Ubuntu Linux - C++ modules and system python about robostack.github.io HOT 16 CLOSED

Also it all works fine on a WSL2 Ubuntu which is 22.04.3 LTS, but not on a native Ubuntu 23.04. I updated all the packages today to latest to make sure everything matched between the two environments as far as is possible.

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Hi @PeterS-mBryonics, have you tried the trick at the bottom of https://robostack.github.io/FAQ.html? This should work - if not, feel free to reopen.

Best, Tobi

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Heya, thanks, I gave that a go and it's still returning the same error:
CMake Error at /home/peter/mambaforge/envs/ros/share/cmake-3.26/Modules/FindPackageHandleStandardArgs.cmake:230 (message): Could NOT find Python3 (missing: Python3_NumPy_INCLUDE_DIRS NumPy) (found version "3.11.4") Call Stack (most recent call first): /home/peter/mambaforge/envs/ros/share/cmake-3.26/Modules/FindPackageHandleStandardArgs.cmake:600 (_FPHSA_FAILURE_MESSAGE) /home/peter/mambaforge/envs/ros/share/cmake-3.26/Modules/FindPython/Support.cmake:3766 (find_package_handle_standard_args) /home/peter/mambaforge/envs/ros/share/cmake-3.26/Modules/FindPython3.cmake:551 (include) /home/peter/mambaforge/envs/ros/share/rosidl_generator_py/cmake/rosidl_generator_py_generate_interfaces.cmake:24 (find_package) /home/peter/mambaforge/envs/ros/share/ament_cmake_core/cmake/core/ament_execute_extensions.cmake:48 (include) /home/peter/mambaforge/envs/ros/share/rosidl_cmake/cmake/rosidl_generate_interfaces.cmake:286 (ament_execute_extensions) CMakeLists.txt:29 (rosidl_generate_interfaces)

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It finds the wrong Python; could you please create a new environment without pip uninstalling numpy, delete all build/devel files in the colcon workspace, and try again?

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Ta, tried it, same issue with a plain "colcon build" and with "colcon build --cmake-args "-DPython_EXECUTABLE=$CONDA_PREFIX/bin/python -DPython3_EXECUTABLE=$CONDA_PREFIX/bin/python -DPYTHON_EXECUTABLE=$CONDA_PREFIX/bin/python"" (deleted build and install both times)

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I'm sorry to hear that it still does not work. I recommend avoiding the outdated FindPython3.cmake and instead using the newer FindPython.cmake that has much better support for conda. Switching is very easy, simply replacing find_package(Python3 ...) with find_package(Python ...) and then replacing e.g. Python3_INCLUDE_DIRS with Python_INCLUDE_DIRS and so forth.

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Thanks, I'll give that a go. If I'm understanding the traceback correctly that tweak should be made in:
mambaforge\envs\ros\share\rosidl_generator_py\cmake\rosidl_generator_py_generate_interfaces.cmake ?

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Ah, now I realise that it’s not in your user code but in some ROS2 package. That’s very weird!

Could you please provide a minimum working example to replicate this issue? Then I can take a look. Please also run conda env export > environment.yml and share the output so I can replicate your environment 1:1.

Thanks, Tobi

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ros2_ws.zip
ros_test_yml.zip
No worries, see attached. I followed the https://docs.ros.org/en/humble/Tutorials/Beginner-Client-Libraries/Custom-ROS2-Interfaces.html tutorial to create a c++ package to test building, and https://robostack.github.io/GettingStarted.html to create the environment (including adding the build tools)

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That's very weird. I don't have an Ubuntu 23.04 installation around, so it's hard for me to debug. In theory, if you install all build tools, there should be no difference ..

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Did a complete clean install of Ubuntu as I was having a similar issue with something else which wanted to call system python and became similarly unhappy. Still has this issue so thankfully it should be easy enough to replicate:
Fresh install of Ubuntu 23.04
Install Miniforge/Mamba
Follow steps to install Robostack
Try to build a C++ package
Next I'll try without the miniforge bit just in case it's that

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Backdated to 22.04 LTS, all good. So something changes going from 22.04 to 23.04

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I have the same problem on macos while trying to run this: https://docs.px4.io/main/en/ros/ros2_offboard_control.html#humble

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@craig-m-k - could you please provide a detailed traceback of the error? MacOS will be easier for me to replicate than the ubuntu 23.04/22.04 difference.

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Can you try passing -DPython3_FIND_STRATEGY=LOCATION as additional cmake_arg, please?

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We've confirmed that -DPython3_FIND_STRATEGY=LOCATION finds the correct Python installation, and added it to the FAQ. Closing here.

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