stdenv: stop passing crossSystem to local stages

The dispatcher now constructs local bootstrap stages directly, so their target is represented entirely by localSystem. Remove the redundant crossSystem arguments and equality assertions from each local stage implementation.

Assisted-by: codex with gpt-5.6-sol-high

pkgs/stdenv/darwin/default.nix

@@ -10,7 +10,6 @@
 {
   lib,
   localSystem,
-  crossSystem,
   config,
   overlays,
   # Allow passing in bootstrap files directly so we can test the stdenv bootstrap process when changing the bootstrap tools
@@ -22,8 +21,6 @@
   ),
 }:
 
-assert crossSystem == localSystem;
-
 let
   inherit (localSystem) system;
   genericStdenv = import ../generic { defaultConfig = config; };

pkgs/stdenv/default.nix

@@ -16,24 +16,14 @@
 }:
 
 let
-  commonArgs = {
-    inherit
-      lib
-      localSystem
-      crossSystem
-      config
-      overlays
-      ;
-  };
-
   useCrossStdenv = crossSystem != localSystem || crossOverlays != [ ];
   useCustomStdenv = !useCrossStdenv && (config.replaceStdenv or null) != null;
 
   # Cross and custom stdenvs extend the local bootstrap stages. Keep
   # replaceStdenv out of those stages so it is applied only by the appended
   # custom stage; cross compilation uses replaceCrossStdenv instead.
-  bootArgs = commonArgs // {
-    crossSystem = if useCrossStdenv then localSystem else crossSystem;
+  bootArgs = {
+    inherit lib localSystem overlays;
     config =
       if useCrossStdenv || useCustomStdenv then removeAttrs config [ "replaceStdenv" ] else config;
   };
@@ -69,7 +59,17 @@ let
       }
       .${localSystem.system} or stagesNative;
 
-  stagesCross = import ./cross (commonArgs // { inherit crossOverlays bootStages; });
+  stagesCross = import ./cross {
+    inherit
+      lib
+      localSystem
+      crossSystem
+      config
+      overlays
+      crossOverlays
+      bootStages
+      ;
+  };
 
   replaceStdenvStage = vanillaPackages: {
     inherit config overlays;

pkgs/stdenv/freebsd/default.nix

@@ -3,7 +3,6 @@
 {
   lib,
   localSystem,
-  crossSystem,
   config,
   overlays,
   bootstrapFiles ?
@@ -18,7 +17,6 @@
     files,
 }:
 
-assert crossSystem == localSystem;
 let
   genericStdenv = import ../generic { defaultConfig = config; };
 

pkgs/stdenv/linux/default.nix

@@ -56,7 +56,6 @@
 {
   lib,
   localSystem,
-  crossSystem,
   config,
   overlays,
   bootstrapFiles ?
@@ -116,8 +115,6 @@
     (config.replaceBootstrapFiles or lib.id) files,
 }:
 
-assert crossSystem == localSystem;
-
 let
   genericStdenv = import ../generic { defaultConfig = config; };
 

pkgs/stdenv/native/default.nix

@@ -1,13 +1,10 @@
 {
   lib,
   localSystem,
-  crossSystem,
   config,
   overlays,
 }:
 
-assert crossSystem == localSystem;
-
 let
   genericStdenv = import ../generic { defaultConfig = config; };
 

pkgs/stdenv/nix/default.nix

@@ -1,13 +1,11 @@
 {
   lib,
   localSystem,
-  crossSystem,
   config,
   overlays,
   bootStages,
 }:
 
-assert crossSystem == localSystem;
 let
   genericStdenv = import ../generic { defaultConfig = config; };
 in