OpenCV4Android支援三種使用方式 1.Java層呼叫 2.NDK呼叫動態庫（方便，但是會包含整個.so庫） 3.NDK呼叫靜態庫（靈活，比如沒有用到機器學習模組，libopencv_ml.a裡的程式碼是不會打包到動態庫裡的） 通過連結靜態庫的方式使用OpenCV4Android，CMAKE配置如下

#############################prepare for using of opencv static library####################
#first step to use opencv
set(OpenCV_STATIC ON)
#second step to use opencv
set(OpenCV_DIR C:/sdk/opencv-3.4.2-android-sdk/sdk/native/jni)
#third step to use opencv
find_package(OpenCV REQUIRED)
###########################################################################################
##################################################the native-lib shared library############
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
        native-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        src/main/cpp/native-lib.cpp)

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
        log-lib

        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
        native-lib

        #foutth step to use opencv link opencv
        ${OpenCV_LIBS}
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})
######################################################################################
 

僅僅是新建專案稍稍修改了native-lib.cpp的程式碼，在函式裡用了下opencv的函式

#include <jni.h>
#include <string>
#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc_c.h"

extern "C" JNIEXPORT jstring JNICALL
Java_com_example_useprebuiltstaticlibrary_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello="hello";
    cv::Mat m=cv::Mat::eye(3,3,CV_8UC1);
    return env->NewStringUTF(hello.c_str());
}
 

編譯時卻報錯

Build command failed.
Error while executing process C:\sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {--build C:\sdk\demo\usePrebuiltStaticLibrary\app\.externalNativeBuild\cmake\debug\armeabi-v7a --target native-lib}
[1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o
[2/2] Linking CXX shared library ..\..\..\..\build\intermediates\cmake\debug\obj\armeabi-v7a\libnative-lib.so
FAILED: cmd.exe /C "cd . && C:\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe  --target=armv7-none-linux-androideabi23 --gcc-toolchain=C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64 --sysroot=C:/sdk/ndk-bundle/sysroot -fPIC -isystem C:/sdk/ndk-bundle/sysroot/usr/include/arm-linux-androideabi -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -mthumb -mfpu=neon -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -std=c++11 -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot C:/sdk/ndk-bundle/platforms/android-23/arch-arm -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--fix-cortex-a8 -Wl,--exclude-libs,libunwind.a -LC:/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ..\..\..\..\build\intermediates\cmake\debug\obj\armeabi-v7a\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o  C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_highgui.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_features2d.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_shape.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_imgcodecs.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_ml.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_videoio.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_dnn.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_flann.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_objdetect.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_calib3d.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_video.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_superres.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_photo.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_imgproc.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_stitching.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_videostab.a -llog C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/liblibprotobuf.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_calib3d.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_features2d.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_highgui.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_videoio.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_imgcodecs.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/liblibjpeg-turbo.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/liblibwebp.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/liblibpng.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/liblibtiff.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/liblibjasper.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/libIlmImf.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_flann.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_video.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_photo.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_imgproc.a C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a -lz C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/libtbb.a -lc C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/libcpufeatures.a -ldl -lm -llog C:/sdk/opencv-3.4.2-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a/libtegra_hal.a -latomic -lm "C:/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libc++_static.a" "C:/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libc++abi.a" "C:/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libunwind.a" "-ldl" && cd ."
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*) [clone .part.13]: error: undefined reference to 'std::basic_ios<char, std::char_traits<char> >::clear(std::_Ios_Iostate)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(std::_Ios_Openmode)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::ostream::put(char)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::ostream::flush()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::ostream::put(char)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::ostream::flush()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::locale::~locale()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::ios_base::~ios_base()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::ctype<char>::_M_widen_init() const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::ctype<char>::_M_widen_init() const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::__throw_bad_cast()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_stringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::string::_Rep::_M_destroy(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::string::_Rep::_M_destroy(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::__throw_bad_cast()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::string::_Rep::_M_dispose(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'std::string::_Rep::_S_empty_rep_storage'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'vtable for std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'vtable for std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'vtable for std::basic_streambuf<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'VTT for std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::Exception::formatMessage(): error: undefined reference to 'vtable for std::basic_ios<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(std::_Ios_Openmode)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::locale::~locale()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::ios_base::~ios_base()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(std::_Ios_Openmode)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::locale::~locale()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::ios_base::~ios_base()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_stringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::string::_Rep::_M_dispose(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::string::_Rep::_M_destroy(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::string::_Rep::_M_destroy(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_stringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::string::_Rep::_M_dispose(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'std::string::_Rep::_S_empty_rep_storage'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'vtable for std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'vtable for std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'vtable for std::basic_streambuf<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'VTT for std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'vtable for std::basic_ios<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function std::vector<void*, std::allocator<void*> >::_M_fill_insert(__gnu_cxx::__normal_iterator<void**, std::vector<void*, std::allocator<void*> > >, unsigned int, void* const&): error: undefined reference to 'std::__throw_length_error(char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function _GLOBAL__sub_I_system.cpp: error: undefined reference to 'std::ios_base::Init::Init()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(system.cpp.o):system.cpp:function _GLOBAL__sub_I_system.cpp: error: undefined reference to 'std::ios_base::Init::~Init()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*) [clone .part.44]: error: undefined reference to 'std::basic_ios<char, std::char_traits<char> >::clear(std::_Ios_Iostate)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf(): error: undefined reference to 'std::locale::~locale()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf(): error: undefined reference to 'std::string::_Rep::_S_empty_rep_storage'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf(): error: undefined reference to 'vtable for std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf(): error: undefined reference to 'vtable for std::basic_streambuf<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf(): error: undefined reference to 'std::string::_Rep::_S_empty_rep_storage'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf(): error: undefined reference to 'vtable for std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf(): error: undefined reference to 'vtable for std::basic_streambuf<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream(std::_Ios_Openmode)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'std::ios_base::~ios_base()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'VTT for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned char>(cv::Mat const&): error: undefined reference to 'vtable for std::basic_ios<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream(std::_Ios_Openmode)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<double>(double)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<double>(double)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<double>(double)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<double>(double)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'VTT for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<float>(cv::Mat const&): error: undefined reference to 'vtable for std::basic_ios<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<double>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream(std::_Ios_Openmode)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<double>(cv::Mat const&): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<double>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<double>(cv::Mat const&): error: undefined reference to 'vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<double>(cv::Mat const&): error: undefined reference to 'VTT for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream(std::_Ios_Openmode)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(short)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(short)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(short)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'std::ostream::operator<<(short)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<short>(cv::Mat const&): error: undefined reference to 'VTT for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned short>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<unsigned long>(unsigned long)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned short>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<unsigned long>(unsigned long)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned short>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<unsigned long>(unsigned long)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::string cv::ocl::kerToStr<unsigned short>(cv::Mat const&): error: undefined reference to 'std::ostream& std::ostream::_M_insert<unsigned long>(unsigned long)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::OpenCLBufferPoolBaseImpl<cv::ocl::OpenCLBufferPoolImpl, cv::ocl::CLBufferEntry, _cl_mem*>::setMaxReservedSize(unsigned int): error: undefined reference to 'std::__detail::_List_node_base::_M_unhook()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::OpenCLBufferPoolBaseImpl<cv::ocl::OpenCLBufferPoolImpl, cv::ocl::CLBufferEntry, _cl_mem*>::setMaxReservedSize(unsigned int): error: undefined reference to 'std::__detail::_List_node_base::_M_unhook()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::OpenCLBufferPoolBaseImpl<cv::ocl::OpenCLBufferPoolImpl, cv::ocl::CLBufferEntry, _cl_mem*>::release(_cl_mem*): error: undefined reference to 'std::__detail::_List_node_base::_M_unhook()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::OpenCLBufferPoolBaseImpl<cv::ocl::OpenCLBufferPoolImpl, cv::ocl::CLBufferEntry, _cl_mem*>::release(_cl_mem*): error: undefined reference to 'std::__detail::_List_node_base::_M_hook(std::__detail::_List_node_base*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::OpenCLBufferPoolBaseImpl<cv::ocl::OpenCLBufferPoolImpl, cv::ocl::CLBufferEntry, _cl_mem*>::release(_cl_mem*): error: undefined reference to 'std::__detail::_List_node_base::_M_unhook()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::kernelToStr(cv::_InputArray const&, int, char const*): error: undefined reference to 'std::string::_Rep::_M_dispose(std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Kernel::set(int, cv::ocl::Image2D const&): error: undefined reference to 'std::__detail::_List_node_base::_M_hook(std::__detail::_List_node_base*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<_cl_platform_id*, std::allocator<_cl_platform_id*> >::resize(unsigned int, _cl_platform_id*): error: undefined reference to 'std::__throw_length_error(char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::isExtensionSupported(cv::String const&) const: error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::imageFromBufferSupport() const: error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<std::string, std::allocator<std::string> >::_M_insert_aux(__gnu_cxx::__normal_iterator<std::string*, std::vector<std::string, std::allocator<std::string> > >, std::string const&): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<std::string, std::allocator<std::string> >::_M_insert_aux(__gnu_cxx::__normal_iterator<std::string*, std::vector<std::string, std::allocator<std::string> > >, std::string const&): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<std::string, std::allocator<std::string> >::_M_insert_aux(__gnu_cxx::__normal_iterator<std::string*, std::vector<std::string, std::allocator<std::string> > >, std::string const&): error: undefined reference to 'std::string::assign(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<std::string, std::allocator<std::string> >::_M_insert_aux(__gnu_cxx::__normal_iterator<std::string*, std::vector<std::string, std::allocator<std::string> > >, std::string const&): error: undefined reference to 'std::string::assign(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<std::string, std::allocator<std::string> >::_M_insert_aux(__gnu_cxx::__normal_iterator<std::string*, std::vector<std::string, std::allocator<std::string> > >, std::string const&): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<std::string, std::allocator<std::string> >::_M_insert_aux(__gnu_cxx::__normal_iterator<std::string*, std::vector<std::string, std::allocator<std::string> > >, std::string const&): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::ios_base::ios_base()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::basic_ios<char, std::char_traits<char> >::init(std::basic_streambuf<char, std::char_traits<char> >*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::locale::locale()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::_M_sync(char*, unsigned int, unsigned int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::basic_ios<char, std::char_traits<char> >::init(std::basic_streambuf<char, std::char_traits<char> >*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::basic_istream<char, std::char_traits<char> >& std::getline<char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, char)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'std::basic_istringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_istringstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'VTT for std::basic_istringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::split(std::string const&, char, std::vector<std::string, std::allocator<std::string> >&): error: undefined reference to 'vtable for std::basic_istringstream<char, std::char_traits<char>, std::allocator<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::OpenCLBufferPoolBaseImpl<cv::ocl::OpenCLBufferPoolImpl, cv::ocl::CLBufferEntry, _cl_mem*>::_findAndRemoveEntryFromReservedList(cv::ocl::CLBufferEntry&, unsigned int): error: undefined reference to 'std::__detail::_List_node_base::_M_hook(std::__detail::_List_node_base*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::_Rb_tree<std::string, std::string, std::_Identity<std::string>, std::less<std::string>, std::allocator<std::string> >::_M_insert_(std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, std::string const&): error: undefined reference to 'std::_Rb_tree_insert_and_rebalance(bool, std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, std::_Rb_tree_node_base&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::Impl::Impl(void*): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::Impl::Impl(void*): error: undefined reference to 'std::string::assign(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::Impl::Impl(void*): error: undefined reference to 'std::string::find(char, unsigned int) const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::Impl::Impl(void*): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&, unsigned int, unsigned int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::Impl::Impl(void*): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::Impl::Impl(void*): error: undefined reference to 'std::_Rb_tree_decrement(std::_Rb_tree_node_base*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Device::Impl::Impl(void*): error: undefined reference to 'std::__throw_out_of_range(char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<_cl_platform_id*, std::allocator<_cl_platform_id*> >::_M_fill_insert(__gnu_cxx::__normal_iterator<_cl_platform_id**, std::vector<_cl_platform_id*, std::allocator<_cl_platform_id*> > >, unsigned int, _cl_platform_id* const&): error: undefined reference to 'std::__throw_length_error(char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function std::vector<_cl_device_id*, std::allocator<_cl_device_id*> >::_M_fill_insert(__gnu_cxx::__normal_iterator<_cl_device_id**, std::vector<_cl_device_id*, std::allocator<_cl_device_id*> > >, unsigned int, _cl_device_id* const&): error: undefined reference to 'std::__throw_length_error(char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::find(char const*, unsigned int, unsigned int) const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::_M_mutate(unsigned int, unsigned int, unsigned int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::assign(char const*, unsigned int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::_M_leak_hard()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::ostream::put(char)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::ostream::flush()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::_M_leak_hard()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::_M_leak_hard()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::_M_leak_hard()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::compare(char const*) const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::compare(char const*) const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::compare(char const*) const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::find(char const*, unsigned int, unsigned int) const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::_M_mutate(unsigned int, unsigned int, unsigned int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::assign(char const*, unsigned int)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::compare(char const*) const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::string::assign(std::string const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::ctype<char>::_M_widen_init() const'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::__throw_bad_cast()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::selectOpenCLDevice(): error: undefined reference to 'std::cerr'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::OpenCLBufferPoolImpl::_allocateBufferEntry(cv::ocl::CLBufferEntry&, unsigned int): error: undefined reference to 'std::__detail::_List_node_base::_M_hook(std::__detail::_List_node_base*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Context::Impl::unloadProg(cv::ocl::Program&): error: undefined reference to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int, std::allocator<char> const&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Context::Impl::unloadProg(cv::ocl::Program&): error: undefined reference to 'std::_Rb_tree_increment(std::_Rb_tree_node_base const*)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function cv::ocl::Context::Impl::unloadProg(cv::ocl::Program&): error: undefined reference to 'std::_Rb_tree_rebalance_for_erase(std::_Rb_tree_node_base*, std::_Rb_tree_node_base&)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function _GLOBAL__sub_I_ocl.cpp: error: undefined reference to 'std::ios_base::Init::Init()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(ocl.cpp.o):ocl.cpp:function _GLOBAL__sub_I_ocl.cpp: error: undefined reference to 'std::ios_base::Init::~Init()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*) [clone .part.8]: error: undefined reference to 'std::basic_ios<char, std::char_traits<char> >::clear(std::_Ios_Iostate)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::SyncTraceStorage::put(cv::utils::trace::details::TraceMessage const&) const: error: undefined reference to 'std::ostream::flush()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): error: undefined reference to 'std::basic_filebuf<char, std::char_traits<char> >::close()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): error: undefined reference to 'std::basic_filebuf<char, std::char_traits<char> >::close()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): error: undefined reference to 'std::__basic_file<char>::~__basic_file()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): error: undefined reference to 'std::basic_ios<char, std::char_traits<char> >::clear(std::_Ios_Iostate)'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): error: undefined reference to 'std::__basic_file<char>::~__basic_file()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): error: undefined reference to 'std::basic_ofstream<char, std::char_traits<char> >::~basic_ofstream()'
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): error: undefined reference to 'vtable for std::basic_ofstream<char, std::char_traits<char> >'
C:/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(trace.cpp.o):trace.cpp:function cv::utils::trace::details::AsyncTraceStorage::~AsyncTraceStorage(): er