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genmsg contains only the abstract message generation functionality.

message_generation depends on genmsg and the specific generators for languages ROS supports out-of-the-box: gencpp, genlisp and genpy. It is similiar to the former langs / langs-dev packages.

As a message package you always want to depend on message_generation.

genmsg contains only the abstract message generation functionality.

message_generation depends on genmsg and the specific generators for languages ROS supports out-of-the-box: gencpp, genlisp and genpy. It is similiar to the former langs / langs-dev packages.

As a message package you always want to depend on message_generation.

Update: I have filled https://github.com/ros/catkin_tutorials/issues/8 to make sure the outdated tutorial gets updated.