I am trying to create an application which combines `opencv` and `dlib` library for facial landmark detection.
I writing the code in the `android studio` natively. When I include the `dlib` library onto my native code in `android studio` I get the following error when I try to build the program. Can some one please help.
Error:FAILURE: Build failed with an exception.
* What went wrong: Execution failed for task ':mobile:externalNativeBuildDebug'.
> Build command failed. Error while executing '/opt/android-sdk-linux/cmake/3.6.3155560/bin/cmake' with arguments {--build mobile/.externalNativeBuild/cmake/debug/arm64-v8a
--target native-lib} [1/1] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/arm64-v8a/libnative-lib.so FAILED: : && /opt/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++
-target aarch64-none-linux-android -gcc-toolchain /opt/android-sdk-linux/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64
--sysroot=/opt/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm64
-fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -std=c++11 -frtti -fexceptions -v -Wall -Werror -std=c++11 -frtti -fexceptions -v -Wall -Werror -I/usr/local/include -std=gnu++11 -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -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/arm64-v8a/libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o /opt/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm64/usr/lib/liblog.so ../../../../src/main/jniLibs/arm64-v8a/libopencv_java3.so ../../../../src/main/jniLibs/arm64-v8a/libdlib-lib.so
-lm "/opt/android-sdk-linux/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/libgnustl_static.a" && : Android clang version
3.8.256229 (based on LLVM 3.8.256229) Target: aarch64-none-linux-android Thread model: posix InstalledDir: /opt/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin Found candidate GCC installation: /opt/android-sdk-linux/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x Selected GCC installation: /opt/android-sdk-linux/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x Candidate multilib: .;@m64 Selected multilib: .;@m64 "/opt/android-sdk-linux/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld"
--sysroot=/opt/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm64
--eh-frame-hdr -m aarch64linux -shared -o ../../../../build/intermediates/cmake/debug/obj/arm64-v8a/libnative-lib.so /opt/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm64/usr/lib/crtbegin_so.o
-L/opt/android-sdk-linux/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x
-L/opt/android-sdk-linux/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/lib/../lib64
-L/opt/android-sdk-linux/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/lib
-L/opt/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm64/usr/lib
--build-id --warn-shared-textrel --fatal-warnings --no-undefined -z noexecstack -z relro -z now --build-id
--warn-shared-textrel --fatal-warnings --no-undefined -z noexecstack -z relro -z now -soname libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o /opt/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm64/usr/lib/liblog.so ../../../../src/main/jniLibs/arm64-v8a/libopencv_java3.so ../../../../src/main/jniLibs/arm64-v8a/libdlib-lib.so
-lm /opt/android-sdk-linux/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/libgnustl_static.a
-lstdc++ -lm -lgcc -ldl -lc -lgcc -ldl /opt/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm64/usr/lib/crtend_so.o CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o: In function `dlib_check_consistent_assert_usage': /mobile/.externalNativeBuild/cmake/debug/arm64-v8a/../../../../generateLibs/jni/dlib/dlib/threads/threads_kernel_shared.h:44: undefined reference to `USER_ERROR__missing_dlib_all_source_cpp_file__OR__inconsistent_use_of_DEBUG_or_ENABLE_ASSERTS_preprocessor_directives_' /mobile/.externalNativeBuild/cmake/debug/arm64-v8a/../../../../generateLibs/jni/dlib/dlib/threads/threads_kernel_shared.h:44: undefined reference to `USER_ERROR__missing_dlib_all_source_cpp_file__OR__inconsistent_use_of_DEBUG_or_ENABLE_ASSERTS_preprocessor_directives_' clang++: error: linker command failed with exit code 1 (use -v to see invocation) ninja: build stopped: subcommand failed.
* Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
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