Add support for target-cpu=native

src/rustllvm/PassWrapper.cpp

@@ -14,6 +14,7 @@
 
 #include "llvm/Support/CBindingWrapping.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Target/TargetLibraryInfo.h"
 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
 
@@ -83,6 +84,11 @@ LLVMRustCreateTargetMachine(const char *triple,
         return NULL;
     }
 
+    StringRef real_cpu = cpu;
+    if (real_cpu == "native") {
+        real_cpu = sys::getHostCPUName();
+    }
+
     TargetOptions Options;
     Options.PositionIndependentExecutable = PositionIndependentExecutable;
     Options.NoFramePointerElim = NoFramePointerElim;
@@ -96,7 +102,7 @@ LLVMRustCreateTargetMachine(const char *triple,
     }
 
     TargetMachine *TM = TheTarget->createTargetMachine(Trip.getTriple(),
-                                                       cpu,
+                                                       real_cpu,
                                                        feature,
                                                        Options,
                                                        RM,

src/test/run-make/target-cpu-native/Makefile

+-include ../tools.mk
+
+all:
+	$(RUSTC) foo.rs -C target-cpu=native
+	$(call RUN,foo)

src/test/run-make/target-cpu-native/foo.rs

+// 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.
+
+fn main() {
+}