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, 15 insertions, 0 deletions

diff --git a/src/test/compile-fail/manual-link-bad-search-path.rs b/src/test/compile-fail/manual-link-bad-search-path.rs
new file mode 100644
index 00000000000..2bf61cbe24c
--- /dev/null
+++ b/src/test/compile-fail/manual-link-bad-search-path.rs
@@ -0,0 +1,15 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags:-L native=
+// error-pattern: empty search path given via `-L`
+
+fn main() {
+}