On Wed, 19 May 2021 22:09:59 +0100, Jon Turney
> On 19/05/2021 20:32, Ken Brown via Cygwin-apps wrote:
> > Trying to build harfbuzz, I get the following python failure with
> > python-3.8
> >
> > Traceback (most recent call last):
....
> >    File "/usr/lib/gobject-introspection/giscanner/xmlwriter.py", line
> > 46, in <module>
> >      from giscanner._giscanner import collect_attributes
> > ImportError: dynamic module does not define module export function
> > (PyInit__giscanner)
> 
> This a problem with the gobject-introspection package.
> 
> _giscanner.dll is linked with python2, but the shbang names 'python', which is now python3.
> 
> I have been working on rebuilding this package, but not quite there yet.
> 
> You can work around this by fixing the shebang in /usr/bin/g-ir-scanner to explicitly name python3.


Here are patches...

* 0002-gobject-introspection-1.54.1-4.patch:
    python3.8 is used explicitly.
      Shebangs of g-ir-doc-tool and g-ir-scanner are '/usr/bin/env python3.8'
      _giscanner.dll is linked with libpython3.8.dll

* 0001-Fix-a-patch-for-giscanner-shlibs.py-to-pass-a-pep8-c.patch:
    This has no effect while building.
    But needed in order to avoid an error in a test
      cygport gobject-introspection.cygport test

And with them, following build and test by cygport has succeeded
both in x86_64 and i686, on my local machine.

  cygport gobject-introspection.cygport download finish all test


But on scallywag, only x86_64 build is successful:
https://cygwin.com/cgi-bin2/jobs.cgi?id=2841


Regards,

Lem