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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>
(cherry picked from commit 8ba80282c3)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches