What does GCC's __attribute__(bitwise) mean? The attribute isn't mentioned in the info pages of GCC-4.6. I stubled upon it in the file open-iscsi-2.0.871/include/iscsi_proto.h in source the project Open-ISCSI where it is used as
.../* * If running svn modules we may need to define these. * This should not go upstream since this is already properly defined there */#ifdef __CHECKER__#define __bitwise__ __attribute__((bitwise))#else#define __bitwise__#endif#ifdef __CHECK_ENDIAN__#define __bitwise __bitwise__#else#define __bitwise#endif/*! initiator tags; opaque for target */typedef uint32_t __bitwise__ itt_t;/*! below makes sense only for initiator that created this tag */#define build_itt(itt, age) ((__force itt_t)\ ((itt) | ((age) << ISCSI_AGE_SHIFT)))#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)#define RESERVED_ITT ((__force itt_t)0xffffffff)...I'm suspecting something involving byte-order but I can't make any sense of the snippet given above.