Bug#972566: python3-opencv: build python extensions for all supported python versions

[Mo Zhou]

Hi Drew,

Thanks for the report. python3-opencv is built using cmake. I have no
idea on the way of enabling multiple python3 builds for the current
cmake build system.

On Tue, Oct 20, 2020 at 07:40:44PM +0800, Drew Parsons wrote:
> Package: python3-opencv
> Version: 4.2.0+dfsg-6+b4
> Severity: normal
> 
> Currently python3-opencv only builds python extensions
> (/usr/lib/python3/dist-packages/cv2.cpython-38-x86_64-linux-gnu.so)
> for the default version of python (python3.8 at the moment).
> 
> It would be nice if the extension module could be built for all
> supported pythons (python3.9 is now in the archive).
> 
> Currently opencv Build-Depends: python3-dev, hence only builds against
> the default python.
> 
> Will the other python versions be built automatically if that is updated to
>  Build-Depends: python3-all-dev   ?
> 
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