[agl-discussions] GPLv2 handling

[Martin Kelly]

Hi,

I noticed we recently started pulling in the meta-gplv2 layer for 
agl-demo and defaulting to its recipes in the AGL distro settings. 
Although I can see the reasoning for this, it also breaks a number of 
recipes because what's in meta-gplv2 is very old (e.g. readline 5 vs 
readline 7). I noticed this breakage when trying to build networkmanager 
(which needs at least readline 6), but I'm sure there are many other 
breakages because of such old recipes.

I'm wondering if anyone has objections to making this all controlled at 
the top-level, while preserving the current GPLv2 default.

My first thoughts on how to do this are:

- An AGL feature called "agl-demo-gplv3" that would add in agl-demo but 
not meta-gplv2.
- A DISTRO_FEATURE "gplv3", unset by default. If it is not set, then we 
make the PREFERRED_VERSION for various libraries default to gplv2 
versions in our distro settings.

There also may be better ways to achieve the same purpose that I have 
not thought of.

Please let me know your thoughts,

Martin