darwin.postLinkSignHook: drop and add to darwin-aliases.nix

The ld64 in the updated bootstrap tools is capable of code-signing, so
this hook is no longer needed.

pkgs/os-specific/darwin/signing-utils/post-link-sign-hook.nix

@@ -1,17 +0,0 @@
-{
-  writeTextFile,
-  cctools,
-  sigtool,
-}:
-
-writeTextFile {
-  name = "post-link-sign-hook";
-  executable = true;
-
-  text = ''
-    if [ "$linkerOutput" != "/dev/null" ]; then
-      CODESIGN_ALLOCATE=${cctools}/bin/${cctools.targetPrefix}codesign_allocate \
-        ${sigtool}/bin/codesign -f -s - "$linkerOutput"
-    fi
-  '';
-}

pkgs/stdenv/darwin/default.nix

@@ -647,8 +647,6 @@ assert bootstrapTools.passthru.isFromBootstrapFiles or false; # sanity check
           selfDarwin: superDarwin: {
             signingUtils = prevStage.darwin.signingUtils.override { inherit (selfDarwin) sigtool; };
 
-            postLinkSignHook = prevStage.darwin.postLinkSignHook.override { inherit (selfDarwin) sigtool; };
-
             # Rewrap binutils with the real libSystem
             binutils = superDarwin.binutils.override {
               inherit (self) coreutils;

pkgs/top-level/darwin-aliases.nix

@@ -85,4 +85,7 @@ mapAliases ({
   ### O ###
 
   opencflite = pkgs.opencflite; # added 2024-05-02
+
+  ### P ###
+  postLinkSignHook = throw "'darwin.postLinkSignHook' has been removed because it is obsolete"; # added 2025-02-23
 })

pkgs/top-level/darwin-packages.nix

@@ -192,8 +192,6 @@ makeScopeWithSplicing' {
 
       signingUtils = callPackage ../os-specific/darwin/signing-utils { };
 
-      postLinkSignHook = callPackage ../os-specific/darwin/signing-utils/post-link-sign-hook.nix { };
-
       autoSignDarwinBinariesHook = pkgs.makeSetupHook {
         name = "auto-sign-darwin-binaries-hook";
         propagatedBuildInputs = [ self.signingUtils ];