From e8bc064c5ecf7775999beef233e2d82c9a534362 Mon Sep 17 00:00:00 2001
From: Gabriel Smith <ga29smith@gmail.com>
Date: Sun, 22 Jul 2018 20:33:04 -0400
Subject: [PATCH] Add regression test for issue #18804

Signed-off-by: Gabriel Smith <ga29smith@gmail.com>
---
 .../run-pass/issue-18804/auxiliary/lib.rs     | 20 +++++++++++++++++++
 src/test/run-pass/issue-18804/main.rs         | 20 +++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 src/test/run-pass/issue-18804/auxiliary/lib.rs
 create mode 100644 src/test/run-pass/issue-18804/main.rs

diff --git a/src/test/run-pass/issue-18804/auxiliary/lib.rs b/src/test/run-pass/issue-18804/auxiliary/lib.rs
new file mode 100644
index 0000000000000..06d454b2c890a
--- /dev/null
+++ b/src/test/run-pass/issue-18804/auxiliary/lib.rs
@@ -0,0 +1,20 @@
+// Copyright 2018 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.
+
+#![crate_type = "rlib"]
+#![feature(linkage)]
+
+pub fn foo<T>() -> *const() {
+    extern {
+        #[linkage = "extern_weak"]
+        static FOO: *const();
+    }
+    unsafe { FOO }
+}
diff --git a/src/test/run-pass/issue-18804/main.rs b/src/test/run-pass/issue-18804/main.rs
new file mode 100644
index 0000000000000..de7967e8d3490
--- /dev/null
+++ b/src/test/run-pass/issue-18804/main.rs
@@ -0,0 +1,20 @@
+// Copyright 2018 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.
+
+// Test for issue #18804, #[linkage] does not propagate thorugh generic
+// functions. Failure results in a linker error.
+
+// aux-build:lib.rs
+
+extern crate lib;
+
+fn main() {
+    lib::foo::<i32>();
+}