diff --git a/src/libcore/tests/hash/sip.rs b/src/libcore/tests/hash/sip.rs
index 4a9657e0340..c6dd41798f2 100644
--- a/src/libcore/tests/hash/sip.rs
+++ b/src/libcore/tests/hash/sip.rs
@@ -243,24 +243,22 @@ fn test_siphash_2_4() {
         t += 1;
     }
 }
-#[test] #[cfg(target_arch = "arm")]
+
+#[test]
+#[cfg(target_pointer_width = "32")]
 fn test_hash_usize() {
     let val = 0xdeadbeef_deadbeef_u64;
     assert!(hash(&(val as u64)) != hash(&(val as usize)));
     assert_eq!(hash(&(val as u32)), hash(&(val as usize)));
 }
-#[test] #[cfg(target_arch = "x86_64")]
+
+#[test]
+#[cfg(target_pointer_width = "64")]
 fn test_hash_usize() {
     let val = 0xdeadbeef_deadbeef_u64;
     assert_eq!(hash(&(val as u64)), hash(&(val as usize)));
     assert!(hash(&(val as u32)) != hash(&(val as usize)));
 }
-#[test] #[cfg(target_arch = "x86")]
-fn test_hash_usize() {
-    let val = 0xdeadbeef_deadbeef_u64;
-    assert!(hash(&(val as u64)) != hash(&(val as usize)));
-    assert_eq!(hash(&(val as u32)), hash(&(val as usize)));
-}
 
 #[test]
 fn test_hash_idempotent() {
diff --git a/src/liblibc b/src/liblibc
index 44e4018e1a3..7e33065ce49 160000
--- a/src/liblibc
+++ b/src/liblibc
@@ -1 +1 @@
-Subproject commit 44e4018e1a37716286ec98cb5b7dd7d33ecaf940
+Subproject commit 7e33065ce49759958c0d1c04fcadef961032a943
diff --git a/src/libstd/sys/unix/condvar.rs b/src/libstd/sys/unix/condvar.rs
index 89a44b97657..4f878d8ad1f 100644
--- a/src/libstd/sys/unix/condvar.rs
+++ b/src/libstd/sys/unix/condvar.rs
@@ -92,14 +92,15 @@ impl Condvar {
         assert_eq!(r, 0);
 
         // Nanosecond calculations can't overflow because both values are below 1e9.
-        let nsec = dur.subsec_nanos() as libc::c_long + now.tv_nsec as libc::c_long;
+        let nsec = dur.subsec_nanos() + now.tv_nsec as u32;
+
         let sec = saturating_cast_to_time_t(dur.as_secs())
             .checked_add((nsec / 1_000_000_000) as libc::time_t)
             .and_then(|s| s.checked_add(now.tv_sec));
         let nsec = nsec % 1_000_000_000;
 
         let timeout = sec.map(|s| {
-            libc::timespec { tv_sec: s, tv_nsec: nsec }
+            libc::timespec { tv_sec: s, tv_nsec: nsec as _}
         }).unwrap_or(TIMESPEC_MAX);
 
         let r = libc::pthread_cond_timedwait(self.inner.get(), mutex::raw(mutex),
diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index c4616c3b395..a1ca839dc18 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -132,14 +132,14 @@ impl FileAttr {
     pub fn modified(&self) -> io::Result<SystemTime> {
         Ok(SystemTime::from(libc::timespec {
             tv_sec: self.stat.st_mtime as libc::time_t,
-            tv_nsec: self.stat.st_mtime_nsec as libc::c_long,
+            tv_nsec: self.stat.st_mtime_nsec as _,
         }))
     }
 
     pub fn accessed(&self) -> io::Result<SystemTime> {
         Ok(SystemTime::from(libc::timespec {
             tv_sec: self.stat.st_atime as libc::time_t,
-            tv_nsec: self.stat.st_atime_nsec as libc::c_long,
+            tv_nsec: self.stat.st_atime_nsec as _,
         }))
     }
 
diff --git a/src/libstd/sys/unix/thread.rs b/src/libstd/sys/unix/thread.rs
index 6c4a3324296..cc889454ce9 100644
--- a/src/libstd/sys/unix/thread.rs
+++ b/src/libstd/sys/unix/thread.rs
@@ -149,7 +149,7 @@ impl Thread {
 
     pub fn sleep(dur: Duration) {
         let mut secs = dur.as_secs();
-        let mut nsecs = dur.subsec_nanos() as libc::c_long;
+        let mut nsecs = dur.subsec_nanos() as _;
 
         // If we're awoken with a signal then the return value will be -1 and
         // nanosleep will fill in `ts` with the remaining time.
diff --git a/src/libstd/sys/unix/time.rs b/src/libstd/sys/unix/time.rs
index c1bea95ce91..837cd7292e2 100644
--- a/src/libstd/sys/unix/time.rs
+++ b/src/libstd/sys/unix/time.rs
@@ -60,7 +60,7 @@ impl Timespec {
         Timespec {
             t: libc::timespec {
                 tv_sec: secs,
-                tv_nsec: nsec as libc::c_long,
+                tv_nsec: nsec as _,
             },
         }
     }
@@ -83,7 +83,7 @@ impl Timespec {
         Timespec {
             t: libc::timespec {
                 tv_sec: secs,
-                tv_nsec: nsec as libc::c_long,
+                tv_nsec: nsec as _,
             },
         }
     }
diff --git a/src/test/codegen/issue-37945.rs b/src/test/codegen/issue-37945.rs
index e7c91f30918..df02426badc 100644
--- a/src/test/codegen/issue-37945.rs
+++ b/src/test/codegen/issue-37945.rs
@@ -13,6 +13,7 @@
 // ignore-x86
 // ignore-arm
 // ignore-emscripten
+// ignore-gnux32
 // ignore 32-bit platforms (LLVM has a bug with them)
 
 // See issue #37945.
diff --git a/src/tools/compiletest/src/util.rs b/src/tools/compiletest/src/util.rs
index 85fa38bbd3b..bd4044b4df3 100644
--- a/src/tools/compiletest/src/util.rs
+++ b/src/tools/compiletest/src/util.rs
@@ -73,7 +73,7 @@ pub fn get_env(triple: &str) -> Option<&str> {
 }
 
 pub fn get_pointer_width(triple: &str) -> &'static str {
-    if triple.contains("64") || triple.starts_with("s390x") {
+    if (triple.contains("64") && !triple.ends_with("gnux32")) || triple.starts_with("s390x") {
         "64bit"
     } else {
         "32bit"