Enforce some lints.

examples/ping.rs

@@ -8,7 +8,6 @@ extern crate byteorder;
 mod utils;
 
 use std::str::{self, FromStr};
-use std::cmp;
 use std::time::Instant;
 use std::os::unix::io::AsRawFd;
 use smoltcp::phy::wait as phy_wait;

src/iface/ethernet.rs

@@ -274,7 +274,7 @@ impl<'a, 'b, 'c, DeviceT: Device + 'a> Interface<'a, 'b, 'c, DeviceT> {
     }
 
     fn process_ipv4<'frame, T: AsRef<[u8]>>
-                   (&mut self, sockets: &mut SocketSet, timestamp: u64,
+                   (&mut self, sockets: &mut SocketSet, _timestamp: u64,
                     eth_frame: &EthernetFrame<&'frame T>) ->
                    Result<Packet<'frame>> {
         let ipv4_packet = Ipv4Packet::new_checked(eth_frame.payload())?;
@@ -329,7 +329,7 @@ impl<'a, 'b, 'c, DeviceT: Device + 'a> Interface<'a, 'b, 'c, DeviceT> {
 
             #[cfg(feature = "socket-tcp")]
             IpProtocol::Tcp =>
-                Self::process_tcp(sockets, timestamp, ip_repr, ip_payload),
+                Self::process_tcp(sockets, _timestamp, ip_repr, ip_payload),
 
             #[cfg(feature = "socket-raw")]
             _ if handled_by_raw_socket =>

src/lib.rs

@@ -1,5 +1,6 @@
 #![cfg_attr(feature = "alloc", feature(alloc))]
 #![no_std]
+#![deny(unsafe_code, unused)]
 
 //! The _smoltcp_ library is built in a layered structure, with the layers corresponding
 //! to the levels of API abstraction. Only the highest layers would be used by a typical
@@ -67,6 +68,12 @@
 //! feature ever defined, to ensure that, when the representation layer is unable to make sense
 //! of a packet, it is still logged correctly and in full.
 
+/* XXX compiler bug
+#![cfg(not(any(feature = "socket-raw",
+               feature = "socket-udp",
+               feature = "socket-tcp")))]
+compile_error!("at least one socket needs to be enabled"); */
+
 extern crate byteorder;
 extern crate managed;
 #[cfg(any(test, feature = "std"))]

src/phy/sys/mod.rs

@@ -1,3 +1,5 @@
+#![allow(unsafe_code)]
+
 use libc;
 use std::{mem, ptr, io};
 use std::os::unix::io::RawFd;