Allow plugins to register LLVM passes

src/test/auxiliary/llvm_pass_plugin.rs

@@ -0,0 +1,28 @@
+// 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.
+
+// force-host
+
+#![feature(plugin_registrar)]
+#![feature(rustc_private)]
+
+extern crate rustc;
+
+use rustc::plugin::Registry;
+
+#[plugin_registrar]
+pub fn plugin_registrar(reg: &mut Registry) {
+    // This pass is built in to LLVM.
+    //
+    // Normally, we would name a pass that was registered through
+    // C++ static object constructors in the same .so file as the
+    // plugin registrar.
+    reg.register_llvm_pass("inline");
+}

src/test/run-pass-fulldeps/llvm-pass-plugin.rs

@@ -0,0 +1,17 @@
+// 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.
+
+// aux-build:llvm_pass_plugin.rs
+// ignore-stage1
+
+#![feature(plugin)]
+#![plugin(llvm_pass_plugin)]
+
+pub fn main() { }