PythonFMU Raise error or warning, if pythonfmu/resources/binaries/linux64/libpythonfmu-export.so is missing

I installed pythonfmu by cloning this repository and using the provided setup.py script. On the first try I did not generate pythonfmu/resources/binaries/linux64/libpythonfmu-export.so. This led to unusable FMUs. I think it would be helpful to raise a error or warning, if a user tries to install pythonfmu via setup.py and libpythonfmu-export.so is missing.

Ideally one could entirely avoid running cmake and make and do everything in setup.py, but I have no idea whether this is possible, at all.

Current behavior (without `libpythonfmu-export.so`)

no libpythonfmu-export.so in ~/.local/lib/python3.8/site-packages/pythonfmu/

~/PythonFMU$ pip3 install --user .
Processing /home/benjamin/PythonFMU
Building wheels for collected packages: pythonfmu
  Building wheel for pythonfmu (setup.py) ... done
  Created wheel for pythonfmu: filename=pythonfmu-0.6.2-py3-none-any.whl size=34435 sha256=07d8754cb31d0e90cd8aa18fcb945a5ebb9be871b1ba6592f619eb8b4d5115c1
  Stored in directory: /tmp/pip-ephem-wheel-cache-m7xfnb8k/wheels/8a/74/0a/a66d0648873b0dc6cbc08d3ecdf5aee6f3fa271703b5d0fe3a
Successfully built pythonfmu
Installing collected packages: pythonfmu
  Attempting uninstall: pythonfmu
    Found existing installation: pythonfmu 0.6.2
    Uninstalling pythonfmu-0.6.2:
      Successfully uninstalled pythonfmu-0.6.2
Successfully installed pythonfmu-0.6.2
~/PythonFMU$ ls ~/.local/lib/python3.8/site-packages/pythonfmu/
builder.py  csvbuilder.py  default_experiment.py  deploy.py  enums.py  fmi2slave.py  __init__.py  logmsg.py  __main__.py  osutil.py  __pycache__  tests  variables.py  _version.py

Current behavior (with `libpythonfmu-export.so`)

if I run cmake etc. there is a libpythonfmu-export.so in ~/.local/lib/python3.8/site-packages/pythonfmu/

~/PythonFMU$ cd pythonfmu/pythonfmu-export/
~/PythonFMU/pythonfmu/pythonfmu-export$ mkdir build
~/PythonFMU/pythonfmu/pythonfmu-export$ cd build/
~/PythonFMU/pythonfmu/pythonfmu-export/build$ cmake ..
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Python3: /usr/bin/python3.9 (found version "3.9.0") found components: Interpreter Development 
Building pythonfmu-export for platform linux64
-- Configuring done
-- Generating done
-- Build files have been written to: /home/benjamin/PythonFMU/pythonfmu/pythonfmu-export/build
~/PythonFMU/pythonfmu/pythonfmu-export/build$ make
Scanning dependencies of target pythonfmu-export
[ 25%] Building CXX object CMakeFiles/pythonfmu-export.dir/cpp/cppfmu_cs.cpp.o
[ 50%] Building CXX object CMakeFiles/pythonfmu-export.dir/cpp/fmi_functions.cpp.o
[ 75%] Building CXX object CMakeFiles/pythonfmu-export.dir/cpp/PySlaveInstance.cpp.o
[100%] Linking CXX shared library /home/benjamin/PythonFMU/pythonfmu/resources/binaries/linux64/libpythonfmu-export.so
[100%] Built target pythonfmu-export
~/PythonFMU/pythonfmu/pythonfmu-export/build$ cd ~/PythonFMU/
~/PythonFMU$ pip3 install --user .
Processing /home/benjamin/PythonFMU
Building wheels for collected packages: pythonfmu
  Building wheel for pythonfmu (setup.py) ... done
  Created wheel for pythonfmu: filename=pythonfmu-0.6.2-py3-none-any.whl size=666965 sha256=17d2845dce4e571fd3e95ec7ea9170b38a91adad5f3149b9453c56fe81fd7091
  Stored in directory: /tmp/pip-ephem-wheel-cache-q2_azoq3/wheels/8a/74/0a/a66d0648873b0dc6cbc08d3ecdf5aee6f3fa271703b5d0fe3a
Successfully built pythonfmu
Installing collected packages: pythonfmu
  Attempting uninstall: pythonfmu
    Found existing installation: pythonfmu 0.6.2
    Uninstalling pythonfmu-0.6.2:
      Successfully uninstalled pythonfmu-0.6.2
Successfully installed pythonfmu-0.6.2
~/PythonFMU$ ls ~/.local/lib/python3.8/site-packages/pythonfmu/resources/binaries/linux64/
libpythonfmu-export.so

Expected behavior (without `libpythonfmu-export.so`)

Add a warning (or even abort), if there is no libpythonfmu-export.so.

~/PythonFMU$ pip3 install --user .
WARNING: cannot find libpythonfmu-export.so.
Processing /home/benjamin/PythonFMU
Building wheels for collected packages: pythonfmu
  Building wheel for pythonfmu (setup.py) ... done
  Created wheel for pythonfmu: filename=pythonfmu-0.6.2-py3-none-any.whl size=34435 sha256=07d8754cb31d0e90cd8aa18fcb945a5ebb9be871b1ba6592f619eb8b4d5115c1
  Stored in directory: /tmp/pip-ephem-wheel-cache-m7xfnb8k/wheels/8a/74/0a/a66d0648873b0dc6cbc08d3ecdf5aee6f3fa271703b5d0fe3a
Successfully built pythonfmu
Installing collected packages: pythonfmu
  Attempting uninstall: pythonfmu
    Found existing installation: pythonfmu 0.6.2
    Uninstalling pythonfmu-0.6.2:
      Successfully uninstalled pythonfmu-0.6.2
Successfully installed pythonfmu-0.6.2
~/PythonFMU$ ls ~/.local/lib/python3.8/site-packages/pythonfmu/
builder.py  csvbuilder.py  default_experiment.py  deploy.py  enums.py  fmi2slave.py  __init__.py  logmsg.py  __main__.py  osutil.py  __pycache__  tests  variables.py  _version.py