Python C Extension Module loading issue on Cygwin

[Eliot Moss]

On 11/27/2023 12:49 PM, Marco Atzeri via Cygwin wrote:
> On 22.09.2023 08:39, Mesibo Technical via Cygwin wrote:
>> This issue is about Python on Cygwin not using the recommended module extension.
> [cut]
>> Any idea why Cygwin is using the .dll extension instead of the .pyd
>> extension as recommended by Python's official documentation?
>> Additionally, is there a way to know during runtime the specific
>> extension used by a particular version of Python, without having to
>> make assumptions based on the system type?
> 
> Cygwin is Unix on Windows, so the dll extension is equivalent
> to the so extension on Linux/Unix.
> I am almost sure that we are not modifying the source code for this specific issue. But I could be wrong

Allow me to add that Cygwin is not a virtual machine in the sense of
WSL (Windows Subsystem for Linux), VirtualBox, etc.  Rather, it consists
of a dll library that does a pretty good job mapping POSIX library
functions to Windows ones, and large collections of programs and libraries
that have been ported to the Cygwin environment, including X windows.

In any case, this means that it follows Windows linking conventions and
object formats.

HTH understand why tings are as they are.

Regards - Eliot Moss