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

[Sander Niemeijer]

You should at least link against the vtkCommonPythonD library, since 
this contains the VTK Python Utility code (from 
VTK/Common/vtkPythonUtil.cxx). If you are deriving classes from other 
VTK classes you probably also need to link against the vtk*PythonD 
libraries that contain the Python wrappings for the base classes.

Regards,
Sander

On maandag, maa 15, 2004, at 20:47 Europe/Amsterdam, Theodore D. 
Sternberg wrote:

> On Mon, 15 Mar 2004, Theodore D. Sternberg wrote:
>> 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
>
> Clearly, the immediate problem here is that vtkLocalExamplePython.o
> appears twice on the link line.  Maybe vtkLocalExamplePython.cxx is
> somehow winding up twice in ${vtkLocalPYTHON_SRCS}?
>
> If I remove (via cut & paste -- but I'd welcome a solution via the
> CMakeLists file) one of those vtkLocalExamplePython.o's from the link
> line, it then complains about not finding a bunch of Python library
> functions -- _PyArg_ParseTuple and such.  So I added "-framework 
> Python"
> to the link line.  That cut down the number of undefined symbols to a
> bunch that are supposed to come from VTK -- _PyArg_VTKParseTuple,
> _PyVTKClass_Check, ...
>
>
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