[vtk-developers] vtk-8.2.0-rc2 problem building wheels

[Sreekanth Arikatla]

Please ignore the previous email. I sent it by mistake.

On Tue, Nov 27, 2018 at 3:59 PM Sreekanth Arikatla <
sreekanth.arikatla at kitware.com> wrote:

>
> https://docs.google.com/document/d/1oNurBxXA_UCZcg_08E54fxWTe0noDnxdIX9gPw-74d8/edit#
>
> On Tue, Nov 27, 2018 at 3:01 PM Prabhu Ramachandran <
> prabhu at aero.iitb.ac.in> wrote:
>
>> Hi all,
>>
>> Here is hopefully the last of the issues I am running into, I just tried
>> to create wheels for 8.2.0-rc2 and have the following problem.
>>
>> First for some background.  Some of the VTK Python libraries seem to link
>> to the PYTHON_LIBRARY, for the wheels, we do not do this.  JC pointed this
>> out to me https://www.python.org/dev/peps/pep-0513/#libpythonx-y-so-1
>>
>> Basically, if we build wheels linking to the libpython* the wheel may not
>> work on Ubuntu/Debian which would be sad.
>>
>> In the past what we did to build the wheels is provide a dummy
>> VTKPythonPackage/scripts/internal/libpython-not-needed-symbols-exported-by-interpreter
>> and passing that.  This somehow worked by tricking CMake into thinking
>> there was a library specified but I am not sure how the linker did not
>> complain.  Anyway, when I try to build the wheels now on MacOS I get this
>> error:
>>
>> Linking CXX shared library...ib/libvtkPythonInterpreter-8.2.1.dylib
>> FAILED: lib/libvtkPythonInterpreter-8.2.1.dylib
>> : && /Library/Developer/CommandLineTools/usr/bin/c++ -O3 -DNDEBUG -arch
>> x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk
>> -mmacosx-version-min=10.9 -dynamiclib -Wl,-headerpad_max_install_names
>> -undefined dynamic_lookup  -compatibility_version 1.0.0 -current_version
>> 1.0.0 -o lib/libvtkPythonInterpreter-8.2.1.dylib -install_name
>> @rpath/libvtkPythonInterpreter-8.2.1.dylib
>> Utilities/PythonInterpreter/CMakeFiles/vtkPythonInterpreter.dir/vtkPythonInterpreter.cxx.o
>> Utilities/PythonInterpreter/CMakeFiles/vtkPythonInterpreter.dir/vtkPythonInteractiveInterpreter.cxx.o
>> -Wl,-rpath,VTKPythonPackage/VTK-osx_3.7/lib
>> VTKPythonPackage/scripts/internal/libpython-not-needed-symbols-exported-by-interpreter
>> lib/libvtksys-8.2.1.dylib lib/libvtkCommon-8.2.1.dylib && :
>> ld: file too small (length=0) file
>> 'VTKPythonPackage/scripts/internal/libpython-not-needed-symbols-exported-by-interpreter'
>> for architecture x86_64
>> clang: error: linker command failed with exit code 1 (use -v to see
>> invocation)
>>
>>
>> Right now, I am able to build wheels only by leaving the PYTHON_LIBRARY
>> entry blank.  This means that the libvtkPythonInterpreter-8.2.1.dylib does
>> indeed link to the libpythonx.y.dylib.
>>
>> However, I do notice that the other libvtk*Python*8.2.1.dylib do not link
>> to libpython.  So libvtkPythonInterpreter is the only one linking to
>> libpython. So I think maybe if a user never uses the
>> libvtkPythonInterpreter or if that is never explicitly imported or linked
>> to in any Python code, we may be fine with these wheels.  Also I see that
>> none of the Python extension modules, i.e. all the vtk*Python.so do not
>> link to libpython or to libvtkPythonInterpreter.
>>
>> Should I just ignore the libvtkPythonInterpreter and leave the
>> PYTHON_LIBRARY field blank?
>>
>> I would appreciate your thoughts on this matter. Thanks!
>>
>> cheers,
>>
>> Prabhu
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>
> --
> Sreekanth Arikatla, Ph.D.,
> Senior R&D Engineer,
> Kitware, Inc. <http://www.kitware.com>, Carrboro, NC.
>
>

-- 
Sreekanth Arikatla, Ph.D.,
Senior R&D Engineer,
Kitware, Inc. <http://www.kitware.com>, Carrboro, NC.
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