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OpenCV - Library integration error

umeshraghavan79umeshraghavan79
edited September 2019 in PLCnext Technology & PLCnext Controls
Hi,


As part of my project have a requirement of using OpenCV library on PLCnext.

I Compiled and built the files for OpenCV as outlined in the blog. 

The include and the libs were generated and stored in /opt/pxc/install/include and /opt/pxc/install/lib respectively


But when did the build in eclipse, the FindOpenCV.cmake was not able to find the OpenCV_INCLUDE_DIR  and the OpenCV_LIBRARY.

Then I manually copied the include files to /usr/local/include directory, post which the Find was a success as in the logs below. However, eventually the  build is failing with the include file  #include "opencv2/core.hpp” not found error.



In the logs below, It shows that the location of the OpenCV_INCLUDE_DIR is taken as /usr/local/include as default. Not sure why this is happening, even though my include and the library files were installed under /opt/pxc/install directory


/bin/sh -c "/home/umesh/plcncli/plcncli" generate code -p"/home/umesh/eclipse-workspace/OpenCVProject" --sources "src"

Successfully generated all files with the 'code' generator for /home/umesh/eclipse-workspace/OpenCVProject.


/bin/sh -c "/home/umesh/plcncli/plcncli" generate config -p"/home/umesh/eclipse-workspace/OpenCVProject" --sources "src"

Successfully generated all files with the 'config' generator for /home/umesh/eclipse-workspace/OpenCVProject.


/bin/sh -c "/home/umesh/plcncli/plcncli" build -p"/home/umesh/eclipse-workspace/OpenCVProject" -b Release -tAXCF2152,19.6.3.22423

Requested build for targets AXCF2152,19.6.3.22423

Starting build for target AXCF2152,19.6.3.22423

Checking if CMake needs to be reconfigured...

[cmake]: -- Setting ARP_TOOLCHAIN_NATIVE_SYSROOT='/opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux'

[cmake]: -- Setting ARP_TOOLCHAIN_TARGET_SYSROOT='/opt/pxc/sdk/AXCF2152/2019.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi'

[cmake]: -- The C compiler identification is GNU 8.2.0

[cmake]: -- The CXX compiler identification is GNU 8.2.0

[cmake]: -- Check for working C compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-gcc

[cmake]: -- Check for working C compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-gcc -- works

[cmake]: -- Detecting C compiler ABI info

[cmake]: -- Detecting C compiler ABI info - done

[cmake]: -- Detecting C compile features

[cmake]: -- Detecting C compile features - done

[cmake]: -- Check for working CXX compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-g++

[cmake]: -- Check for working CXX compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-g++ -- works

[cmake]: -- Detecting CXX compiler ABI info

[cmake]: -- Detecting CXX compiler ABI info - done

[cmake]: -- Detecting CXX compile features

[cmake]: -- Detecting CXX compile features - done

[cmake]: THE CMAKE_CURRENT_SOURCE_DIR: /home/umesh/eclipse-workspace/OpenCVProject

[cmake]: PROJECT_SOURCE_DIR: /home/umesh/eclipse-workspace/OpenCVProject

[cmake]: -- Boost version: 1.63.0

[cmake]: -- Found the following Boost libraries:

[cmake]: --   regex

[cmake]: -- Found ArpProgramming: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include/plcnext  

[cmake]: -- Found OpenCV: /usr/local/include  


[cmake]: OpenCV_LIBRARY: /usr/local/lib/libopencv_core.so

[cmake]: OpenCV_INCLUDE_DIRS : /usr/local/include

[cmake]: OpenCV_LIBS :


[cmake]: -- Configuring done

[cmake]: -- Generating done

[cmake]: -- Build files have been written to: /home/umesh/eclipse-workspace/OpenCVProject/intermediate/cmake/AXCF2152,19.6.3.22423/Release



[cmake]: Scanning dependencies of target OpenCVProject

[cmake]: [ 14%] Building CXX object CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o

[cmake]: cc1plus: warning: include location "/usr/local/include" is unsafe for cross-compilation [-Wpoison-system-directories]


[cmake]: /home/umesh/eclipse-workspace/OpenCVProject/src/MyProgram.cpp:6:10: fatal error: opencv2/core.hpp: No such file or directory

[cmake]:  #include "opencv2/core.hpp"

[cmake]:           ^~~~~~~~~~~~~~~~~~


[cmake]: CMakeFiles/OpenCVProject.dir/build.make:127: recipe for target 'CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o' failed

[cmake]: compilation terminated.

[cmake]: make[2]: *** [CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o] Error 1

[cmake]: CMakeFiles/Makefile2:72: recipe for target 'CMakeFiles/OpenCVProject.dir/all' failed

[cmake]: make[1]: *** [CMakeFiles/OpenCVProject.dir/all] Error 2

[cmake]: make: *** [all] Error 2

[cmake]: Makefile:129: recipe for target 'all' failed

cmake process exited with error


Attached my CMakeLists.txt and FindOpenCV.cmake files

Please help.


Regards,

Umesh

Comments

  • Oliver PLCnext TeamOliver PLCnext Team

    Hello,

    your FindOpenCV.cmake file is not found.
    So Cmake defaults to the Operating System include directories.
    You will have to add your "external " folder to the CMAKE_MODULE_PATH i think and place high priority on it.

    But I am no expert on CMake there might be a better solution still..
    Maybe even directly adding external include to "target_include_directories".

    for Open CVs dependencies In the past i had to add something like this:

    find_package( OpenCV REQUIRED )
    include_directories( ${OpenCV_INCLUDE_DIRS} )

    find_library( AVCODEC_LIBRARY avcodec )
    find_library( AVDEVICE_LIBRARY avdevice )
    find_library( AVFILTER_LIBRARY avfilter )
    find_library( AVFORMAT_LIBRARY avformat )
    find_library( AVRESAMPLE_LIBRARY avresample )
    find_library( AVUTIL_LIBRARY avutil )
    find_library( SWRESAMPLE_LIBRARY swresample )
    find_library( SWSCALE_LIBRARY swscale )

    target_link_libraries(Rubiks2019 PRIVATE
                                        ArpDevice
                                        ArpProgramming
                                        ${OpenCV_LIBS}
                                        ${AVCODEC_LIBRARY}
                                        ${AVDEVICE_LIBRARY}
                                        ${AVFILTER_LIBRARY}
                                        ${AVFORMAT_LIBRARY}
                                        ${AVUTIL_LIBRARY}
                                        ${AVRESAMPLE_LIBRARY}
                                        ${SWRESAMPLE_LIBRARY}
                                        ${SWSCALE_LIBRARY})
  • umeshraghavan79umeshraghavan79

    I checked with the logs inside FindOpenCV.cmake - I could see that a call has been made to the FindOpenCV.cmake and post that the OpenCV_INCLUDE_DIR is populated with the include directory path value. 

    I tried removing the CmakeCache.txt and re-build and everytime the below log appears,

    Just one more thing , I found this in my CMakeError.log. Do you have any idea why this is happening?

    Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
    Compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-gcc
    Build flags: ;-march=armv7-a;-mthumb;-mfpu=neon;-mfloat-abi=hard;-mcpu=cortex-a9
    Id flags:

    The output was:
    1
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find Scrt1.o: No such file or directory
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find crti.o: No such file or directory
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find crtbeginS.o: No such file or directory
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find -lgcc
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find -lgcc_s
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find -lc
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find -lgcc
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find -lgcc_s
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find crtendS.o: No such file or directory
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/8.2.0/real-ld: cannot find crtn.o: No such file or directory
    collect2: error: ld returned 1 exit status

     

    Regards,

     

  • umeshraghavan79umeshraghavan79

    Hi ,

     

    I was able to have the FindOpenCV work, however got stuck at the compilation stage. 

     

    umesh@umesh-VirtualBox:~/eclipse-workspace/OpenCVProject/tools$ sudo ./build-OpenCVProject.sh -t "/opt/pxc/sdk/AXCF2152/2019.6" -a "2019.6.3 (19.6.3.22423 )" -n "AXCF2152"
    [sudo] password for umesh:
    Version:19.6.3.22423
    CMAKE Configure
    -- Setting ARP_TOOLCHAIN_NATIVE_SYSROOT='/opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux'
    -- Setting ARP_TOOLCHAIN_TARGET_SYSROOT='/opt/pxc/sdk/AXCF2152/2019.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi'
    -- The C compiler identification is GNU 8.2.0
    -- The CXX compiler identification is GNU 8.2.0
    -- Check for working C compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-gcc
    -- Check for working C compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-gcc -- 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: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-g++
    -- Check for working CXX compiler: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-g++ -- works
    -- Detecting CXX compiler ABI info
    -- Detecting CXX compiler ABI info - done
    -- Detecting CXX compile features
    -- Detecting CXX compile features - done
    THE CMAKE_CURRENT_SOURCE_DIR: /home/umesh/eclipse-workspace/OpenCVProject
    CMAKE_MODULE_PATH:/opt/pxc/sdk/AXCF2152/2019.6/cmake/home/umesh/eclipse-workspace/OpenCVProject/cmake
    -- Found Boost: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include (found version "1.63.0") found components: regex
    -- Found ArpProgramming: /opt/pxc/sdk/AXCF2152/2019.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include/plcnext
    Inside FindOpenCV.cmake
    Finding OpenCV_INCLUDE_DIR: /usr/local/include
    Finding OpenCV_LIBRARY:
    Found OpenCV_LIBRARY: /usr/local/lib/libopencv_core.so
    -- Found OpenCV: /usr/local/include
    Found OpenCV_LIBRARY: /usr/local/lib/libopencv_core.so
    Found OpenCV_LIBRARY: /usr/local/lib/libopencv_core.so
    Found OpenCV_INCLUDE_DIR: /usr/local/include
    Found OpenCV_LIBRARY: /usr/local/lib/libopencv_core.so
    Found OpenCV_INCLUDE_DIR: /usr/local/include
    -- Configuring done
    -- Generating done
    CMake Warning:
    Manually-specified variables were not used by the project:

    BUILD_TESTING
    USE_ARP_DEVICE

     

    -- Build files have been written to: /home/umesh/eclipse-workspace/OpenCVProject/intermediate/cmake/AXCF2152_19.6.3.22423
    [1/2] Building CXX object CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o
    FAILED: CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o
    /opt/pxc/sdk/AXCF2152/2019.6/sysroots/x86_64-pokysdk-linux/usr/bin/arm-pxc-linux-gnueabi/arm-pxc-linux-gnueabi-g++ --sysroot=/opt/pxc/sdk/AXCF2152/2019.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi -DARP_DEVICE_AXCF2152 -DOpenCVProject_EXPORTS -I../../code -I../../../src -I../../../depoly/include -I../../../deploy/include/opencv2 -I/opt/pxc/sdk/AXCF2152/2019.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include/plcnext -isystem /usr/local/include -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 -O3 -DNDEBUG -fPIC -fno-gnu-unique -MD -MT CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o -MF CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o.d -o CMakeFiles/OpenCVProject.dir/src/MyProgram.cpp.o -c ../../../src/MyProgram.cpp
    cc1plus: warning: include location "/usr/local/include" is unsafe for cross-compilation [-Wpoison-system-directories]
    In file included from ../../../src/MyProgram.cpp:12:
    /usr/local/include/opencv4/opencv2/imgcodecs.hpp:46:10: fatal error: opencv2/core.hpp: No such file or directory
    #include "opencv2/core.hpp"
    ^~~~~~~~~~~~~~~~

    Not sure, why this error, even though the file is present at the location. Please help.

     

    Regards,

    Umesh

     

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