> If it's not a problem, then the invoker doesn't need to check the exit
> code of setup.py.  Why are you resistant to exposing more information?

Because I believe that the information that is being exposed in this
patch is confusing, and will trick people into believing things that
actually don't happen. When they then try to track down the problems,
they will (then rightly) complain that the implemented behavior is
incorrect.