Android 安卓NDK制造。数以百计的；未定义的参考错误“；s

当尝试构建这个示例项目时，我得到了成百上千的

错误：未定义的引用。以下是输出的前几行：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:externalNativeBuildDebug'.
> Build command failed.
  Error while executing process /home/aidan/Android/Sdk/cmake/3.6.4111459/bin/cmake with arguments {--build /home/aidan/AndroidStudioProjects/AICamera/app/.externalNativeBuild/cmake/debug/armeabi-v7a --target native-lib}
  [1/1] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/libnative-lib.so
  FAILED: : && /home/aidan/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  --target=armv7-none-linux-androideabi --gcc-toolchain=/home/aidan/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 --sysroot=/home/aidan/Android/Sdk/ndk-bundle/sysroot -fPIC -isystem /home/aidan/Android/Sdk/ndk-bundle/sysroot/usr/include/arm-linux-androideabi -D__ANDROID_API__=22 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -frtti -fexceptions -std=c++11 -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot /home/aidan/Android/Sdk/ndk-bundle/platforms/android-22/arch-arm -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--fix-cortex-a8 -Wl,--exclude-libs,libunwind.a -L/home/aidan/Android/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  -Wl,--whole-archive ../../../../src/main/jniLibs/armeabi-v7a/libCaffe2_CPU.a -Wl,--no-whole-archive ../../../../src/main/jniLibs/armeabi-v7a/libCAFFE2_NNPACK.a ../../../../src/main/jniLibs/armeabi-v7a/libCAFFE2_PTHREADPOOL.a ../../../../src/main/jniLibs/armeabi-v7a/libglog.so ../../../../src/main/jniLibs/armeabi-v7a/libprotobuf.a libcpufeatures.a /home/aidan/Android/Sdk/ndk-bundle/platforms/android-22/arch-arm/usr/lib/liblog.so /home/aidan/Android/Sdk/ndk-bundle/platforms/android-22/arch-arm/usr/lib/libandroid.so -ldl -latomic -lm "/home/aidan/Android/Sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libc++_static.a" "/home/aidan/Android/Sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libc++abi.a" "/home/aidan/Android/Sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libunwind.a" "-ldl" && :
  ../../../../src/main/jniLibs/armeabi-v7a/libCaffe2_CPU.a(nnpack_ops.cc.o):nnpack_ops.cc:function std::_Sp_counted_deleter<void*, void (*)(void*), std::allocator<void>, (__gnu_cxx::_Lock_policy)2>::_M_get_deleter(std::type_info const&): error: undefined reference to 'std::type_info::operator==(std::type_info const&) const'
  ../../../../src/main/jniLibs/armeabi-v7a/libCaffe2_CPU.a(nnpack_ops.cc.o):nnpack_ops.cc:function std::_Sp_counted_deleter<void*, caffe2::Tensor<caffe2::CPUContext>::raw_mutable_data(caffe2::TypeMeta const&)::{lambda(void*)#1}, std::allocator<void>, (__gnu_cxx::_Lock_policy)2>::_M_get_deleter(std::type_info const&): error: undefined reference to 'std::type_info::operator==(std::type_info const&) const'
  ../../../../src/main/jniLibs/armeabi-v7a/libCaffe2_CPU.a(nnpack_ops.cc.o):nnpack_ops.cc:function void caffe2::TypeMeta::_CopyNotAllowed<caffe2::Tensor<caffe2::CPUContext> >(void const*, void*, unsigned int): 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)'
... + 100s of similar lines, all with undefined references

caffe2/AICamera本机库是为libgnustl\u shared.so（请参阅）预先构建的，但是您的项目使用libc++\u static.a。您应该指定

externalNativeBuild {
    cmake {
        arguments "-DANDROID_STL=gnustl_shared"
    }
}

在您的build.gradle中，或者重建libCaffe2\u库。
您是否尝试将相关的.SO文件放入libs文件夹？我有相关的
.a
文件，例如错误消息中的
src/main/jniLibs/armeabi-v7a/libCaffe2\u CPU.a
。不知这是否与链接器标志或使用错误的STL有关？我相信您需要
包含库的源代码路径。您可以使用
target\u include\u directories（）
来执行此操作。还需要添加
packagingOptions{pickFirst'lib/armeabi-v7a/libgnustl\u shared.so'}
externalNativeBuild {
    cmake {
        arguments "-DANDROID_STL=gnustl_shared"
    }
}