Revision history [back]

Why were cmake options invalid? How can I disable OpenCL, IPP and enable CV_SIMD?

I was working on Canny Edge Detector. After reading the source code, I felt like the edge detector could work in one way among IPP/OPENCL/OPENVX/CV_SIMD(which uses, TBB, I think)/the most traditional and slowest way(to work on pixels one by one). However, I only wanted it parallelCanny with CV_SIMD defined to work.

I tried to call canny function and use "std::cout << cv::getBuildInformation() << std::endl;" to see the libraries being used in the process. Then, I wrote a short CMakeLists.txt file in this way:

# project name
PROJECT(opencv_test)
# requirement of cmake version
cmake_minimum_required(VERSION 3.9)
add_compile_options(-std=c++17)

# find required opencv
find_package(OpenCV REQUIRED)

# name of executable file and path of source file
add_executable(opencv_test main.cpp)

# opencv libraries
target_link_libraries(opencv_test ${OpenCV_LIBS})

After that, I ran the program with the following command in order:

cmake -D WITH_OPENCL=OFF -D WITH_IPP=OFF -D WITH_TBB=OFF -D WITH_OPENMP=ON .
make
opencv_test

Only to be told that:

 CMake Warning:
  Manually-specified variables were not used by the project:
    WITH_IPP
    WITH_OPENCL
    WITH_OPENMP
    WITH_TBB

Then, after my program ran, the line of code

 std::cout << cv::getBuildInformation() << std::endl;

printed out exactly the same things as I ran cmake command without any options as follows (I also wrote another function to check if CV_SIMD is enabled):

    ==================  macro dump  ===================
CV_SIMD is NOT defined

SIMD intrinsics are not available. Check compilation target and passed build options.
=====================  done  ======================

General configuration for OpenCV 4.1.1 =====================================
  Version control:               unknown

      Extra modules:
        Location (extra):            /tmp/opencv-20190826-34514-r5q5gz/opencv-4.1.1/opencv_contrib/modules
        Version control (extra):     unknown

  Platform:
    Timestamp:                   2019-08-26T13:40:01Z
    Host:                        Darwin 18.6.0 x86_64
    CMake:                       3.15.2
    CMake generator:             Unix Makefiles
    CMake build tool:            /usr/local/Homebrew/Library/Homebrew/shims/mac/super/gmake
    Configuration:               Release

  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3 SSSE3 SSE4_1 POPCNT SSE4_2
      requested:                 DETECT
      disabled:                  AVX AVX2


Dispatched code generation:  FP16 AVX AVX2 AVX512_SKX
      requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
      FP16 (0 files):            + FP16 AVX
      AVX (4 files):             + AVX
      AVX2 (27 files):           + FP16 FMA3 AVX AVX2
      AVX512_SKX (2 files):      + FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang++  (ver 10.0.1.10010046)
    C++ flags (Release):         -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin   -fsigned-char -W -Wall 
Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden -DNDEBUG  -DNDEBUG
    C++ flags (Debug):           -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    C Compiler:                  /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang
    C flags (Release):           -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin   -fsigned-char -W -Wall -
Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden -DNDEBUG  -DNDEBUG
    C flags (Debug):             -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections  -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    Linker flags (Release):      -Wl,-dead_strip  
    Linker flags (Debug):        -Wl,-dead_strip  
    ccache:                      NO
    Precompiled headers:         NO
    Extra dependencies:
        3rdparty dependencies:

  OpenCV modules:
    To be built:                 aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 quality reg rgbd saliency sfm shape stereo stitching structured_light superres surface_matching text tracking video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis ts viz
    Applications:                apps
    Documentation:               NO
    Non-free algorithms:         YES

 GUI: 
    Cocoa:                       YES

  Media I/O: 
    ZLib:                        /usr/lib/libz.dylib (ver 1.2.11)
    JPEG:                        build-libjpeg-turbo (ver 2.0.2-62)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         /usr/local/lib/libpng.dylib (ver 1.6.37)
    TIFF:                        /usr/local/lib/libtiff.dylib (ver 42 / 4.0.10)
    OpenEXR:                     /usr/local/lib/libImath.dylib /usr/local/lib/libIlmImf.dylib /usr/local/lib/libIex.dylib /usr/local/lib/libHalf.dylib /usr/local/lib/libIlmThread.dylib (ver 2.3.0)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    FFMPEG:                      YES
      avcodec:                   YES (58.35.100)
      avformat:                  YES (58.20.100)
      avutil:                    YES (56.22.100)
      swscale:                   YES (5.3.100)
      avresample:                YES (4.0.0)
    AVFoundation:                YES

  Parallel framework:            TBB (ver 2019.0 interface 11008)

  Trace:                         YES (with Intel ITT)
  Other third-party libraries:
    Intel IPP:                   2019.0.0 Gold [2019.0.0]
           at:                   /tmp/opencv-20190826-34514-r5q5gz/opencv-4.1.1/build/3rdparty/ippicv/ippicv_mac/icv
    Intel IPP IW:                sources (2019.0.0)
              at:                /tmp/opencv-20190826-34514-r5q5gz/opencv-4.1.1/build/3rdparty/ippicv/ippicv_mac/iw
    Lapack:                      YES (/usr/local/opt/openblas/lib/libopenblas.dylib)
    Eigen:                       YES (ver 3.3.7)
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)

  OpenCL:                        YES (no extra features)
    Include path:                NO
    Link libraries:              -framework OpenCL

  Python 2:
    Interpreter:                 /usr/local/opt/python@2/bin/python (ver 2.7.16)
    Libraries:                   /

usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib (ver 2.7.16)
    numpy:                       /usr/local/lib/python2.7/site-packages/numpy/core/include (ver 1.16.4)
    install path:                lib/python2.7/site-packages/cv2/python-2.7

  Python 3:
    Interpreter:                 /usr/local/opt/python/bin/python3 (ver 3.7.4)
    Libraries:                   /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin/libpython3.7.dylib (ver 3.7.4)
    numpy:                       /usr/local/lib/python3.7/site-packages/numpy/core/include (ver 1.16.4)
    install path:                lib/python3.7/site-packages/cv2/python-3.7

  Python (for build):            /usr/local/opt/python@2/bin/python

  Java:                          
    ant:                         NO
    JNI:                         /Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include /Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin /Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include
    Java wrappers:               NO
    Java tests:                  NO

  Install to:                    /usr/local/Cellar/opencv/4.1.1
-----------------------------------------------------------------

I also tried many other options such as to write "set(WITH_OPENCL OFF)" in CMakeLists.txt or "setUseOptimized(false);" in my main function. But none of them worked. I wonder what caused the above situation where OPENCL and IPP can never be disabled but CV_SIMD can never be enabled? Is it because I misunderstand anything and use Cmake + its options in a wrong way? How can I correct it? Or is it because I was using OPENCV 4.1.1 and CMake 3.15 (both of which are new versions) and my operating system is macOS 10.15, which is a quite buggy system?

Could anyone please offer me some hints, such as to correct my understanding in Canny source code, or, more importantly, to show me how to disable OPENCL/IPP and other modules except OPENMP, and check whether those options take effect after that?

Thanks a lot for any possible hints!