Emacs – lldb with gud-lldb.el

since gdb is disabled in latest version of mac,
it is not that easy to enable gdb.
although there is way to enable gdb, once mac os is updated, we have to search new ways again.

it seems like we have to use lldb.
there is a few ways to use lldb with UI,
such as eclipse for c/c++ with lldb plugin.

but for emacs, it has a plugin with lldb