Deprecate ENOATTR on Linux and Android

libc-test/build.rs

@@ -1379,6 +1379,12 @@ fn test_android(target: &str) {
             // FIXME: deprecated: not available in any header
             // See: https://github.com/rust-lang/libc/issues/1356
             "ENOATTR" => true,
+
+            // FIXME: still necessary?
+            "SIG_DFL" | "SIG_ERR" | "SIG_IGN" => true, // sighandler_t weirdness
+            // FIXME: still necessary?
+            "SIGUNUSED" => true, // removed in glibc 2.26
+
             _ => false,
         }
     });

src/unix/notbsd/android/mod.rs

@@ -1792,7 +1792,10 @@ pub const SIOCSIFMAP: ::c_ulong = 0x00008971;
 pub const MODULE_INIT_IGNORE_MODVERSIONS: ::c_uint = 0x0001;
 pub const MODULE_INIT_IGNORE_VERMAGIC: ::c_uint = 0x0002;
 
-// Similarity to Linux it's not used but defined for compatibility.
+#[deprecated(
+    since = "0.2.55",
+    note = "ENOATTR is not available on Android; use ENODATA instead"
+)]
 pub const ENOATTR: ::c_int = ::ENODATA;
 
 // linux/if_alg.h

src/unix/notbsd/linux/mod.rs

@@ -1409,9 +1409,10 @@ pub const FALLOC_FL_ZERO_RANGE: ::c_int = 0x10;
 pub const FALLOC_FL_INSERT_RANGE: ::c_int = 0x20;
 pub const FALLOC_FL_UNSHARE_RANGE: ::c_int = 0x40;
 
-// On Linux, libc doesn't define this constant, libattr does instead.
-// We still define it for Linux as it's defined by libc on other platforms,
-// and it's mentioned in the man pages for getxattr and setxattr.
+#[deprecated(
+    since = "0.2.55",
+    note = "ENOATTR is not available on Linux; use ENODATA instead"
+)]
 pub const ENOATTR: ::c_int = ::ENODATA;
 
 pub const SO_ORIGINAL_DST: ::c_int = 80;