[gentoo-dev] About adding a *warning* to remind maintainers to check for new PYTHON_COMPAT values

[Pacho Ramos]

Hello

Looking to the list of packages still not supporting python 3.5:
https://qa-reports.gentoo.org/output/gpyutils/34-to-35.txt

and considering that we should even start testing python 3.6, I think it would
be nice if we could make portage to warn when PYTHON_COMPAT value is not
updated. It's really frustrating to still see new ebuilds being added with
obsolete values for PYTHON_COMPAT and relying on a few people looking to update
this. This is also causing huge delays to migrate to newer python versions and I
think it's responsibility of the maintainer to ensure his/her package is
supported on newer versions or, at least, have a bug and ping upstream for the
cases they need further fixing.

Of course, this wouldn't be a fatal check preventing you from committing a
package with outdated PYTHON_COMPAT, it would be a warning to remind you to
update it as soon as possible.

Any issues on trying to go further into implementing this warning? 

Thanks a lot