Forcing python39 on M1

[Rainer Müller]

On 12/03/2021 12.16, Peter West wrote:
>> I ran intoa brick wall with gexiv2, which was because the g-ir-* python files
>> were specifying python38. I tried building gobject-introspection with 39, but
>> fails. I don’t know whether I can classify this as a bug and make a report. In
>> any case, has anyone else been tinkering with python39 builds on M1?
> :info:build g-ir-scanner: GLib: warning: 627 warnings suppressed (use --warn-all
> to see them)
> :info:build Traceback (most recent call last):
> :info:build   File
> "/opt/local/var/macports/build/_Users_pbw_Software_ports_gnome_gobject-introspection/gobject-introspection/work/gobject-introspection-1.60.2/./g-ir-scanner",
> line 99, in <module>
> :info:build     sys.exit(scanner_main(sys.argv))
> :info:build   File "./giscanner/scannermain.py", line 615, in scanner_main
> :info:build     write_output(data, options)
> :info:build   File "./giscanner/scannermain.py", line 469, in write_output
> :info:build     passthrough_gir(main_f_name, temp_f)
> :info:build   File "./giscanner/scannermain.py", line 260, in passthrough_gir
> :info:build     parser.parse(path)
> :info:build   File "./giscanner/girparser.py", line 60, in parse
> :info:build     self.parse_tree(tree)
> :info:build   File "./giscanner/girparser.py", line 69, in parse_tree
> :info:build     self._parse_api(tree.getroot())
> :info:build   File "./giscanner/girparser.py", line 106, in _parse_api
> :info:build     for node in root.getchildren():
> :info:build AttributeError: 'xml.etree.ElementTree.Element' object has no
> attribute 'getchildren'

This specific method had been deprecated for a while and was eventually removed
in Python 3.9. It is a known problem at upstream that has already been fixed.
The fix would be included in gobject-introspection >= 1.65.0

https://gitlab.gnome.org/GNOME/gobject-introspection/-/issues/325

Your best option would be to also bump the port version to get a version
compatible with Python 3.9.

Rainer