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1

How do I generate a dynamic config module that depends on a message defined in the same package?

asked 2017-12-22 17:58:11 -0500

joq
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The CMakeLists.txt looks like this:

add_message_files(DIRECTORY msg FILES SensorLevels.msg)
generate_messages()
generate_dynamic_reconfigure_options(cfg/Camera1394.cfg)
catkin_package(CATKIN_DEPENDS dynamic_reconfigure message_runtime etc...)

The build fails the first time, like this:

Errors     << camera1394:make /home/joq/ros/ws/logs/camera1394/build.make.009.log                
Traceback (most recent call last):
  File "/home/joq/ros/ws/src/camera1394/cfg/Camera1394.cfg", line 37, in <module>
    from camera1394.msg import SensorLevels
ImportError: No module named msg
make[2]: *** [/home/joq/ros/ws/devel/.private/camera1394/include/camera1394/Camera1394Config.h] Error 1
make[1]: *** [CMakeFiles/camera1394_gencfg.dir/all] Error 2

Running the build again succeeds. Somehow, I need to force gencfg to wait on message generation.

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answered 2017-12-22 22:21:06 -0500

Dirk Thomas
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You will need to add an explicit dependency in CMake between the two steps to ensure that the message generation happens before the .cfg file is being invoked.

dynamic_reconfigure uses the OUTPUT signature a add_custom_command which is not a CMake target and can therefore not easily be dependent on. I think generate_dynamic_reconfigure_options would need to support an optional parameter to pass the expected header file <somewhere>/include/camera1394/Camera1394Config.h here: https://github.com/ros/dynamic_reconf...

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Thanks, Dirk. I suspected that was the case, but wanted to ask before giving up on that approach.

joq ( 2017-12-23 10:04:57 -0500 )edit

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Asked: 2017-12-22 17:58:11 -0500

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Last updated: Dec 22 '17

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