[CMake] Sub dependencies?

[Glenn Coombs]

The target_link_libraries() command would be in the CMakeLists.txt for
library A, not the one for your executable.  The one for your executable
would just say target_link_libraries(myExe A).  And cmake would
automatically know that linking with A also means linking with png.

You say that you have 2 different versions of library A.  Does this mean
that you have 2 separate CMakeLists.txt files, one for each variant of A.
Or are both variants built by the same CMakeLists.txt ?  Either way, I would
have thought that you could add the appropriate target_link_libraries()
command.  Can you describe your current setup in a bit more detail to
explain why this approach won't work ?

On 11 August 2011 14:02, Doug <douglas.linder at gmail.com> wrote:

> How can I achieve that _without_ editing my own cmake file?
>
> What if a swap in a different library for my executable that is abi
> compatible but uses a different implemented to load images?
>
> I'm not talking hypotheticals here: I literally have two versions of the
> library that use slightly different versions of libpng (one for desktop and
> one for android) and it's extremely inconvenient to be messing around with
> my cmake file every time I change my build target.
>
> Sure I can do a giant IF(TARGET MATCHES "Android") ... ENDIF, which I guess
> is what I will do for now, but it seems like a poor solution.
>
> Edit: woops; ment that to go to the list.
>
> ~
> Doug.
>
> On Thu, Aug 11, 2011 at 7:39 PM, Glenn Coombs <glenn.coombs at gmail.com>wrote:
>
>> Add the sub dependencies that library A has with target_link_libraries():
>>
>>     target_link_libraries(A png)
>>
>> --
>> Glenn
>>
>> On 11 August 2011 10:02, Doug <douglas.linder at gmail.com> wrote:
>>
>>> Hrm... this seems like something cmake should be able to do, but I don't
>>> know how to make it work.
>>>
>>> If I have library A, that depends on a library and an executable project
>>> that depends on library A, how can the executable project resolve the sub
>>> dependencies from A?
>>>
>>> Specifically libpng in my case:
>>>
>>> I have a library that depends on libpng.
>>>
>>> I run cmake to build the library no problem.
>>>
>>> Then I try to compile a program that depends on the library and get a
>>> heap of errors like:
>>>
>>>  undefined reference to `png_set_read_fn'
>>>  etc. etc.
>>>
>>> Presumably this is something about how I depend on the library? I'm using
>>> the LibFindMacros, so my cmake module looks like this for the library:
>>>
>>> include(LibFindMacros)
>>>
>>> find_path(LIBNW_INCLUDE_DIR NAMES nw.h PATHS
>>> ${LIBNW_PKGCONF_INCLUDE_DIRS})
>>>
>>> find_library(LIBNW_LIBRARY NAMES nw PATHS ${LIBNW_PKGCONF_LIBRARY_DIRS})
>>>
>>> set(LIBNW_PROCESS_INCLUDES LIBNW_INCLUDE_DIR)
>>> set(LIBNW_PROCESS_LIBS LIBNW_LIBRARY LIBNW_LIBRARIES)
>>>
>>> libfind_process(LIBNW)
>>>
>>>  I know I can use ADD_SUBDIRECTORY to include stuff for a sub dir, but
>>> that isn't really appropriate in this case.
>>>
>>> ~
>>> Doug.
>>>
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Please keep messages on-topic and check the CMake FAQ at:
>>> http://www.cmake.org/Wiki/CMake_FAQ
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.cmake.org/mailman/listinfo/cmake
>>>
>>
>>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.cmake.org/mailman/listinfo/cmake
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.cmake.org/pipermail/cmake/attachments/20110811/fa2516a6/attachment-0001.htm>