cv_bridge_export.h import error

[vamsikalagaturu]

When used cv_bridge as #include "cv_bridge/cv_bridge/cv_bridge.h" in the package, it is throwing an error:

/opt/ros/rolling/include/cv_bridge/cv_bridge/cv_bridge.h:46:10: fatal error: cv_bridge/cv_bridge_export.h: No such file or directory
   46 | #include <cv_bridge/cv_bridge_export.h>

This is because, the cv_bridge_export.h is present in the path cv_bridge/cv_bridge/cv_bridge_export.h and the inlcude in cv_bridge.h is referring to cv_bridge/cv_bridge_export.h

A workaround for this issue:

• Remove the ros-rolling-cv-bridge package from the system.
• Clone the cv_bridge into local system and checkout to ros2 branch.
• Change the line 80 in cv_bridge/CMakeLists.txt from install(DIRECTORY include/ DESTINATION include/${PROJECT_NAME}) to install(DIRECTORY include/ DESTINATION include/)
• Change the line 26 in cv_bridge/src/CMakeLists.txt from DESTINATION include/${PROJECT_NAME}/${PROJECT_NAME}) to DESTINATION include/${PROJECT_NAME}/)
• Build the cv_bridge
• This will make the cv_bridge.h and cv_bridge_import.h be installed into install/cv_bridge/include/cv_bridge/cv_bridge.h rather than install/cv_bridge/include/cv_bridge/cv_bridge/cv_bridge.h
• Now, in the package where cv_bridge is required, import it as #include "cv_bridge/cv_bridge.h

Simultaneously, created the issue in ros-perception/vision_opencv: https://github.com/ros-perception/vision_opencv/issues/435

If the colcon build is not finding the local package, but searching in /opt/ros/version/ for cv_bridge:

• Add ${CMAKE_INSTALL_PREFIX}/../cv_bridge/include into include_directories in your package CMAKELISTS

[sthoduka]

replace ${CMAKE_INSTALL_PREFIX}/../cv_bridge/include with $ENV{COLCON_PREFIX_PATH}/cv_bridge/include so that you only need to build once. I guess the install directory for mir_object_recognition doesn't exist during the first build, so the CMAKE_INSTALL_PREFIX points to a non-existent directory.

[vamsikalagaturu]

The cv_bridge import issues are no longer occuring with the latest builds, and therefore closing the issue.