[CMake] CMake SWIG support for nested python modules

[Bill Hoffman]

Bill Spotz wrote:
> So I was able to solve my problem of duplicate python target names 
> generated from SWIG interface files:
> 
>   PyTrilinos/NOX/___init__.so
>   PyTrilinos/NOX/Epetra/___init__.so
> 
> by overhauling UseSWIG.cmake to take advantage of the OUTPUT_NAME 
> property of the SET_TARGET_PROPERTIES() function.
> 
> My problem now is that SWIG modules whose NAME and OUTPUT_NAME are 
> different are always built, even if they don't need to be.  Is there a 
> way to get dependencies to work in this situation?
> 
Can you provide a simple example that shows the problem?

-Bill