who freebsd build fix unsupported RUN_LVL option only for other platforms.

src/uu/who/src/who.rs

@@ -29,7 +29,7 @@ mod options {
     pub const ONLY_HOSTNAME_USER: &str = "only_hostname_user";
     pub const PROCESS: &str = "process";
     pub const COUNT: &str = "count";
-    #[cfg(any(target_vendor = "apple", target_os = "linux", target_os = "android"))]
+    #[cfg(any(target_os = "linux", target_os = "android"))]
     pub const RUNLEVEL: &str = "runlevel";
     pub const SHORT: &str = "short";
     pub const TIME: &str = "time";
@@ -119,11 +119,13 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                 .help("all login names and number of users logged on"),
         )
         .arg(
-            #[cfg(any(target_vendor = "apple", target_os = "linux", target_os = "android"))]
+            #[cfg(any(target_os = "linux", target_os = "android"))]
             Arg::with_name(options::RUNLEVEL)
                 .long(options::RUNLEVEL)
                 .short("r")
                 .help("print current runlevel"),
+            #[cfg(any(target_vendor = "apple", target_os = "freebsd"))]
+            Arg::with_name(""),
         )
         .arg(
             Arg::with_name(options::SHORT)
@@ -265,10 +267,13 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
             assumptions = false;
         }
 
-        if matches.is_present(options::RUNLEVEL) {
-            need_runlevel = true;
-            include_idle = true;
-            assumptions = false;
+        #[cfg(any(target_os = "linux", target_os = "android"))]
+        {
+            if matches.is_present(options::RUNLEVEL) {
+                need_runlevel = true;
+                include_idle = true;
+                assumptions = false;
+            }
         }
 
         if matches.is_present(options::SHORT) {

tests/by-util/test_who.rs

@@ -83,7 +83,7 @@ fn test_process() {
     }
 }
 
-#[cfg(any(target_vendor = "apple", target_os = "linux"))]
+#[cfg(target_os = "linux")]
 #[test]
 fn test_runlevel() {
     for opt in vec!["-r", "--runlevel"] {
@@ -94,6 +94,19 @@ fn test_runlevel() {
     }
 }
 
+#[cfg(any(target_vendor = "apple", target_os = "freebsd"))]
+#[test]
+fn test_runlevel() {
+    let expected =
+        "error: Found argument";
+    for opt in vec!["-r", "--runlevel"] {
+        new_ucmd!()
+            .arg(opt)
+            .fails()
+            .stderr_contains(expected);
+    }
+}
+
 #[cfg(any(target_vendor = "apple", target_os = "linux"))]
 #[test]
 fn test_time() {
@@ -122,6 +135,7 @@ fn test_mesg() {
     }
 }
 
+#[cfg(target_os = "linux")]
 #[test]
 fn test_arg1_arg2() {
     let args = ["am", "i"];
@@ -132,6 +146,7 @@ fn test_arg1_arg2() {
         .stdout_is(expected_result(&args));
 }
 
+#[cfg(target_os = "linux")]
 #[test]
 fn test_too_many_args() {
     const EXPECTED: &str =