20010605-2.c

linux下编程用 编译软件

/* Origin: Joseph Myers <[e-mail]>.  */
/* As an extension, GCC allows a struct or union to be cast to its own
   type, but failed to allow this when a typedef was involved.
   Reported as PR c/2735 by <[e-mail]>.  */
union u { int i; };
typedef union u uu;
union u a;
uu b;

void
foo (void)
{
  a = (union u) b;
  a = (uu) b;
  b = (union u) a;
  b = (uu) a;
}