ROS2 minimalistic build for cpp

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Hi,

I am trying to figure out ros2-dashing bare bone packages required only for c++ programming language (no python required). I have gone through many discussion on the forum link1 link2.

I have tried the following command

$ rosinstall_generator ros_core --rosdistro dashing --deps --tar > dashing-ros_core.rosinstall
$ rosinstall_generator examples_rclcpp_minimal_publisher --rosdistro dashing --deps --tar > dashing-rcl_minimal_publisher.rosinstall

If i see the number of git repos in

 dashing-ros_core.rosinstall resulted in 141 git repos
 dashing-rcl_minimal_publisher.rosinstall resulted in 98 git repos

I can see many of the ros-visualization packages are not present as expected but cloning completely ros2 dasing git repo resulting only 85 git repos - link

I am missing some in here.

Also i see other packages like rosidl_python is present in dashing-rcl_minimal_publisher.rosinstall. How can i generate minimal packages that only correspond to c++

Thanks