quinn: add proper guards to Endpoint constructor helpers

bench/Cargo.toml

@@ -9,7 +9,7 @@ publish = false
 anyhow = "1.0.22"
 bytes = "1"
 hdrhistogram = { version = "7.2", default-features = false }
-quinn = { path = "../quinn" }
+quinn = { path = "../quinn", features = ["ring"] }
 rcgen = "0.13"
 rustls = { version = "0.23", default-features = false, features = ["ring", "std"] }
 clap = { version = "4", features = ["derive"] }

quinn/src/endpoint.rs

@@ -12,8 +12,10 @@ use std::{
     time::Instant,
 };
 
+#[cfg(feature = "ring")]
+use crate::runtime::default_runtime;
 use crate::{
-    runtime::{default_runtime, AsyncUdpSocket, Runtime},
+    runtime::{AsyncUdpSocket, Runtime},
     udp_transmit,
 };
 use bytes::{Bytes, BytesMut};
@@ -56,6 +58,7 @@ impl Endpoint {
     /// IPv6 address on Windows will not by default be able to communicate with IPv4
     /// addresses. Portable applications should bind an address that matches the family they wish to
     /// communicate within.
+    #[cfg(feature = "ring")]
     pub fn client(addr: SocketAddr) -> io::Result<Self> {
         let socket = std::net::UdpSocket::bind(addr)?;
         let runtime = default_runtime()
@@ -74,6 +77,7 @@ impl Endpoint {
     /// IPv6 address on Windows will not by default be able to communicate with IPv4
     /// addresses. Portable applications should bind an address that matches the family they wish to
     /// communicate within.
+    #[cfg(feature = "ring")]
     pub fn server(config: ServerConfig, addr: SocketAddr) -> io::Result<Self> {
         let socket = std::net::UdpSocket::bind(addr)?;
         let runtime = default_runtime()