apple_sdk_11_0: make available for use on x86_64-darwin #176661

reckenrode · 2022-06-07T04:55:59Z

Description of changes

I discussed with @toonn on Matrix yesterday and this morning about the possibility of using the aarch64-darwin SDK on x86_64-darwin as an interim solution for software that needs a newer SDK. This was prompted by my wanting to build MoltenVK without needing Xcode.

I opened the PR against master because the changes required were quite small, and there are no rebuilds. The basic functionality tested was MoltenVK built with the SDK from nixpkgs (no Xcode).

See below for a screenshot of a functional demo app built almost entirely with nixpkgs (vkcube.app in vulkan-tools unfortunately requires ibtool from Xcode, but the actual code is compiled against the 10.12 SDK in nixpkg and linked against a MoltenVK built with the 11.0 SDK). A PR for MoltenVK will be forthcoming once this lands.

Sandbox: set to relaxed.

Things done

reckenrode · 2022-06-07T05:00:57Z

@thefloweringash Also pinging you since you did the initial work on the 11.0 SDK.

nixos-discourse · 2022-06-07T05:05:30Z

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/902

toonn

LGTM

Only part I wonder about is why libobjc and Libsystem were gotten from the source releases before, I think that's the biggest change?

doc/stdenv/platform-notes.chapter.md

reckenrode · 2022-06-07T11:37:50Z

LGTM

Only part I wonder about is why libobjc and Libsystem were gotten from the source releases before, I think that's the biggest change?

It’s conditional based on the platform. On aarch64-darwin, they come from the SDK. What this change does is always get them from the 11.0 SDK regardless (while keeping the defaults for each platform as-is).

# Pick the source of libraries: either Apple's open source releases, or the
# SDK.
useAppleSDKLibs = stdenv.hostPlatform.isAarch64;

selectAttrs = attrs: names:
  lib.listToAttrs (lib.concatMap (n: if attrs ? "${n}" then [(lib.nameValuePair n attrs."${n}")] else []) names);

chooseLibs = (
  # There are differences in which libraries are exported. Avoid evaluation
  # errors when a package is not provided.
  selectAttrs (
    if useAppleSDKLibs
      then apple_sdk
      else appleSourcePackages
  ) ["Libsystem" "LibsystemCross" "libcharset" "libunwind" "objc4" "configd" "IOKit"]
) // {
  inherit (
    if useAppleSDKLibs
      then apple_sdk.frameworks
      else appleSourcePackages
  ) Security;
};

SuperSandro2000 · 2022-06-07T13:13:06Z

doc/stdenv/platform-notes.chapter.md

+  { stdenv, overrideCC, xcbuild, AppKit, Foundation, Libsystem }:
+  let
+    clang_11_0 = stdenv.cc.override {
+      bintools = stdenv.cc.bintools.override { libc = Libsystem; };
+      libc = Libsystem;
+    };
+    stdenv_11_0 =
+      if stdenv.isx86_64 then
+        (overrideCC stdenv clang_11_0).override
+          {
+            targetPlatform = stdenv.targetPlatform // {
+              darwinMinVersion = "10.12";
+              darwinSdkVersion = "11.0";
+            };
+          }
+      else
+        stdenv;
+      xcbuild_11_0 = xcbuild.override { stdenv = stdenv_11_0; };
+    in
+    stdenv_11_0.mkDerivation {
+      buildInputs = [ AppKit Foundation ];
+      nativeBuildInputs = [ xcbuild_11_0 ];
+      # ...
+    }


If we want to use this in nixpkgs I would suggest the following points.

be very careful. I think mixing SDKs could easily backfire and we need to carefully test this to make sure we don't break everything.

Can we add this to top level to make sure all packages use the same overrides? It would also make updating easier in case we discover bugs and need to change things later. This would mean we move this to top-level or darwin packages and remove the nix code here.

After discussing it with @toonn on Matrix, I pushed an update that adds a stdenv attribute to the 11.0 SDK attribute.

willcohen · 2022-06-09T14:55:42Z

Just thinking about EOL dates, planning for this seems like a very reasonable stopgap between now and the next stable release. Since 10.15 is going to be EOL this fall, macOS 11 will be the oldest supported release at that time. I know that the tentative plan for #101229 is to try to get SDKs bumped by the fall nixos release, and if it's feasibly to get that up to macOS 11 by then, this workaround may have a max shelf life of something like 6 months and will be a chance to get all the stuff that's been lagging on darwin up to speed in advance of that bump (getting Qt 5.15 and 6 stuff settled, anything using go, etc)

toonn · 2022-06-09T18:28:56Z

We're not bumping that far. And I'm not entirely sure we even should keep up with Apple's support schedule. That leaves a lot of hardware out there without access to Nixpkgs and no tangible advantage for users on more recent systems.

The current idea is to keep the default SDK recent-ish (emphasis on the ish) and provide ways to build with newer SDKs only for packages that really need it.

toonn

I think this is the most elegant way to expose this so it looks good to me.

willcohen · 2022-06-09T19:12:44Z

Makes sense — sorry for the confusion!

SuperSandro2000

LGTM

toonn · 2022-06-10T10:39:25Z

One sensible test that someone on aarch64-darwin should run is whether this has any effect on bootstrapping stdenv.

reckenrode · 2022-06-10T12:22:47Z

One sensible test that someone on aarch64-darwin should run is whether this has any effect on bootstrapping stdenv.

What would be the best way to do that? When I try to build stdenv on aarch64-darwin after applying the change, nix still gets it from the cache.

I’m running nix store gc right now to clear things out, so I can disable substituters (--option substituters '' and have it rebuild as much as possible, but that’s going to take some time.

reckenrode · 2022-06-11T00:53:47Z

After running nix store gc, and trying to rebuild stdenv, I get an error.

$ nix build --rebuild .#stdenv --option substituters ''
error: derivation '/nix/store/f6d7lwrknzcwbsjds36sgfl6cqpp82qy-bootstrap-stage0-clang-wrapper-11.1.0.drv' requires non-existent output 'out' from input derivation '/nix/store/ns4bvhwbwjjwizgvm4h0yf5gz2p7x7mf-bash-5.1-p16.drv'

Running this on master, I also get a (different) error.

$ nix build --rebuild github:NixOS/nixpkgs#stdenv --option substituters ''
error: derivation '/nix/store/4xfgcw1ajb12hjgvqa2rxz2m88w6ab6x-clang-11-12-LLVMgold-path.patch.drv' requires non-existent output 'lib' from input derivation '/nix/store/rd66ahrsdnghs9yjibscm7rrxlw09afq-llvm-11.1.0.drv'

toonn · 2022-06-13T09:41:11Z

@reckenrode, does the new build command have a similar option to --check? That should normally rebuild rather than substitute even if it's already in the store.

Those errors don't look good though, it seems that stdenv doesn't even build on master?

reckenrode · 2022-06-13T12:43:48Z

@reckenrode, does the new build command have a similar option to --check? That should normally rebuild rather than substitute even if it's already in the store.

I think --rebuild does the same thing. It rebuilds the derivation then compares it to the original. That succeeds; but, as far as I know, it’s not doing a bootstrap of stdenv (because none of the inputs changed).

Those errors don't look good though, it seems that stdenv doesn't even build on master?

That’s the way I read it, assuming disabling substituters is a supported scenario. Is there a better way of forcing a bootstrap of stdenv? I tried changing the name of bootstrapTools in its derivation this morning, and stdenv is rebuilding now, but that seems kind of hacky.

reckenrode · 2022-06-13T15:08:28Z

Following up: the hacky approach worked (changed name = "bootstrap-tools"; to name = "bootstrap-tools-foo";. The aarch64-darwin stdenv rebuilt without issue.

nixos-discourse · 2022-07-27T12:24:06Z

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/nix-macos-monthly/12330/31

SuperSandro2000 · 2022-08-03T13:53:19Z

Can you use sdk 11 in a nix-shell that only has stdenv.mkDerivation?

https://discourse.nixos.org/t/remove-entries-from-nix-cflags-compile/20728

PlumpMath · 2023-05-23T01:46:14Z

ipetkov/crane#325 (comment)

problem x86_64-darwin with rust

apple_sdk_11_0: make available for use on x86_64-darwin

ofborg bot added the 6.topic: darwin Running or building packages on Darwin label Jun 7, 2022

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ofborg bot added 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 0 This PR does not cause any packages to rebuild on Linux labels Jun 7, 2022

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reckenrode force-pushed the apple-sdk-11-x86_64 branch from 201416d to f10fb80 Compare June 7, 2022 05:44

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python311: 3.11.0a7 -> 3.11.0b3 #173998

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Update macOS SDK #101229

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Using MacOS SDK 11.0 on x86 #146385

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[backport release-22.05] apple_sdk_11_0: make available for use on x86_64-darwin #194145

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apple_sdk_11_0: make available for use on x86_64-darwin #176661

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reckenrode commented Jun 7, 2022

Description of changes

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