True, but there are a few gotchas with that version. It won't work with execve, it doesn't cache the binary, it won't work if called with "source", it doesn't set argv[0] properly when the binary is called, and a few other things. It is nice and terse though.
execve compatibility is not easy at all, since it requires a shebang line which isn't valid C. However thanks to emmelaich's // idea I just figured out a way to do it using fewer lines than your #if 0 solution.
