I think I see what’s happened, the removal of these conditions in clang: don't set machine flags for overridden target by alyssais · Pull Request #317273 · NixOS/nixpkgs · GitHub was accidentally overridden by teleport: resolve broken for non-wasm builds by techknowlogick · Pull Request #320371 · NixOS/nixpkgs · GitHub .
I’ll try to raise a PR to actually remove these from teleport for good.