@Ericson2314, thanks for your PR! By analyzing the history of the files in this pull request, we identified @edolstra, @bgamari, @aszlig, @LnL7 and @copumpkin to be potential reviewers.

This looks like it's a mass-rebuild? Definitely should go into staging first then.

Only for cross. Native hashes are unchanged. It would be prettier of it were a mass rebuild :).

It would be helpful, if you can't split this up further, if you summarized what you changed and why. It's pretty hard to review 1200+ lines of diff changing all sorts of core behavior in difficult-to-follow ways.

Or if there's a high-level description of why and the new design, that would also help. A giant mass of code changing core stdenv stuff is hard though 😄

I'll split off the first few lib changes. Those are easy cause they don't change any hashes. In the rest, turns out I am getting a native rebuild which is very odd. I'll beef up commit messages etc while fixing that. Sorry for the jumble, but I wrote all these changes very hastily to begin with 😁.

Split out #25099, which is merged. edit merged.

Split out tiny cleanup #25186 which also doesn't change any hashes.

Split out #25194, which redefines stdenv.cross and replaces a few gcc-related uses invalidated by the new definition. edit merged.

http://hydra.nixos.org/jobset/nixpkgs/pr-25047 for regression test.

So how do you test on Darwin? I've tried:

$ nix-build pkgs/top-level/release-cross.nix -A rpi.unzip
these derivations will be built:
  /nix/store/v8a9ibjxnwk275a5ly7a6fyv7ma3swdm-unzip-6.0-armv6l-unknown-linux-gnueabi.drv
building path(s) ‘/nix/store/vf1vjls11ss078wa27h8hkmpkm2z2b9n-unzip-6.0-armv6l-unknown-linux-gnueabi’
error: a ‘x86_64-linux’ is required to build ‘/nix/store/v8a9ibjxnwk275a5ly7a6fyv7ma3swdm-unzip-6.0-armv6l-unknown-linux-gnueabi.drv’, but I am a ‘x86_64-darwin’

@matthewbauer Uh I was using this in conjunction with @shlevy's impure iOS stuff on darwin. As I found when I added the last commit adding some darwin tests, more work will be needed to test end-to-end purely :(. I'll get to that, though.

If you want, try building buildPackages.binutils on darwin and linking by hand or something.

After slaving away to make it hash-preserving I peeled off #25227 with...the first commit.

It's a lot of work to make something hash preserving, but whenever I go for it I inevitably find a real bug.

edit merged.

Any update on this pull request?

Closing due to lack of activity, feel free to reopen this if needed.