Kind of funny to realize, the NT kernel ABI isn’t even all that stable itself; it is just wrapped in a set of very stable userland exposures (Win32, UWP, etc.), and it’s those exposures that Windows executables are relying on. A theoretical Windows PE binary that was 100% statically linked (and so directly contained NT syscalls) wouldn’t be at-all portable between different Windows versions.

Linux with glibc is the complete opposite; there really does exist old Linux software that static-links in everything down to libc, just interacting with the kernel through syscalls—and it does (almost always) still work to run such software on a modern Linux, even when the software is 10-20 years old.

I guess this is why Linux containers are such a thing: you’re taking a dynamically-linked Linux binary and pinning it to a particular entire userland, such that when you run the old software, it calls into the old glibc. Containers work, because they ultimately ground out in the same set of stable kernel ABI calls.

(Which, now that I think of it, makes me wonder how exactly Windows containers work. I’m guessing each one brings its own NTOSKRNL, that gets spun up under HyperV if the host kernel ABI doesn’t match the guest?)

At least glibc uses versioned symbols. Hundreds of other widely-used open source libraries don't.

I only learned about glibc earlier today, when I was trying to figure out why the Nix version of a game crashes on SteamOS unless you unset some environ vars.

Turns out that Nix is built against a different version of glibc than SteamOS, and for some reason, that matters. You have to make sure none of Steam's libraries are on the path before the Nix code will run. It seems impractical to expect every piece of software on your computer to be built against a specific version of a specific library, but I guess that's Linux for you.

Ask your friend if he would CC0 the quote or similar (not sure if its possible but like) I can imagine this being a quote on t-shirts xD

Honestly I might buy a T-shirt with such a quote.

I think glibc is such a pain that it is the reason why we have so vastly different package management and I feel like non glibc things really would simplify the package management approach to linux which although feels solved, there are definitely still issues with the approach and I think we should still all definitely as such look for ways to solve the problem