(06-12-2018, 11:56 PM)Dworin Wrote: How about a kind of clean chroot system that lets you choose which distro is used for building a package?

I had such an idea in mind for an automated packages build.
Start with an empty directory, and install only the dependencies. This way you can ensure that you got all the dependencies right, and that your software is gonna work correctly.

Now to add on top of the cross-distro idea, the best solution would be, IMO, to go with static linkage.
This would make your binaries work on any host with the same architecture, no matter the libc, of libraries installed.
This is also faster to run, and definitely not bigger than say, snap or flatpack "apps", which ship all the full runtime dependencies along with each software.

For the repository, I prefer going with how crux handles it, rather than arch: maintainers host the repositories themselves, instead of pushing to a central repo.
This has the advantage to give more responsibility to maintainers, and prevent orphanage. Web hosting is now cheap, and you could even use online "hubs" to host your port tree like http://repo.or.cz.