* [Buildroot] [git commit] opencv3: fix Python module build for Python 3.x
@ 2018-04-01 8:46 Thomas Petazzoni
2018-04-11 15:47 ` Peter Korsgaard
0 siblings, 1 reply; 2+ messages in thread
From: Thomas Petazzoni @ 2018-04-01 8:46 UTC (permalink / raw)
To: buildroot
commit: https://git.buildroot.net/buildroot/commit/?id=8ba80282c3bb580c6a45ea114e70acac98fe1690
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master
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>
---
package/opencv3/opencv3.mk | 1 +
1 file changed, 1 insertion(+)
diff --git a/package/opencv3/opencv3.mk b/package/opencv3/opencv3.mk
index cffe66b892..15e4eadfe3 100644
--- a/package/opencv3/opencv3.mk
+++ b/package/opencv3/opencv3.mk
@@ -327,6 +327,7 @@ OPENCV3_CONF_OPTS += \
-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 += \
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [Buildroot] [git commit] opencv3: fix Python module build for Python 3.x
2018-04-01 8:46 [Buildroot] [git commit] opencv3: fix Python module build for Python 3.x Thomas Petazzoni
@ 2018-04-11 15:47 ` Peter Korsgaard
0 siblings, 0 replies; 2+ messages in thread
From: Peter Korsgaard @ 2018-04-11 15:47 UTC (permalink / raw)
To: buildroot
>>>>> "Thomas" == Thomas Petazzoni <thomas.petazzoni@bootlin.com> writes:
> commit: https://git.buildroot.net/buildroot/commit/?id=8ba80282c3bb580c6a45ea114e70acac98fe1690
> branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master
> 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>
Committed to 2017.02.x, thanks.
--
Bye, Peter Korsgaard
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2018-04-11 15:47 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-04-01 8:46 [Buildroot] [git commit] opencv3: fix Python module build for Python 3.x Thomas Petazzoni
2018-04-11 15:47 ` Peter Korsgaard
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.