Darwin cross pkgsBuildBuild/pkgsBuildHost evaluation regression #355622
Description
Describe the bug
The pkgsBuildHost.<x> and pkgsBuildBuild.<x> derivations evaluate differently when using a cross-compiling nixpkgs instance (darwin -> linux). This is expected for packages like pkg-config where host matters, but not for everything else (e.g. jq). The end result is that almost everything in nativeBuildInputs misses the binary cache and needs to be rebuilt. This could be fixed by moving these packages to depsBuildBuild, but this is a massive change both in nixpkgs and downstream projects.
This is a regression from nixos-24.05. It also works as expected when cross-compiling x86_64-linux -> aarch64-linux, so I think it's something specific to the darwin stdenv in unstable.
Steps To Reproduce
nix-repl> pkgs = import nixpkgs { system = "aarch64-darwin"; }
nix-repl> pkgsCross = import nixpkgs { system = "aarch64-darwin"; crossSystem = "aarch64-linux"; }
nix-repl> pkgs.jq
«derivation /nix/store/gsdqx9n5hclwkadf6hxhlqhd309sb3nn-jq-1.7.1.drv»
nix-repl> pkgsCross.pkgsBuildBuild.jq
«derivation /nix/store/gsdqx9n5hclwkadf6hxhlqhd309sb3nn-jq-1.7.1.drv»
nix-repl> pkgsCross.pkgsBuildHost.jq
«derivation /nix/store/wxq745g9912lmyakff9mpmjnf3rx6dd3-jq-1.7.1.drv»
Expected behavior
nix-repl> pkgs = import nixpkgs { system = "aarch64-darwin"; }
nix-repl> pkgsCross = import nixpkgs { system = "aarch64-darwin"; crossSystem = "aarch64-linux"; }
nix-repl> pkgs.jq
«derivation /nix/store/gsdqx9n5hclwkadf6hxhlqhd309sb3nn-jq-1.7.1.drv»
nix-repl> pkgsCross.pkgsBuildBuild.jq
«derivation /nix/store/gsdqx9n5hclwkadf6hxhlqhd309sb3nn-jq-1.7.1.drv»
nix-repl> pkgsCross.pkgsBuildHost.jq
«derivation /nix/store/gsdqx9n5hclwkadf6hxhlqhd309sb3nn-jq-1.7.1.drv»
Additional context
Nixpkgs revision: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
Notify maintainers
@NixOS/darwin-team
Metadata
- system: `"aarch64-darwin"`
- host os: `Darwin 23.6.0, macOS 14.6.1`
- multi-user?: `yes`
- sandbox: `no`
- version: `nix-env (Nix) 2.18.1`
- nixpkgs: `/nix/store/808lp63z6yiraikjpzcfk3xg1frpd2s0-source`
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