`target_include_directories` cmake error

[godbyk]

Building jsoncpp under Jenkins results in the following output from cmake:

+ CC=/usr/bin/clang CXX=/usr/bin/clang++ cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo -DJSONCPP_WITH_CMAKE_PACKAGE=ON -DJSONCPP_LIB_BUILD_SHARED=OFF -DCMAKE_CXX_FLAGS=-fPIC -DCMAKE_INSTALL_PREFIX=/var/lib/jenkins/jobs/jsoncpp-linux/workspace/install
-- The C compiler identification is Clang 3.5.0
-- The CXX compiler identification is Clang 3.5.0
-- Check for working C compiler: /usr/bin/clang
-- Check for working C compiler: /usr/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/clang++
-- Check for working CXX compiler: /usr/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- JsonCpp Version: 1.0.0
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.3", minimum required is "2.6") 
-- Configuring done
CMake Error in src/lib_json/CMakeLists.txt:
  Target "jsoncpp_lib" INTERFACE_INCLUDE_DIRECTORIES property contains path:

    "/var/lib/jenkins/jobs/jsoncpp-linux/workspace/src/lib_json/../../include"

  which is prefixed in the source directory.

This is with cmake version 3.1.0. There may be a potentially helpful explanation at http://stackoverflow.com/a/25681179/4214.

[Gachapen]

Does this only happen while using JSONCPP_WITH_CMAKE_PACKAGE=ON? I think the stackoverflow solution might work. I'll test it soon.

[godbyk]

Testing on my local machine instead of the build server: yes, using JSONCPP_WITH_CMAKE_PACKAGE=OFF circumvents the issue. After applying your patch from issue #106, cmake stopped complaining even with JSONCPP_WITH_CMAKE_PACKAGE=ON.

[cdunn2001]

@Gachapen, thanks for the patch.

@godbyk, thanks for testing and research.