diff --git a/src/liblibc b/src/liblibc
index af77843345ec6..f9073f462b8b4 160000
--- a/src/liblibc
+++ b/src/liblibc
@@ -1 +1 @@
-Subproject commit af77843345ec6fc7e51113bfd692138d89024bc0
+Subproject commit f9073f462b8b41495dafba6eb5f8b21b38e7d29a
diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index d2d2ce35d84a0..9193181123462 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -211,20 +211,14 @@ impl DirEntry {
     #[cfg(any(target_os = "macos",
               target_os = "ios",
               target_os = "netbsd",
-              target_os = "openbsd"))]
-    fn name_bytes(&self) -> &[u8] {
-        unsafe {
-            ::slice::from_raw_parts(self.entry.d_name.as_ptr() as *const u8,
-                                    self.entry.d_namlen as usize)
-        }
-    }
-    #[cfg(any(target_os = "freebsd",
+              target_os = "openbsd",
+              target_os = "freebsd",
               target_os = "dragonfly",
               target_os = "bitrig"))]
     fn name_bytes(&self) -> &[u8] {
         unsafe {
             ::slice::from_raw_parts(self.entry.d_name.as_ptr() as *const u8,
-                                    self.entry.d_namelen as usize)
+                                    self.entry.d_namlen as usize)
         }
     }
     #[cfg(any(target_os = "android",
diff --git a/src/libstd/sys/unix/stack_overflow.rs b/src/libstd/sys/unix/stack_overflow.rs
index fc49f4257be2a..87a4b8a8d3b42 100644
--- a/src/libstd/sys/unix/stack_overflow.rs
+++ b/src/libstd/sys/unix/stack_overflow.rs
@@ -134,17 +134,42 @@ mod imp {
         Handler { _data: MAIN_ALTSTACK };
     }
 
-    pub unsafe fn make_handler() -> Handler {
-        let alt_stack = mmap(ptr::null_mut(),
-                             SIGSTKSZ,
-                             PROT_READ | PROT_WRITE,
-                             MAP_PRIVATE | MAP_ANON,
-                             -1,
-                             0);
-        if alt_stack == MAP_FAILED {
+    #[cfg(any(target_os = "linux",
+              target_os = "macos",
+              target_os = "bitrig",
+              target_os = "netbsd",
+              target_os = "openbsd"))]
+    unsafe fn get_stack() -> *mut libc::c_void {
+        let stack = mmap(ptr::null_mut(),
+                         SIGSTKSZ,
+                         PROT_READ | PROT_WRITE,
+                         MAP_PRIVATE | MAP_ANON,
+                         -1,
+                         0);
+        if stack == MAP_FAILED {
+            panic!("failed to allocate an alternative stack");
+        }
+        stack
+    }
+
+    #[cfg(any(target_os = "dragonfly",
+              target_os = "freebsd"))]
+    unsafe fn get_stack() -> *mut i8 {
+        let stack = mmap(ptr::null_mut(),
+                         SIGSTKSZ,
+                         PROT_READ | PROT_WRITE,
+                         MAP_PRIVATE | MAP_ANON,
+                         -1,
+                         0);
+        if stack == MAP_FAILED {
             panic!("failed to allocate an alternative stack");
         }
+        stack as *mut i8
+    }
 
+
+    pub unsafe fn make_handler() -> Handler {
+        let alt_stack = get_stack();
         let mut stack: libc::stack_t = mem::zeroed();
 
         stack.ss_sp = alt_stack;
@@ -153,7 +178,7 @@ mod imp {
 
         sigaltstack(&stack, ptr::null_mut());
 
-        Handler { _data: alt_stack }
+        Handler { _data: alt_stack as *mut libc::c_void }
     }
 
     pub unsafe fn drop_handler(handler: &mut Handler) {
diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index ac5b235854a04..555e66d46e680 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -938,18 +938,12 @@ fn get_concurrency() -> usize {
     fn num_cpus() -> usize {
         let mut cpus: libc::c_uint = 0;
         let mut cpus_size = std::mem::size_of_val(&cpus);
-        let mut mib = [libc::CTL_HW, libc::HW_AVAILCPU, 0, 0];
 
         unsafe {
-            libc::sysctl(mib.as_mut_ptr(),
-                         2,
-                         &mut cpus as *mut _ as *mut _,
-                         &mut cpus_size as *mut _ as *mut _,
-                         0 as *mut _,
-                         0);
+            cpus = libc::sysconf(libc::_SC_NPROCESSORS_ONLN) as libc::c_uint;
         }
         if cpus < 1 {
-            mib[1] = libc::HW_NCPU;
+            let mut mib = [libc::CTL_HW, libc::HW_NCPU, 0, 0];
             unsafe {
                 libc::sysctl(mib.as_mut_ptr(),
                              2,