> in your proj_a example, when target_link_librairies invoke Lib B directly > which generated in another project b, how does proj_a recognize it
> I think the reason is proj_a, b, c are all the sub directories of > project root, if no root layer, B can not be invoked in proj_a, right? > That's correct. In the example I gave, while proj_a, proj_b, and proj_c are all sub-directories of the root level, only the root level, proj_b and proj_c CMakeLists.txt files contain a separate project(...) command, which meas that proj_b and proj_c can be configured and used independently but proj_a cannot and needs to be configured from the root level where the B and C targets are, in addition to their own separate projects, both contained in the root level project(...) where A can see them. - Chuck
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