It's not at all straightforward, it should be the kind of thing that's just a compiler flag, as opposed to needing to restructure your build process to support it.
It's not straightforward and yes it should be easier, but it's also not rocket science. Containers have made it approachable for the average developer.
Yeah that's what I meant. I also came across some script with redefinitions of C standard library functions that supposedly also allows you to link against older glibc symbols. I couldn't make it work.
Any half-decent SDK should allow you to trivially target an older platform version, but apparently doing trivial-seeming things without suffering is not The Linux Way™.
The reason that there is no SDK is because containers (and before that sysroots) are good enough that no one bothers to maintain the 100% usability solution.
