[Distutils] setup_requires and install_requires

[Daniel Holth]

The plan is that pip will cache builds automatically in the future.
Generally build  requirements should be kept separate from install
requirements.
On May 24, 2014 12:25 PM, "Toby St Clere Smithe" <mail at tsmithe.net> wrote:

> Daniel Holth <dholth at gmail.com> writes:
> > Just build a wheel first. Then numpy is installed twice but only built
> once.
>
> Sure -- but why isn't this automatic? This solution is a bit of a hack
> around what seems a needless inefficiency!
>
>
> Best,
>
> Toby
>
>
> > On May 24, 2014 12:16 PM, "Toby St Clere Smithe" <mail at tsmithe.net>
> wrote:
> >
> >> Hi Ralf,
> >>
> >> Ralf Gommers <ralf.gommers at gmail.com> writes:
> >> > I wasn't actually.
> >>
> >> Well, I'm glad I could be of service, I guess. Should I report this as a
> >> bug?
> >>
> >> >> but I wonder if there's any progress
> >> >> for me to be aware of. I've got an extension that I build with
> >> >> distutils. It requires numpy both to build and to run, so I have
> numpy
> >> >> in both setup_requires and install_requires. Yet setup.py builds
> numpy
> >> >> twice -- once for the build stage, and then again on installation.
> This
> >> >> seems inefficient to me -- why not just build it once? Is this by
> >> >> design?
> >> >>
> >> >
> >> > Seems fairly inefficient, so I'd guess it's not by design.
> >>
> >> Indeed.
> >>
> >> > Note that if numpy is already installed, you may want to avoid adding
> the
> >> > *_requires arguments in order not to silently upgrade or break the
> >> > installed numpy. Something like
> >> > https://github.com/scipy/scipy/pull/3566/files
> >>
> >> This is good advice, but what about the cases in which the build machine
> >> is not the installation machine? I already have a versioned dependency,
> >> which will on each possible machine (trivially) either be satisfied or
> >> not, and if it's not, then it should be.
> >>
> >> Cheers,
> >>
> >> Toby
> >>
> >>
> >> --
> >> Toby St Clere Smithe
> >> http://tsmithe.net
> >>
> >> _______________________________________________
> >> Distutils-SIG maillist  -  Distutils-SIG at python.org
> >> https://mail.python.org/mailman/listinfo/distutils-sig
> >>
> > _______________________________________________
> > Distutils-SIG maillist  -  Distutils-SIG at python.org
> > https://mail.python.org/mailman/listinfo/distutils-sig
>
> --
> Toby St Clere Smithe
> http://tsmithe.net
>
> _______________________________________________
> Distutils-SIG maillist  -  Distutils-SIG at python.org
> https://mail.python.org/mailman/listinfo/distutils-sig
>
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