Add IN6ADDR_ANY_INIT, IN6ADDR_LOOPBACK_INIT, in6addr_any, in6addr_loo…

…pback

(backport <rust-lang#3693>)
[ move constants to the align module to support old rustc - Trevor ]
(cherry picked from commit 8db9bc7)

src/unix/align.rs

@@ -0,0 +1,14 @@
+s! {
+    #[repr(align(4))]
+    pub struct in6_addr {
+        pub s6_addr: [u8; 16],
+    }
+}
+
+pub const IN6ADDR_LOOPBACK_INIT: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
+};
+
+pub const IN6ADDR_ANY_INIT: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+};

src/unix/mod.rs

@@ -338,6 +338,11 @@ pub const ATF_USETRAILERS: c_int = 0x10;
 pub const FNM_PERIOD: c_int = 1 << 2;
 pub const FNM_NOMATCH: c_int = 1;
 
+extern "C" {
+    pub static in6addr_loopback: in6_addr;
+    pub static in6addr_any: in6_addr;
+}
+
 cfg_if! {
     if #[cfg(any(target_os = "illumos", target_os = "solaris",))] {
         pub const FNM_CASEFOLD: c_int = 1 << 3;

src/unix/no_align.rs

@@ -0,0 +1,16 @@
+s! {
+    pub struct in6_addr {
+        pub s6_addr: [u8; 16],
+        __align: [u32; 0],
+    }
+}
+
+pub const IN6ADDR_LOOPBACK_INIT: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
+    __align: [0u32; 0],
+};
+
+pub const IN6ADDR_ANY_INIT: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+    __align: [0u32; 0],
+};