[Buildroot] [PATCH v6 08/16] package/opencv: add python support

Yann E. MORIN yann.morin.1998 at free.fr
Fri Jun 26 17:51:07 UTC 2015 

Samuel, All,

On 2015-06-25 21:59 +0200, Samuel Martin spake thusly:
> opencv_python module needs python-numpy because it uses some numpy
> headers in this wrapper.
> 
> From its 2.4 release, OpenCV offers python bindings, but they required
> most of the OpenCV modules to be enabled.
> 
> Since OpenCV-3.0.0, python bindings have been reworked:
> - it now supports both python2 and python3
> - only built modules supporting wrapped in python will be included in
>   the bindings.

With Python2 enabled, I still see this in the configure log:

    --   Python 2:
    --     Interpreter:     /home/ymorin/dev/buildroot/O/host/usr/bin/python2 (ver 2.7.10)
    --     Libraries:       /home/ymorin/dev/buildroot/O/host/usr/i586-buildroot-linux-gnu/sysroot/usr/lib32/libpython2.7.so (ver 2.7.10)
    --     numpy:           /home/ymorin/dev/buildroot/O/host/usr/i586-buildroot-linux-gnu/sysroot/usr/lib/python2.7/site-packages/numpy/core/include
           (ver undefined - cannot be probed because of the cross-compilation)
    --     packages path:   /usr/lib/python2.7/site-packages
    --
    --   Python 3:
    --     Interpreter:     /usr/bin/python3.4 (ver 3.4)
    --

Should we force the configure step to find python3 as something like
/bin/false to avoid any potential issue, even if we already pass
-DBUILD_opencv_python3=OFF

(Similarly with python2 when python3 is enabled, of course.)

> Signed-off-by: Samuel Martin <s.martin49 at gmail.com>
> Reviewed-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>

(reviewed tag still valid)

Tested-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>

Build-tested only, for i586.

Regards,
Yann E. MORIN.

> ---
> changes v5->v6:
> - rebase
> 
> changes v4->v5:
> - rebase
> - update a/r/t tags
> - update commit log
> - fix python-numpy selection
> - add python3 support
> 
> changes v3->v4:
> - rebase
> - rename _OPT -> _OPTS
> - remove python/numpy patch (merged upstream since opencv bump)
> 
> changes v2->v3:
> - rebase
> - add fetch uri in the opencv's patch (Yann)
> - move pyhton module knob under the multi-line if block about python deps
>   (Yann)
> 
> changes v1->v2:
> - rebase
> - use patch merged upstream
> ---
>  package/opencv/Config.in | 12 +++++++++++-
>  package/opencv/opencv.mk | 33 +++++++++++++++++++++++++++++++--
>  2 files changed, 42 insertions(+), 3 deletions(-)
> 
> diff --git a/package/opencv/Config.in b/package/opencv/Config.in
> index 3c00525..8ed505e 100644
> --- a/package/opencv/Config.in
> +++ b/package/opencv/Config.in
> @@ -89,7 +89,17 @@ config BR2_PACKAGE_OPENCV_LIB_PHOTO
>  	  Include opencv_photo (computational photography) module into the OpenCV
>  	  build.
>  
> -comment "opencv_python module requires numpy which is not yet available."
> +config BR2_PACKAGE_OPENCV_LIB_PYTHON
> +	bool "python"
> +	depends on BR2_PACKAGE_PYTHON || BR2_PACKAGE_PYTHON3
> +	depends on BR2_aarch64 || BR2_arm || BR2_armeb || BR2_i386 \
> +		|| BR2_mips || BR2_mipsel || BR2_powerpc || BR2_powerpc64 \
> +		|| BR2_sh || BR2_x86_64 # python-numpy
> +	depends on !BR2_TOOLCHAIN_USES_UCLIBC || BR2_i386 || BR2_x86_64 # python-numpy
> +	select BR2_PACKAGE_PYTHON_NUMPY
> +	help
> +	  Include opencv_python module into the OpenCV build.
> +	  No python example is installed.
>  
>  config BR2_PACKAGE_OPENCV_LIB_SHAPE
>  	bool "shape"
> diff --git a/package/opencv/opencv.mk b/package/opencv/opencv.mk
> index 7211c18..a43de0c 100644
> --- a/package/opencv/opencv.mk
> +++ b/package/opencv/opencv.mk
> @@ -78,8 +78,6 @@ OPENCV_CONF_OPTS += \
>  	-DBUILD_opencv_ml=$(if $(BR2_PACKAGE_OPENCV_LIB_ML),ON,OFF) \
>  	-DBUILD_opencv_objdetect=$(if $(BR2_PACKAGE_OPENCV_LIB_OBJDETECT),ON,OFF) \
>  	-DBUILD_opencv_photo=$(if $(BR2_PACKAGE_OPENCV_LIB_PHOTO),ON,OFF) \
> -	-DBUILD_opencv_python2=OFF \
> -	-DBUILD_opencv_python3=OFF \
>  	-DBUILD_opencv_shape=$(if $(BR2_PACKAGE_OPENCV_LIB_SHAPE),ON,OFF) \
>  	-DBUILD_opencv_stitching=$(if $(BR2_PACKAGE_OPENCV_LIB_STITCHING),ON,OFF) \
>  	-DBUILD_opencv_superres=$(if $(BR2_PACKAGE_OPENCV_LIB_SUPERRES),ON,OFF) \
> @@ -282,6 +280,37 @@ else
>  OPENCV_CONF_OPTS += -DWITH_V4L=OFF -DWITH_LIBV4L=OFF
>  endif
>  
> +ifeq ($(BR2_PACKAGE_OPENCV_LIB_PYTHON),y)
> +ifeq ($(BR2_PACKAGE_PYTHON),y)
> +OPENCV_CONF_OPTS += \
> +	-DBUILD_opencv_python2=ON \
> +	-DBUILD_opencv_python3=OFF \
> +	-DPYTHON2_EXECUTABLE=$(HOST_DIR)/usr/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)
> +OPENCV_DEPENDENCIES += python
> +else
> +OPENCV_CONF_OPTS += \
> +	-DBUILD_opencv_python2=OFF \
> +	-DBUILD_opencv_python3=ON \
> +	-DPYTHON3_EXECUTABLE=$(HOST_DIR)/usr/bin/python3 \
> +	-DPYTHON3_INCLUDE_PATH=$(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)
> +OPENCV_DEPENDENCIES += python3
> +endif
> +OPENCV_DEPENDENCIES += python-numpy
> +else
> +OPENCV_CONF_OPTS += \
> +	-DBUILD_opencv_python2=OFF \
> +	-DBUILD_opencv_python3=OFF
> +endif
> +
>  # Installation hooks:
>  define OPENCV_CLEAN_INSTALL_DOC
>  	$(RM) -fr $(TARGET_DIR)/usr/share/OpenCV/doc
> -- 
> 2.4.4
> 
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