If you're doing systems level programming, you shouldn't be counting on anything being portable anyway. Reimplementing it is worthless for projects are on a si

If you're doing systems level programming, you shouldn't be counting on anything being portable anyway. Reimplementing it is worthless for projects are on a single OS. If you're implementing the OS, then these decisions need to be made anyway, independent of the language. You should be coding to(or with) the OS you're working on. If you're doing multiplatform stuff, then #defines with a naming scheme work, and are already the standard practice.