catkin: generate_messages before building library?

asked 2013-02-15 09:15:37 -0600

TommyP
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How do I specify in the CMakeList.txt the generation of messages and building of a library. I know how to generate messages only. But when I added a library that used these message the library was compiled before the messages had been generated.

So what is the correct way to do this?

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Regardless of catkin or rosbuild, the recommended practice is to define messages in a separate package. That might or might not help with this problem.

joq ( 2013-02-15 10:23:47 -0600 )edit

Yes, I usually do that. But for now I have a package were we have not split it that way. And that would have been a working solution if I had not found a working dependency.

TommyP ( 2013-02-15 10:33:02 -0600 )edit

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answered 2013-02-15 10:26:20 -0600

TommyP
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Found the answer:

add_dependencies(CUASVNodelets lrs_cvimage_gencpp)

solved my problem in the package lrs_cvimage. For me this is not intuitive at all that I have to specify a dependency inside the package. I mean messages could always be generated before compiling.

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This Q/A might help explain it: http://answers.ros.org/question/52744/how-to-specify-dependencies-with-foo_msgs-catkin-packages/

WilliamWoodall ( 2013-02-15 11:41:34 -0600 )edit

catkin relies on native cmake for the build process, and thus add_dependencies is the only way to create a build order (other than wrapping cmake targets, which is against catkin philisophy).

KruseT ( 2013-02-15 21:20:28 -0600 )edit

Now when I have made this mistake I will probably start to think that it is natural to specify this dependency. It was just a bit annoying that it was hard to find this information. i think this should be in the tutorials since that was what I checked first.

TommyP ( 2013-02-16 11:06:37 -0600 )edit

Definitely. https://github.com/ros/catkin_tutorials/issues/4

KruseT ( 2013-02-17 06:13:06 -0600 )edit

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catkin: generate_messages before building library?

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