Compiling OpenCV for iOS fails - Cmake fails

Question

I try to compile OpenCV for ios. I get these errors all the time. I tried it with different versions of opencv, but the result is the same.

I run this: python platforms/ios/build_framework.py ios_opencv_build

I have python, cmake and g++ compilers installed. Does anyone have an idea what these errors mean and what I should do to compile successfully?

  -- Setting up iPhoneOS toolchain
    -- iPhoneOS toolchain loaded
    -- Setting up iPhoneOS toolchain
    -- iPhoneOS toolchain loaded
    -- The CXX compiler identification is Clang 5.1.0
    -- The C compiler identification is Clang 5.1.0
    -- Performing Test HAVE_CXX_FSIGNED_CHAR
    CMake Error at /opt/local/share/cmake-2.8/Modules/CMakeCXXInformation.cmake:37 (get_filename_component):
      get_filename_component called with incorrect number of arguments
    Call Stack (most recent call first):
      CMakeLists.txt:3 (PROJECT)


    CMake Error: Internal CMake error, TryCompile configure of cmake failed
    -- Performing Test HAVE_CXX_FSIGNED_CHAR - Failed
    -- Performing Test HAVE_C_FSIGNED_CHAR
    CMake Error at /opt/local/share/cmake-2.8/Modules/CMakeCInformation.cmake:37 (get_filename_component):
      get_filename_component called with incorrect number of arguments
    Call Stack (most recent call first):
      CMakeLists.txt:3 (PROJECT)


    CMake Error: Internal CMake error, TryCompile configure of cmake failed
    -- Performing Test HAVE_C_FSIGNED_CHAR - Failed
    -- Performing Test HAVE_CXX_W
    CMake Error at /opt/local/share/cmake-2.8/Modules/CMakeCXXInformation.cmake:37 (get_filename_component):
      get_filename_component called with incorrect number of arguments
    Call Stack (most recent call first):
      CMakeLists.txt:3 (PROJECT)
...

Answer 1

It seems like problem with old version of CMake. Try updating to newest CMake available from their website (which OS version and CMake version do you use?)

See also: http://answers.opencv.org/question/6789/problem-with-installation-opencv/ and this (I think this problem was similar): https://github.com/urho3d/Urho3D/issues/308