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Both of those lines are correct for now, but the latter will be deprecated.

The _gencpp is the old style, the _generate_message_cpp target is the new name (more descriptive).

These targets are created by the generate_messages(DEPENDENCIES ...) CMake macro call. Calling add_dependencies(my_bin ${PKG_NAME}_generate_messages_cpp) just tells CMake that the ${PKG_NAME}_generate_messages_cpp target should be built before the my_bin target. It does not instruct CMake to generate your messages. So, if you are expecting this line to cause your services to be built, then that's incorrect.

See the ROS tutorials about how to get services generated:

http://www.ros.org/wiki/ROS/Tutorials/CreatingMsgAndSrv#Using_srv

Both of those lines are correct for now, but the latter will be deprecated.

The _gencpp is the old style, the _generate_message_cpp_generate_messages_cpp target is the new name (more descriptive).

These targets are created by the generate_messages(DEPENDENCIES ...) CMake macro call. Calling add_dependencies(my_bin ${PKG_NAME}_generate_messages_cpp) just tells CMake that the ${PKG_NAME}_generate_messages_cpp target should be built before the my_bin target. It does not instruct CMake to generate your messages. So, if you are expecting this line to cause your services to be built, then that's incorrect.

See the ROS tutorials about how to get services generated:

http://www.ros.org/wiki/ROS/Tutorials/CreatingMsgAndSrv#Using_srv