OpenCV static library in Yocto

OpenCV is built either as a shared object or a static library, not both. Yocto recipe in the meta-oe builds the library as shared objects, which is a sensible default for sure.

As a note to future self, one way to build a subset of OpenCV as a static library instead is to add the following in e.g. conf/local.conf

PACKAGECONFIG:pn-opencv = " gstreamer"

EXTRA_OECMAKE:append:pn-opencv = " \

                               -DBUILD_SHARED_LIBS=OFF \

                               -DENABLE_PIC=ON \

                               -DWITH_PROTOBUF=OFF \

                               -DBUILD_PROTOBUF=OFF \

                               -DBUILD_opencv_python2=OFF \

                               -DBUILD_opencv_python3=OFF \

                               -DBUILD_JAVA=OFF \

                               "


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