Add necessary conditional compilation cfgs

crates/resolver/src/hosts.rs

@@ -3,13 +3,11 @@
 use std::collections::HashMap;
 use std::io;
 use std::path::Path;
-#[cfg(any(unix, windows))]
 use std::str::FromStr;
 use std::sync::Arc;
 
 use proto::op::Query;
 use proto::rr::{Name, RecordType};
-#[cfg(any(unix, windows))]
 use proto::rr::{RData, Record};
 use tracing::warn;
 
@@ -35,10 +33,17 @@ impl Hosts {
     /// Creates a new configuration from the system hosts file,
     /// only works for Windows and Unix-like OSes,
     /// will return empty configuration on others
+    #[cfg(any(unix, windows))]
     pub fn new() -> Self {
         read_hosts_conf(hosts_path()).unwrap_or_default()
     }
 
+    /// Creates a default configuration for non Windows or Unix-like OSes
+    #[cfg(not(any(unix, windows)))]
+    pub fn new() -> Self {
+        Hosts::default()
+    }
+
     /// Look up the addresses for the given host from the system hosts file.
     pub fn lookup_static_host(&self, query: &Query) -> Option<Lookup> {
         if !self.by_name.is_empty() {
@@ -175,14 +180,6 @@ pub(crate) fn read_hosts_conf<P: AsRef<Path>>(path: P) -> io::Result<Hosts> {
     Hosts::default().read_hosts_conf(file)
 }
 
-#[cfg(not(any(unix, windows)))]
-pub fn read_hosts_conf<P: AsRef<Path>>(_path: P) -> io::Result<Hosts> {
-    Err(io::Error::new(
-        io::ErrorKind::Other,
-        "Only Windows or Unix-like hosts file is supported".to_string(),
-    ))
-}
-
 #[cfg(any(unix, windows))]
 #[cfg(test)]
 mod tests {