[Cython] Shared Cython runtime (was: Upcoming cython/numpy breakage with stride checking)

[mark florisson]

On 9 April 2013 14:46, Nathaniel Smith <njs at pobox.com> wrote:

> On Tue, Apr 9, 2013 at 2:11 PM, Stefan Behnel <stefan_ml at behnel.de> wrote:
> > Nathaniel Smith, 09.04.2013 15:00:
> >> On 9 Apr 2013 13:50, "Stefan Behnel" wrote:
> >>> Nathaniel Smith, 09.04.2013 14:25:
> >>> There's also the problem of dependency hell and getting rid of old
> modules
> >>> once they are no longer used on the user side. And also, how to get
> them
> >>> there in the first place. Having one package overwrite the files of
> >>> another during its installation is just asking for trouble.
> >>
> >> The system I described does not involve the addition of any new files to
> >> any package.
> >
> > I take it then that you were envisaging a separate "cython-runtime"
> package
> > on PyPI that Cython compiled modules would have to depend on?
>
> No, I must have been unclear -- I envisage that each cython-compiled
> module continues to contain all the code it depends on (just like
> now). But, the first cython-compiled module that is imported tweaks
> sys.modules *as if* there were a separate cython-runtime package, and
> sticks the necessary pieces (like the memoryview TypeObject) into this
> module, and later modules import it from there.
>
> There's no additional dependencies anywhere. You have to be careful to
> make sure you version the runtime module appropriately so that you
> don't end up with a module compiled with cython version X using the
> runtime injected by a module compiled with the incompatible cython
> version Y, but this is no harder than any other versioning problem.
> Just make sure to change the runtime module name whenever you break
> compatibility.
>
> -n
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I'd actually really like it if I could compile a trivial module in under a
hundred lines of generated code :) I.e. allow both a cython header and a
seperately installable runtime, each of which is optional.
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