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kumquat-buildroot/package/opencv3/opencv3.mk
Sasha Shyrokov 8ba80282c3 opencv3: fix Python module build for Python 3.x 
When the OpenCV3 Python support is enabled with Python 3.x, it builds
properly, and the resulting .so file is built for the target
architecture, but its name is wrong:

  output/target/usr/lib/python3.6/site-packages/cv2.cpython-36m-x86_64-linux-gnu.so

This prevents Python 3.x from importing the module:

>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'cv2'

In order to fix this, we simply need to pass PKG_PYTHON_DISTUTILS_ENV
in the environment. The Python module then gets named:

  output/target/usr/lib/python3.6/site-packages/cv2.cpython-36m-arm-linux-gnueabi.so

And can be imported properly:

>>> import cv2
>>>

This solution was suggested by Arnout Vandecappelle in
https://stackoverflow.com/questions/49059035/buildroot-opencv3-python-package-builds-for-the-wrong-target.

With Python 2.x, the module is named just cv2.so so this problem isn't
visible. However, for consistency, we also pass
PKG_PYTHON_DISTUTILS_ENV when building against Python 2.x, by putting
the OPENCV3_CONF_ENV assignment inside the
BR2_PACKAGE_OPENCV3_LIB_PYTHON condition, but outside the
BR2_PACKAGE_PYTHON3/BR2_PACKAGE_PYTHON condition.

Signed-off-by: Sasha Shyrokov <alexander-shyrokov@idexx.com>
[Thomas: extend the commit log, apply the solution to Python 2.x.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2018-04-01 10:46:16 +02:00

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################################################################################
#
# opencv3
#
################################################################################
OPENCV3_VERSION = 3.3.0
OPENCV3_SITE = $(call github,opencv,opencv,$(OPENCV3_VERSION))
OPENCV3_INSTALL_STAGING = YES
OPENCV3_LICENSE = BSD-3-Clause
OPENCV3_LICENSE_FILES = LICENSE
OPENCV3_SUPPORTS_IN_SOURCE_BUILD = NO
# Uses __atomic_fetch_add_4
ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
OPENCV3_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
endif
# OpenCV component options
OPENCV3_CONF_OPTS += \
-DBUILD_DOCS=OFF \
-DBUILD_PERF_TESTS=$(if $(BR2_PACKAGE_OPENCV3_BUILD_PERF_TESTS),ON,OFF) \
-DBUILD_TESTS=$(if $(BR2_PACKAGE_OPENCV3_BUILD_TESTS),ON,OFF) \
-DBUILD_WITH_DEBUG_INFO=OFF \
-DDOWNLOAD_EXTERNAL_TEST_DATA=OFF
ifeq ($(BR2_PACKAGE_OPENCV3_BUILD_TESTS)$(BR2_PACKAGE_OPENCV3_BUILD_PERF_TESTS),)
OPENCV3_CONF_OPTS += -DINSTALL_TEST=OFF
else
OPENCV3_CONF_OPTS += -DINSTALL_TEST=ON
endif
# OpenCV build options
OPENCV3_CONF_OPTS += \
-DBUILD_WITH_STATIC_CRT=OFF \
-DENABLE_COVERAGE=OFF \
-DENABLE_FAST_MATH=ON \
-DENABLE_IMPL_COLLECTION=OFF \
-DENABLE_NOISY_WARNINGS=OFF \
-DENABLE_OMIT_FRAME_POINTER=ON \
-DENABLE_PRECOMPILED_HEADERS=OFF \
-DENABLE_PROFILING=OFF \
-DOPENCV3_WARNINGS_ARE_ERRORS=OFF
# OpenCV link options
OPENCV3_CONF_OPTS += \
-DCMAKE_INSTALL_RPATH_USE_LINK_PATH=OFF \
-DCMAKE_SKIP_RPATH=OFF \
-DCMAKE_USE_RELATIVE_PATHS=OFF
# OpenCV packaging options:
OPENCV3_CONF_OPTS += \
-DBUILD_PACKAGE=OFF \
-DENABLE_SOLUTION_FOLDERS=OFF \
-DINSTALL_CREATE_DISTRIB=OFF
# OpenCV module selection
# * Modules on:
# - core: if not set, opencv does not build anything
# - hal: core's dependency
# * Modules off:
# - android*: android stuff
# - apps: programs for training classifiers
# - java: java bindings
# - viz: missing VTK dependency
# - world: all-in-one module
#
# * Contrib modules from [1] are disabled:
# - opencv_contrib package is not available in Buildroot;
# - OPENCV3_EXTRA_MODULES_PATH is not set.
#
# [1] https://github.com/Itseez/opencv_contrib
OPENCV3_CONF_OPTS += \
-DBUILD_opencv_androidcamera=OFF \
-DBUILD_opencv_apps=OFF \
-DBUILD_opencv_calib3d=$(if $(BR2_PACKAGE_OPENCV3_LIB_CALIB3D),ON,OFF) \
-DBUILD_opencv_core=ON \
-DBUILD_opencv_features2d=$(if $(BR2_PACKAGE_OPENCV3_LIB_FEATURES2D),ON,OFF) \
-DBUILD_opencv_flann=$(if $(BR2_PACKAGE_OPENCV3_LIB_FLANN),ON,OFF) \
-DBUILD_opencv_highgui=$(if $(BR2_PACKAGE_OPENCV3_LIB_HIGHGUI),ON,OFF) \
-DBUILD_opencv_imgcodecs=$(if $(BR2_PACKAGE_OPENCV3_LIB_IMGCODECS),ON,OFF) \
-DBUILD_opencv_imgproc=$(if $(BR2_PACKAGE_OPENCV3_LIB_IMGPROC),ON,OFF) \
-DBUILD_opencv_java=OFF \
-DBUILD_opencv_ml=$(if $(BR2_PACKAGE_OPENCV3_LIB_ML),ON,OFF) \
-DBUILD_opencv_objdetect=$(if $(BR2_PACKAGE_OPENCV3_LIB_OBJDETECT),ON,OFF) \
-DBUILD_opencv_photo=$(if $(BR2_PACKAGE_OPENCV3_LIB_PHOTO),ON,OFF) \
-DBUILD_opencv_shape=$(if $(BR2_PACKAGE_OPENCV3_LIB_SHAPE),ON,OFF) \
-DBUILD_opencv_stitching=$(if $(BR2_PACKAGE_OPENCV3_LIB_STITCHING),ON,OFF) \
-DBUILD_opencv_superres=$(if $(BR2_PACKAGE_OPENCV3_LIB_SUPERRES),ON,OFF) \
-DBUILD_opencv_ts=$(if $(BR2_PACKAGE_OPENCV3_LIB_TS),ON,OFF) \
-DBUILD_opencv_video=$(if $(BR2_PACKAGE_OPENCV3_LIB_VIDEO),ON,OFF) \
-DBUILD_opencv_videoio=$(if $(BR2_PACKAGE_OPENCV3_LIB_VIDEOIO),ON,OFF) \
-DBUILD_opencv_videostab=$(if $(BR2_PACKAGE_OPENCV3_LIB_VIDEOSTAB),ON,OFF) \
-DBUILD_opencv_viz=OFF \
-DBUILD_opencv_world=OFF
# Hardware support options.
#
# * PowerPC support is turned off since its only effect is altering CFLAGS,
# adding '-mcpu=G3 -mtune=G5' to them, which is already handled by Buildroot.
OPENCV3_CONF_OPTS += \
-DENABLE_POWERPC=OFF
# Cuda stuff
OPENCV3_CONF_OPTS += \
-DBUILD_CUDA_STUBS=OFF \
-DBUILD_opencv_cudaarithm=OFF \
-DBUILD_opencv_cudabgsegm=OFF \
-DBUILD_opencv_cudacodec=OFF \
-DBUILD_opencv_cudafeatures2d=OFF \
-DBUILD_opencv_cudafilters=OFF \
-DBUILD_opencv_cudaimgproc=OFF \
-DBUILD_opencv_cudalegacy=OFF \
-DBUILD_opencv_cudaobjdetect=OFF \
-DBUILD_opencv_cudaoptflow=OFF \
-DBUILD_opencv_cudastereo=OFF \
-DBUILD_opencv_cudawarping=OFF \
-DBUILD_opencv_cudev=OFF \
-DWITH_CUBLAS=OFF \
-DWITH_CUDA=OFF \
-DWITH_CUFFT=OFF
# NVidia stuff
OPENCV3_CONF_OPTS += -DWITH_NVCUVID=OFF
# AMD stuff
OPENCV3_CONF_OPTS += \
-DWITH_OPENCLAMDBLAS=OFF \
-DWITH_OPENCLAMDFFT=OFF
# Intel stuff
OPENCV3_CONF_OPTS += \
-DBUILD_WITH_DYNAMIC_IPP=OFF \
-DWITH_INTELPERC=OFF \
-DWITH_IPP=OFF \
-DWITH_IPP_A=OFF \
-DWITH_TBB=OFF
# Smartek stuff
OPENCV3_CONF_OPTS += -DWITH_GIGEAPI=OFF
# Prosilica stuff
OPENCV3_CONF_OPTS += -DWITH_PVAPI=OFF
# Ximea stuff
OPENCV3_CONF_OPTS += -DWITH_XIMEA=OFF
# Non-Linux support (Android options) must remain OFF:
OPENCV3_CONF_OPTS += \
-DANDROID=OFF \
-DBUILD_ANDROID_CAMERA_WRAPPER=OFF \
-DBUILD_ANDROID_EXAMPLES=OFF \
-DBUILD_ANDROID_SERVICE=OFF \
-DBUILD_FAT_JAVA_LIB=OFF \
-DINSTALL_ANDROID_EXAMPLES=OFF \
-DWITH_ANDROID_CAMERA=OFF
# Non-Linux support (Mac OSX options) must remain OFF:
OPENCV3_CONF_OPTS += \
-DWITH_AVFOUNDATION=OFF \
-DWITH_CARBON=OFF \
-DWITH_QUICKTIME=OFF
# Non-Linux support (Windows options) must remain OFF:
OPENCV3_CONF_OPTS += \
-DWITH_CSTRIPES=OFF \
-DWITH_DSHOW=OFF \
-DWITH_MSMF=OFF \
-DWITH_VFW=OFF \
-DWITH_VIDEOINPUT=OFF \
-DWITH_WIN32UI=OFF
# Software/3rd-party support options:
# - disable all examples
OPENCV3_CONF_OPTS += \
-DBUILD_EXAMPLES=OFF \
-DBUILD_JASPER=OFF \
-DBUILD_JPEG=OFF \
-DBUILD_OPENEXR=OFF \
-DBUILD_PNG=OFF \
-DBUILD_TIFF=OFF \
-DBUILD_ZLIB=OFF \
-DINSTALL_C_EXAMPLES=OFF \
-DINSTALL_PYTHON_EXAMPLES=OFF \
-DINSTALL_TO_MANGLED_PATHS=OFF
# Disabled features (mostly because they are not available in Buildroot), but
# - eigen: OpenCV does not use it, not take any benefit from it.
OPENCV3_CONF_OPTS += \
-DWITH_1394=OFF \
-DWITH_CLP=OFF \
-DWITH_EIGEN=OFF \
-DWITH_GDAL=OFF \
-DWITH_GPHOTO2=OFF \
-DWITH_LAPACK=OFF \
-DWITH_MATLAB=OFF \
-DWITH_OPENCL=OFF \
-DWITH_OPENCL_SVM=OFF \
-DWITH_OPENEXR=OFF \
-DWITH_OPENNI2=OFF \
-DWITH_OPENNI=OFF \
-DWITH_UNICAP=OFF \
-DWITH_VA=OFF \
-DWITH_VA_INTEL=OFF \
-DWITH_VTK=OFF \
-DWITH_WEBP=OFF \
-DWITH_XINE=OFF
OPENCV3_DEPENDENCIES += zlib
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_FFMPEG),y)
OPENCV3_CONF_OPTS += -DWITH_FFMPEG=ON
OPENCV3_DEPENDENCIES += ffmpeg bzip2
else
OPENCV3_CONF_OPTS += -DWITH_FFMPEG=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_GSTREAMER),y)
OPENCV3_CONF_OPTS += -DWITH_GSTREAMER_0_10=ON
OPENCV3_DEPENDENCIES += gstreamer gst-plugins-base
else
OPENCV3_CONF_OPTS += -DWITH_GSTREAMER_0_10=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_GSTREAMER1),y)
OPENCV3_CONF_OPTS += -DWITH_GSTREAMER=ON
OPENCV3_DEPENDENCIES += gstreamer1 gst1-plugins-base
else
OPENCV3_CONF_OPTS += -DWITH_GSTREAMER=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_GTK)$(BR2_PACKAGE_OPENCV3_WITH_GTK3),)
OPENCV3_CONF_OPTS += -DWITH_GTK=OFF -DWITH_GTK_2_X=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_GTK),y)
OPENCV3_CONF_OPTS += -DWITH_GTK=ON -DWITH_GTK_2_X=ON
OPENCV3_DEPENDENCIES += libgtk2
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_GTK3),y)
OPENCV3_CONF_OPTS += -DWITH_GTK=ON -DWITH_GTK_2_X=OFF
OPENCV3_DEPENDENCIES += libgtk3
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_JASPER),y)
OPENCV3_CONF_OPTS += -DWITH_JASPER=ON
OPENCV3_DEPENDENCIES += jasper
else
OPENCV3_CONF_OPTS += -DWITH_JASPER=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_JPEG),y)
OPENCV3_CONF_OPTS += -DWITH_JPEG=ON
OPENCV3_DEPENDENCIES += jpeg
else
OPENCV3_CONF_OPTS += -DWITH_JPEG=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_OPENGL),y)
OPENCV3_CONF_OPTS += -DWITH_OPENGL=ON
OPENCV3_DEPENDENCIES += libgl
else
OPENCV3_CONF_OPTS += -DWITH_OPENGL=OFF
endif
OPENCV3_CONF_OPTS += -DWITH_OPENMP=$(if $(BR2_GCC_ENABLE_OPENMP),ON,OFF)
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_PNG),y)
OPENCV3_CONF_OPTS += -DWITH_PNG=ON
OPENCV3_DEPENDENCIES += libpng
else
OPENCV3_CONF_OPTS += -DWITH_PNG=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_QT)$(BR2_PACKAGE_OPENCV3_WITH_QT5),)
OPENCV3_CONF_OPTS += -DWITH_QT=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_QT),y)
OPENCV3_CONF_OPTS += -DWITH_QT=4
OPENCV3_DEPENDENCIES += qt
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_QT5),y)
OPENCV3_CONF_OPTS += -DWITH_QT=5
OPENCV3_DEPENDENCIES += qt5base
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_TIFF),y)
OPENCV3_CONF_OPTS += -DWITH_TIFF=ON
OPENCV3_DEPENDENCIES += tiff
else
OPENCV3_CONF_OPTS += -DWITH_TIFF=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_WITH_V4L),y)
OPENCV3_CONF_OPTS += \
-DWITH_LIBV4L=$(if $(BR2_PACKAGE_LIBV4L),ON,OFF) \
-DWITH_V4L=ON
OPENCV3_DEPENDENCIES += $(if $(BR2_PACKAGE_LIBV4L),libv4l)
else
OPENCV3_CONF_OPTS += -DWITH_V4L=OFF -DWITH_LIBV4L=OFF
endif
ifeq ($(BR2_PACKAGE_OPENCV3_LIB_PYTHON),y)
ifeq ($(BR2_PACKAGE_PYTHON),y)
OPENCV3_CONF_OPTS += \
-DBUILD_opencv_python2=ON \
-DBUILD_opencv_python3=OFF \
-DPYTHON2_EXECUTABLE=$(HOST_DIR)/bin/python2 \
-DPYTHON2_INCLUDE_PATH=$(STAGING_DIR)/usr/include/python$(PYTHON_VERSION_MAJOR) \
-DPYTHON2_LIBRARIES=$(STAGING_DIR)/usr/lib/libpython$(PYTHON_VERSION_MAJOR).so \
-DPYTHON2_NUMPY_INCLUDE_DIRS=$(STAGING_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)/site-packages/numpy/core/include \
-DPYTHON2_PACKAGES_PATH=/usr/lib/python$(PYTHON_VERSION_MAJOR)/site-packages \
-DPYTHON2_NUMPY_VERSION=$(PYTHON_NUMPY_VERSION)
OPENCV3_DEPENDENCIES += python
else
OPENCV3_CONF_OPTS += \
-DBUILD_opencv_python2=OFF \
-DBUILD_opencv_python3=ON \
-DPYTHON3_EXECUTABLE=$(HOST_DIR)/bin/python3 \
-DPYTHON3_INCLUDE_PATH=$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MAJOR)m \
-DPYTHON3_LIBRARIES=$(STAGING_DIR)/usr/lib/libpython$(PYTHON3_VERSION_MAJOR)m.so \
-DPYTHON3_NUMPY_INCLUDE_DIRS=$(STAGING_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages/numpy/core/include \
-DPYTHON3_PACKAGES_PATH=/usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages \
-DPYTHON3_NUMPY_VERSION=$(PYTHON_NUMPY_VERSION)
OPENCV3_DEPENDENCIES += python3
endif
OPENCV3_CONF_ENV += $(PKG_PYTHON_DISTUTILS_ENV)
OPENCV3_DEPENDENCIES += python-numpy
else
OPENCV3_CONF_OPTS += \
-DBUILD_opencv_python2=OFF \
-DBUILD_opencv_python3=OFF
endif
# Installation hooks:
define OPENCV3_CLEAN_INSTALL_DOC
$(RM) -fr $(TARGET_DIR)/usr/share/OpenCV/doc
endef
OPENCV3_POST_INSTALL_TARGET_HOOKS += OPENCV3_CLEAN_INSTALL_DOC
define OPENCV3_CLEAN_INSTALL_CMAKE
$(RM) -f $(TARGET_DIR)/usr/share/OpenCV/OpenCVConfig*.cmake
endef
OPENCV3_POST_INSTALL_TARGET_HOOKS += OPENCV3_CLEAN_INSTALL_CMAKE
ifneq ($(BR2_PACKAGE_OPENCV3_INSTALL_DATA),y)
define OPENCV3_CLEAN_INSTALL_DATA
$(RM) -fr $(TARGET_DIR)/usr/share/OpenCV/haarcascades \
$(TARGET_DIR)/usr/share/OpenCV/lbpcascades
endef
OPENCV3_POST_INSTALL_TARGET_HOOKS += OPENCV3_CLEAN_INSTALL_DATA
endif
$(eval $(cmake-package))
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