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

[vakano]

Hi, Chuck,

Thanks for the explanation, it is very clear now.

One last question is:

*folder/proj_a*
CMakeLists.txt:
add_executable(A main.cpp)
target_link_libraries(A B C)

*folder/proj_b*
CMakeLists.txt:
project(proj_b)
add_library(B proj_b.cpp)

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?

Thanks,
vakano  



Chuck Atkins wrote
>> 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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