get cargo-miri to work

src/bin/cargo-miri.rs

@@ -44,8 +44,6 @@ fn main() {
         return;
     }
 
-    let dep_path = std::env::current_dir().expect("current dir is not readable").join("target").join("debug").join("deps");
-
     if let Some("miri") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
         // this arm is when `cargo miri` is called
 
@@ -84,13 +82,11 @@ fn main() {
             let args = std::env::args().skip(skip);
             let kind = target.kind.get(0).expect("badly formatted cargo metadata: target::kind is an empty array");
             if test && kind == "test" {
-                if let Err(code) = process(vec!["--test".to_string(), target.name].into_iter().chain(args),
-                                           &dep_path) {
+                if let Err(code) = process(vec!["--test".to_string(), target.name].into_iter().chain(args)) {
                     std::process::exit(code);
                 }
             } else if !test && kind == "bin" {
-                if let Err(code) = process(vec!["--bin".to_string(), target.name].into_iter().chain(args),
-                                           &dep_path) {
+                if let Err(code) = process(vec!["--bin".to_string(), target.name].into_iter().chain(args)) {
                     std::process::exit(code);
                 }
             }
@@ -117,7 +113,7 @@ fn main() {
                 .expect("need to specify RUST_SYSROOT env var during miri compilation, or use rustup or multirust")
         };
 
-        // this conditional check for the --sysroot flag is there so users can call `cargo-clippy` directly
+        // this conditional check for the --sysroot flag is there so users can call `cargo-miri` directly
         // without having to pass --sysroot or anything
         let mut args: Vec<String> = if std::env::args().any(|s| s == "--sysroot") {
             std::env::args().skip(1).collect()
@@ -129,25 +125,29 @@ fn main() {
         // interpreted but not built
         let miri_enabled = std::env::args().any(|s| s == "-Zno-trans");
 
-        if miri_enabled {
-            args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-miri""#.to_owned()]);
-        }
+        let mut command = if miri_enabled {
+            let mut path = std::env::current_exe().expect("current executable path invalid");
+            path.set_file_name("miri");
+            Command::new(path)
+        } else {
+            Command::new("rustc")
+        };
 
-        let mut path = std::env::current_exe().expect("current executable path invalid");
-        path.set_file_name("miri");
+        args.extend_from_slice(&["-Z".to_owned(), "always-encode-mir".to_owned()]);
+        args.extend_from_slice(&["--cfg".to_owned(), r#"feature="cargo-miri""#.to_owned()]);
 
-        match Command::new(path).args(&args).status() {
+        match command.args(&args).status() {
             Ok(exit) => if !exit.success() {
                 std::process::exit(exit.code().unwrap_or(42));
             },
-            Err(e) => panic!("error during miri run: {:?}", e),
+            Err(ref e) if miri_enabled => panic!("error during miri run: {:?}", e),
+            Err(ref e) => panic!("error during rustc call: {:?}", e),
         }
     }
 }
 
-fn process<P, I>(old_args: I, dep_path: P) -> Result<(), i32>
-    where P: AsRef<Path>,
-          I: Iterator<Item = String>
+fn process<I>(old_args: I) -> Result<(), i32>
+    where I: Iterator<Item = String>
 {
     let mut args = vec!["rustc".to_owned()];
 
@@ -159,8 +159,6 @@ fn process<P, I>(old_args: I, dep_path: P) -> Result<(), i32>
     if !found_dashes {
         args.push("--".to_owned());
     }
-    args.push("-L".to_owned());
-    args.push(dep_path.as_ref().to_string_lossy().into_owned());
     args.push("-Zno-trans".to_owned());
     args.push("--cfg".to_owned());
     args.push(r#"feature="cargo-miri""#.to_owned());