Build command failed.
Error while executing process C:\Users\Public\cmake\3.6.4111459\bin\cmake.exe with arguments {--build C:\test\UseOpenCVwithCMake\app\.externalNativeBuild\cmake\debug\x86_64 --target native-lib}
[1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o
C:\test\UseOpenCVwithCMake\app\src\main\cpp\native-lib.cpp:77:52: warning: format specifies type 'int' but the argument has type 'std::__ndk1::vector<cv::Rect_<int>, std::__ndk1::allocator<cv::Rect_<int> > >::size_type' (aka 'unsigned long') [-Wformat]
(char *) "face %d found ", faces.size());
~~ ^~~~~~~~~~~~
%lu
1 warning generated.
[2/2] Linking CXX shared library ..\..\..\..\build\intermediates\cmake\debug\obj\x86_64\libnative-lib.so
FAILED: cmd.exe /C "cd . && C:\Users\Public\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=x86_64-none-linux-android --gcc-toolchain=C:/Users/Public/ndk-bundle/toolchains/x86_64-4.9/prebuilt/windows-x86_64 --sysroot=C:/Users/Public/ndk-bundle/sysroot -fPIC -isystem C:/Users/Public/ndk-bundle/sysroot/usr/include/x86_64-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -frtti -fexceptions -std=gnu++11 -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot C:/Users/Public/ndk-bundle/platforms/android-21/arch-x86_64 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -LC:/Users/Public/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86_64 -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\x86_64\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -llog -landroid ../../../../src/main/JniLibs/x86_64/libopencv_java3.so -latomic -lm "C:/Users/Public/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86_64/libc++_static.a" "C:/Users/Public/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86_64/libc++abi.a" && cd ."
C:\test\UseOpenCVwithCMake\app\src\main\cpp/native-lib.cpp:73: error: undefined reference to 'cv::CascadeClassifier::detectMultiScale(cv::_InputArray const&, std::__ndk1::vector<cv::Rect_<int>, std::__ndk1::allocator<cv::Rect_<int> > >&, double, int, int, cv::Size_<int>, cv::Size_<int>)'
C:\test\UseOpenCVwithCMake\app\src\main\cpp/native-lib.cpp:95: error: undefined reference to 'cv::CascadeClassifier::detectMultiScale(cv::_InputArray const&, std::__ndk1::vector<cv::Rect_<int>, std::__ndk1::allocator<cv::Rect_<int> > >&, double, int, int, cv::Size_<int>, cv::Size_<int>)'
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
