rustc: Ignore fs::canonicalize errors in metadata

src/librustc_metadata/creader.rs

@@ -236,9 +236,9 @@ impl<'a> CrateLoader<'a> {
                 // Only use `--extern crate_name=path` here, not `--extern crate_name`.
                 if let Some(mut files) = entry.files() {
                     if files.any(|l| {
-                        let l = fs::canonicalize(l).ok();
-                        source.dylib.as_ref().map(|p| &p.0) == l.as_ref()
-                            || source.rlib.as_ref().map(|p| &p.0) == l.as_ref()
+                        let l = fs::canonicalize(l).unwrap_or(l.clone().into());
+                        source.dylib.as_ref().map(|p| &p.0) == Some(&l)
+                            || source.rlib.as_ref().map(|p| &p.0) == Some(&l)
                     }) {
                         ret = Some(cnum);
                     }

src/librustc_metadata/locator.rs

@@ -426,20 +426,17 @@ impl<'a> CrateLocator<'a> {
             info!("lib candidate: {}", spf.path.display());
 
             let (rlibs, rmetas, dylibs) = candidates.entry(hash.to_string()).or_default();
-            fs::canonicalize(&spf.path)
-                .map(|p| {
-                    if seen_paths.contains(&p) {
-                        return FileDoesntMatch;
-                    };
-                    seen_paths.insert(p.clone());
-                    match found_kind {
-                        CrateFlavor::Rlib => rlibs.insert(p, kind),
-                        CrateFlavor::Rmeta => rmetas.insert(p, kind),
-                        CrateFlavor::Dylib => dylibs.insert(p, kind),
-                    };
-                    FileMatches
-                })
-                .unwrap_or(FileDoesntMatch)
+            let path = fs::canonicalize(&spf.path).unwrap_or_else(|_| spf.path.clone());
+            if seen_paths.contains(&path) {
+                return FileDoesntMatch;
+            };
+            seen_paths.insert(path.clone());
+            match found_kind {
+                CrateFlavor::Rlib => rlibs.insert(path, kind),
+                CrateFlavor::Rmeta => rmetas.insert(path, kind),
+                CrateFlavor::Dylib => dylibs.insert(path, kind),
+            };
+            FileMatches
         });
         self.rejected_via_kind.extend(staticlibs);
 
@@ -688,12 +685,13 @@ impl<'a> CrateLocator<'a> {
                     && file.ends_with(&self.target.options.dll_suffix)
             {
                 // Make sure there's at most one rlib and at most one dylib.
+                let loc = fs::canonicalize(&loc).unwrap_or_else(|_| loc.clone());
                 if loc.file_name().unwrap().to_str().unwrap().ends_with(".rlib") {
-                    rlibs.insert(fs::canonicalize(&loc).unwrap(), PathKind::ExternFlag);
+                    rlibs.insert(loc, PathKind::ExternFlag);
                 } else if loc.file_name().unwrap().to_str().unwrap().ends_with(".rmeta") {
-                    rmetas.insert(fs::canonicalize(&loc).unwrap(), PathKind::ExternFlag);
+                    rmetas.insert(loc, PathKind::ExternFlag);
                 } else {
-                    dylibs.insert(fs::canonicalize(&loc).unwrap(), PathKind::ExternFlag);
+                    dylibs.insert(loc, PathKind::ExternFlag);
                 }
             } else {
                 self.rejected_via_filename

src/librustc_session/filesearch.rs

@@ -117,28 +117,22 @@ pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
 
 pub fn get_or_default_sysroot() -> PathBuf {
     // Follow symlinks.  If the resolved path is relative, make it absolute.
-    fn canonicalize(path: Option<PathBuf>) -> Option<PathBuf> {
-        path.and_then(|path| {
-            match fs::canonicalize(&path) {
-                // See comments on this target function, but the gist is that
-                // gcc chokes on verbatim paths which fs::canonicalize generates
-                // so we try to avoid those kinds of paths.
-                Ok(canon) => Some(fix_windows_verbatim_for_gcc(&canon)),
-                Err(e) => panic!("failed to get realpath: {}", e),
-            }
-        })
+    fn canonicalize(path: PathBuf) -> PathBuf {
+        let path = fs::canonicalize(&path).unwrap_or(path);
+        // See comments on this target function, but the gist is that
+        // gcc chokes on verbatim paths which fs::canonicalize generates
+        // so we try to avoid those kinds of paths.
+        fix_windows_verbatim_for_gcc(&path)
     }
 
     match env::current_exe() {
-        Ok(exe) => match canonicalize(Some(exe)) {
-            Some(mut p) => {
-                p.pop();
-                p.pop();
-                p
-            }
-            None => panic!("can't determine value for sysroot"),
-        },
-        Err(ref e) => panic!(format!("failed to get current_exe: {}", e)),
+        Ok(exe) => {
+            let mut p = canonicalize(exe);
+            p.pop();
+            p.pop();
+            p
+        }
+        Err(e) => panic!("failed to get current_exe: {}", e),
     }
 }