top-level: `stdenv.cross` is now only defined with host != build

In practice, this is a strictly stronger condition than target != build
as we never have build = target != host. Really, the attribute should
be removed altogether, but for now we make it work for plain libraries,
which do not care about the target platform. In the few cases where the
compilers use this and actually care about the target platform, I'll
manually change them to use `targetPlatform` instead.

1 files changed, 2 insertions, 2 deletions

diff --git a/pkgs/top-level/stage.nix b/pkgs/top-level/stage.nix
index d8e190cfd4be..f6e7f41ed883 100644
--- a/pkgs/top-level/stage.nix
+++ b/pkgs/top-level/stage.nix
@@ -110,8 +110,8 @@ let
   in {
     stdenv = super.stdenv // {
       inherit (buildPlatform) platform;
-    } // lib.optionalAttrs (targetPlatform != buildPlatform) {
-      cross = targetPlatform;
+    } // lib.optionalAttrs (hostPlatform != buildPlatform) {
+      cross = hostPlatform;
     };
     inherit (buildPlatform) system platform;
   };