How do I find out what files an RPM command is going to write?

[Toralf Lund <toralf kscanners com>]

This question is somewhat related to one I asked earlier, but as I
didn't get an answer that was quite satisfactory, so I'll try again:

Given an RPM .spec file and a command line used to build RPMS from it,
is there a _simple_ way to determine in advance what files are going to
be written? I've tried determining this using various different query
commands, but they either get very complex, or I have to make a lot of
assumptions about file locations etc. It seems to me that this
information must be available at an early stage of the rpm execution,
but is there a way of obtaining it?

Why I want to do this? Well, I want to use 'make' to avoid unnecessary
re-builds, of course, but if there is a different way of doing this...

- Toralf