Auto merge of #2717 - vladimir-ea:watchos, r=Amanieu

Add support for Apple WatchOS

Hi, I am hoping to add Apple WatchOS compile targets and these are prerequisite changes.

Many thanks!
Vlad.

Author: bors

src/unix/bsd/apple/mod.rs

@@ -1172,9 +1172,9 @@ s_no_extra_traits! {
         pub ifi_noproto: u64,
         pub ifi_recvtiming: u32,
         pub ifi_xmittiming: u32,
-        #[cfg(any(target_arch = "arm", target_arch = "x86"))]
+        #[cfg(target_pointer_width = "32")]
         pub ifi_lastchange: ::timeval,
-        #[cfg(not(any(target_arch = "arm", target_arch = "x86")))]
+        #[cfg(not(target_pointer_width = "32"))]
         pub ifi_lastchange: timeval32,
     }
 
@@ -5522,10 +5522,10 @@ extern "C" {
 }
 
 cfg_if! {
-    if #[cfg(any(target_arch = "arm", target_arch = "x86"))] {
+    if #[cfg(target_pointer_width = "32")] {
         mod b32;
         pub use self::b32::*;
-    } else if #[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))] {
+    } else if #[cfg(target_pointer_width = "64")] {
         mod b64;
         pub use self::b64::*;
     } else {

src/unix/bsd/mod.rs

@@ -37,6 +37,7 @@ s! {
 
         #[cfg(not(any(target_os = "macos",
                       target_os = "ios",
+                      target_os = "watchos",
                       target_os = "netbsd",
                       target_os = "openbsd")))]
         pub pw_fields: ::c_int,
@@ -880,7 +881,7 @@ extern "C" {
 }
 
 cfg_if! {
-    if #[cfg(any(target_os = "macos", target_os = "ios"))] {
+    if #[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))] {
         mod apple;
         pub use self::apple::*;
     } else if #[cfg(any(target_os = "openbsd", target_os = "netbsd"))] {

src/unix/mod.rs

@@ -356,6 +356,7 @@ cfg_if! {
         extern {}
     } else if #[cfg(any(target_os = "macos",
                         target_os = "ios",
+                        target_os = "watchos",
                         target_os = "android",
                         target_os = "openbsd"))] {
         #[link(name = "c")]
@@ -1025,7 +1026,7 @@ extern "C" {
     pub fn getrusage(resource: ::c_int, usage: *mut rusage) -> ::c_int;
 
     #[cfg_attr(
-        any(target_os = "macos", target_os = "ios"),
+        any(target_os = "macos", target_os = "ios", target_os = "watchos"),
         link_name = "realpath$DARWIN_EXTSN"
     )]
     pub fn realpath(pathname: *const ::c_char, resolved: *mut ::c_char) -> *mut ::c_char;
@@ -1191,7 +1192,10 @@ extern "C" {
         ),
         link_name = "__res_init"
     )]
-    #[cfg_attr(any(target_os = "macos", target_os = "ios"), link_name = "res_9_init")]
+    #[cfg_attr(
+        any(target_os = "macos", target_os = "ios", target_os = "watchos"),
+        link_name = "res_9_init"
+    )]
     pub fn res_init() -> ::c_int;
 
     #[cfg_attr(target_os = "netbsd", link_name = "__gmtime_r50")]
@@ -1464,6 +1468,7 @@ cfg_if! {
         pub use self::linux_like::*;
     } else if #[cfg(any(target_os = "macos",
                         target_os = "ios",
+                        target_os = "watchos",
                         target_os = "freebsd",
                         target_os = "dragonfly",
                         target_os = "openbsd",