CMake unused variable warnings in ROS2 workspace

[spiderkeys]

Referencing some of the behavior described in #16

The behavior of automatically setting the CATKIN_INSTALL_INTO_PREFIX_ROOT variable in a ROS2-only workspace leaves you with a bunch of unused cmake variable warnings:

--- stderr: package_name                                                                                   
CMake Warning:
  Manually-specified variables were not used by the project:

    CATKIN_INSTALL_INTO_PREFIX_ROOT

I silence these in each individual project with:

unset( CATKIN_INSTALL_INTO_PREFIX_ROOT )

but was wondering if there was a way to avoid having to manually specify this in each ROS2 CMakeLists.txt to avoid the additional noise in our build logs? If not, maybe supporting compatibility with catkin_tools in a mixed workspace could be placed behind some flag/option?

[dirk-thomas]

You might want to pass the CMake option --no-warn-unused-cli if you would like to suppress this kind of CMake warning.

[dirk-thomas]

Assuming my previous comment answered your question I am going to close this ticket for now. Please feel free to continue commenting.

[ckaran]

I'm still getting these warnings, but only in some of the projects that I build. Are there any steps I can take to assist in debugging this?

[halejo-as]

Maybe you are missing the export ament_cmake in your package.xml. That works for me

<export>                               
   <build_type>ament_cmake</build_type> 
</export> 

[ckaran]

@halejo-as Thank you for the suggestion, but it appears that isn't the case (at least, from my very fast scripted analysis of the package.xml files)