A question about Modification of package.xml

[kailin.tong]

Dear all,

In the example of a package.xml, the std_msgs is included in build_depend. Is this necessary?
As it says:

• Note that you haven’t imported the std_msgs package anywhere. But you can use the messages declared there in your custom .actions. That’s because this package forms part of the roscore file systems, so therefore, it’s embedded in the compilation protocols, and no declaration of use is needed.*

  <build_depend>std_msgs</build_depend>
  

And when I simply put all dependences on catkin_create_pkg, like:
catkin_create_pkg example_pkg rospy actionlib actionlib_msgs std_msgs
Does this have some side effects?

thank you in advance!

BR,
Kailin

[bayodesegun]

@kailin.tong

In the example of a package.xml, the std_msgs is included in build_depend. Is this necessary?

Yes, please see the post below:

Questions about package.xml

Could you please explain: the difference between <build_depend> and <build_export_depend> As I understand actionlib is needed to build .action messages and give action functionality. Is that correct? What is the difference in actionlib and actionlib_msgs when do I have to include std_msgs and nav_msgs etc. in the package.xml and when not? Do I not have to import std_msgs in my .py files if I have it in ***<exec_depend>***?

@kailin.tong

And when I simply put all dependences on catkin_create_pkg, like:
catkin_create_pkg example_pkg rospy actionlib actionlib_msgs std_msgs
Does this have some side effects?

None that I know of .