opencv_3.4.bb build failed when using PACKAGECONFIG python2 or python3

[zohanlin]

Dear all,

I use Yocto 4.9.88(rock 2.4) BSP and bitbake opencv without modifying any files, the mission is complete.

Now I want to use opencv called by python, so I add two PACKAGECONFIG  python2 & python3 in opencv_3.4.bb

and remove PACKAGECONFIG_remove_imx   = "eigen python3" in opencv_3.4.bbappend.

The build is failed this time.

The error message is as below

| [ 8%] Built target IlmImf
| make[1]: Leaving directory '/ACS_Disk2/MS5776/20191226/imx-yocto-bsp/imx-linux-rocko/MS5776_V107/tmp/work/cortexa9hf-neon-mx6qdl-poky-linux-gnueabi/opencv/3.4+gitAUTOINC+6d4f66472e_81ca8dab86_a62e20676a_34e4206aef_fccf7cd6a4-r0/build'
| Makefile:165: recipe for target 'all' failed
| make: *** [all] Error 2
| WARNING: exit code 2 from a shell command.
| ERROR: Function failed: do_compile (log file is located at /ACS_Disk2/MS5776/20191226/imx-yocto-bsp/imx-linux-rocko/MS5776_V107/tmp/work/cortexa9hf-neon-mx6qdl-poky-linux-gnueabi/opencv/3.4+gitAUTOINC+6d4f66472e_81ca8dab86_a62e20676a_34e4206aef_fccf7cd6a4-r0/temp/log.do_compile.7712)
ERROR: Task (/ACS_Disk2/MS5776/20191226/imx-yocto-bsp/imx-linux-rocko/sources/meta-fsl-bsp-release/imx/meta-bsp/recipes-graphics/opencv/opencv_3.4.bb:do_compile) failed with exit code '1' 

Could anyone tell me what happened? And how do I fix it?

updated in 2020/01/30

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I used "bitbake -D opencv" and found the error message :

make[2]: *** No rule to make target 'modules/dnn/attr_value.pb.cc', needed by 'modules/python_bindings_generator/pyopencv_generated_include.h' 

And I tried to follow the steps from No rule to make target 'modules/dnn/attr_value.pb.cc' · Issue #10474 · opencv/opencv · GitHub 

But I have not found a way to build opencv_dnn first in Yocto BSP yet. 

[gusarambula]

Hello zohan Lin,

Thank you for keeping this thread updated. Have you tried baking the OpenCV without modifications first?

Regards,

[zohanlin]

Hi Gusarambula,

I still used Yocto 4.9.88(rock 2.4) BSP and updated the OpenCV to v4.0.1(from imx-yocto-L4.14.98_2.3.0), then I enabled python3, OpenCL, dnn and text.

Finally, I built it successfully. 

But I tested the source code as below

import cv2
img = cv2.UMat(cv2.imread("image.jpg", cv2.IMREAD_COLOR))
imgUMat = cv2.UMat(img)
gray = cv2.cvtColor(imgUMat, cv2.COLOR_BGR2GRAY)
gray = cv2.GaussianBlur(gray, (7, 7), 1.5)
gray = cv2.Canny(gray, 0, 50)

cv2.imwrite('test.jpg',img)
cv2.imwrite('test_UMat.jpg' , imgUMat)

it reported an error from OpenCL

[ WARN:0] Using world accessible cache directory. This may be not secure: /var/tmp/
OpenCL error CL_INVALID_WORK_GROUP_SIZE (-54) during call: clEnqueueNDRangeKernel('row_filter_C1_D0', dims=2, globalsize=128x528x1, localsize=16x16x1) sync=false
[ 1] 25: FMA_MUL temp(322).dp.x, 2.000000, temp(319).dp.x

I also tested the code in OpenCV v3.4, it worked and no error.

Could you tell me what happened and how to fix it?

[gusarambula]

Hello Zohan Lin,

I'm glad to hear that you were able to build it on a newer BSP. (Some older BSPs are having problems especially with repositories having been moved).

However, I would need to ask you to please branch your question to a new thread (or open a new thread) as it's more related to the actual an OpenCV implementation and not building it in Yocto, and this will also give it more visibility.

Regards,

[zohanlin]

Hello gusarambula,

I have built OpenCV successfully without modifications.

Thanks,

zohan