some progress on mac build problems

[Ben Pfaff]

I did a clean build of the same version of PSPP that you did, in
/tmp, using the login you lent me.  I saw the same problem that
you did: that command-line arguments with options cause
segfaults.

I experimented using printf()s to show the address of optarg from
various spots.  I discovered that &optarg is *different* from
different parts of the program.  (It's not just the difference
between optarg from libc and rpl_optarg from gnulib, either:
there are at least *three* different variables.)  I think that
this must have something to do with dynamic libraries and dynamic
linking: I tried reconfiguring with "--disable-shared" and that
took care of the problem.

(I actually did my experiments with the simpler tests program
tests/data/datasheet-test instead of src/ui/terminal/pspp.  The
former doesn't take quite as long to build.)

With --disable-shared, much of the testsuite passes.  It's not a
proper fix--we should figure out why the variable is
duplicated--but at least we're starting to track it down.
-- 
Ben Pfaff 
http://benpfaff.org