Bug 1979611

Description of problem:
We are building an executable and a library with part of vtk.
The library is wrongly linked to libvtkWrappingPythonCore
and is not linked to libpython3.9.so.1.0, so we get a :
"/lib64/libvtkWrappingPythonCore.so.1: undefined symbol: PyExc_ValueError" when we try to load our library.

The executable and the library are using the same code base, but the executable have also a main.cpp.
 
Version-Release number of selected component (if applicable):
vtk-9.0.1-8.fc34.src.rpm

Actual results:
for the executable:
ldd exe_name | grep ython

libvtkPythonContext2D.so.1 => /lib64/libvtkPythonContext2D.so.1
libvtkPythonInterpreter.so.1 => /lib64/libvtkPythonInterpreter.so.1
libvtkFiltersPython.so.1 => /lib64/libvtkFiltersPython.so.1
libvtkCommonPython.so.1 => /lib64/libvtkCommonPython.so.1
libvtkWrappingPythonCore.so.1 => /lib64/libvtkWrappingPythonCore.so.1
libpython3.9.so.1.0 => /lib64/libpython3.9.so.1.0  

for the library:
ldd lib_name.so | grep ython

libvtkPythonContext2D.so.1 => /lib64/libvtkPythonContext2D.so.1
libvtkPythonInterpreter.so.1 => /lib64/libvtkPythonInterpreter.so.1
libvtkFiltersPython.so.1 => /lib64/libvtkFiltersPython.so.1
libvtkCommonPython.so.1 => /lib64/libvtkCommonPython.so.1
libvtkWrappingPythonCore.so.1 => /lib64/libvtkWrappingPythonCore.so.1

Expected results:
ldd lib_name.so | grep ython
(nothing)

or (eventually)
ldd lib_name.so | grep ython

libvtkPythonContext2D.so.1 => /lib64/libvtkPythonContext2D.so.1
libvtkPythonInterpreter.so.1 => /lib64/libvtkPythonInterpreter.so.1
libvtkFiltersPython.so.1 => /lib64/libvtkFiltersPython.so.1
libvtkCommonPython.so.1 => /lib64/libvtkCommonPython.so.1
libvtkWrappingPythonCore.so.1 => /lib64/libvtkWrappingPythonCore.so.1
libpython3.9.so.1.0 => /lib64/libpython3.9.so.1.0  


Additional info:
doing the same build under Ubuntu 21.04 (and also with gcc-11)
we get :

ldd exe_name | grep ython
libvtkPythonContext2D-9.0.so.1 => /lib/x86_64-linux-gnu/libvtkPythonContext2D-9.0.so.1
libvtkPythonInterpreter-9.0.so.1 => /lib/x86_64-linux-gnu/libvtkPythonInterpreter-9.0.so.1
	libvtkFiltersPython-9.0.so.1 => /lib/x86_64-linux-gnu/libvtkFiltersPython-9.0.so.1
	libvtkCommonPython-9.0.so.1 => /lib/x86_64-linux-gnu/libvtkCommonPython-9.0.so.1
	libvtkWrappingPythonCore-9.0.so.1 => /lib/x86_64-linux-gnu/libvtkWrappingPythonCore-9.0.so.1
	libpython3.9.so.1.0 => /lib/x86_64-linux-gnu/libpython3.9.so.1.0

ldd lib_name.so | grep ython
(nothing)

note the main.cpp have:

#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <cmath>
#include <chrono>

#include "fragment/Fragment.hpp"
#include "tools/Infos.hpp"
#include "input/Input.hpp"
#include "tools/VtkReader.hpp"
#include "API/API.hpp"
#include "gasmodel/GasModel.hpp"
#include "tools/GeometryHelpers.hpp"
#include "fragment/solid/Solid.hpp"
#include "vtkUnstructuredGrid.h"
#include "vtkSmartPointer.h"

Thanks