Exit status geting set on zip -uf on AIX when nothing to do

I have a build process that runs on several systems (Windows, AIX and
Solaris).  In this process, we run make that has a zip -uj command.  

Yesterday, out of the blue, this process started returning and error code
of 12 when there was nothing to update.  There were no error messages,
just an exit status of 12.  If I gave it something to update, it worked
fine.  It also continues to return a normal value (0) on the other
platforms when nothing is done.

I've seen similar problems (and AIX is notorious for this sort for some
reason), when someone has a value that isn't initialized.  I'm guessing
that the loop that processes the update is passing an uninitialized auto
return code variable to a "update" function, and when nothing gets done,
it never gets set.

Of course, it could be a platform specific feature too.



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