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First of all you should not source both setup files if you don't have to (e.g. for building something like the ros1_bridge). Commonly you should only source one of the two. Otherwise you will likely run into problems where some packages (e.g. std_msgs) exist in both ROS versions.

Regarding the questions about ROS_PACKAGE_PATH and ROS_ROOT (and several others): ROS 2 doesn't use either of these variables.

First of all you should not source both setup files if you don't have to (e.g. for building something like the ros1_bridge). Commonly you should only source one of the two. Otherwise you will likely run into problems where some packages (e.g. std_msgs) exist in both ROS versions.

Regarding the questions about ROS_PACKAGE_PATH and ROS_ROOT (and several others): others like ROS_MASTER_URI, ROS_HOSTNAME, ROS_IP): ROS 2 doesn't use either of these variables.