Rollup merge of rust-lang#30837 - semarie:openbsd-libc, r=alexcrichton

The following PR updates libc version to latest commits for correctly support openbsd.
It corrects several points in rustc to be compatible with libc changes.

r? @alexcrichton

src/libstd/rand/os.rs

@@ -222,7 +222,7 @@ mod imp {
             // getentropy(2) permits a maximum buffer size of 256 bytes
             for s in v.chunks_mut(256) {
                 let ret = unsafe {
-                    libc::syscall(libc::NR_GETENTROPY, s.as_mut_ptr(), s.len())
+                    libc::getentropy(s.as_mut_ptr() as *mut libc::c_void, s.len())
                 };
                 if ret == -1 {
                     panic!("unexpected getentropy error: {}", errno());

src/libstd/sys/unix/fs.rs

@@ -204,7 +204,8 @@ impl DirEntry {
 
     #[cfg(any(target_os = "macos",
               target_os = "ios",
-              target_os = "netbsd"))]
+              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,
@@ -213,8 +214,7 @@ impl DirEntry {
     }
     #[cfg(any(target_os = "freebsd",
               target_os = "dragonfly",
-              target_os = "bitrig",
-              target_os = "openbsd"))]
+              target_os = "bitrig"))]
     fn name_bytes(&self) -> &[u8] {
         unsafe {
             ::slice::from_raw_parts(self.entry.d_name.as_ptr() as *const u8,

src/libstd/sys/unix/stack_overflow.rs

@@ -59,19 +59,19 @@ mod imp {
     static mut PAGE_SIZE: usize = 0;
 
     #[cfg(any(target_os = "linux", target_os = "android"))]
-    unsafe fn siginfo_si_addr(info: *mut libc::siginfo_t) -> *mut libc::c_void {
+    unsafe fn siginfo_si_addr(info: *mut libc::siginfo_t) -> usize {
         #[repr(C)]
         struct siginfo_t {
             a: [libc::c_int; 3], // si_signo, si_code, si_errno,
             si_addr: *mut libc::c_void,
         }
 
-        (*(info as *const siginfo_t)).si_addr
+        (*(info as *const siginfo_t)).si_addr as usize
     }
 
     #[cfg(not(any(target_os = "linux", target_os = "android")))]
-    unsafe fn siginfo_si_addr(info: *mut libc::siginfo_t) -> *mut libc::c_void {
-        (*info).si_addr
+    unsafe fn siginfo_si_addr(info: *mut libc::siginfo_t) -> usize {
+        (*info).si_addr as usize
     }
 
     // Signal handler for the SIGSEGV and SIGBUS handlers. We've got guard pages
@@ -98,7 +98,7 @@ mod imp {
         use sys_common::util::report_overflow;
 
         let guard = thread_info::stack_guard().unwrap_or(0);
-        let addr = siginfo_si_addr(info) as usize;
+        let addr = siginfo_si_addr(info);
 
         // If the faulting address is within the guard page, then we print a
         // message saying so.

src/libtest/lib.rs

@@ -919,7 +919,6 @@ fn get_concurrency() -> usize {
     #[cfg(any(target_os = "freebsd",
               target_os = "dragonfly",
               target_os = "bitrig",
-              target_os = "openbsd",
               target_os = "netbsd"))]
     fn num_cpus() -> usize {
         let mut cpus: libc::c_uint = 0;
@@ -946,6 +945,24 @@ fn get_concurrency() -> usize {
         }
         cpus as usize
     }
+
+    #[cfg(target_os = "openbsd")]
+    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_NCPU, 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);
+        }
+        if cpus < 1 {
+            cpus = 1;
+        }
+        cpus as usize
+    }
 }
 
 pub fn filter_tests(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> Vec<TestDescAndFn> {