clipcat: fix build (#437042)

pkgs/by-name/cl/clipcat/dummy.patch

@@ -0,0 +1,14 @@
+diff --git a/crates/server/src/notification/dummy.rs b/crates/server/src/notification/dummy.rs
+index f85dda0..7489f22 100644
+--- a/crates/server/src/notification/dummy.rs
++++ b/crates/server/src/notification/dummy.rs
+@@ -1,6 +1,9 @@
++#[cfg(test)]
+ use crate::notification::traits;
+ 
++#[cfg(test)]
+ #[derive(Clone, Copy, Debug, Default)]
+ pub struct Notification {}
+ 
++#[cfg(test)]
+ impl traits::Notification for Notification {}

pkgs/by-name/cl/clipcat/package.nix

@@ -5,6 +5,7 @@
   rustPlatform,
   protobuf,
   installShellFiles,
+  writableTmpDirAsHomeHook,
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -20,9 +21,20 @@ rustPlatform.buildRustPackage rec {
 
   cargoHash = "sha256-UA+NTtZ2qffUPUmvCidnTHwFzD3WOPTlxHR2e2vKwPQ=";
 
+  patches = [
+    # Fix compilation errors caused by stricter restrictions on unused code in Rust 1.89.
+    # TODO: remove this patch after upstream fix it.
+    ./dummy.patch
+  ];
+
   nativeBuildInputs = [
     protobuf
     installShellFiles
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    # fix following error on darwin:
+    # objc/notify.h:1:9: fatal error: could not build module 'Cocoa'
+    writableTmpDirAsHomeHook
   ];
 
   checkFlags = [