icub-main Python bindings do not work on Windows

[traversaro]

2022-04-19T02:33:58.6045591Z   -- Installing: C:/Miniconda/envs/test/conda-bld/icub-main_1650334923373/_h_env/Library/Lib/site-packages/icub.py
2022-04-19T02:33:58.6046181Z   -- Installing: C:/Miniconda/envs/test/conda-bld/icub-main_1650334923373/_h_env/Library/Lib/site-packages/_icub.pyd

It should be:

2022-04-19T02:33:58.6045591Z   -- Installing: C:/Miniconda/envs/test/conda-bld/icub-main_1650334923373/_h_env/Lib/site-packages/icub.py
2022-04-19T02:33:58.6046181Z   -- Installing: C:/Miniconda/envs/test/conda-bld/icub-main_1650334923373/_h_env/Lib/site-packages/_icub.pyd

[traversaro]

#1072 was not complete.

[traversaro]

On Linux, this works fine:

traversaro@IITICUBLAP257:~$ mamba create -n icub-main -c conda-forge -c robotology icub-main
traversaro@IITICUBLAP257:~$ mamba activate icub-main
(icub-main) traversaro@IITICUBLAP257:~$ mamba list | grep icub-main
# packages in environment at /home/traversaro/mambaforge/envs/icub-main:
icub-main                 1.24.1          py39he6d5064_49    robotology
(icub-main) traversaro@IITICUBLAP257:~$ python
Python 3.9.12 | packaged by conda-forge | (main, Mar 24 2022, 23:22:55)
[GCC 10.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import icub
>>>

On Windows, even by setting as a workaround PYTHONPATH and PATH the bindings do not work, I guess due to some visibility issues? :

C:\Users\STraversaro>mamba create -n icub-main -c conda-forge -c robotology icub-main
C:\Users\STraversaro>mamba activate icub-main
(icub-main) C:\Users\STraversaro>set PYTHONPATH=%CONDA_PREFIX%\Library\Lib\site-packages\
(icub-main) C:\Users\STraversaro>set PATH=%PATH%;%CONDA_PREFIX%\Library\Lib\site-packages\
(icub-main) C:\Users\STraversaro>python
Python 3.9.12 | packaged by conda-forge | (main, Mar 24 2022, 23:17:03) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import icub
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\STraversaro\AppData\Local\mambaforge\envs\icub-main\Library\Lib\site-packages\icub.py", line 15, in <module>
    import _icub
ImportError: DLL load failed while importing _icub: The specified module could not be found

@Nicogene

[traversaro]

The initial problem is due to the fact that when creating conda packages on Windows we do not specify the correct directory, as we do for example in:

• https://github.com/robotology/robotology-superbuild/blob/v2022.05.2/cmake/BuildYARP.cmake#L55
• https://github.com/robotology/robotology-superbuild/blob/v2022.05.2/cmake/BuildiDynTree.cmake#L20

[traversaro]

This was fixed by robotology/icub-main#985 .