[ITK] [ITK-users] Access to ITK_LIBRARY_DIRS during CMake

[Michael Jackson]

we need the directory for the BundleUtilities to be able to find the Itk 
libraries because the Itk libraries are built with @rpath as the 
"install_name" instead of an absolute path. I wrote the following cmake 
code:

   # get the ITKCommon library absolute path
   STRING(TOUPPER ${CMAKE_BUILD_TYPE} BUILD_TYPE_UPPER)
   get_target_property(ITK_COMMON_LIB ITKCommon 
IMPORTED_LOCATION_${BUILD_TYPE_UPPER})
   #message(STATUS "ITK_COMMON_LIB: ${ITK_COMMON_LIB}")
   # Now get the absolute PATH to that library. We assume this is the 
library directory (Which might fail on Windows)
   GET_FILENAME_COMPONENT (ITK_LIBRARY_DIRS "${ITK_COMMON_LIB}" PATH)

   #message(STATUS "ITK_LIBRARY_DIRS:\n    ${ITK_LIBRARY_DIRS}")

   # Now append that path to the SIMPLibSearchDirs property
   get_property(SIMPLibSearchDirs GLOBAL PROPERTY SIMPLibSearchDirs)
   if(NOT "${SIMPLibSearchDirs}" STREQUAL "")
     file(APPEND "${SIMPLibSearchDirs}" "${ITK_LIBRARY_DIRS};")
   endif()

I think ItkCommon is the lowest level of the Itk libraries so if we can 
find that we should be OK. If that does not exist then I am assuming Itk 
is probably not build correctly.

-- 
Mike Jackson  [mike.jackson at bluequartz.net]


Lowekamp, Bradley (NIH/NLM/LHC) [C] wrote:
> Hello,
>
> I would look at ITKConfig.cmake and ITKTargets.cmake.
>
> ITK now uses the libraries as “IMPORTED” targets with properties to specify the full path to the libraries.
>
> After that there are a variety of “rpath” complication at link and run time to ensure the correct library is loaded. I have to spend a while reading the documentation to understand the issues again.
>
> These are considered the “new” and “better” way of doing things. I would look into why you need “ITK_LIBRARY_DIRS” for you project, and then see if there is a newer and better way to now do that with imported targets or “rpaths”.
>
> HTH,
> Brad
>
>
>
>> On Sep 19, 2016, at 10:26 AM, Michael Jackson<mike.jackson at bluequartz.net>  wrote:
>>
>> I have a self built ITK 4.9.1 on OS X 10.10.5 with Xcode 7.2. I am trying to get the "ITK_LIBRARY_DIRS" but that variable seems to be empty when I run CMake. This is after I do the "FindPackage(ITK...)" cmake code. Is that variable supposed to be empty? Is there a better way to get the Library directory? I need it for one of my scripts that packages our OS X application.
>>
>> Thanks
>>
>> --
>> Michael A. Jackson
>> BlueQuartz Software, LLC
>> [e]: mike.jackson at bluequartz.net
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