Hi, In flist.h (https://github.com/axboe/fio/blob/fio-2.17/flist.h#L6 ) there's the following: #undef offsetof #ifdef __compiler_offsetof #define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER) #else #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) #endif The problem is that __compiler_offsetof usually not defined (in the Linux kernel it gets set when you are using gcc 4+ - http://lxr.free-electrons.com/source/include/linux/compiler-gcc4.h?v=3.8#L14 . This leads to a hand rolled offsetof being used that can trigger undefined behaviour checks (https://en.wikipedia.org/wiki/Offsetof#Implementation ). While it's possible to produce a configure check that tests for __builtin_offsetof and adds -D__compiler_offsetof=__builtin_offsetof to the CFLAGS is there any particular reason why the offsetof from stdlib (which will avoid undefined behaviour if possible) is replaced? -- Sitsofe | http://sucs.org/~sits/ -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
