From be7e45f6f5f4fb372ebe8dfab7533500cf3e254c Mon Sep 17 00:00:00 2001
From: Jon Gjengset <jon@thesquareplanet.com>
Date: Wed, 3 May 2017 15:57:29 -0400
Subject: [PATCH] Skip res_init test on macOS/iOS

---
 libc-test/build.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libc-test/build.rs b/libc-test/build.rs
index 57767f55ea5a3..2f59a442af184 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -469,10 +469,16 @@ fn main() {
             // it's in a header file?
             "endpwent" if android => true,
 
-            // Apparently it exists, but isn't defined in a header:
+            // Apparently res_init exists on Android, but isn't defined in a header:
             // https://mail.gnome.org/archives/commits-list/2013-May/msg01329.html
             "res_init" if android => true,
 
+            // On macOS and iOS, res_init is available, but requires linking with libresolv:
+            // http://blog.achernya.com/2013/03/os-x-has-silly-libsystem.html
+            // See discussion for skipping here:
+            // https://github.com/rust-lang/libc/pull/585#discussion_r114561460
+            "res_init" if apple => true,
+
             _ => false,
         }
     });