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It mostly is redundant.
Some system dependencies declare non-standard CMake variables, so the CMake interface does need to be spelled out explicitly somewhere, and CMakeLists.txt is a reasonable choice.
Because CMake scripts are not easy for other tools to parse, some information is duplicated in package.xml, where it is more-readily accessible.
So you need to take care of both files simultaneously? Not very efficient...
There is also this option: https://github.com/wjwwood/catkin_simple .
FYI, catkin_simple is very unstable, it might change, without warning, in the future (names, api, etc..). I would recommend forking it if you want to use it. It was never advertised because it isn't finished, it doesn't support actions or dynamic_reconfigure and has almost no documentation.
The package.xml files contain rosdep keys for system dependencies as well as ROS package names. Sadly there is simply no 1-to-1 mapping between those and the find_package() names. So any heuristic (like as it is done in catkin_simple) will never work 100% reliable. That is the reason why the developer has to specify them separately.
That is pretty stupid in my book... Unnecessary redundant redundancy. Who could take care of this flaw?
@Hendrik_SeveQ_Wiese `catkin_simple` tries to deal with this, but will fail if a caktin dependency is missing. Basically, for each `build_depend` it calls `find_package(build_depend)` and if it is not found it assumes it is a System package which either doesn't have a CMake Module or doesn't set canonical CMake variables, but it could be that it actually is a catkin package but is not present. There is no way to distinguish between the two cases.
It just did not. It gets the pkg-config information for all ROS dependencies. But for non-ROS dependencies the developer has to deal with it manually - just because there is no way to do that in a generic way.
Asked: 2013-10-07 09:26:06 -0600
Seen: 1,757 times
Last updated: Oct 07 '13
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