On 05. 10. 21 8:59, Nick Coghlan wrote:
On Tue, 28 Sep 2021, 6:55 am Brett Cannon, <[email protected]
<mailto:[email protected]>> wrote:
On Sun, Sep 26, 2021 at 3:51 AM Phil Thompson via Python-Dev
<[email protected] <mailto:[email protected]>> wrote:
However the stable ABI is still a second class citizen as it is
still
not possible (AFAIK) to specify a wheel name that doesn't need to
explicitly include each supported Python version (rather than a
minimum
stable ABI version).
Actually you can do this. The list of compatible wheels for a
platform starts at CPython 3.2 when the stable ABI was introduced
and goes forward to the version of Python you are running. So you
can build a wheel file that targets the oldest version of CPython
that you are targeting and its version of the stable ABI and it is
considered forward compatible. See `python -m pip debug --verbose`
for the complete list of wheel tags that are supported for an
interpreter.
I think Phil's point is a build side one: as far as I know, the process
for getting one of those more generic file names is still to build a
wheel with an overly precise name for the stable ABI declarations used,
and then rename it.
The correspondence between "I used these stable ABI declarations in my
module build" and "I can use this more broadly accepted wheel name" is
currently obscure enough that I couldn't tell you off the top of my head
how to do it, and I contributed to the design of both sides of the equation.
Actually improving the build ergonomics would be hard (and outside
CPython's own scope), but offering a table in the stable ABI docs giving
suggested wheel tags for different stable ABI declarations should be
feasible, and would be useful to both folks renaming already built
wheels and anyone working on improving the build automation tools.
Indeed, thinking about proper wheel tags, and adding support for them in
both pip/installer and setuptools/build/poetry/etc., would be a very
helpful way to contribute to the stable ABI.
I don't think I will be able to get to this any time soon.
The current `abi3` tag doesn't encode the minimum ABI version. AFAIK
that info should go in the "Requires-Python" wheel metadata, but there's
not automation or clear guides for that. Putting it in the wheel tag
might be a good idea.
There are vague ideas floating around about removing old stable ABI
features (hopefully after they're deprecated for 5-10 years); if there's
a new wheel tag scheme it should be made with that possibility in mind.
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