[CMake] Question about transitive dependencies

[David Cole]

I think you're looking at Visual Studio project dependencies and not link
dependencies. It should not build *without* target_link_libraries calls.
They are necessary to get correct linker command lines. add_dependencies
does not link any libraries to anything, it just guarantees project building
order...



On Thu, Dec 4, 2008 at 4:43 PM, Robert Dailey <rcdailey at gmail.com> wrote:

> On Thu, Dec 4, 2008 at 3:38 PM, Bill Hoffman <bill.hoffman at kitware.com>wrote:
>
>> Robert Dailey wrote:
>>
>>> Hi,
>>>
>>> Currently I have 3 projects named A, B, and C. A and B are both static
>>> libraries, and C is an executable. B depends on A, and C depends on B via
>>> add_dependencies(). When I generate a visual studio 9 project from this
>>> setup, how will the libraries be linked? The way I want this to work is for
>>> C to link against both A and B, and B will not link against A (Since B's
>>> dependencies should transfer to C). Is there a way to accomplish this
>>> behavior? I want to avoid using target_link_libraries for the most part
>>> because it's redundant. I'm already specifying B as a dependency of C
>>> through add_dependency(), why should I have to list B's static library file
>>> as a dependency of C's executable? Can't CMake pull this information from
>>> the call to add_dependency()?
>>>
>>>
>> Sounds like you should be using target_link_libraries instead of
>> add_dependency.
>
>
> I use target_link_libraries for only the case when I'm linking against
> libraries that are not part of the CMake project itself. After a quick test
> I found that John Doe's description of how this functions is correct. I
> tried the following CMake script:
>
> cmake_minimum_required( VERSION 2.6 )
>
> project( Z )
> add_library( Z STATIC Z.cpp )
>
> project( A )
> add_library( A STATIC A.cpp )
> add_dependencies( A Z )
>
> project( B )
> add_library( B STATIC B.cpp )
> add_dependencies( B A;Z )
>
> project( C )
> add_executable( C C.cpp )
> add_dependencies( C B )
>
> In this case, visual studio shows C to be linking against Z, A, and B. Both
> A and B, however, do not link against Z, which is exactly what I wanted.
>
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