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nix: override apple-sdk to 26.2 and enable MLX_BUILD_CPU (#1443)

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The pinned nixpkgs provides apple-sdk 26.0, but building MLX requires
SDK 26.2. The upstream package reads versions.json via a relative path
at eval time, so it can't be overridden through callPackage args.

Added a thin overlay that copies the upstream apple-sdk source and
patches only metadata/versions.json to point at SDK 26.2. Also enabled
MLX_BUILD_CPU in the MLX nix build.

This avoids vendoring the entire apple-sdk package (~2200 lines) while
still getting the SDK version we need.

Test plan:
- CI
- Built and ran on two machines connected with Thunderbolt 5 - Kimi K2.5
starts in Tensor+RDMA and seems sensible.
This commit is contained in:
Jake Hillion
2026-02-10 19:53:53 +00:00
committed by GitHub
parent 43728b2047
commit 8af2af6328
4 changed files with 48 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
flake.nix
+3
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@@ -83,6 +83,9 @@
_module.args.pkgs = import inputs.nixpkgs {
inherit system;
config.allowUnfreePredicate = pkg: (pkg.pname or "") == "metal-toolchain";
overlays = [
(import ./nix/apple-sdk-overlay.nix)
];
};
treefmt = {
projectRootFile = "flake.nix";
nix/apple-sdk-overlay.nix
+18
View File
@@ -0,0 +1,18 @@
# Overlay that builds apple-sdk with a custom versions.json (for SDK 26.2).
# The upstream nixpkgs package reads versions.json at eval time via a relative
# path, so we can't override it through callPackage args. Instead, we copy
# the upstream source and patch the one file.
final: _prev:
let
upstreamSrc = final.path + "/pkgs/by-name/ap/apple-sdk";
patchedSrc = final.runCommandLocal "apple-sdk-src-patched" { } ''
cp -r ${upstreamSrc} $out
chmod -R u+w $out
cp ${./apple-sdk/metadata/versions.json} $out/metadata/versions.json
'';
in
{
apple-sdk_26 = final.callPackage (patchedSrc + "/package.nix") {
darwinSdkMajorVersion = "26";
};
}
nix/apple-sdk/metadata/versions.json
+26
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@@ -0,0 +1,26 @@
{
"14": {
"urls": [
"https://swcdn.apple.com/content/downloads/14/48/052-59890-A_I0F5YGAY0Y/p9n40hio7892gou31o1v031ng6fnm9sb3c/CLTools_macOSNMOS_SDK.pkg",
"https://web.archive.org/web/20250211001355/https://swcdn.apple.com/content/downloads/14/48/052-59890-A_I0F5YGAY0Y/p9n40hio7892gou31o1v031ng6fnm9sb3c/CLTools_macOSNMOS_SDK.pkg"
],
"version": "14.4",
"hash": "sha256-QozDiwY0Czc0g45vPD7G4v4Ra+3DujCJbSads3fJjjM="
},
"15": {
"urls": [
"https://swcdn.apple.com/content/downloads/52/01/082-41241-A_0747ZN8FHV/dectd075r63pppkkzsb75qk61s0lfee22j/CLTools_macOSNMOS_SDK.pkg",
"https://web.archive.org/web/20250530132510/https://swcdn.apple.com/content/downloads/52/01/082-41241-A_0747ZN8FHV/dectd075r63pppkkzsb75qk61s0lfee22j/CLTools_macOSNMOS_SDK.pkg"
],
"version": "15.5",
"hash": "sha256-HBiSJuw1XBUK5R/8Sj65c3rftSEvQl/O9ZZVp/g1Amo="
},
"26": {
"urls": [
"https://swcdn.apple.com/content/downloads/60/22/089-71960-A_W8BL1RUJJ6/5zkyplomhk1cm7z6xja2ktgapnhhti6wwd/CLTools_macOSNMOS_SDK.pkg",
"https://web.archive.org/web/20250915230423/https://swcdn.apple.com/content/downloads/60/22/089-71960-A_W8BL1RUJJ6/5zkyplomhk1cm7z6xja2ktgapnhhti6wwd/CLTools_macOSNMOS_SDK.pkg"
],
"version": "26.2",
"hash": "sha256-hXRlMieVv0smna5uiWRwq87IWOaPWtAjAldbi+wQXcw="
}
}
nix/mlx.nix
+1
View File
@@ -85,6 +85,7 @@ let
(lib.cmakeOptionType "filepath" "FETCHCONTENT_SOURCE_DIR_JSON" "${nlohmann_json.src}")
(lib.cmakeOptionType "filepath" "FETCHCONTENT_SOURCE_DIR_NANOBIND" "${nanobind}")
(lib.cmakeBool "FETCHCONTENT_FULLY_DISCONNECTED" true)
(lib.cmakeBool "MLX_BUILD_CPU" true)
(lib.cmakeBool "MLX_BUILD_METAL" true)
(lib.cmakeOptionType "filepath" "FETCHCONTENT_SOURCE_DIR_METAL_CPP" "${metal_cpp}")
(lib.cmakeOptionType "string" "CMAKE_OSX_DEPLOYMENT_TARGET" "${apple-sdk_26.version}")