How to link and include zenoh-cpp in another project CMakeLists.txt?

[lucasw]

Some of the things I've tried are in lucasw/ros_one2z#2 - I think have zenoh-cpp built and installed correctly and have a libzenohc.so and zenohc.hxx, zenoh.h, and zenoh.hxx, some lib/cmake zenoh files (but they don't provide a zenoh_INCLUDE_DIRECTORY or similar? I had to specify the include path on the cmake command line for my project) in my custom install destination, but I'm not sure what to put in my CMakeLists.txt to find and link to it.

Should it be something like this?

find_package(zenohcxx REQUIRED COMPONENTS zenohcxx::zenohc::lib)
...
include_directories(???)
...
target_link_libraries(my_executable PUBLIC zenohcxx::zenohc::lib ${catkin_LIBRARIES})

(It seems like zenoh-c and zenoh-cpp ought to install to include/zenoh/ rather than include/, and files should do #include <zenoh/zenoh.hxx> instead of #include <zenoh.hxx>)

Currently with that I get

Target "zenoh_generate_image" links to:

    zenohcxx::zenohc::lib

  but the target was not found.  Possible reasons include:

[milyin]

The problem seems to be that zenoh-c was not included before. The zenoh-cpp is a wrapper for zenoh-c and zenoh-pico and can work without any of these components. If zenoh-c is missing, the target zenohcxx::zenohc::lib is not defined too. See https://github.com/eclipse-zenoh/zenoh-cpp/blob/main/CMakeLists.txt#40, same logic is in the installed package.

There is issue about insufficient diagnostic when required library is not included: eclipse-zenoh/zenoh-cpp#58

There are also few examples of simplest possible CMakeLists.txt's for zenoh-cpp: https://github.com/eclipse-zenoh/zenoh-cpp/tree/main/examples/simple

[lucasw]

Thanks, I got this working

https://github.com/lucasw/ros_one2z/blob/zenoh/ros1_example_pkg/CMakeLists.txt

after this install

https://github.com/lucasw/ros_one2z/tree/zenoh#install

Need to find_package on both zenohc and zenohcxx for the zenohcxx::zenohc::lib to work:

find_package(zenohc REQUIRED)
find_package(zenohcxx REQUIRED)