nix-repl> pkgs.zig_0_9
error:
       … while calling the 'throw' builtin
         at /home/ross/nixpkgs/pkgs/top-level/stage.nix:206:18:
          205|       lib.mapAttrs (
          206|         name: _: throw "${name} ${type} is not available, please enable config.${configOption}"
             |                  ^
          207|       ) pkgs;

       error: zig_0_9 package is not available, please enable config.allowAliases

In reply to @rosscomputerguy:matrix.org

  mkOptionalOverlay =
    {
      configOption,
      type,
      overlay,
    }:
    self: super:
    let
      pkgs = overlay self super;
    in
    if config."${configOption}" then
      pkgs
    else
      lib.mapAttrs (
        name: _: throw "${name} ${type} is not available, please enable config.${configOption}"
      ) pkgs;

In reply to @rosscomputerguy:matrix.org

nix-repl> pkgs.zig_0_9
error:
       … while calling the 'throw' builtin
         at /home/ross/nixpkgs/pkgs/top-level/stage.nix:206:18:
          205|       lib.mapAttrs (
          206|         name: _: throw "${name} ${type} is not available, please enable config.${configOption}"
             |                  ^
          207|       ) pkgs;

       error: zig_0_9 package is not available, please enable config.allowAliases

In reply to @aleksana:mozilla.org
Does this override already existed throws?

In reply to @rosscomputerguy:matrix.org
I wanted to move pkgsCross to variants but it seems necessary for a good chunk of nixpkgs lol

In reply to @rosscomputerguy:matrix.org
A bunch of packages use it for tests, others will pull things from pkgsCross of a different system and add it in

pkgs/top-level/all-packages.nix:    hello-x86_64 = if stdenv.hostPlatform.isx86_64 then hello else pkgsCross.gnu64.hello;
pkgs/top-level/all-packages.nix:        hello-x86_32 = if stdenv.hostPlatform.isx86_32 then hello else pkgsCross.gnu32.hello;
pkgs/top-level/all-packages.nix:      pkgsCross.gnu32.callPackage ../applications/emulators/box86 args
pkgs/top-level/all-packages.nix:      pkgsCross.armv7l-hf-multiplatform.callPackage ../applications/emulators/box86 args
pkgs/top-level/all-packages.nix:  #     pkgsCross.aarch64-multiplatform.freshBootstrapTools.build
pkgs/top-level/all-packages.nix:    gccCross = pkgsCross.ben-nanonote.buildPackages.gccWithoutTargetLibc;
pkgs/top-level/all-packages.nix:    avrgcc = pkgsCross.avr.buildPackages.gcc;
pkgs/top-level/all-packages.nix:    avrlibc = pkgsCross.avr.libcCross;
pkgs/top-level/all-packages.nix:    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
pkgs/top-level/all-packages.nix:    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;

What...

Yeah, I think that's good. We can do something like this:

• Merge the optional overlay PR
• Go through and make a tree-wide PR for each nixpkgs variant to move things over the best we can (we'll probably have like 4 PR's lol)
• Disable allowVariants in CI