From 12b3498cedb3a3f2568a9e8796a52d3a6f234f26 Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Mon, 7 Jul 2014 09:54:38 -0700
Subject: [PATCH] Strip empty strings from link args

Closes #15487
---
 src/librustc/metadata/cstore.rs  |  2 +-
 src/test/run-pass/issue-15487.rs | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 src/test/run-pass/issue-15487.rs

diff --git a/src/librustc/metadata/cstore.rs b/src/librustc/metadata/cstore.rs
index 9d6fd109b48db..5dafb7a661dfd 100644
--- a/src/librustc/metadata/cstore.rs
+++ b/src/librustc/metadata/cstore.rs
@@ -196,7 +196,7 @@ impl CStore {
     }
 
     pub fn add_used_link_args(&self, args: &str) {
-        for s in args.split(' ') {
+        for s in args.split(' ').filter(|s| !s.is_empty()) {
             self.used_link_args.borrow_mut().push(s.to_string());
         }
     }
diff --git a/src/test/run-pass/issue-15487.rs b/src/test/run-pass/issue-15487.rs
new file mode 100644
index 0000000000000..ee7595819bff0
--- /dev/null
+++ b/src/test/run-pass/issue-15487.rs
@@ -0,0 +1,20 @@
+// Copyright 2014 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.
+
+// ignore-win32
+
+#![feature(link_args)]
+
+#[link_args="-lc  -lm"]
+#[link_args=" -lc"]
+#[link_args="-lc "]
+extern {}
+
+fn main() {}