[Distutils] PEP 517 again

Nick Coghlan ncoghlan at gmail.com
Thu Aug 31 00:56:00 EDT 2017

On 31 August 2017 at 14:22, xoviat <xoviat at gmail.com> wrote:
> This appears to be related to https://github.com/pypa/pip/pull/3225, where
> pip would generate overbroad wheel names in the cache. So to proceed on this
> issue, setuptools will assume that generated wheels are valid for the
> specific python implementation only (eg. wheels generated for CPython will
> not be valid for pypy).
> Again, let me repeat that: wheels generated using setuptools are valid for
> CPython only if build on CPython. This is not the current setuptools
> behavior but will be for all setuptools build backend calls (I assume legacy
> will remain the same).

While I do think your proposal would work (on the assumption that
folks aren't use "pip wheel" to generate their wheel files for
upload), an alternative approach with a lower risk of unintended side
effects would be for *pip* to either rename the autobuilt file before
adding it to the cache, or else to adjust its caching strategy a bit
to internally separate a shared wheel download cache from
per-interpreter-compatibility-tag caches for locally built wheel


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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