Canonicalize paths

Author: phil-opp

Diff for: src/librustc/session/config.rs

@@ -47,7 +47,7 @@ use std::hash::Hasher;
 use std::collections::hash_map::DefaultHasher;
 use std::collections::HashSet;
 use std::iter::FromIterator;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 pub struct Config {
     pub target: Target,
@@ -1905,7 +1905,13 @@ pub fn build_session_options_and_crate_config(
     let sysroot_opt = matches.opt_str("sysroot").map(|m| PathBuf::from(&m));
     let target_triple = if let Some(target) = matches.opt_str("target") {
         if target.ends_with(".json") {
-            TargetTriple::TargetPath(PathBuf::from(target))
+            let path = Path::new(&target);
+            match TargetTriple::from_path(&path) {
+                Ok(triple) => triple,
+                Err(_) => {
+                    early_error(error_format, &format!("target file {:?} does not exist", path))
+                }
+            }
         } else {
             TargetTriple::TargetTriple(target)
         }

Diff for: src/librustc_back/target/mod.rs

@@ -47,7 +47,7 @@
 use serialize::json::{Json, ToJson};
 use std::collections::BTreeMap;
 use std::default::Default;
-use std::fmt;
+use std::{fmt, io};
 use std::path::{Path, PathBuf};
 use syntax::abi::{Abi, lookup as lookup_abi};
 
@@ -1029,11 +1029,17 @@ pub enum TargetTriple {
 }
 
 impl TargetTriple {
-    /// Creates a target target from the passed target triple string.
+    /// Creates a target triple from the passed target triple string.
     pub fn from_triple(triple: &str) -> Self {
         TargetTriple::TargetTriple(triple.to_string())
     }
 
+    /// Creates a target triple from the passed target path.
+    pub fn from_path(path: &Path) -> Result<Self, io::Error> {
+        let canonicalized_path = path.canonicalize()?;
+        Ok(TargetTriple::TargetPath(canonicalized_path))
+    }
+
     /// Returns a string triple for this target.
     ///
     /// If this target is a path, the file name (without extension) is returned.