[CMake] CMake SWIG support for nested python modules

[Bill Spotz]

Hello,

I am the developer of PyTrilinos, the python interface to Trilinos and  
I have hit upon some unexpected behavior.

I am trying to wrap the interface to NOX, which utilizes nested  
namespaces.  I shadow this structure in python by utilizing nested  
modules.  For example, a subset of the NOX namespace structure is  
given by

   NOX
     Abstract
     StatusTest
     Solver
     Epetra
       Interface

My goal, which I had previously achieved under an autotools/distutils  
hybrid build system, is to generate the following directory structure:

   NOX/__init__.py
       Abstract.py
       StatusTest.py
       Solver.py
       Epetra/__init__.py
              Interface.py

To do this, I have the following swig interface files:

   NOX.__init__.i
   NOX.Abstract.i
   NOX.StatusTest.i
   NOX.Solver.i
   NOX.Epetra.__init__.i
   NOX.Epetra.Interface.i

The problem I am running into seems to be associated with the "."  
characters in the swig interface filenames.  I get several invocations  
of the swig executable working on NOX.__init__.i that produce  
NOXPYTHON_wrap.cxx.  Is there a way around this behavior?

Thanks

** Bill Spotz                                              **
** Sandia National Laboratories  Voice: (505)845-0170      **
** P.O. Box 5800                 Fax:   (505)284-0154      **
** Albuquerque, NM 87185-0370    Email: wfspotz at sandia.gov **