error while lammps as a shared lib

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1

Dear Alex:
i get a problem while i am trying to build lammps as a shared lib.
Here is the problem

[100%] Linking CXX executable lmp liblammps.so.0: undefined reference to PyString_FromString' liblammps.so.0: undefined reference to PyCObject_FromVoidPtr’ liblammps.so.0: undefined reference to PyInt_AsLong' liblammps.so.0: undefined reference to PyString_AsString’ liblammps.so.0: undefined reference to `PyInt_FromLong’ collect2: error: ld returned 1 exit status CMakeFiles/lmp.dir/build.make:101: recipe for target ‘lmp’ failed make[2]: *** [lmp] Error 1 CMakeFiles/Makefile2:168: recipe for target ‘CMakeFiles/lmp.dir/all’ failed make[1]: *** [CMakeFiles/lmp.dir/all] Error 2 Makefile:129: recipe for target ‘all’ failed make: *** [all] Error 2

before raise this error, I have done the following steps:

  1. download the latest version of lammps: 7 Aug 2019
  2. mkdir build && cd build
  3. cmake -C …/cmake/presets/minimal.cmake -D BUILD_LIB=on -D BUILD_SHARED_LIBS=on -D CMAKE_INSTALL_PREFIX=$VIRTUAL_ENV -D PKG_GPU=off -D PYTHON_LIBRARY=/usr/local/lib/libpython3.8.so …/cmake
  4. sudo make -j4 && sudo make install

This problem is out of what i can solve, please tell me how to figure it out; If any information you need that i omitted, i will provide it as soon as possible.
Thanks for your kindly help in advance !

Roy

2

Why do you set -D PYTHON_LIBRARY?

3

because at first CMake automatically find my old version libpython3.5.so, and I want it to get new libpython3.8.so. Then I remove it and then CMake detected 2.7.so. So I have to specify manually to this.

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4

But then you also need to provide the matching include directory or else cmake will pick up the wrong one leading to the link error.

5

Well, I might know what is going wrong. I should also add -D PYTHON_INCLOUD to specify a matching interpreter or else I am using py3 lib but still using py2 interpreter. I will try this, thank you a lot !

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