build(dep): ios target dep (#658)

clash_lib/Cargo.toml

@@ -109,7 +109,6 @@ ring-compat = { version = "0.8", features = ["aead"] }
 rand = "0.8"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-tracing-oslog = { branch = "main", git = "https://github.com/Absolucy/tracing-oslog.git" }
 tracing-appender = "0.2"
 
 shadowsocks = { version="1.21", optional = true, features=["aead-cipher-2022","stream-cipher"] }
@@ -157,6 +156,9 @@ unix-udp-sock = { git = "https://github.com/Watfaq/unix-udp-sock.git", rev = "cd
 [target.'cfg(macos)'.dependencies]
 security-framework = "3.0.1"
 
+[target.'cfg(target_os="ios")'.dependencies]
+tracing-oslog = { branch = "main", git = "https://github.com/Absolucy/tracing-oslog.git" }
+
 [target.'cfg(windows)'.dependencies]
 windows = { version = "0.58", features = [
     "Win32_Networking_WinSock",

clash_lib/src/app/logging.rs

@@ -20,6 +20,7 @@ use tokio::sync::broadcast::Sender;
 
 use tracing::debug;
 use tracing_appender::non_blocking::WorkerGuard;
+#[cfg(target_os = "ios")]
 use tracing_oslog::OsLogger;
 use tracing_subscriber::{
     filter::{self, filter_fn, Directive},
@@ -125,11 +126,11 @@ pub fn setup_logging(
         None
     };
 
-    let ios_os_log = if cfg!(target_os = "ios") {
-        Some(OsLogger::new("com.watfaq.clash", "default"))
-    } else {
-        None
-    };
+    #[cfg(target_os = "ios")]
+    let ios_os_log = Some(OsLogger::new("com.watfaq.clash", "default"));
+    #[cfg(not(target_os = "ios"))]
+    let ios_os_log =
+        tracing_subscriber::fmt::Layer::new().with_writer(std::io::empty);
 
     let (appender, g) = if let Some(log_file) = log_file {
         let file_appender = tracing_appender::rolling::daily(cwd, log_file);