[CMake] intercomponent link dependencies?

Nico Schlömer nico.schloemer at gmail.com
Thu Jan 7 05:51:24 EST 2010


Hi Michael,

thanks for the explanations.

I'm indeed about to write a FindModule.cmake for a library which I did
*not* write, but to certain components of which I'd like to link
against using CMake (in a clean fashion).
I'm FOREACHing through the components of the library, and upon trying to set

  ADD_LIBRARY( ${COMPONENT} )

cmake complains about

  add_library cannot create target "A" because another target with the
  same name already exists.  The existing target is a static library created
  in source directory "/path/to/A".  See
  documentation for policy CMP0002 for more details.

Okay, so it exists already? Fine. Let's then

  SET_TARGET_PROPERTIES( ${COMPONENT} PROPERTIES
LINK_INTERFACE_LIBRARIES "B;C;" )

-- but again, cmake complains that

  set_target_properties Can not find target to add properties to: A

TARGET_LINK_LIBRARIES doesn't work anyway as I'm not *building the
libraries (cmake says).

Hmmm...
Nico



On Thu, Jan 7, 2010 at 11:08 AM, Michael Wild <themiwi at gmail.com> wrote:
>
> One quick question: Are these libraries created by you? In that case you shouldn't write a FindMymodule.cmake, but a MymoduleConfig.cmake (see the documentation of find_package).
>
> Anyhow, to define the transitive link dependencies you can either use target_link_libraries(A LINK_INTERFACE_LIBRARIES B C) if your CMake is new enough, or you can use set_target_properties(A PROPERTIES LINK_INTERFACE_LIBRARIES "B;C"). Both solutions require that you use add_library(X IMPORTED) (where X = A, B and C) and set their IMPORTED_LOCATION property to the location on the file system. All of this is full automatic if you write a MymoduleConfig.cmake, because then you can use
>
> install_targets(A B C EXPORT MymoduleExports
>  ARCHIVE DESTINATION lib
>  LIBRARY DESTINATION lib
>  RUNTIME DESTINATION bin
>  PUBLIC_HEADER DESTINATION include
>  )
>
> install(EXPORT MymoduleExports
>  NAMESPACE Mymodule_
>  DESTINATION share/mymodule/cmake
>  )
>
> which will install a file ${CMAKE_INSTALL_PREFIX}/share/mymodule/cmake/MymoduleExports.cmake containing all the IMPORT stuff and which you can INCLUDE in your MymoduleConfig.cmake.
>
>
> I hope I could help a bit, otherwise tell us which case it is and I'll be able to help more.
>
> Michael
>
>


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