[ros2] colcon failed to build ros2 wrapper

[Martzi]

System: ubuntu focal, x64
ROS: ros2 galaxy
SDK: librealsense2=2.51.1-0~realsense0.7526

My problem is that I tried to compile ros2 wrapper with colcon, but I get the following error. I tried with all the different branches for ros2 (ros2-development, ros2-legacy, old/ros2-511) both fail at the same place.

CMake Error at /home/ubuntu/docker-home/robot_ws/install/realsense2_camera_msgs/share/realsense2_camera_msgs/cmake/ament_cmake_export_targets-extras.cmake:18 (message):
  Failed to find exported target names in
  '/home/ubuntu/docker-home/robot_ws/install/realsense2_camera_msgs/share/realsense2_camera_msgs/cmake/realsense2_camera_msgs__rosidl_generator_cExport.cmake'
Call Stack (most recent call first):
  /home/ubuntu/docker-home/robot_ws/install/realsense2_camera_msgs/share/realsense2_camera_msgs/cmake/realsense2_camera_msgsConfig.cmake:41 (include)
  CMakeLists.txt:93 (find_package)

[MartyG-RealSense]

Hi @Martzi The wrapper names were changed 3 days ago at the time of writing this, as described at #2527

Have you previously been able to install the ROS2 wrapper on Galactic before this change, please?

[Martzi]

Hi!
I just tried this yesterday and today and the error is the same.

[MartyG-RealSense]

I will highlight your case to the RealSense ROS team. Thanks very much for your patience.

The address /home/ubuntu/docker-home/robot_ws refers to Docker. Can you confirm whether you are using Docker, please?

[Martzi]

Yes, I forgot to mention that. It is inside a docker image. Should I give additional details about that?

[MartyG-RealSense]

Yes please, additional details about your docker image are welcome in case it is a factor in your problem.

[Martzi]

i use dorowu/ubuntu-desktop-lxde-vnc:focal as a base image https://hub.docker.com/r/dorowu/ubuntu-desktop-lxde-vnc

I cloned the UR ros2 repo locally, copy to the docker environment and build there with colcon.

RUN mkdir -p /home/ubuntu/docker-home/robot_ws/src

ENV COLCON_WS=/home/ubuntu/docker-home/robot_ws

WORKDIR /home/ubuntu/docker-home/robot_ws

COPY /docker-home/robot_ws/src /src

RUN colcon build --cmake-args -DCMAKE_BUILD_TYPE=Release

[MartyG-RealSense]

Does it make any difference if you simply use colcon build instead of adding the Release arg, since the official instructions only specify colcon build

https://github.com/IntelRealSense/realsense-ros#step-5-build

Also, have the rosdep dependencies in Step 4 been installed?

https://github.com/IntelRealSense/realsense-ros#step-4-install-dependencies

[SamerKhshiboun]

Hey @Martzi ,
Can you please tell me what is the cmake version ? (cmake --version)
Because if it is 3.24.0 and above, you might face a problem as I issued here:
actions/runner-images#6179 (comment)
You should make sure your docker image has a lower cmake version or has a cmake version that includes the fix like this one:
ament/ament_cmake#395

[Martzi]

Also, have the rosdep dependencies in Step 4 been installed?

Yes, Step 4 also done

Can you please tell me what is the cmake version ? (cmake --version)

Thanks for the question, I am using Cmake 3.8 so definitely above 3.24. I will check it on later if it is the issue and reply!

[MartyG-RealSense]

Hi @Martzi Do you have an update about this case that you can provide, please? Thanks!

[Martzi]

Hi, sorry for the late reply.

Finally I have time to test it out and yes, it was really the cmake version mismatch, it really does not prefer above 3.24.0.
Thans @SamerKhshiboun and @MartyG-RealSense !

[MartyG-RealSense]

You are very welcome, @Martzi - it's excellent news that the problem is resolved. Thanks very much for the update!