Pull extra dep

Author: Minoru

src/unix/mod.rs

@@ -297,8 +297,11 @@ cfg_if! {
     if #[cfg(target_os = "l4re")] {
         // required libraries for L4Re are linked externally, ATM
     } else if #[cfg(feature = "std")] {
-        // cargo build, don't pull in anything extra as the libstd dep
-        // already pulls in all libs.
+        // cargo build. Most libraries are already pulled in by libstd dep
+        #[cfg_attr(
+            any(target_os = "macos", target_os = "ios"),
+            link(name = "iconv"))]
+        extern {}
     } else if #[cfg(all(target_os = "linux",
                         target_env = "gnu",
                         feature = "rustc-dep-of-std"))] {
@@ -1544,20 +1547,17 @@ extern "C" {
         len: ::off_t,
     ) -> ::c_int;
 
-    #[cfg_attr(target_os = "macos", link(name = "iconv"))]
     pub fn iconv_open(
         tocode: *const ::c_char,
         fromcode: *const ::c_char,
     ) -> iconv_t;
-    #[cfg_attr(target_os = "macos", link(name = "iconv"))]
     pub fn iconv(
         cd: iconv_t,
         inbuf: *mut *mut ::c_char,
         inbytesleft: *mut ::size_t,
         outbuf: *mut *mut ::c_char,
         outbytesleft: *mut ::size_t,
     ) -> ::size_t;
-    #[cfg_attr(target_os = "macos", link(name = "iconv"))]
     pub fn iconv_close(cd: iconv_t) -> ::c_int;
 }