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What dependencies to specify in CMakeLists.txt and which to specify in package.xml?

asked 2017-04-27 08:58:09 -0500

nbro gravatar image

updated 2017-04-27 16:05:06 -0500

Even after having read this post regarding the difference between CMakeLists.xml and package.xml files (in the ROS context), I'm still not sure which dependencies should be specified in one or the other file.

I thought I needed to include (at least) in find_package (of the CMakeLists.xml) all the build dependencies (what about the other dependencies?) specified in the corresponding package.xml file, but this isn't the case, since I have a package where I'm specifying rospkg as a <build_depend> in package.xml, but if I also include rospkg in find_packages it gives me an error of the form

Could not find a package configuration file provided by "rospkg" with any of the following names:

rospkgConfig.cmake
rospkg-config.cmake

On the other hand, a package like rospy also contains C++ code and I can include it in the find_package list.

The reason to have a package.xml and also a CMakeLists.txt is mainly due to, I guess, the need to support Python and C++ in ROS, but it's not very clear, again, which dependencies need to be specified in which files.

I checked the Github repository for rospkg and, indeed, it does not contain any C++ files (if I checked correctly), and thus it wouldn't make much sense to include rospkg in CMakeLists.xml...

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answered 2017-04-27 17:40:39 -0500

ahendrix gravatar image

You should specify ALL of your dependencies in the package.xml, since this is used to determine which packages are needed to build and run your package.

Since the CMakeLists.txt is used to build your messages and C++ code, you only need to specify your message and C++ dependencies in your CMakeLists.txt.

If you're writing python code, you should also write a setup.py where you specify your python package name and python dependencies.

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But by C++ dependencies do you mean all non-catkin (external) dependencies, or do you also mean catkin packages which contain C++ code (and thus I would need to check which catkin packages have C++ code)?

nbro gravatar imagenbro ( 2017-04-27 18:39:50 -0500 )edit

By C++ dependencies, I mean any packages whose headers you #include in your code.

ahendrix gravatar imageahendrix ( 2017-04-27 18:41:54 -0500 )edit

So, basically, also catkin packages which contain C++ code which I need to include.

nbro gravatar imagenbro ( 2017-04-27 18:45:59 -0500 )edit

You say I should specify Python dependencies in the setup.py file. I read around that setup.py file isn't used as for a general Python package, but just by catkin. Is this true? By Python dependencies do you mean also catkin packages or just external Python dependencies?

nbro gravatar imagenbro ( 2017-04-27 18:46:53 -0500 )edit

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Asked: 2017-04-27 08:58:09 -0500

Seen: 369 times

Last updated: Apr 27 '17