From 849423b100f419a48169454d661d2f378c4877c4 Mon Sep 17 00:00:00 2001
From: Niels Grewe <niels.grewe@halbordnung.de>
Date: Wed, 9 Sep 2015 10:57:03 +0200
Subject: [PATCH] Actually add the rust side of the test

---
 gcc-test/build.rs     |  4 ++++
 gcc-test/tests/all.rs | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/gcc-test/build.rs b/gcc-test/build.rs
index 141e36f..132614f 100644
--- a/gcc-test/build.rs
+++ b/gcc-test/build.rs
@@ -69,4 +69,8 @@ fn main() {
         println!("cargo:rustc-link-lib=msvc");
         println!("cargo:rustc-link-search={}", out.display());
     }
+
+    // This tests whether we  can build a library but not link it to the main crate.
+    // The test module will do its own linking.
+    gcc::Config::new().link(false).file("src/opt_linkage.c").compile("libOptLinkage.a");
 }
diff --git a/gcc-test/tests/all.rs b/gcc-test/tests/all.rs
index ef58550..2537960 100644
--- a/gcc-test/tests/all.rs
+++ b/gcc-test/tests/all.rs
@@ -2,6 +2,14 @@ extern crate gcc_test;
 
 use gcc_test::*;
 
+
+// This will cause a link failure if the archive is already
+// linked against the gcc_test crate.
+#[link(name = "OptLinkage", kind = "static")]
+extern {
+  fn answer() -> i32;
+}
+
 #[test]
 fn foo_here() {
     unsafe {
@@ -46,3 +54,8 @@ fn msvc_here() {
         msvc();
     }
 }
+
+#[test]
+fn opt_linkage() {
+   unsafe { assert_eq!(answer(),42); }
+}