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Hello I try to build OpenCv on my Raspberry Pi 3 with Ubuntu 16.04. But when I try to build it with Arm Neon enabled My cmake Command is this one:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_WITH_DEBUG_INFO=OFF -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_opencv_ts=OFF -D BUILD_PERF_TESTS=OFF -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=OFF -D OPENCV_EXTRA_MODULES_PATH=/home/flexpi/opencv_contrib/modules -DBUILD_opencv_python=OFF -D ENABLE_VFPV3=ON -DENABLE_NEON=ON -D WITH_LIBV4L=ON -D WITH_TBB=ON ..

I get this Error.

9%] Building CXX object 3rdparty/carotene/hal/carotene/CMakeFiles/carotene_objs.dir/src/fast.cpp.o

[ 9%] Building CXX object 3rdparty/carotene/hal/carotene/CMakeFiles/carotene_objs.dir/src/channels_combine.cpp.o

[ 11%] Built target carotene_objs

Scanning dependencies of target tegra_hal

[ 12%] Linking CXX static library ../../lib/libtegra_hal.a

[ 12%] Built target tegra_hal

[ 12%] Building CXX object modules/core/CMakeFiles/opencv_core_pch_dephelp.dir/opencv_core_pch_dephelp.cxx.o

In file included from /home/flexpi/opencv/modules/core/include/opencv2/core/cvdef.h:222:0,

             from /home/flexpi/opencv/modules/core/include/opencv2/core.hpp:52,

             from /home/flexpi/opencv/modules/core/include/opencv2/core/utility.hpp:56,

             from /home/flexpi/opencv/modules/core/src/precomp.hpp:49,

             from /home/flexpi/opencv/build/modules/core/opencv_core_pch_dephelp.cxx:1:

/home/flexpi/opencv/modules/core/include/opencv2/core/hal/intrin_neon.hpp:288:21: error: expected unqualified-id before ‘__extension__’

static inline short vget_lane_f16(float16x4_t a, int b)

                 ^

/home/flexpi/opencv/modules/core/include/opencv2/core/hal/intrin_neon.hpp:288:21: error: expected unqualified-id before ‘)’ token

static inline short vget_lane_f16(float16x4_t a, int b)

                 ^

modules/core/CMakeFiles/opencv_core_pch_dephelp.dir/build.make:71: recipe for target 'modules/core/CMakeFiles/opencv_core_pch_dephelp.dir/opencv_core_pch_dephelp.cxx.o' failed

make[2]: * [modules/core/CMakeFiles/opencv_core_pch_dephelp.dir/opencv_core_pch_dephelp.cxx.o] Error 1

CMakeFiles/Makefile2:1912: recipe for target 'modules/core/CMakeFiles/opencv_core_pch_dephelp.dir/all' failed

make[1]: * [modules/core/CMakeFiles/opencv_core_pch_dephelp.dir/all] Error 2

Makefile:160: recipe for target 'all' failed

make: * [all] Error 2

The Cmake Output is:

-- The CXX compiler identification is GNU 5.4.0

-- The C compiler identification is GNU 5.4.0

-- Check for working CXX compiler: /usr/bin/g++

-- Check for working CXX compiler: /usr/bin/g++ -- works

-- Detecting CXX compiler ABI info

-- Detecting CXX compiler ABI info - done

-- Detecting CXX compile features

-- Detecting CXX compile features - done

-- Check for working C compiler: /usr/bin/cc

-- Check for working C compiler: /usr/bin/cc -- works

-- Detecting C compiler ABI info

-- Detecting C compiler ABI info - done

-- Detecting C compile features

-- Detecting C compile features - done

-- Detected version of GNU GCC: 54 (504)

-- Performing Test HAVE_CXX_FSIGNED_CHAR

-- Performing Test HAVE_CXX_FSIGNED_CHAR - Success

-- Performing Test HAVE_C_FSIGNED_CHAR

-- Performing Test HAVE_C_FSIGNED_CHAR - Success

-- Performing Test HAVE_CXX_W

-- Performing Test HAVE_CXX_W - Success

-- Performing Test HAVE_C_W

-- Performing Test HAVE_C_W - Success

-- Performing Test HAVE_CXX_WALL

-- Performing Test HAVE_CXX_WALL - Success

-- Performing Test HAVE_C_WALL

-- Performing Test HAVE_C_WALL - Success

-- Performing Test HAVE_CXX_WERROR_RETURN_TYPE

-- Performing Test HAVE_CXX_WERROR_RETURN_TYPE - Success

-- Performing Test HAVE_C_WERROR_RETURN_TYPE

-- Performing Test HAVE_C_WERROR_RETURN_TYPE - Success

-- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR

-- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR - Success

-- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR

-- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR - Success ...