Can't reproduce with NDK18b. Please compare logs with ours (make VERBOSE=1).

-DBUILD_PREF_TESTS

typo in PERF

@alalek
thanks, i tried with NDK18b, it's success.

but even failed withandroid-ndk-r19c or android-ndk-r20

log:

[ 57%] Linking CXX shared library ../../lib/armeabi-v7a/libopencv_core.so
cd /home/andforce/Downloads/opencv-4.1.1/build/modules/core && /usr/bin/cmake -E cmake_link_script CMakeFiles/opencv_core.dir/link.txt --verbose=1
/home/andforce/Downloads/android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=armv7-none-linux-androideabi16 --gcc-toolchain=/home/andforce/Downloads/android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64 --sysroot=/home/andforce/Downloads/android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mfpu=vfpv3-d16 -fno-addrsig -march=armv7-a -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -stdlib=libc++ -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -Oz -DNDEBUG -DNDEBUG -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--exclude-libs,libunwind.a -Wl,--no-undefined -Qunused-arguments -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -Wl,--gc-sections -shared -Wl,-soname,libopencv_core.so -o ../../lib/armeabi-v7a/libopencv_core.so CMakeFiles/opencv_core.dir/src/algorithm.cpp.o CMakeFiles/opencv_core.dir/src/alloc.cpp.o CMakeFiles/opencv_core.dir/src/arithm.cpp.o CMakeFiles/opencv_core.dir/src/arithm.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/array.cpp.o CMakeFiles/opencv_core.dir/src/async.cpp.o CMakeFiles/opencv_core.dir/src/batch_distance.cpp.o CMakeFiles/opencv_core.dir/src/bindings_utils.cpp.o CMakeFiles/opencv_core.dir/src/channels.cpp.o CMakeFiles/opencv_core.dir/src/check.cpp.o CMakeFiles/opencv_core.dir/src/command_line_parser.cpp.o CMakeFiles/opencv_core.dir/src/conjugate_gradient.cpp.o CMakeFiles/opencv_core.dir/src/convert.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/convert_c.cpp.o CMakeFiles/opencv_core.dir/src/convert_scale.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/copy.cpp.o CMakeFiles/opencv_core.dir/src/count_non_zero.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/cuda_gpu_mat.cpp.o CMakeFiles/opencv_core.dir/src/cuda_host_mem.cpp.o CMakeFiles/opencv_core.dir/src/cuda_info.cpp.o CMakeFiles/opencv_core.dir/src/cuda_stream.cpp.o CMakeFiles/opencv_core.dir/src/datastructs.cpp.o CMakeFiles/opencv_core.dir/src/directx.cpp.o CMakeFiles/opencv_core.dir/src/downhill_simplex.cpp.o CMakeFiles/opencv_core.dir/src/dxt.cpp.o CMakeFiles/opencv_core.dir/src/gl_core_3_1.cpp.o CMakeFiles/opencv_core.dir/src/glob.cpp.o CMakeFiles/opencv_core.dir/src/hal_internal.cpp.o CMakeFiles/opencv_core.dir/src/kmeans.cpp.o CMakeFiles/opencv_core.dir/src/lapack.cpp.o CMakeFiles/opencv_core.dir/src/lda.cpp.o CMakeFiles/opencv_core.dir/src/logger.cpp.o CMakeFiles/opencv_core.dir/src/lpsolver.cpp.o CMakeFiles/opencv_core.dir/src/lut.cpp.o CMakeFiles/opencv_core.dir/src/mathfuncs.cpp.o CMakeFiles/opencv_core.dir/src/mathfuncs_core.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/matmul.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/matrix.cpp.o CMakeFiles/opencv_core.dir/src/matrix_c.cpp.o CMakeFiles/opencv_core.dir/src/matrix_decomp.cpp.o CMakeFiles/opencv_core.dir/src/matrix_expressions.cpp.o CMakeFiles/opencv_core.dir/src/matrix_iterator.cpp.o CMakeFiles/opencv_core.dir/src/matrix_operations.cpp.o CMakeFiles/opencv_core.dir/src/matrix_sparse.cpp.o CMakeFiles/opencv_core.dir/src/matrix_wrap.cpp.o CMakeFiles/opencv_core.dir/src/mean.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/merge.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/minmax.cpp.o CMakeFiles/opencv_core.dir/src/norm.cpp.o CMakeFiles/opencv_core.dir/src/ocl.cpp.o CMakeFiles/opencv_core.dir/src/opencl/runtime/opencl_clamdblas.cpp.o CMakeFiles/opencv_core.dir/src/opencl/runtime/opencl_clamdfft.cpp.o CMakeFiles/opencv_core.dir/src/opencl/runtime/opencl_core.cpp.o CMakeFiles/opencv_core.dir/src/opengl.cpp.o CMakeFiles/opencv_core.dir/src/out.cpp.o CMakeFiles/opencv_core.dir/src/ovx.cpp.o CMakeFiles/opencv_core.dir/src/parallel.cpp.o CMakeFiles/opencv_core.dir/src/parallel_impl.cpp.o CMakeFiles/opencv_core.dir/src/pca.cpp.o CMakeFiles/opencv_core.dir/src/persistence.cpp.o CMakeFiles/opencv_core.dir/src/persistence_json.cpp.o CMakeFiles/opencv_core.dir/src/persistence_types.cpp.o CMakeFiles/opencv_core.dir/src/persistence_xml.cpp.o CMakeFiles/opencv_core.dir/src/persistence_yml.cpp.o CMakeFiles/opencv_core.dir/src/rand.cpp.o CMakeFiles/opencv_core.dir/src/softfloat.cpp.o CMakeFiles/opencv_core.dir/src/split.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/stat.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/stat_c.cpp.o CMakeFiles/opencv_core.dir/src/stl.cpp.o CMakeFiles/opencv_core.dir/src/sum.dispatch.cpp.o CMakeFiles/opencv_core.dir/src/system.cpp.o CMakeFiles/opencv_core.dir/src/tables.cpp.o CMakeFiles/opencv_core.dir/src/trace.cpp.o CMakeFiles/opencv_core.dir/src/types.cpp.o CMakeFiles/opencv_core.dir/src/umatrix.cpp.o CMakeFiles/opencv_core.dir/src/utils/datafile.cpp.o CMakeFiles/opencv_core.dir/src/utils/filesystem.cpp.o CMakeFiles/opencv_core.dir/src/utils/logtagconfigparser.cpp.o CMakeFiles/opencv_core.dir/src/utils/logtagmanager.cpp.o CMakeFiles/opencv_core.dir/src/utils/samples.cpp.o CMakeFiles/opencv_core.dir/src/va_intel.cpp.o CMakeFiles/opencv_core.dir/opencl_kernels_core.cpp.o -ldl -lm -llog ../../3rdparty/lib/armeabi-v7a/libtegra_hal.a /home/andforce/Downloads/android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/arm-linux-androideabi/libz.a ../../3rdparty/lib/armeabi-v7a/libcpufeatures.a ../../3rdparty/lib/armeabi-v7a/libittnotify.a ../../3rdparty/lib/armeabi-v7a/libtegra_hal.a -ldl -latomic -lm
bionic/libc/include/bits/fortify/stdio.h:70: error: undefined reference to '__vsnprintf_chk'
bionic/libc/include/bits/fortify/stdio.h:43: error: undefined reference to '__vsnprintf_chk'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
modules/core/CMakeFiles/opencv_core.dir/build.make:1345: recipe for target 'lib/armeabi-v7a/libopencv_core.so' failed
make[2]: *** [lib/armeabi-v7a/libopencv_core.so] Error 1
make[2]: Leaving directory '/home/andforce/Downloads/opencv-4.1.1/build'
CMakeFiles/Makefile2:1509: recipe for target 'modules/core/CMakeFiles/opencv_core.dir/all' failed
make[1]: *** [modules/core/CMakeFiles/opencv_core.dir/all] Error 2
make[1]: Leaving directory '/home/andforce/Downloads/opencv-4.1.1/build'
Makefile:162: recipe for target 'all' failed
make: *** [all] Error 2

android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/arm-linux-androideabi/libz.a

Seems related: android/ndk#1069

Try to force zlib from OpenCV: cmake -DBUILD_ZLIB=ON ...

android-ndk-r19c/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/arm-linux-androideabi/libz.a

Seems related: android/ndk#1069

Try to force zlib from OpenCV: cmake -DBUILD_ZLIB=ON ...

@alalek
thans very munch~

i compile success when add -DBUILD_ZLIB=ON compile with android-ndk-r19c AND android-ndk-r20

the complete cmake command is:

cmake .. -DINSTALL_ANDROID_EXAMPLES=OFF \
-DANDROID_EXAMPLES_WITH_LIBS=OFF \
-DBUILD_EXAMPLES=OFF \
-DBUILD_DOCS=OFF \
-DWITH_OPENCL=OFF \
-DWITH_IPP=ON \
-DCMAKE_TOOLCHAIN_FILE=${ANDROID_NDK_HOME}/build/cmake/android.toolchain.cmake \
-DANDROID_TOOLCHAIN=clang \
-DANDROID_STL=c++_shared \
-DBUILD_SHARED_LIBS=ON \
-DBUILD_ANDROID_PROJECTS=OFF \
-DBUILD_ANDROID_EXAMPLES=OFF \
-DBUILD_PREF_TESTS=OFF \
-DBUILD_TESTS=OFF \
-DANDROID_ABI=armeabi-v7a \
-DANDROID_SDK_TARGET=21 \
-DBUILD_ZLIB=ON          # for NDK 19 & 20 compile error