Sam Steingold <sds@xxxxxxx> writes: >> Yes, that's correct. You'd need to write a variant to do what you want. > > <screaming in pain> It's not that bad, if you can assume Autoconf 2.59. Just copy the existing code from the sizeof-using macro, and repair it to allow objects rather than types. > the reason I want a CPP macro and not a run-time if is that the code > will end up looking like this: > > if (size_of(u.ut_tv.tv_sec) = 4) > a_function_expecting_32_bit_argument(u.ut_tv.tv_sec); > else > a_function_expecting_64_bit_argument(u.ut_tv.tv_sec); > > the result is that on _each_ platform there will be a compile-time > warning about a wrong argument type. My suggestion is to fix the compiler, or get a better compiler, or ignore the warnings. Your life is too short to waste it worrying about incorrect compiler warnings. Also, unless there is a serious efficiency issue (not likely here) or some other issue I don't quite follow, I'd write the code like this: a_function_expecting_64_bit_argument (u.ut_tv.tv_sec); This will work fine on C89 and better, if you've prototyped the function. _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
