darwin.apple_sdk_11_0: use stdenv objc4

Stdenv on aarch64-darwin pulls in (bootstrap-stage4) objc4, unlike
x86_64. However derivations that otherwise depend on objc4 would use a
a different objc4 derivation on top of the final stdenv.

Because this library defines an LLVM module, having multiple instances
of it in the import path will interfere with builds.

1 files changed, 5 insertions, 0 deletions

diff --git a/pkgs/stdenv/darwin/default.nix b/pkgs/stdenv/darwin/default.nix
index ff56f1de0226..9a7cd9aa9dee 100644
--- a/pkgs/stdenv/darwin/default.nix
+++ b/pkgs/stdenv/darwin/default.nix
@@ -698,6 +698,11 @@ rec {
         libc = pkgs.darwin.Libsystem;
         shellPackage = pkgs.bash;
         inherit bootstrapTools;
+      } // lib.optionalAttrs useAppleSDKLibs {
+        # This objc4 will be propagated to all builds using the final stdenv,
+        # and we shouldn't mix different builds, because they would be
+        # conflicting LLVM modules. Export it here so we can grab it later.
+        inherit (pkgs.darwin) objc4;
       };
 
       allowedRequisites = (with pkgs; [