Tweak Travis to use GCE

Travis CI has new infrastructure using the Google Compute Engine which has both
faster CPUs and more memory, and we've been encouraged to switch as it should
help our build times! The only downside currently, however, is that IPv6 is
disabled, causing a number of standard library tests to fail.

Consequently this commit tweaks our travis config in a few ways:

* ccache is disabled as it's not working on GCE just yet
* Docker is used to run tests inside which reportedly will get IPv6 working
* A system LLVM installation is used instead of building LLVM itself. This is
  primarily done to reduce build times, but we want automation for this sort of
  behavior anyway and we can extend this in the future with building from source
  as well if needed.
* gcc-specific logic is removed as the docker image for Ubuntu gives us a
  recent-enough gcc by default.

3 files changed, 34 insertions, 21 deletions

diff --git a/src/libstd/net/udp.rs b/src/libstd/net/udp.rs
index 9e4d38e4615..0d3d15401fd 100644
--- a/src/libstd/net/udp.rs
+++ b/src/libstd/net/udp.rs
@@ -185,14 +185,13 @@ mod tests {
         }
     }
 
-    // FIXME #11530 this fails on android because tests are run as root
-    #[cfg_attr(any(windows, target_os = "android"), ignore)]
     #[test]
     fn bind_error() {
-        let addr = SocketAddrV4::new(Ipv4Addr::new(0, 0, 0, 0), 1);
-        match UdpSocket::bind(&addr) {
+        match UdpSocket::bind("1.1.1.1:9999") {
             Ok(..) => panic!(),
-            Err(e) => assert_eq!(e.kind(), ErrorKind::PermissionDenied),
+            Err(e) => {
+                assert_eq!(e.kind(), ErrorKind::AddrNotAvailable)
+            }
         }
     }
 
diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index 5f5d5a69003..0be751be950 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -625,17 +625,20 @@ mod tests {
         drop(p.wait());
     }
 
+    #[cfg(unix)]
     #[cfg(all(unix, not(target_os="android")))]
-    #[test]
     fn signal_reported_right() {
         use os::unix::process::ExitStatusExt;
 
-        let p = Command::new("/bin/sh").arg("-c").arg("kill -9 $$").spawn();
-        assert!(p.is_ok());
-        let mut p = p.unwrap();
+        let mut p = Command::new("/bin/sh")
+                            .arg("-c").arg("read a")
+                            .stdin(Stdio::piped())
+                            .spawn().unwrap();
+        p.kill().unwrap();
         match p.wait().unwrap().signal() {
             Some(9) => {},
-            result => panic!("not terminated by signal 9 (instead, {:?})", result),
+            result => panic!("not terminated by signal 9 (instead, {:?})",
+                             result),
         }
     }
 
diff --git a/src/libstd/sys/unix/process.rs b/src/libstd/sys/unix/process.rs
index ce6e5609ce7..7f50e75f6fc 100644
--- a/src/libstd/sys/unix/process.rs
+++ b/src/libstd/sys/unix/process.rs
@@ -450,6 +450,15 @@ mod tests {
     use slice;
     use sys::{self, c, cvt, pipe};
 
+    macro_rules! t {
+        ($e:expr) => {
+            match $e {
+                Ok(t) => t,
+                Err(e) => panic!("received error for `{}`: {}", stringify!($e), e),
+            }
+        }
+    }
+
     #[cfg(not(target_os = "android"))]
     extern {
         #[cfg_attr(target_os = "netbsd", link_name = "__sigaddset14")]
@@ -473,24 +482,26 @@ mod tests {
         unsafe {
             // Test to make sure that a signal mask does not get inherited.
             let cmd = Command::new(OsStr::new("cat"));
-            let (stdin_read, stdin_write) = sys::pipe::anon_pipe().unwrap();
-            let (stdout_read, stdout_write) = sys::pipe::anon_pipe().unwrap();
+            let (stdin_read, stdin_write) = t!(sys::pipe::anon_pipe());
+            let (stdout_read, stdout_write) = t!(sys::pipe::anon_pipe());
 
             let mut set: c::sigset_t = mem::uninitialized();
             let mut old_set: c::sigset_t = mem::uninitialized();
-            cvt(c::sigemptyset(&mut set)).unwrap();
-            cvt(sigaddset(&mut set, libc::SIGINT)).unwrap();
-            cvt(c::pthread_sigmask(c::SIG_SETMASK, &set, &mut old_set)).unwrap();
+            t!(cvt(c::sigemptyset(&mut set)));
+            t!(cvt(sigaddset(&mut set, libc::SIGINT)));
+            t!(cvt(c::pthread_sigmask(c::SIG_SETMASK, &set, &mut old_set)));
 
-            let cat = Process::spawn(&cmd, Stdio::Raw(stdin_read.raw()),
-                                           Stdio::Raw(stdout_write.raw()),
-                                           Stdio::None).unwrap();
+            let cat = t!(Process::spawn(&cmd, Stdio::Raw(stdin_read.raw()),
+                                              Stdio::Raw(stdout_write.raw()),
+                                              Stdio::None));
             drop(stdin_read);
             drop(stdout_write);
 
-            cvt(c::pthread_sigmask(c::SIG_SETMASK, &old_set, ptr::null_mut())).unwrap();
+            t!(cvt(c::pthread_sigmask(c::SIG_SETMASK, &old_set,
+                                      ptr::null_mut())));
 
-            cvt(libc::funcs::posix88::signal::kill(cat.id() as libc::pid_t, libc::SIGINT)).unwrap();
+            t!(cvt(libc::funcs::posix88::signal::kill(cat.id() as libc::pid_t,
+                                                      libc::SIGINT)));
             // We need to wait until SIGINT is definitely delivered. The
             // easiest way is to write something to cat, and try to read it
             // back: if SIGINT is unmasked, it'll get delivered when cat is
@@ -504,7 +515,7 @@ mod tests {
                 assert!(ret == 0);
             }
 
-            cat.wait().unwrap();
+            t!(cat.wait());
         }
     }
 }