net: fix build with only process (#1575)

build-tests/Cargo.toml

@@ -11,6 +11,7 @@ net-no-features = ["tokio-net"]
 net-with-tcp = ["tokio-net/tcp"]
 net-with-udp = ["tokio-net/udp"]
 net-with-uds = ["tokio-net/uds"]
+net-with-process = ["tokio-net/process"]
 tokio-no-features = ["tokio"]
 tokio-with-net = ["tokio/net"]
 

build-tests/tests/features.rs

@@ -25,6 +25,12 @@ fn net_with_udp() {
     use build_tests::tokio_net::uds;
 }
 
+#[test]
+#[cfg(feature = "net-with-process")]
+fn net_with_process() {
+    use build_tests::tokio_net::process;
+}
+
 #[test]
 #[cfg(feature = "tokio-with-net")]
 fn tokio_with_net() {

tokio-net/Cargo.toml

@@ -23,6 +23,7 @@ categories = ["asynchronous", "network-programming"]
 [features]
 async-traits = []
 process = [
+    "tokio-io/util",
     "crossbeam-queue",
     "libc",
     "mio-named-pipes",

tokio-net/src/tracing.rs

@@ -25,7 +25,7 @@ macro_rules! trace {
 
 #[cfg(not(feature = "tracing"))]
 macro_rules! trace {
-    ($($arg:tt)+) => {};
+    ($($arg:tt)+) => {{}};
 }
 
 #[cfg(feature = "tracing")]
@@ -37,7 +37,7 @@ macro_rules! debug {
 
 #[cfg(not(feature = "tracing"))]
 macro_rules! debug {
-    ($($arg:tt)+) => {};
+    ($($arg:tt)+) => {{}};
 }
 
 #[cfg(feature = "tracing")]
@@ -49,7 +49,7 @@ macro_rules! error {
 
 #[cfg(not(feature = "tracing"))]
 macro_rules! error {
-    ($($arg:tt)+) => {};
+    ($($arg:tt)+) => {{}};
 }
 
 #[cfg(feature = "tracing")]