Create a new feature for Fuchsia-enabled utilities.

Cargo.toml

@@ -36,6 +36,89 @@ unix = [
   "users",
   "who",
 ]
+# Feature "fuchsia" contains the exclusive list of utilities
+# that can be compiled and run on Fuchsia. Should be built
+# with --no-default-features when selecting this feature.
+# TODO: merge with "generic"/"unix" to avoid duplication
+# once we support all utilities in that feature.
+fuchsia = [
+  # From unix
+  "arch",
+  "chgrp",
+  "chmod",
+  "chown",
+  "du",
+  "groups",
+  "hostid",
+  "install",
+  "logname",
+  "mkfifo",
+  "mknod",
+  "nice",
+  "pathchk",
+  "stdbuf",
+  "touch",
+  "tty",
+  "uname",
+  "unlink",
+
+  # From generic
+  "base32",
+  "base64",
+  "basename",
+  "cat",
+  "cksum",
+  "comm",
+  "cp",
+  "cut",
+  "dircolors",
+  "dirname",
+  "echo",
+  "env",
+  "expand",
+  "expr",
+  "factor",
+  "false",
+  "fmt",
+  "fold",
+  "hashsum",
+  "head",
+  "link",
+  "ln",
+  "mkdir",
+  "mv",
+  "nl",
+  "od",
+  "paste",
+  "printenv",
+  "printf",
+  "pwd",
+  "readlink",
+  "realpath",
+  "relpath",
+  "rm",
+  "rmdir",
+  "seq",
+  "shred",
+  "shuf",
+  "sleep",
+  "sort",
+  "split",
+  "sum",
+  "sync",
+  "tac",
+  "tail",
+  "tee",
+  "test",
+  "tr",
+  "true",
+  "truncate",
+  "tsort",
+  "unexpand",
+  "wc",
+  "whoami",
+  "yes",
+]
 generic = [
   "base32",
   "base64",

build.rs

@@ -12,7 +12,7 @@ pub fn main() {
         if val == "1" && key.starts_with(feature_prefix) {
             let krate = key[feature_prefix.len()..].to_lowercase();
             match krate.as_ref() {
-                "default" | "unix" | "generic" | "nightly" | "test_unimplemented" => continue,
+                "default" | "unix" | "fuchsia" | "generic" | "nightly" | "test_unimplemented" => continue,
                 _ => {},
             }
             crates.push(krate.to_string());