CLion外部工具输出异常：ROS的roslaunch命令无输出求助

Hey there, let's troubleshoot this ROS launch output issue in CLion together! 🛠️

The Problem Recap #

You've set up two external tools in CLion:

1. catkin build my_project – works perfectly, output shows up as expected
2. roslaunch my_project my_launch.launch – runs successfully but no output appears. Even when you remove the first tool and only keep this one, the output still doesn't show (though it worked fine before adding the catkin build tool).

Possible Fixes to Try #

1. Force Roslaunch to Output to Console

Roslaunch by default redirects node output to log files, which CLion might not capture. Add the --screen flag to your roslaunch command to force all output to print directly to the terminal:

roslaunch my_project my_launch.launch --screen

Update your external tool's "Arguments" field with this modified command and test it again.

2. Check CLion's Output Capture Settings

Double-check your roslaunch external tool configuration:

• Make sure the Capture output option is checked (this is easy to accidentally uncheck when editing configurations)
• Verify the Working directory points to your ROS workspace root (e.g., ~/catkin_ws) – incorrect paths can break output routing

3. Reset CLion's Cache

Sometimes CLion's cache gets corrupted after modifying external tools, causing odd behavior like missing output:

1. Go to File > Invalidate Caches...
2. Select Invalidate and Restart
3. Once CLion reboots, test your roslaunch tool again

4. Verify Environment Variables

Catkin build modifies ROS environment variables, which might leave behind conflicting settings for roslaunch:

• In your roslaunch tool's configuration, click the Environment Variables button
• Ensure ROS_PACKAGE_PATH and CMAKE_PREFIX_PATH correctly point to your workspace's devel directory
• Alternatively, prepend a source command to your roslaunch command to guarantee clean environment:

  source ~/catkin_ws/devel/setup.bash && roslaunch my_project my_launch.launch --screen
  

5. Recreate the Roslaunch External Tool

If all else fails, the configuration file might be damaged. Try:

1. Delete the existing roslaunch external tool entirely
2. Restart CLion
3. Create a brand new external tool from scratch, using the correct program path (e.g., /opt/ros/noetic/bin/roslaunch for Noetic) and the --screen argument as mentioned earlier

内容的提问来源于stack exchange，提问作者Hakaishin