[vtkusers] Python wrapping example won't build on Mac OS X

[Theodore D. Sternberg]

On Sat, 13 Mar 2004, Martin Costabel wrote:
> Theodore D. Sternberg wrote:
> > The VTK 4.4 source code ships with a small example (in
> > Examples/Build/vtkLocal) of how to add classes to VTK and get them wrapped
> > for use from Tcl and Python.  It all builds and works wonderfully on
> > Linux, but on Mac OS X there are several problems:
> 
>  From looking at cvs logs, it seems to me that the vtkLocal example (and 
> the other Examples) come from older archeological strata, below the 
> great fix for Python on Mac OS X on 28 Aug 2003. The 
> Examples/Build/vtkLocal/CMakeLists.txt just has the 2 lines
> 
>      ADD_LIBRARY(${PROJECT_NAME}Python MODULE ${vtkLocalPYTHON_SRCS})
>      TARGET_LINK_LIBRARIES(${PROJECT_NAME}Python vtkCommonPython 
> ${PROJECT_NAME})
> 
> where more recent CMakeLists.txt files have a special treatment for 
> APPLE. From Common/CMakeLists.txt:
> 
>    IF (APPLE)
>      ADD_LIBRARY(vtk${KIT}PythonD ${KitPython_SRCS} 
> ${Kit_PYTHON_EXTRA_SRCS})
>      ADD_LIBRARY(vtk${KIT}Python MODULE vtk${KIT}PythonInit.cxx)
>      TARGET_LINK_LIBRARIES(vtk${KIT}PythonD vtk${KIT} ${KIT_PYTHON_LIBS} 
> ${PYTHON_LIBRARY})
>      TARGET_LINK_LIBRARIES(vtk${KIT}Python vtk${KIT}PythonD)
>      INSTALL_TARGETS(/lib/vtk vtk${KIT}PythonD)
>    ELSE (APPLE)
>      ADD_LIBRARY(vtk${KIT}Python MODULE ${KitPython_SRCS} 
> ${Kit_PYTHON_EXTRA_SRCS})
>      TARGET_LINK_LIBRARIES (vtk${KIT}Python vtk${KIT} ${KIT_PYTHON_LIBS})
>    ENDIF(APPLE)
> 
> Did you try to change the vtkLocal/CMakeLists.txt analogously?

Good idea ;-)  Here's an attempt at doing that:

  IF (VTK_WRAP_PYTHON)
    VTK_WRAP_PYTHON2(${PROJECT_NAME}Python vtkLocalPYTHON_SRCS ${vtkLocal_SRCS})
    IF (APPLE)
      ADD_LIBRARY(${PROJECT_NAME}PythonD ${vtkLocalPYTHON_SRCS})
      ADD_LIBRARY(${PROJECT_NAME}Python MODULE ${PROJECT_NAME}PythonInit.cxx)
      TARGET_LINK_LIBRARIES(${PROJECT_NAME}PythonD ${PROJECT_NAME}
      TARGET_LINK_LIBRARIES(${PROJECT_NAME}Python ${PROJECT_NAME}PythonD)
      INSTALL_TARGETS(/lib/vtk ${PROJECT_NAME}PythonD)
    ELSE (APPLE)
      ADD_LIBRARY(${PROJECT_NAME}Python MODULE ${vtkLocalPYTHON_SRCS}
      TARGET_LINK_LIBRARIES (${PROJECT_NAME}Python vtkLocalPython ${PROJECT_NAME})
    ENDIF(APPLE)
    INSTALL_TARGETS(/lib/vtk ${PROJECT_NAME}Python)
  ENDIF (VTK_WRAP_PYTHON)

Now, something is still wrong.  Maybe you can see what it is.  When I try 
building on Mac OS X it gets pretty far and finally fails with...

Building shared library 
/Users/ted/vtk-wrap-example/build/bin/libvtkLocalPythonD.dylib...
/usr/local/bin/cmake -E remove -f /Users/ted/vtk-wrap-example/build/bin/libvtkLocalPythonD.dylib
c++ -dynamiclib   -o /Users/ted/vtk-wrap-example/build/bin/libvtkLocalPythonD.dylib 
vtkLocalExamplePython.o vtkLocalPythonInit.o vtkLocalExamplePython.o -L/Users/ted/usr/vtk/lib/vtk -L/Users/ted/vtk-wrap-example/build/bin 
-lvtkLocal -lvtkCommon -framework AppKit -lpthread -lm 
ld: multiple definitions of symbol _PyVTKClass_vtkLocalExampleNew
vtkLocalExamplePython.o definition of _PyVTKClass_vtkLocalExampleNew in section (__TEXT,__text)
vtkLocalExamplePython.o definition of _PyVTKClass_vtkLocalExampleNew in section (__TEXT,__text)
/usr/bin/libtool: internal link edit command failed

- Ted