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What does GCC's __attribute__(bitwise) mean? The attribute isn't mentioned in the info pages of GCC-4.6. I stumbled 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.

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