Reject `-L ""`, `-L native=`, and other empty search paths.

It wasn't clear to me that early_error was correct here, but it seems to
work. This code is reachable from `rustdoc`, which is problematic, because
early_error panics. rustc handles the panics gracefully (without ICEing or
crashing), but rustdoc does not. It's not the first such rustdoc problem,
though:

    $ rustdoc hello.rs --extern std=bad-std
    error: extern location for std does not exist: bad-std
    hello.rs:1:1: 1:1 error: can't find crate for `std`
    hello.rs:1
           ^
    error: aborting due to 2 previous errors
    thread '<unnamed>' panicked at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libsyntax/diagnostic.rs:151
    thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: "rustc failed"', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/result.rs:744
    thread '<main>' panicked at 'child thread None panicked', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/thread.rs:661

1 files changed, 4 insertions, 0 deletions

diff --git a/src/librustc/session/search_paths.rs b/src/librustc/session/search_paths.rs
index f85fb303910..3c5d9744505 100644
--- a/src/librustc/session/search_paths.rs
+++ b/src/librustc/session/search_paths.rs
@@ -10,6 +10,7 @@
 
 use std::slice;
 use std::path::{Path, PathBuf};
+use session::early_error;
 
 #[derive(Clone, Debug)]
 pub struct SearchPaths {
@@ -50,6 +51,9 @@ impl SearchPaths {
         } else {
             (PathKind::All, path)
         };
+        if path.is_empty() {
+            early_error("empty search path given via `-L`");
+        }
         self.paths.push((kind, PathBuf::new(path)));
     }