build.sh

#!/bin/bash -e

OPENCV_VERSION=4.8.0
PYTHON_VERSION=$(/build/venv/bin/cross-python -c 'import sys; print("%d.%d" % sys.version_info[:2])')
COMPILER=arm-frc2024-linux-gnueabi

pushd `dirname $0`
ROOT=`pwd`
popd

BUILD=`pwd`/build
CMAKE_TOOLCHAIN_FILE=$(pwd)/toolchain.cmake
CVDIR="$ROOT"/opencv-${OPENCV_VERSION}


function assert_path {
  if [ ! $1 "$2" ]; then
    echo "$2 does not exist, exiting"
    exit 1
  fi
}

sed -i "s/arm-linux-gnueabi/$COMPILER/g" "$CVDIR"/platforms/linux/arm-gnueabi.toolchain.cmake

[ -d build ] || mkdir build
pushd build

PYTHON3_INCLUDE_PATH=/build/crosspy/include/python${PYTHON_VERSION}
PYTHON3_SITE_PACKAGES=/build/venv/cross/lib/python${PYTHON_VERSION}/site-packages/
PYTHON3_NUMPY_INCLUDE_DIRS="$PYTHON3_SITE_PACKAGES"/numpy/_core/include

# Tried to compile with OpenBLAS support but cmake is weird..
#
# OPENBLAS_INCLUDE_DIR=/build/venv/cross/include
# OPENBLAS_LIB_DIR=/build/venv/cross/lib
#   -DWITH_LAPACK=ON \
#   -DLAPACK_INCLUDE_DIR=${OPENBLAS_INCLUDE_DIR} \
#   -DLAPACK_LINK_LIBRARIES=${OPENBLAS_LIB_DIR} \
#   -DLAPACK_CBLAS_H=cblas.h \
#   -DLAPACK_LAPACKE_H=lapacke.h \
#   -DLAPACK_LIBRARIES=openblas \
#   -DLAPACK_IMPL=OpenBLAS \

/build/venv/bin/cross-python -m pip --disable-pip-version-check install --prefer-binary numpy

assert_path -d "$PYTHON3_INCLUDE_PATH"
#assert_path -f "$PYTHON3_LIBRARY"
assert_path -d "$PYTHON3_NUMPY_INCLUDE_DIRS"

CMAKE_PREFIX_PATH=/build/venv/cross cmake \
  -DCMAKE_TOOLCHAIN_FILE="${CMAKE_TOOLCHAIN_FILE}" \
  -DOPENCV_VCSVERSION=${OPENCV_VERSION} \
  -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_INSTALL_PREFIX=/usr/local \
  -DWITH_CUDA=OFF \
  -DWITH_IPP=OFF \
  -DWITH_ITT=OFF \
  -DWITH_OPENCL=NO \
  -DWITH_FFMPEG=OFF \
  -DWITH_OPENEXR=OFF \
  -DWITH_GSTREAMER=OFF \
  -DWITH_GTK=OFF \
  -DWITH_1394=OFF \
  -DWITH_JASPER=OFF \
  -DWITH_TIFF=OFF \
  -DWITH_WEBP=OFF \
  -DWITH_PROTOBUF=OFF \
  \
  -DBUILD_JPEG=ON -DBUILD_PNG=ON -DBUILD_ZLIB=ON \
  \
  -DOPENCV_GENERATE_PKGCONFIG=ON \
  -DENABLE_NEON=ON -DENABLE_VFPV3=ON -DSOFTFP=ON \
  \
  -DBUILD_opencv_apps=OFF \
  -DBUILD_DOCS=OFF -DBUILD_EXAMPLES=OFF -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF \
  \
  -DOPENCV_SKIP_PYTHON_LOADER=ON \
  -DOPENCV_PYTHON3_INSTALL_PATH=lib/python${PYTHON_VERSION}/site-packages \
  -DBUILD_opencv_python2=OFF \
  -DBUILD_opencv_python3=ON \
  "-DPYTHON3_INCLUDE_PATH=${PYTHON3_INCLUDE_PATH}" \
  "-DPYTHON3_INCLUDE_DIR=${PYTHON3_INCLUDE_PATH}" \
  "-DPYTHON3_INCLUDE_DIR2=${PYTHON3_INCLUDE_PATH}" \
  "-DPYTHON3_NUMPY_INCLUDE_DIRS=${PYTHON3_NUMPY_INCLUDE_DIRS}" \
  "$CVDIR"

if which nproc; then
  MAKEARGS="-j `nproc`"
fi

make $MAKEARGS

cpack -G TGZ
mv OpenCV-${OPENCV_VERSION}-arm.tar.gz ${ROOT}/OpenCV-${OPENCV_VERSION}-arm.tar.gz
popd