[ITK] link problems to library that uses ITK as external project

[Matt McCormick]

Hi Kris,

In the STIR CMake Config-file package [1], include code like:

  set(ITK_DIR "@ITK_DIR@")
  find_package(ITK REQUIRED)

where @ITK_DIR@ is set to the ITK Config-file location for the ITK
used to build STIR using the CMake configure_file command. This will
help client libraries or executables of STIR to find where ITK was
located and load the location of ITK libraries like ITKCommon.

HTH,
Matt

[1] https://cmake.org/cmake/help/v3.7/manual/cmake-packages.7.html#id1

On Sat, Dec 17, 2016 at 10:14 AM, Kris Thielemans
<kris.f.thielemans at gmail.com> wrote:
> Hi all
>
>
>
> I’m trying to add CMake export facilities to our open source library
> http://github.com/UCL/STIR. This uses ITK for IO. I succeeded in modifying
> my CMake files to “export” that when you link to my STIR-library, you also
> needs to link to the ITK libraries. However, as I have installed ITK in a
> non-standard location (I build STIR by setting ITK_DIR), so the ITK
> libraries are not automatically found by the linker. I am now getting
> linking errors in my final application (that uses STIR, and hence ITK). More
> detail below. So, what am I missing in my CMake files to “export” the
> location of the ITK libraries that were used when building STIR?
>
>
>
> I am using CMake 3.7.0 on CentOS 7 if that matters.
>
>
>
> Thanks for your help
>
>
>
> Kris Thielemans
>
>
>
> Detail:
>
> Our CMakeLists.txt files contain stuff like
>
>
>
> find_package(ITK QUIET)
>
> add_library(IO some_sources)
>
> if (ITK_FOUND)
>
>   target_link_libraries(IO ${ITK_LIBRARIES})
>
> endif()
>
>
>
> This works nicely. Now I’m putting in the necessary stuff for an external
> project to be able to link to our IO library. I’m following a scheme similar
> to
>
> https://rix0r.nl/blog/2015/08/13/cmake-guide/ (sorry, firefox claims that
> this web-site uses an invalided certificate at the moment).
>
>
>
> So I’ve added for instance
>
>
>
> install(TARGETS IO EXPORT STIRTargets DESTINATION lib)
>
>
>
> Checking the generated STIRTargets-release.cmake I see indeed that it
> contains
>
>
>
> set_target_properties(IO PROPERTIES
>
>   IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "CXX"
>
>   IMPORTED_LINK_INTERFACE_LIBRARIES_RELEASE
> "ITKCommon;lots-of-others-itk-libraries”
>
> )
>
>
>
> So, now in my final STIR application that uses STIR, I have a simple
> CMakeLists.txt with
>
>
>
> find_package(STIR 3.0.0 REQUIRED)
>
> include_directories(${STIR_INCLUDE_DIRS})
>
> add_executable(testfile testfile.cxx )
>
> target_link_libraries(testfile ${STIR_LIBRARIES})
>
>
>
> However, when building this (on Lubuntu with gcc etc) I get lots of messages
> like this
>
>
>
> /usr/bin/ld: cannot find -lITKCommon
>
>
>
> Indeed, in the generated link.txt I do not see anything that tells gcc/ld
> where the ITK libraries would be.
>
>
>
>
>
>
> _______________________________________________
> Community mailing list
> Community at itk.org
> http://public.kitware.com/mailman/listinfo/community
>