[bug#33764] [PATCH] gnu: z3: Update to 4.8.3 and add python{, 2}-z3 bindings.

[Efraim Flashner <efraim@flashner.co.il>]

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On Sun, Dec 16, 2018 at 04:18:16PM +0100, Ludovic Courtès wrote:
> Hello Amin,
> 
> Amin Bandali <bandali@gnu.org> skribis:
> 
> > * gnu/packages/maths.scm (z3): Update to 4.8.3.
> > [build-system]: Switch from cmake to make, and use the current
> > scripts/mk_make.py build script instead of the now-deprecated
> > contrib/cmake/bootstrap.py.
> >
> > * gnu/packages/python.scm (python-z3, python2-z3): New public
> > variables.
> 
> Overall LGTM.  Some comments:
> 
> >      (native-inputs
> > -     `(("python" ,python-2)))
> > +     `(("which" ,(@ (gnu packages base) which))
> > +       ("python" ,python-wrapper)))
> 
> Please add #:use-module (gnu packages which) so you don’t have to resort
> to the @ notation.
> 
> > --- a/gnu/packages/python.scm
> > +++ b/gnu/packages/python.scm
> > @@ -56,6 +56,7 @@
> >  ;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
> >  ;;; Copyright © 2018 Maxim Cournoyer <maxim.cournoyer@gmail.com>
> >  ;;; Copyright © 2018 Luther Thompson <lutheroto@gmail.com>
> > +;;; Copyright © 2018 Amin Bandali <bandali@gnu.org>
> >  ;;;
> >  ;;; This file is part of GNU Guix.
> >  ;;;
> > @@ -14989,3 +14990,12 @@ RFC 8265 and RFC 8266.")
> >      (description "Simple decorator to set attributes of target function or
> >  class in a @acronym{DRY, Don't Repeat Yourself} way.")
> >      (license license:expat)))
> > +
> > +(define-public python-z3 z3)
> 
> Is this variable necessary?  Note that this does not create a
> “python-z3” package.
> 
> > +(define-public python2-z3
> > +  (package (inherit python-z3)
> 
> This definition cannot be in python.scm; it must be in the same file as
> ‘z3’ or we can get “unbound variable” errors while loading either of
> these two modules.
> 
> Also, as we’re approaching end-of-life upstream for Python 2.x, we now
> avoid creating “python2-” packages, unless we cannot avoid it for some
> reason.  Do you think we could do without this “python2-z3” package?
> 

Currently our z3 package builds python2 bindings

> Could you send an updated patch?  If you think we really need
> “python2-z3”, please make it a separate patch.
> 
> Thank you!
> 
> Ludo’.
> 

We should also check that the other packages that use z3 aren't
expecting the python2 bindings when built with the python3 bindings.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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