Compilation errors

[hafidh561]

Hello, when I build using ubuntu 20.04, ROS2 Foxy, I get errors like this. I installed all required dependencies before like in tutorials. Thanks you

--- stderr: ros2_orbslam
/usr/bin/ld: CMakeFiles/stereo.dir/src/stereo/stereo-slam-node.cpp.o: undefined reference to symbol '_ZN2cv23initUndistortRectifyMapERKNS_11_InputArrayES2_S2_S2_NS_5Size_IiEEiRKNS_12_OutputArrayES7_'
/usr/bin/ld: /usr/local/lib/libopencv_calib3d.so.405: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/stereo.dir/build.make:217: stereo] Error 1
make[1]: *** [CMakeFiles/Makefile2:101: CMakeFiles/stereo.dir/all] Error 2
make: *** [Makefile:160: all] Error 2
---
Failed   <<< ros2_orbslam [2.13s, exited with code 2]
Aborted  <<< opencv_tests [2.74s]

[bfan1256]

Also getting this error, happening for us on 20.04 with the ros:foxy base image and OpenCV 4.2

[EndlessLoops]

Test Background: ubuntu 2204 + ros humble + opencv 4.5.4
Add the opencv lib in the CMakeLists.txt

find_package(OpenCV 4.0 QUIET)
... 
ament_target_dependencies(stereo rclcpp sensor_msgs cv_bridge message_filters ORB_SLAM2 Pangolin OpenCV)

[alsora]

The repository was developed for Ubuntu 18.04 and ROS 2 Foxy.
Any other configuration will likely require some updates and changes.

The error indicates that OpenCV is not being correctly linked, in particular the libopencv_calib3d.so library.

[ccwss007]

Add the following line to the CMakeLists.txt file under orbslam3 in the workspace:
(Preferably, add another find_package(OpenCV 4.x QUIET) above it)
Then add:
target_link_libraries(stereo-inertial ${OpenCV_LIBS})
Add this line between add_executable and ament_target_dependencies.