[vbezhenar]

Linux kernel API is stable. Why wouldn’t you able to run properly written program from 2009? I’m pretty sure it’ll run just fine.

[Macha]

glibc on the other hand is very much not.

[vbezhenar]

glibc is backwards-compatible as well.

[okanat]

Until it isn't. https://github.com/ValveSoftware/Proton/issues/6051

No glibc will not fix it and the rolling release distros are now patching their libc.

Here is the list of ABI breaking changes:

https://abi-laboratory.pro/?view=timeline&l=glibc

Also a system layer isn't just the C library. Other core Linux libraries often break their ABI too.