[CMake] How to add dependency relations between libs and executable

[Chuck Atkins]

> So for this parallel project structure, an upper level cmakelist used to
> organize and setup relationship with lib A, B, C right?
>

Correct.  The top level CMakeLists.txt lets A B and C all build under a
single configuration.


One more question is, if use the upper level cmake list, lib_B , lib_C can
> be invoked directly without import in proj_a?
>

If you configure the top level project, you can always invoke make on only
the B or C targets via "make A" or "make B".  However, by having the
"project' command in the CMakeLists.txt for proj_b and proj_c, then those
can also be treated as fully independent projects of their own, meaning
they can either be configured by themselves or as a part of the top-level.

- Chuck
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