cmake enabling LINUXGPIO on ubuntu 20.04 fails about avrdude HOT 4 CLOSED

You could have a look at the linked branch I pushed. But this is only compile tested against libgpiod v1.4 on a recent Ubuntu 22.04.
Another option would be to require at least libgpiod v1.6 and to ignore any older version.

from avrdude.

@mhei

It seems to me some distros are still shipping with older version of libgpiod.
https://repology.org/project/libgpiod/versions

I am okay with bunping up the minimum libgpiod version to v1.6. But I will leave that decision to @stefanrueger.

from avrdude.

The question is whether it is necessary to support libgpiod stuff on all these distros - it was not the case until now, right? From my point of view, many users are using avrdude with GPIO stuff on Raspi and similar embedded platforms - so it might make sense to focus a little bit. On the other hand, the patch is small and I think keeping it for one or two releases might help.
And this is another topic: when is the next release of avrdude scheduled? Is there a fixed/usual timeline? What distros are expected to pickup which release then?
I'll try to test the patch on a Raspi with recent Raspberry Pi OS but libgpiod v1.4 - might take some time though.

from avrdude.

You could have a look at the linked branch I pushed.

That looks good and works on ubuntu 20.04

The question is whether it is necessary to support libgpiod stuff on all these distros - it was not the case until now, right?

Correct. However, the project prides itself on being backwards compatible, also just in the sense of its ability to build on a wide range of distros. 20.04 sounds old, but considering it's supported until 2030, there is ample justification to make AVRDUDE build, even if an older libgpiod is installed. @mhei Could you submit a PR with your branch, please?

next release of avrdude

There isn't a fixed schedule but we aim at twice a year (early Jan, early July) if there is enough interesting innovation to share.

What distros are expected to pickup which release then?

We don't control any of that, but you could have a look at the repology.org page (https://repology.org/project/avrdude/versions):

from avrdude.