Re: The Wheel specification and compatibility tags on Windows

I would like to revive this 5 year old thread and see if we can stir things
up a bit.

Basically the problem is that, in the current state of the PEPs and build
tools, it is still not possible to build and distribute a Windows wheel
that includes an extension module compiled with Py_LIMITED_API.
Setuptools can successfully build such extension module on Windows (with
`.pyd` file extension and no extra specifiers in the module filename), and
these seems to work at least on CPython 3.5 and above. However the
`--py-limited-api cpXX` option of bdist_wheel command fails on Windows
because it attempts to use the `abi3` tag but the latter is not in the list
of compatible tags for that platform.
One can work around this by creating a wheel with `none` as the abi tag,
and `cp35.cp36.cp37` as the python implementation tag but this feels a bit
hackish.

Here are some unresolved questions from the old distutils-sig thread,
quoting Paul Moore:

> 2. How should tools determine which ABIs a given Python supports?
> (This is the get_supported function in wheel and distlib). The "Use"
> section of the PEP (http://www.python.org/dev/peps/pep-0425/#id1)
> gives a Linux-based example, but nothing normative and nothing that is
> understandable to a Windows user.

And from Vinay Sajip

> For Windows, we (eventually) need some low-level sysconfig-supported way
> to get the ABI information in an analogous way to how it happens on
POSIX: and
> because that's not currently there, distlib doesn't provide any ABI
information
> on Windows other than "none".

Other related links:
https://github.com/pypa/pip/issues/4445
https://mail.python.org/pipermail/distutils-sig/2018-January/031856.html

So.. what needs to be done here to allow distributing/installing Windows
wheels with Py_LIMITED_API support?
Thank you,

Cosimo Lupo

-- 
Cosimo Lupo

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