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  4. Issues with Building OpenCV for Android using Qt 6.4.2 on Windows 10

Issues with Building OpenCV for Android using Qt 6.4.2 on Windows 10

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  • KaguroK Kaguro

    @jsulm okay sorry these errors kinda same:

    ld: error: undefined symbol: carotene_o4t::isSupportedConfiguration()
>>> referenced by arithm.dispatch.cpp
>>>               arithm.dispatch.cpp.o:(cv::hal::add8u(unsigned char const*, unsigned int, unsigned char const*, unsigned int, unsigned char*, unsigned int, int, int, void*)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced by arithm.dispatch.cpp
>>>               arithm.dispatch.cpp.o:(cv::hal::add8s(signed char const*, unsigned int, signed char const*, unsigned int, signed char*, unsigned int, int, int, void*)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

    (the path is a little different, because I tried some changes)

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #4

    @Kaguro said in Issues with Building OpenCV for Android using Qt 6.4.2 on Windows 10:

    armeabi-v7a

    I'm not sure this is the correct ABI. Check the ABI of your Android Qt installation, it is probably v8a. ABIs must match.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    KaguroK 2 Replies Last reply
    0
    • jsulmJ jsulm

      @Kaguro said in Issues with Building OpenCV for Android using Qt 6.4.2 on Windows 10:

      armeabi-v7a

      I'm not sure this is the correct ABI. Check the ABI of your Android Qt installation, it is probably v8a. ABIs must match.

      KaguroK Offline
      KaguroK Offline
      Kaguro
      wrote on last edited by
      #5

      @jsulm Its armeabi-v7a I checked. I always build with this to android

      1 Reply Last reply
      0
      • jsulmJ jsulm

        @Kaguro said in Issues with Building OpenCV for Android using Qt 6.4.2 on Windows 10:

        armeabi-v7a

        I'm not sure this is the correct ABI. Check the ABI of your Android Qt installation, it is probably v8a. ABIs must match.

        KaguroK Offline
        KaguroK Offline
        Kaguro
        wrote on last edited by Kaguro
        #6

        @jsulm I download from there:
        https://github.com/opencv/opencv/releases/tag/4.11.0
        the "opencv-4.11.0-android-sdk" And I just use it... this can be the problem?

        jsulmJ 2 Replies Last reply
        0
        • KaguroK Kaguro

          @jsulm I download from there:
          https://github.com/opencv/opencv/releases/tag/4.11.0
          the "opencv-4.11.0-android-sdk" And I just use it... this can be the problem?

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #7

          @Kaguro Then look in the build log for linker warnings: if some libs are incompatible you will get warning.
          And as I suggested before: check which libraries provide the symbols which are not found and then check whether you link these libs.
          For example carotene_o4t::isSupportedConfiguration seems to come from libtegra_hal (see https://stackoverflow.com/questions/41665655/what-is-carotene-o4t-and-why-does-it-cause-issues-with-compiling-a-program-using).

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
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          • KaguroK Kaguro

            @jsulm I download from there:
            https://github.com/opencv/opencv/releases/tag/4.11.0
            the "opencv-4.11.0-android-sdk" And I just use it... this can be the problem?

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #8

            @Kaguro said in Issues with Building OpenCV for Android using Qt 6.4.2 on Windows 10:

            this can be the problem?

            It can if the ABIs do not match.

            https://forum.qt.io/topic/113070/qt-code-of-conduct

            KaguroK 1 Reply Last reply
            0
            • jsulmJ jsulm

              @Kaguro said in Issues with Building OpenCV for Android using Qt 6.4.2 on Windows 10:

              this can be the problem?

              It can if the ABIs do not match.

              KaguroK Offline
              KaguroK Offline
              Kaguro
              wrote on last edited by
              #9

              @jsulm
              so I try this now:

              LIBS += \
        -L"F:/Asztal/VP/mew/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/" \
        -L"F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/libs/armeabi-v7a/" \
        -L"F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/" \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_core \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_dnn \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_flann \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_highgui \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_gapi \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_ml \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_objdetect \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_photo \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_imgproc \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_imgcodecs \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_features2d \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_calib3d \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_video \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_videoio \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a -ltegra_hal \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_stitching \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a -ltbb

              And now I got "only" 15 errors for example:
              :-1: error: error: undefined symbol: android_getCpuFeatures
              :-1: error: error: undefined symbol: __itt_thread_set_name_ptr__3_0
              :-1: error: error: undefined symbol: __itt_string_handle_create_ptr__3_0
              (etc..)

              And it looks like this is from libopencv_core. But I already linked the libopencv_core

              jsulmJ 1 Reply Last reply
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              • KaguroK Kaguro

                @jsulm
                so I try this now:

                LIBS += \
        -L"F:/Asztal/VP/mew/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/" \
        -L"F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/libs/armeabi-v7a/" \
        -L"F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/" \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_core \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_dnn \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_flann \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_highgui \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_gapi \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_ml \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_objdetect \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_photo \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_imgproc \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_imgcodecs \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_features2d \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_calib3d \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_video \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_videoio \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a -ltegra_hal \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_stitching \
        -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a -ltbb

                And now I got "only" 15 errors for example:
                :-1: error: error: undefined symbol: android_getCpuFeatures
                :-1: error: error: undefined symbol: __itt_thread_set_name_ptr__3_0
                :-1: error: error: undefined symbol: __itt_string_handle_create_ptr__3_0
                (etc..)

                And it looks like this is from libopencv_core. But I already linked the libopencv_core

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #10

                @Kaguro Did you check whether there are any linker warning about incompatible libraries?
                You should also check the linker call to make sure all the libs were passed to it.

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                KaguroK 1 Reply Last reply
                0
                • jsulmJ jsulm

                  @Kaguro Did you check whether there are any linker warning about incompatible libraries?
                  You should also check the linker call to make sure all the libs were passed to it.

                  KaguroK Offline
                  KaguroK Offline
                  Kaguro
                  wrote on last edited by
                  #11

                  @jsulm Sorry I am really a beginner and I don't understand exactly what you would ask for.
                  I just see errors and this is the whole log what I see :

                  C:\Users\Kaguro\AppData\Local\Android\Sdk\ndk\23.1.7779620/toolchains/llvm/prebuilt/windows-x86_64/bin/clang++ -target armv7a-linux-androideabi23 -fno-limit-debug-info -Wl,--exclude-libs,libunwind.a -Wl,-soname,libPoorMans_thatsyou_client_armeabi-v7a.so -Wl,--build-id=sha1 -Wl,--no-undefined -Wl,-z,noexecstack -shared -o libPoorMans_thatsyou_client_armeabi-v7a.so  @object_script.libPoorMans_thatsyou_client_armeabi-v7a.so   -LF:/Asztal/VP/mew/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/ -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/libs/armeabi-v7a/ -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/ -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a -lopencv_core -lopencv_dnn -lopencv_flann -lopencv_highgui -lopencv_gapi -lopencv_ml -lopencv_objdetect -lopencv_photo -lopencv_imgproc -lopencv_imgcodecs -lopencv_features2d -lopencv_calib3d -lopencv_video -lopencv_videoio -LF:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a -ltegra_hal -lopencv_stitching -ltbb D:/Qt/6.4.2/android_armv7/lib/libQt6MultimediaWidgets_armeabi-v7a.so D:/Qt/6.4.2/android_armv7/lib/libQt6Multimedia_armeabi-v7a.so D:/Qt/6.4.2/android_armv7/lib/libQt6Widgets_armeabi-v7a.so D:/Qt/6.4.2/android_armv7/lib/libQt6Gui_armeabi-v7a.so -lEGL D:/Qt/6.4.2/android_armv7/lib/libQt6Network_armeabi-v7a.so D:/Qt/6.4.2/android_armv7/lib/libQt6Core_armeabi-v7a.so -llog -pthread -lGLESv2   -llog -lz -lm -ldl -lc
ld: error: undefined symbol: android_getCpuFeatures
>>> referenced by system.cpp
>>>               system.cpp.o:(cv::HWFeatures::initialize()) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_thread_set_name_ptr__3_0
>>> referenced by system.cpp
>>>               system.cpp.o:(cv::TLSData<cv::(anonymous namespace)::ThreadID>::createDataInstance() const) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_string_handle_create_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::LocationExtraData::LocationExtraData(cv::utils::trace::details::Region::LocationStaticStorage const&)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::Impl::leaveRegion(cv::utils::trace::details::TraceManagerThreadLocal&)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::TraceManager::TraceManager()) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced 1 more times

ld: error: undefined symbol: __itt_api_version_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::isITTEnabled()) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_domain_create_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::isITTEnabled()) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_id_create_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::Impl::Impl(cv::utils::trace::details::TraceManagerThreadLocal&, cv::utils::trace::details::Region*, cv::utils::trace::details::Region&, cv::utils::trace::details::Region::LocationStaticStorage const&, long long)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::Impl::registerRegion(cv::utils::trace::details::TraceManagerThreadLocal&)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_task_begin_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::Impl::enterRegion(cv::utils::trace::details::TraceManagerThreadLocal&)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_id_destroy_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::Impl::~Impl()) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_metadata_add_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::Impl::leaveRegion(cv::utils::trace::details::TraceManagerThreadLocal&)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::traceArg(cv::utils::trace::details::TraceArg const&, int)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::traceArg(cv::utils::trace::details::TraceArg const&, long long)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
>>> referenced 1 more times

ld: error: undefined symbol: __itt_task_end_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::Region::Impl::leaveRegion(cv::utils::trace::details::TraceManagerThreadLocal&)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_region_begin_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::TraceManager::TraceManager()) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_region_end_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::TraceManager::~TraceManager()) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_relation_add_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::parallelForAttachNestedRegion(cv::utils::trace::details::Region const&)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a

ld: error: undefined symbol: __itt_metadata_str_add_ptr__3_0
>>> referenced by trace.cpp
>>>               trace.cpp.o:(cv::utils::trace::details::traceArg(cv::utils::trace::details::TraceArg const&, char const*)) in archive F:/Asztal/VP/new/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:121: libPoorMans_thatsyou_client_armeabi-v7a.so] Error 1
15:40:32: The process "C:\Users\Kaguro\AppData\Local\Android\Sdk\ndk\23.1.7779620\prebuilt\windows-x86_64\bin\make.exe" exited with code 2.
15:40:33: Error while building/deploying project PoorMans_thatsyou_client (kit: Android Qt 6.4.2 Clang armeabi-v7a)
15:40:33: When executing step "Make"

                  The opencv and the Qt use the same armeabi-v7a.

                  1 Reply Last reply
                  0
                  • KaguroK Kaguro

                    Hi Guys!

                    I'm trying to build and use OpenCV for Android in my Qt 6.4.2 project on Windows 10, but I'm running into some issues.

                    Here’s what I’ve done so far:

                    I added OpenCV in my project (pro file) like this:

                    INCLUDEPATH += F:/Asztal/VP/OpenCV-android-sdk/sdk/native/jni/include/

LIBS += \
        -L"F:/Asztal/VP/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/" \
        -L"F:/Asztal/VP/OpenCV-android-sdk/sdk/native/libs/armeabi-v7a/" \
        -L"F:/Asztal/VP/OpenCV-android-sdk/sdk/native/staticlibs/armeabi-v7a/" \
        -lopencv_core \
        -lopencv_highgui \
        -lopencv_imgproc \
        -lopencv_imgcodecs \
        -lopencv_features2d \
        -lopencv_calib3d

                    I attempted to use OpenCV functions, like this:

                    #include <opencv2/opencv.hpp>
cv::Mat QImageToCvMat(const QImage &image) {
    return cv::Mat(image.height(), image.width(), CV_8UC4,
                   (void*)image.constBits(), image.bytesPerLine()).clone();
}

QImage CvMatToQImage(const cv::Mat &mat) {
    return QImage(mat.data, mat.cols, mat.rows, mat.step, QImage::Format_RGBA8888).copy();
}

QImage upscaleWithOpenCV(const QImage &image, int newWidth, int newHeight) {
    cv::Mat mat = QImageToCvMat(image);
    cv::Mat resizedMat;
    cv::resize(mat, resizedMat, cv::Size(newWidth, newHeight), 0, 0, cv::INTER_LANCZOS4);
    return CvMatToQImage(resizedMat);
}

//using:
QLabel *lajos = new QLabel();
QImage betterScaledImage = upscaleWithOpenCV(preview, this->width(), this->height());
lajos->setPixmap(QPixmap::fromImage(betterScaledImage));
lajos->show();

                    The include is correct because, I didnt get error then. But When I try to rebuild I get these errors:
                    2025-03-24_09h09_15.png
                    2025-03-24_09h10_24.png
                    I’ve tried different approaches, but I haven’t been able to resolve the issue. Has anyone successfully built OpenCV for Android using Qt on Windows? Any advice or guidance would be greatly appreciated!

                    Thanks in advance!

                    KaguroK Offline
                    KaguroK Offline
                    Kaguro
                    wrote on last edited by
                    #12

                    Somebody tried to use OpenCV with Qt c++ android with armeabi-v7a? I am very beginner in this kind of project, so I dont know what is the most correct way to use OpenCV with Qt Android. Has anyone tried it and succeeded?

                    jsulmJ 1 Reply Last reply
                    0
                    • KaguroK Kaguro

                      Somebody tried to use OpenCV with Qt c++ android with armeabi-v7a? I am very beginner in this kind of project, so I dont know what is the most correct way to use OpenCV with Qt Android. Has anyone tried it and succeeded?

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #13

                      @Kaguro Please post whole build log.

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                      1 Reply Last reply
                      0

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