Eus <eus@xxxxxxxxxxxxxx> writes: > When browsing the Linux kernel 2.6.21.5's source code, I noticed a variable > definition like: > > typedef __u64 __bitwise __be64; > > Being curious about __bitwise, I found it out to be: > > #define __bitwise __bitwise__ > > that finally turned out to be: > > #define __bitwise__ __attribute__((bitwise)) > > Since it was __attribute__, I tried to find its documentation in GCC texinfo > file. But, I couldn't find one. Even I have tried to find it out in the Internet. > But, I still couldn't find one. There is no "bitwise" attribute in standard gcc. Looking at the Linux 2.6.24 sources, I see that it is defined as an attribute only when __CHECKER__ is defined. This has something to do with sparse--see Documentation/sparse.txt. I don't know the details. Ian
