg/c99-flex-array-4.c

   1 /* Test for flexible array members.  Test for agreement of offset and
   2    structure size.  This is expected to fail, because of a possible
   3    defect in the standard.  */
   4 /* Origin: http://gcc.gnu.org/ml/gcc/2002-05/msg02844.html
   5    from Tony Finch <dot@dotat.at>, adapted to a testcase by Joseph Myers
   6    <jsm28@cam.ac.uk>.  See also WG14 reflector messages 9571-3.  */
   7 /* { dg-do compile } */
   8 /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
   9
  10 #include <stddef.h>
  11
  12 struct foo {
  13   int a;
  14   short b;
  15   char pad[];
  16 };
  17
  18 struct bar {
  19   int a;
  20   short b;
  21   char pad[1024];
  22 };
  23
  24 char x[(sizeof(struct foo) == offsetof(struct foo, pad)) ? 1 : -1]; /* { dg-bogus "negative" "sizeof != offsetof" { xfail *-*-* } } */
  25 char y[(offsetof(struct foo, pad) == offsetof(struct bar, pad)) ? 1 : -1];