Using a_pkg cmake extras in b_pkg cmake extras
I have a situation where I want to use CMake macros defined in a_pkg cmake extras (defined via CFG_EXTRAS) in b_pkg's cmake extras.
For this, in b_pkg I define a buildtool_export_depend on a_pkg. If I then try to build c_pkg with an buildtool_depend on b_pkg, it fails, since while trying to load the cmake extras from b_pkg the macro from a_pkg's extras is not found.
It makes sense why this would happen, since nowhere does anyone call find_package on a_pkg. But what is the correct way to deal with this?
Does it make sense to manually call find_package(a_pkg REQUIRED) in b_pkg's cmake extras file, or should there be another mechanism? Note that I do not buildtool_depend or build_depend on a_pkg in b_pkg, and therefore also don't call find_package(catkin ...) with a_pkg in the component list.
Here are the example packages: https://github.com/NikolausDemmel/tes...
Note: Try the example package with catkin_make, since catkin build seems to have an issue with buildtool_export_depend , see https://github.com/catkin/catkin_tool...
