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pkgs/top-level: fix composing "native cross" package sets

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When using pkgsCross with a system that ends up the same as the
localSystem, then modifications for package sets like pksgMusl need to
be done for **both** localSystem and crossSystem. Consider the following
on x86_64-linux:

  pkgsCross.gnu64.pkgsMusl

Before this change, this would result in a musl buildPlatform, but a gnu
hostPlatform. This breaks the promise of "stacking" package sets on top
of each other.

After this change, it results in a musl buildPlatform and a musl
hostPlatform. This works better.

One could expect this to result in the same as pkgsCross.musl64, i.e. a
gnu buildPlatform and a musl hostPlatform, however I couldn't get this
to work without increasing memory usage for ci/eval by many, many GB.
This is caused by usage of pkgsi686Linux inside the main package set,
which follows the same hybrid pattern.
This commit is contained in:
Wolfgang Walther 2024-12-21 16:42:40 +01:00
parent 69775e2deb
commit 2acca93bef
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GPG key ID: B39893FA5F65CAE1
2 changed files with 9 additions and 7 deletions
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5
pkgs/test/top-level/stage.nix
View file

@ -110,9 +110,8 @@ assert isComposable "pkgsStatic";
assert isComposable "pkgsi686Linux";
# Special cases regarding buildPlatform vs hostPlatform
# TODO: fails
# assert discardEvaluationErrors (pkgsCross.gnu64.pkgsMusl.stdenv.hostPlatform.isMusl);
# assert discardEvaluationErrors (pkgsCross.gnu64.pkgsi686Linux.stdenv.hostPlatform.isx86_32);
assert discardEvaluationErrors (pkgsCross.gnu64.pkgsMusl.stdenv.hostPlatform.isMusl);
assert discardEvaluationErrors (pkgsCross.gnu64.pkgsi686Linux.stdenv.hostPlatform.isx86_32);
assert discardEvaluationErrors (pkgsCross.mingwW64.pkgsLinux.stdenv.hostPlatform.isLinux);
assert discardEvaluationErrors (
pkgsCross.aarch64-darwin.pkgsx86_64Darwin.stdenv.hostPlatform.isx86_64

11
pkgs/top-level/stage.nix
View file

@ -195,10 +195,13 @@ let
(lib.systems.systemToAttrs (lib.defaultTo prevArgs.localSystem prevArgs.crossSystem or null)) // crossAttrs;
});
# This is only cross when we are already cross, otherwise local.
mkHybridPkgs = name: hybridAttrs: mkPkgs name (prevArgs: {
${if stdenv.hostPlatform == stdenv.buildPlatform then "localSystem" else "crossSystem"} =
(lib.systems.systemToAttrs (lib.defaultTo prevArgs.localSystem prevArgs.crossSystem or null)) // hybridAttrs;
});
# For the case of "native cross", i.e. pkgsCross.gnu64 on a x86_64-linux system, we need to adjust **both**
# localSystem **and** crossSystem, otherwise they're out of sync.
mkHybridPkgs = name: hybridAttrs: mkPkgs name (prevArgs: let
newSystem = (lib.systems.systemToAttrs (lib.defaultTo prevArgs.localSystem prevArgs.crossSystem or null)) // hybridAttrs;
in { crossSystem = newSystem; }
// lib.optionalAttrs (stdenv.hostPlatform == stdenv.buildPlatform) { localSystem = newSystem; }
);
in self: super: {
# This maps each entry in lib.systems.examples to its own package
# set. Each of these will contain all packages cross compiled for