Fix warnings when the "wasm" feature is disabled.

cranelift/src/clif-util.rs

@@ -24,6 +24,7 @@ extern crate cfg_if;
 extern crate capstone;
 extern crate clap;
 extern crate cranelift_codegen;
+#[cfg(feature = "wasm")]
 extern crate cranelift_entity;
 extern crate cranelift_filetests;
 extern crate cranelift_reader;
@@ -245,13 +246,14 @@ fn main() {
         ("wasm", Some(rest_cmd)) => {
             handle_debug_flag(rest_cmd.is_present("debug"));
 
+            #[cfg(feature = "wasm")]
+            let result = {
                 let mut target_val: &str = "";
                 if let Some(clap_target) = rest_cmd.value_of("target") {
                     target_val = clap_target;
                 }
 
-            #[cfg(feature = "wasm")]
-            let result = wasm::run(
+                wasm::run(
                     get_vec(rest_cmd.values_of("file")),
                     rest_cmd.is_present("verbose"),
                     rest_cmd.is_present("just-decode"),
@@ -261,7 +263,8 @@ fn main() {
                     target_val,
                     rest_cmd.is_present("print-size"),
                     rest_cmd.is_present("time-passes"),
-            );
+                )
+            };
 
             #[cfg(not(feature = "wasm"))]
             let result = Err("Error: clif-util was compiled without wasm support.".to_owned());

cranelift/src/utils.rs

@@ -25,6 +25,7 @@ pub fn read_to_string<P: AsRef<Path>>(path: P) -> io::Result<String> {
 }
 
 /// Read an entire file into a vector of bytes.
+#[cfg(feature = "wasm")]
 pub fn read_to_end<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
     let mut buffer = Vec::new();
     if path.as_ref() == Path::new("-") {