Why do I receive: Error using ros.internal.ROSProjectBuilder/buildPackage (line 534) Error building package: build log.
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Identifying message files in folder 'D:/Documents/MATLAB/Examples/R2021a/ros/ROS2CustomMessagesExample/custom'.Done.
Validating message files in folder 'D:/Documents/MATLAB/Examples/R2021a/ros/ROS2CustomMessagesExample/custom'.Done.
[3/3] Generating MATLAB interfaces for custom message packages... Done.
Running colcon build in folder 'D:/Documents/MATLAB/Examples/R2021a/ros/ROS2CustomMessagesExample/custom/matlab_msg_gen/win64'.
Build in progress. This may take several minutes...
Error building package: build log.
buildPackage(builder, , ' --merge-install', colconMakeArgs); %other messages might need to be present in the same directory
Cam Salzberger on 21 Jul 2021
The key part of the error message in the log file is right here:
Path: <...> exceeds the OS max path limit. The fully qualified file name must be less than 260 characters.
The issue is that colcon creates a rather large folder and file heirarchy when doing any kind of package build. If the path to the initial folder is any kind of reasonable length, it may run ito the Windows limitation of 260 characters. Linux and Mac don't have that issue.
I'd suggest either creating a new folder with a shorter path (like D:/ros2) and copying the example files into there for testing, or mapping a network drive to the examples folder and changing directory so that you use that mapped network drive.