arm64 non-NixOS support on amd64?

[ghagl]

Hi!

I have binfmt working on my NixOS installation and it works for cross-compiled NixOS binaries, but not for non-NixOS aarch64 binaries. I think nix-ld should work for this purpose, but I am not sure how?

I get
qemu-aarch64: Could not open '/lib/ld-linux-aarch64.so.1': No such file or directory

My try:
programs.nix-ld.libraries = with pkgs; [ pkgsCross.aarch64-multiplatform.glibc ];

[Mic92]

The NixOS module in its current form only installs the ld.so for the native architecture:

ls -la /lib64/ld-linux-x86-64.so.2
lrwxrwxrwx root root 68 B 5 days ago  /lib64/ld-linux-x86-64.so.2@ ⇒ /nix/store/9bj6838cs8cw4yi4vzgigkwgsv5h1zbd-nix-ld-rs/libexec/nix-ld

You would need to compile nix-ld for aarch64 and than extend the module to also take care of the system link. Cross-compiling nix-ld should be fairly easy. The existing binfmt_misc options could be used to figure out what architecture to compile for.