[Distutils] setup_requires and install_requires

[Daniel Holth]

Just build a wheel first. Then numpy is installed twice but only built once.
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
>
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