Re: rust and python

On 02/02/2026 06:33, Marco Atzeri via Cygwin-apps wrote:
> On 01/02/2026 22:59, Jon Turney via Cygwin-apps wrote:
>> On 06/01/2026 11:21, Christoph Reiter via Cygwin-apps wrote:
>>> Not sure if this is the cause here, but maturing defaults to
>>> "cygwin_86_64" because of me since
>>> https://github.com/PyO3/maturin/pull/2819
>>> I suggested on this list some months ago to change sysconfig to match
>>> it like: https://gist.github.com/lazka/c8146c08c0ebe5beb43b6ffb6c2ae51b
>>> so pip stays happy across cygwin DLL updates
>>
>> Thanks for the link.
>>
>> I added an extra bit of reporting in the latest version of cygport so 
>> it reports the wheel filename it's choking on:
>>
>>> Installing python-cryptography-46.0.3-1.x86_64
>>> *** Info: installing 3.9
>>> *** ERROR: unknown wheel filename: cryptography-46.0.3-cp312-abi3- 
>>> cygwin_86_64.whl
>>
>> I'm kind of confused where the 'x' in 'x86_64' has gone here?
>>
>> That seems kind of wrong to me -'86_64' isn't the name of anything.
>>
>> But I thought anyhow, I should just change cygport to accept that, but 
>> currently, if we try to feed that wheel name into 'pip install', it 
>> fails with:
>>
>>> ERROR: cryptography-46.0.3-cp39-abi3-cygwin_86_64.whl is not a 
>>> supported wheel on this platform.
>>
>> ... so I'm not sure what's supposed to be happening here.
>>
> 
> It is python rejecting it.

Indeed. With that overly-prescriptive check on the wheel filename 
disabled in cygport:

> $ cygport python-cryptography.cygport all
>>>> Preparing python-cryptography-46.0.3-1.x86_64
>>>> Unpacking source cryptography-46.0.3.tar.gz
>>>> Preparing working source directory
>>>> Compiling python-cryptography-46.0.3-1.x86_64
> *** Info: building 3.9
> Processing ./.
>   Preparing metadata (pyproject.toml): started
>   Preparing metadata (pyproject.toml): finished with status 'done'
> Building wheels for collected packages: cryptography
>   Building wheel for cryptography (pyproject.toml): started
>   Building wheel for cryptography (pyproject.toml): still running...
>   Building wheel for cryptography (pyproject.toml): finished with status 'done'
>   Created wheel for cryptography: filename=cryptography-46.0.3-cp39-abi3-cygwin_86_64.whl size=2390885 sha256=51a667a083bc830f548621a94028851f397cac050261ffb8c5d5e2feab1223e1
>   Stored in directory: /tmp/pip-ephem-wheel-cache-dlflshcs/wheels/b6/b3/32/6fdb21abd3a0326a1c54156f0baaff9082c452761a71694d2a
> Successfully built cryptography
[...]
>>>> Installing python-cryptography-46.0.3-1.x86_64
> *** Info: installing 3.9
> ERROR: cryptography-46.0.3-cp39-abi3-cygwin_86_64.whl is not a supported wheel on this platform.
> *** ERROR: pip3.9 install failed


The "not a supported wheel" error comes from 'pip install'.

As Marco notes, you can work around this by renaming the .whl file to 
the expected form.

So, I don't quite understand how this works on msys2? Is there some 
other change needed elsewhere? Or are we installing wheels the wrong way?