[Distutils] PEP for dependencies on libraries like BLAS (was: Re: Working toward Linux wheel support)

[James Polley]

It looks like we've had a numbering collision

https://github.com/pypa/interoperability-peps/pull/30/files is the PEP
Tennessee is working on

On Thu, Aug 13, 2015 at 10:56 AM Nathaniel Smith <njs at pobox.com> wrote:

> On Aug 12, 2015 16:49, "Robert Collins" <robertc at robertcollins.net> wrote:
> >
> > I'm not sure what will be needed to get the PR accepted; At PyCon AU
> > Tennessee Leuwenberg started drafting a PEP for the expression of
> > dependencies on e.g. BLAS - its been given number 497, and is in the
> > packaging-peps repo; I'm working on updating it now.
>
> I wanted to take a look at this PEP, but I can't seem to find it. PEP 497:
>   https://www.python.org/dev/peps/pep-0497/
> appears to be something else entirely?
>
> I'm a bit surprised to hear that such a PEP is needed. We (= numpy devs)
> have actively been making plans to ship a BLAS wheel on windows, and AFAICT
> this is totally doable now -- the blocker is windows toolchain issues, not
> pypa-related infrastructure.
>
> Specifically the idea is to have a wheel that contains the shared library
> as a regular old data file, plus a stub python package that knows how to
> find this data file and how to make it accessible to the linker. So
> numpy/__init__.py would start by calling:
>
> import pyopenblas1
> # on Linux modifies LD_LIBRARY_PATH,
> # on Windows uses ctypes to preload... whatever
> pyopenblas1.enable()
>
> and then get on with things, or the build system might do:
>
> import pyopenblas1
> pyopenblas1.get_header_directories()
> pyopenblas1.get_linker_directories()
>
> This doesn't help if you want to declare dependencies on external, system
> managed libraries and have those be automatically somehow provided or
> checked for, but to me that sounds like an impossible boil-the-ocean
> project anyway, while the above is trivial and should just work.
>
> -n
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