[Distutils] Explicitly constructing SOABI for Python 2.7

[Nick Coghlan]

On 28 Jan 2014 23:29, "Daniel Holth" <dholth at gmail.com> wrote:
>
> +1
>
> However, on Windows, I don't see most of the config vars. At least the
> Unicode width is easy to get at in other ways.

It's less of an issue on Windows, since we're already assuming
python.orgbinary compatibility in most cases anyway.

However, I'll have a look and see if this info is exposed any other way.

> We also need to update the PEP/implementation to allow/add to the list
> of supported tags "py2.py3-none-(arch)" for cffi-type "doesn't use the
> ABI" extensions. This might just be a bug in the implementation...

That's definitely supposed to be allowed by the spec, specifically for that
ctypes/cffi style use case.  Now, whether the tools currently provide a way
to *generate* a tag like that is a different question :)

Cheers,
Nick.

>
> On Tue, Jan 28, 2014 at 5:40 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:
> > Currently, bdist_wheel doesn't set the ABI tag properly on Python 2.x
> > - the SOABI symbol it expects to find isn't present. PEP 425 also
> > disclaims dealing with the problem.
> >
> > However, PEP 3149 (which defined SOABI) explains how to define that
> > based on 3 other syconfig flags: Py_DEBUG, Py_UNICODE_SIZE and
> > WITH_PYMALLOC
> >
> >>>> sysconfig.get_config_var("SOABI")
> >>>> sysconfig.get_config_var("Py_DEBUG")
> > 0
> >>>> sysconfig.get_config_var("Py_UNICODE_SIZE")
> > 4
> >>>> sysconfig.get_config_var("WITH_PYMALLOC")
> > 1
> >
> > With those settings and the platform module (to get the current
> > implementation), it is possible to figure out that the wheel ABI tag
> > should be:
> >
> >     cp27mu
> >
> > If Py_DEBUG was true, then it would be "cp27dmu"
> > If WITH_PYMALLOC was false for some reason: "cp27u"
> > And for a narrow Unicode build: "cp27m"
> >
> > That way, the ABI tagging would work properly in 2.x as well, rather
> > than people getting the impression that wheels can't mark the ABI
> > compatibility requirements properly.
> >
> > Cheers,
> > Nick.
> >
> > --
> > Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
> > _______________________________________________
> > Distutils-SIG maillist  -  Distutils-SIG at python.org
> > https://mail.python.org/mailman/listinfo/distutils-sig
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