CMake: how to copy a Framework on Mac to the install directory (${roxlu_app_install_dir}) and change the @executable_path so that your application can link with it

CMakeLists.txt

  # EXPERIMENTAL: Copy frameworks from extern/lib/mac/frameworks, to the install dir and set the @executable paths
    # frameworks from the extern/lib/mac/frameworks dir
    # ----------------------------------------------------------------------------
    foreach(framework_name in ${roxlu_frameworks})
      set(framework_dir ${roxlu_base_dir}/extern/lib/mac/frameworks/${framework_name}.framework)

      if(IS_DIRECTORY ${framework_dir})
        set(framework_dest_dir ${roxlu_app_install_dir}/lib/)
        set(framework_file ${framework_dest_dir}${framework_name}.framework/${framework_name})
        get_filename_component(framework_file ${framework_file} ABSOLUTE)

        # copy the framework to bin/lib directory and change the @executable path of the framework which will be then used to set the search path in the executable
        file(COPY ${framework_dir} DESTINATION ${framework_dest_dir})
        add_custom_command(TARGET ${roxlu_app_name} PRE_LINK
          COMMAND ${CMAKE_INSTALL_NAME_TOOL} -id "@executable_path/lib/${framework_name}.framework/Versions/Current/${framework_name}" "${framework_file}"
          COMMENT "Changing install name"
          )

        # make sure that we link with this copied framework
        find_library(fr ${framework_name} PATHS ${framework_dest_dir})
        roxlu_add_lib(${fr})

      endif()
    endforeach()
    # ----------------------------------------------------------------------------