Python Path Changing after configure

ParaView Support
1

Hi all,
I am trying to compile the paraview 5.8.0.
mkdir build
cd build
ccmake ../
All good till now. Set the flag:
PARAVIEW_USE_PYTHON *ON
[c] configure
All passed. However cmake found
Python3_LIBRARY_RELEASE */usr/lib/libpython3.8.so
This is the python version controlled by the Linux installation.

I want to change it to my custom Intel Python.
So I changed all the following:
Python3_LIBRARY_RELEASE */path_to_intelpython3/lib/libpython3.7.so
_Python3_EXECUTABLE */path_to_intelpython3/bin/python3
_Python3_INCLUDE_DIR */path_to_intelpython3/include/python3.7m
_Python3_LIBRARY_RELEASE */path_to_intelpython3/lib/libpython3.7.so

Press configure and again everything changed back to 3.8.

My Python environment is setup correctly. I am not using any virtual environment.
When I type python in terminal, I get:
Python 3.7.4 (default, Nov 22 2019, 21:31:39) [GCC 7.3.0] :: Intel(R) Corporation on linux

Some global information:
gcc (GCC) 10.1.0
cmake version 3.17.3
linux kernel 4.19.126-1

I successfully compiled the paraview 5.6 with the same Intel Python distribution before updating GCC to the 10.1.0 version. Now the paraview 5.6 complains about somewhere in Exodus module that a function defined multiple times.

Thanks for help,
Mahdi

2

ParaView now uses the new FindPython module. You can see the documentation for how to use the new module in the CMake docs.

This was fixed more recently. https://gitlab.kitware.com/vtk/vtk/commit/a9079bdccbb2165583d6773a5ed848427e2a38a8

3

Thank you Ben.
Sorry to ask again.
To force cmake pointing towards the path I want, should I set some bash variables according to the new module, or I need edit the CmakeList and set some variable there?
Thanks again.

4

You should be able to set the “input variables” listed there with -D arguments to CMake to get it to find the Python you want it to.

1 Like
5

The @ben.boeckel solution is working.
Here is some dirty hack I did to make it work for someone with similar problem.

  1. mkdir build
  2. cd build
  3. `ccmake …/
  • Change all the flags you want, such as PARAVIEW_USE_PYTHON ON.
  1. Configure, press [c] till you receive the option [g] for Generate.
  2. Do not generate and just quit.

Now

  1. cmake ../ -DPython3_EXECUTABLE=path_to_intelpython3/bin/python3 -DPython3_LIBRARY=path_to_intelpython3/lib/libpython3.7m.so -DPython3_INCLUDE_DIR=path_to_intelpython3/include/python3.7m -D_Python3_EXECUTABLE= path_to_intelpython3/bin/python3 -D_Python3_INCLUDE_DIR=path_to_intelpython3/include/python3.7m
  2. make -j 4

Best,
Mahdi

1 Like