Hello all, I've implemented the wheel side of Nick's suggestion from very early in this thread to support a vendor-providable binary-compatibility.cfg.
https://bitbucket.org/pypa/wheel/pull-request/54/ If this is acceptable, I'll add support for it to the pip side. What else should be implemented at this stage to get the PR accepted? Thanks, --nate On Tue, Jul 28, 2015 at 12:21 PM, Wes Turner <wes.tur...@gmail.com> wrote: > > On Jul 28, 2015 10:02 AM, "Oscar Benjamin" <oscar.j.benja...@gmail.com> > wrote: > > > > On Fri, 24 Jul 2015 at 19:53 Chris Barker <chris.bar...@noaa.gov> wrote: > >> > >> On Tue, Jul 21, 2015 at 9:38 AM, Oscar Benjamin < > oscar.j.benja...@gmail.com> wrote: > >>> > >>> > >>> I think it would be great to just package these up as wheels and put > them on PyPI. > >> > >> > >> that's the point -- there is no way with the current spec to specify a > wheel dependency as opposed to a package dependency. i.e this particular > binary numpy wheel depends on this other wheel, whereas the numpy source > pacakge does not have that dependency -- and, indeed, a wheel for one > platform may have different dependencies that\n other platforms. > > > > > > I thought it was possible to do this with wheels. It's already possible > to have wheels or sdists whose dependencies vary by platform I thought. > > > > The BLAS dependency is different. In particular the sdist is compatible > with more cases than a wheel would be so the built wheel would have a more > precise requirement than the sdist. Is that not possible with > pip/wheels/PyPI or is that a limitation of using setuptools to build the > wheel? > > > >>> > >>> So numpy could depend on "blas" and there could be a few different > distributions on PyPI that provide "blas" representing the different > underlying libraries. If I want to install numpy with a particular one I > can just do: > >>> > >>> pip install gotoblas # Installs the BLAS library within Python > dirs > >>> pip install numpy > >> > >> > >> well,different implementations of BLAS are theoretically ABI > compatible, but as I understand it, it's not actually that simple, so this > is particularly challenging. > >> > >> > >> But if it were, this would be a particular trick, because then that > numpy wheel would depend on _some_ BLAS wheel, but there may be more than > one option -- how would you express that???? > > > > > > I imagined having numpy Require "blas OR openblas". Then openblas > package Provides "blas". Any other BLAS library also provides "blas". If > you do "pip install numpy" and "blas" is already provided then the numpy > wheel installs fine. Otherwise it falls back to installing openblas. > > > > Potentially "blas" is not specific enough so the label could be > "blas-gfortran" to express the ABI. > > BLAS may not be the best example, but should we expect such linked > interfaces to change over time? (And e.g. be versioned dependencies with > shim packages that have check functions)? > > ... How is an ABI constraint different from a package dependency? > > iiuc, ABI tags are thus combinatorial with package/wheel dependency > strings? > > Conda/pycosat solve this with "preprocessing selectors" : > http://conda.pydata.org/docs/building/meta-yaml.html#preprocessing-selectors > : > > ``` > linux True if the platform is Linux > linux32 True if the platform is Linux and the Python architecture is 32-bit > linux64 True if the platform is Linux and the Python architecture is 64-bit > armv6 True if the platform is Linux and the Python architecture is armv6l > osx True if the platform is OS X > unix True if the platform is Unix (OS X or Linux) > win True if the platform is Windows > win32 True if the platform is Windows and the Python architecture is 32-bit > win64 True if the platform is Windows and the Python architecture is 64-bit > py The Python version as a two digit string (like '27'). See also the > CONDA_PY environment variable below. > py3k True if the Python major version is 3 > py2k True if the Python major version is 2 > py26 True if the Python version is 2.6 > py27 True if the Python version is 2.7 > py33 True if the Python version is 3.3 > py34 True if the Python version is 3.4 > np The NumPy version as a two digit string (like '17'). See also the > CONDA_NPY environment variable below. > Because the selector is any valid Python expression, complicated logic is > possible. > ``` > > > > > -- > > Oscar > > > > _______________________________________________ > > Distutils-SIG maillist - Distutils-SIG@python.org > > https://mail.python.org/mailman/listinfo/distutils-sig > > > > _______________________________________________ > Distutils-SIG maillist - Distutils-SIG@python.org > https://mail.python.org/mailman/listinfo/distutils-sig > >
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