Upcoming Qt switch to OpenGL ES on arm64

[Dmitry Shachnev]

On Fri, Nov 23, 2018 at 12:25:51PM +0100, Julien Cristau wrote:
> > According to config_help.txt [1], Qt uses ES2 by default on Windows.
> > It probably means that it will work fine with most desktop video cards.
> >
> > But as Lisandro says, such a change in Debian will break many packages
> > (which are currently broken on ARM only), so we are definitely not
> > considering it at this point.
>
> Why is it OK to break them on arm64 if it's not OK to break them on
> amd64?  Do you have a list of those packages?

The majority of arm64 devices are mobile/embedded, which cannot be said
about amd64.

Of course it is bad to break packages, but leaving arm64 users with
non-working Qt graphics is also not ideal. So we are trying to find a
compromise solution here.

We do not have a final list yet, but packages that may get broken will
likely belong to one of these two groups:

- Packages that build-depend on both qtbase5-dev and libglu1-mesa-dev:

  cgal, flightgear, fraqtive, kalgebra, kstars, ksudoku, kubrick, paraview,
  simplescreenrecorder, starpu, starpu-contrib, structure-synth, vtk6, vtk7

- Packages that build-depend on libqt5opengl5-desktop-dev:

  bino, deepin-movie-reborn, enki-aseba, fracplanet, fraqtive, freecad,
  krita, libconfig-model-dpkg-perl, mldemos, mm3d, openms, qwtplot3d,
  shelxle, soundscaperenderer, tetzle, virtualjaguar, vite, vtk7

This is not a final list yet, but should be enough to get an estimate.

--
Dmitry Shachnev
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