NixOS build should be tested in CI

[lolbinarycat]

rustc bootstrap contains a lot of code specifically for making builds work smoothly on nixos... however, none of this code seems to be tested by CI.

recently, it seems that the addition of libstdc++ as a dependency of rustc has broken builds on nixos. i think stage1 should be built for nixos as part of CI to prevent this from happening in the future.

[tgross35]

This may be worth bringing up on the infra zulip for discussion https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra

@rustbot label +T-infra +A-ci +O-NixOS -needs-triage

[tgross35]

Also could you link to any related nix issues or build failures? We need to understand what exactly breaks or is broken.