[CMake] CMake SWIG support for nested python modules

[Bill Hoffman]

Bill Spotz wrote:
> 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?
> 

I assume you are using the macro's for swig found in UseSWIG.cmake?

You might have to create the custom commands by hand.

Information about that can be found here:
http://www.vtk.org/Wiki/CMake_FAQ#How_can_I_generate_a_source_file_during_the_build.3F

It is just a matter of using the correct swig invocation in the custom 
command to create the files where you want them.  Can post a small 
example of what you are trying right now?

-Bill