sizeof(((_struct * )NULL)->_field)
#if defined(__SIZEOF_LONG__)
-#define SIDE_BITS_PER_LONG (__SIZEOF_LONG__ * 8)
+# define SIDE_BITS_PER_LONG (__SIZEOF_LONG__ * 8)
#elif defined(_LP64)
-#define SIDE_BITS_PER_LONG 64
+# define SIDE_BITS_PER_LONG 64
#else
-#define SIDE_BITS_PER_LONG 32
+# define SIDE_BITS_PER_LONG 32
#endif
#define SIDE_PACKED __attribute__((packed))