Add a dependency between top-level targets.
Make a top-level
<target> depend on other top-level targets to
ensure that they build before
<target> does. A top-level target
is one created by one of the
(but not targets generated by CMake like
DEPENDS option of
add_custom_command() commands for adding file-level
dependencies in custom rules. See the
source file property to add file-level dependencies to object files.