请教一个动态链接库构建的问题 (c++) (android) (opencv)

各位大佬

正在开发一个安卓 app，用到 jni，在 c++ 里调用 opencv 。但是 opencv 始终不能连接成功，链接时错误日志（截几行）如下：

/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `String':
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/jni/include/opencv2/core/cvstd.hpp:602: undefined reference to `cv::String::allocate(unsigned long)'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `Java_com_turingvideo_robot_jni_NativeHelper_drawText':
/Users/rqs/proj/android_robot/src/main/jni/native_jni.cpp:150: undefined reference to `cv::putText(cv::_InputOutputArray const&, cv::String const&, cv::Point_<int>, int, double, cv::Scalar_<double>, int, int, bool)'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `~String':
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/jni/include/opencv2/core/cvstd.hpp:648: undefined reference to `cv::String::deallocate()'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `String':
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/jni/include/opencv2/core/cvstd.hpp:602: undefined reference to `cv::String::allocate(unsigned long)'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `Java_com_turingvideo_robot_jni_NativeHelper_drawText':
/Users/rqs/proj/android_robot/src/main/jni/native_jni.cpp:151: undefined reference to `cv::putText(cv::_InputOutputArray const&, cv::String const&, cv::Point_<int>, int, double, cv::Scalar_<double>, int, int, bool)'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `~String':
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/jni/include/opencv2/core/cvstd.hpp:648: undefined reference to `cv::String::deallocate()'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `String':
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/jni/include/opencv2/core/cvstd.hpp:602: undefined reference to `cv::String::allocate(unsigned long)'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `Java_com_turingvideo_robot_jni_NativeHelper_drawText':
/Users/rqs/proj/android_robot/src/main/jni/native_jni.cpp:153: undefined reference to `cv::putText(cv::_InputOutputArray const&, cv::String const&, cv::Point_<int>, int, double, cv::Scalar_<double>, int, int, bool)'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `~String':
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/jni/include/opencv2/core/cvstd.hpp:648: undefined reference to `cv::String::deallocate()'
/Users/rqs/proj/android_robot/build/intermediates/ndkBuild/release/obj/local/arm64-v8a/objs/native-lib/native_jni.o: In function `String':
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/jni/include/opencv2/core/cvstd.hpp:602: undefined reference to `cv::String::allocate(unsigned long)'

我理解 undefined reference 就是链接时找不到某个符号的实现，一般是因为某个库的缺失、某个库的版本不对，类型不匹配。

我找到了构建工具执行的链接语句，也比较长：


/Users/rqs/Library/Android/sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++\
        -Wl,-soname,libnative-lib.so\
        -shared\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/objs-debug/native-lib/native_jni.o\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/objs-debug/native-lib/src/arucotag.o\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/objs-debug/native-lib/src/utils.o\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/objs-debug/native-lib/src/occupancy_grid.o\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/objs-debug/native-lib/src/occupancy_grid_jni.o\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/objs-debug/native-lib/src/virtual_wall_grid_jni.o\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/objs-debug/native-lib/src/virtual_wall_grid.o\
        /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_aruco.a\
        /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_highgui.a\
        /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_calib3d.a\
        /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_imgproc.a\
        /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/3rdparty/libs/arm64-v8a/libcpufeatures.a\
        /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/3rdparty/libs/arm64-v8a/libtegra_hal.a\
        /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_core.a\
        -lgcc\
        -Wl,--exclude-libs,libgcc.a\
        -Wl,--exclude-libs,libgcc_real.a\
        -latomic\
        -Wl,--exclude-libs,libatomic.a\
        /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/libc++_shared.so\
        -target\
        aarch64-none-linux-android21\
        -no-canonical-prefixes\
        -Wl,--build-id\
        -ljnigraphics\
        -nostdlib++\
        -Wl,--no-undefined\
        -Wl,--fatal-warnings\
        -llog -ldl -lz -lm -lc -lm\
        -o /Users/rqs/proj/android_robot/build/intermediates/ndkBuild/debug/obj/local/arm64-v8a/libnative-lib.so

拿错误里提到的cv::String::deallocate() 来说，我在我指定的 libopencv_core 这个静态库中能够找到这个实现，nm 显示如下：


[19:44:57] rqs:opencv_prebuilt git:(1e0923e*) $ nm -CA /Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_core.a | grep deallocate | grep ' T '
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_core.a:matrix.cpp.o: 0000000000000000 T cv::Mat::deallocate()
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_core.a:stl.cpp.o: 0000000000000000 T cv::String::deallocate()
/Users/rqs/proj/android_robot/opencv_prebuilt/sdk/native/staticlibs/arm64-v8a/libopencv_core.a:umatrix.cpp.o: 0000000000000000 T cv::UMat::deallocate()

可见里面有代码段的全局的 cv::String::deallocate，它是一个不接受参数的函数，所以不会因为参数类型不匹配导致整体不匹配。

既然提供了这个静态链接库，库里面也有它的实现，为什么还是会有链接错误呢？请指教，谢谢！