Re: cython 3.x (for Python 3.12)

[Julian Gilbey <julian@d-and-j.net>]

On Mon, Dec 11, 2023 at 08:09:31AM +0100, Matthias Klose wrote:
> [...]
> > > > I find that there's also a significant issue with relying on
> > > > cython3-legacy: it conflicts with cython3, meaning that it will be
> > > > impossible to simultaneously install packages depending on cython3 and
> > > > cython3-legacy.  Once cython 3.x moves from experimental to unstable
> > > > to testing and packages start depending on it, this will become a
> > > > significant issue.  I assume that the aim will be for everything to be
> > > > ported to cython 3.x and for cython3-legacy to be dropped from testing
> > > > before the trixie freeze?
> [...]
> You could package a non-conflicting cython-legacy, however that would
> require more changes, also how to build it.

I had a very quick look at the packaged cython3-legacy.  One could
change the name of the module to Cython_legacy or probably better,
Cython0, and cython.py to cython0.py, pyximport to pyximport0.  Just a
handful of changes would be needed, I'm guessing.  Then it would be
co-installable with Cython 3.x, and any packages that actually need
cython3-legacy rather than Cython 3.x would have to be patched to call
the legacy version.  It's probably easier to just patch them for
Cython 3.x ;-)

Best wishes,

   Julian