Cross-compilation is working very well now!

[dpc]

I'm pleased to announce that cross-compilation to all major targets is working, both on Linux and Darwin.

Note that this includes sqlite, openssl, rocksdb which are non-Rust and somewhat tricky.

It also includes dev shell, so it's possible to cross-compile with cargo build --target ....

On x86_64 Linux:

> nix build -L .#fullChecks
> ls -alh result/
total 20M
dr-xr-xr-x     2 root root   4.0K Dec 31  1969 .
drwxrwxr-t 31090 root nixbld  20M Oct  9 18:53 ..
lrwxrwxrwx     3 root root    107 Dec 31  1969 workspace-cross-compile-group-armv7-linux-androideabi-dev-0.0.1 -> /nix/store/vqgdk8qjgldgbl1ik2wd4hrmb7m4il7g-workspace-cross-compile-group-armv7-linux-androideabi-dev-0.0.1
lrwxrwxrwx     3 root root    102 Dec 31  1969 workspace-cross-compile-group-i686-linux-android-dev-0.0.1 -> /nix/store/p67sfhxm2ahhrifims0prcccpldkkd6s-workspace-cross-compile-group-i686-linux-android-dev-0.0.1
lrwxrwxrwx     3 root root    104 Dec 31  1969 workspace-cross-compile-group-x86_64-linux-android-dev-0.0.1 -> /nix/store/7wymizhq6r4ckyh75w60n0wzq6hdl1ff-workspace-cross-compile-group-x86_64-linux-android-dev-0.0.1
lrwxrwxrwx     3 root root    109 Dec 31  1969 workspace-cross-compile-workspace-aarch64-linux-android-dev-0.0.1 -> /nix/store/vk12j1xavdkz6vphdbgp9y3x0xb6swvh-workspace-cross-compile-workspace-aarch64-linux-android-dev-0.0.1
lrwxrwxrwx     3 root root    113 Dec 31  1969 workspace-cross-compile-workspace-aarch64-unknown-linux-gnu-dev-0.0.1 -> /nix/store/jpyqpg4970czwglk4avaa1zfwxp4sg19-workspace-cross-compile-workspace-aarch64-unknown-linux-gnu-dev-0.0.1
lrwxrwxrwx     2 root root    111 Dec 31  1969 workspace-cross-compile-workspace-armv7-linux-androideabi-dev-0.0.1 -> /nix/store/8r2dhx82c8zqg4981dcif4cwkr02pl02-workspace-cross-compile-workspace-armv7-linux-androideabi-dev-0.0.1
lrwxrwxrwx     3 root root     87 Dec 31  1969 workspace-cross-compile-workspace-dev-0.0.1 -> /nix/store/zrxyx0hg9bd4mkypdnv4yaff6gqz59rm-workspace-cross-compile-workspace-dev-0.0.1
lrwxrwxrwx     2 root root    106 Dec 31  1969 workspace-cross-compile-workspace-i686-linux-android-dev-0.0.1 -> /nix/store/03qmaxiyb8z2c9bchzahab85jg26ipak-workspace-cross-compile-workspace-i686-linux-android-dev-0.0.1
lrwxrwxrwx     3 root root    110 Dec 31  1969 workspace-cross-compile-workspace-i686-unknown-linux-gnu-dev-0.0.1 -> /nix/store/xmhlhk9rlhl88rg587x8yv9vz334i1i8-workspace-cross-compile-workspace-i686-unknown-linux-gnu-dev-0.0.1
lrwxrwxrwx     2 root root    108 Dec 31  1969 workspace-cross-compile-workspace-x86_64-linux-android-dev-0.0.1 -> /nix/store/0ram42zqphjp8cl7439k98nkkb2l5j4i-workspace-cross-compile-workspace-x86_64-linux-android-dev-0.0.1
lrwxrwxrwx     3 root root    112 Dec 31  1969 workspace-cross-compile-workspace-x86_64-unknown-linux-gnu-dev-0.0.1 -> /nix/store/3x59mdy3z11byw0mmwjf9yq9yw5q5h4l-workspace-cross-compile-workspace-x86_64-unknown-linux-gnu-dev-0.0.1

On aarch64 MacOS:

$ ls -alh result/
total 0
dr-xr-xr-x    10 root wheel   320 Dec 31  1969 .
drwxrwxr-t 11745 root nixbld 368K Oct  9 21:51 ..
lrwxr-xr-x     1 root wheel   109 Dec 31  1969 workspace-cross-compile-workspace-aarch64-linux-android-dev-0.0.1 -> /nix/store/l54h28vpqiskc69dmh9d8k2j8f17ga3c-workspace-cross-compile-workspace-aarch64-linux-android-dev-0.0.1
lrwxr-xr-x     1 root wheel   113 Dec 31  1969 workspace-cross-compile-workspace-aarch64-unknown-linux-gnu-dev-0.0.1 -> /nix/store/g34sj5isr3a27p0dr1ryml3bbv4rxid3-workspace-cross-compile-workspace-aarch64-unknown-linux-gnu-dev-0.0.1
lrwxr-xr-x     1 root wheel   111 Dec 31  1969 workspace-cross-compile-workspace-armv7-linux-androideabi-dev-0.0.1 -> /nix/store/pq3sjhqqd8bb014w3fr6lflsp0v6zl3p-workspace-cross-compile-workspace-armv7-linux-androideabi-dev-0.0.1
lrwxr-xr-x     1 root wheel    87 Dec 31  1969 workspace-cross-compile-workspace-dev-0.0.1 -> /nix/store/vp8x07xnm5hx9irxscf8pik4q1qs4sz5-workspace-cross-compile-workspace-dev-0.0.1
lrwxr-xr-x     1 root wheel   106 Dec 31  1969 workspace-cross-compile-workspace-i686-linux-android-dev-0.0.1 -> /nix/store/xkmlqbg9xkq4sy7vxdhsr6zl91pnql0z-workspace-cross-compile-workspace-i686-linux-android-dev-0.0.1
lrwxr-xr-x     1 root wheel   110 Dec 31  1969 workspace-cross-compile-workspace-i686-unknown-linux-gnu-dev-0.0.1 -> /nix/store/zn3dxix04r1jkwlkqwnbr8sgy86b810b-workspace-cross-compile-workspace-i686-unknown-linux-gnu-dev-0.0.1
lrwxr-xr-x     1 root wheel   108 Dec 31  1969 workspace-cross-compile-workspace-x86_64-linux-android-dev-0.0.1 -> /nix/store/xskrzzf0jyc8vwcwkb0yjmgxygb76n7l-workspace-cross-compile-workspace-x86_64-linux-android-dev-0.0.1
lrwxr-xr-x     1 root wheel   112 Dec 31  1969 workspace-cross-compile-workspace-x86_64-unknown-linux-gnu-dev-0.0.1 -> /nix/store/45268ikp7nx94nany63009rvvmi0qzx4-workspace-cross-compile-workspace-x86_64-unknown-linux-gnu-dev-0.0.1