---

yaml
---
r: 148866
b: refs/heads/try2
c: b5f1979
h: refs/heads/master
v: v3

Author: alexcrichton

[refs]

@@ -5,7 +5,7 @@ refs/heads/snap-stage3: 78a7676898d9f80ab540c6df5d4c9ce35bb50463
 refs/heads/try: 519addf6277dbafccbb4159db4b710c37eaa2ec5
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b
-refs/heads/try2: b00147a99b289b11a210d9fc841b8aca3e59ce0e
+refs/heads/try2: b5f19795adda1bb2daca891e97bca8c7638916e2
 refs/heads/dist-snap: ba4081a5a8573875fed17545846f6f6902c8ba8d
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503

branches/try2/src/librustc/back/link.rs

@@ -98,13 +98,32 @@ pub mod write {
     use lib;
     use syntax::abi;
     use util::common::time;
+    use syntax::abi;
 
     use std::c_str::ToCStr;
     use std::libc::{c_uint, c_int};
     use std::path::Path;
     use std::run;
     use std::str;
 
+    // On android, we by default compile for armv7 processors. This enables
+    // things like double word CAS instructions (rather than emulating them)
+    // which are *far* more efficient. This is obviously undesirable in some
+    // cases, so if any sort of target feature is specified we don't append v7
+    // to the feature list.
+    fn target_feature<'a>(sess: &'a Session) -> &'a str {
+        match sess.targ_cfg.os {
+            abi::OsAndroid => {
+                if "" == sess.opts.target_feature {
+                    "+v7"
+                } else {
+                    sess.opts.target_feature.as_slice()
+                }
+            }
+            _ => sess.opts.target_feature.as_slice()
+        }
+    }
+
     pub fn run_passes(sess: Session,
                       trans: &CrateTranslation,
                       output_type: OutputType,
@@ -136,7 +155,7 @@ pub mod write {
 
             let tm = sess.targ_cfg.target_strs.target_triple.with_c_str(|T| {
                 sess.opts.target_cpu.with_c_str(|CPU| {
-                    sess.opts.target_feature.with_c_str(|Features| {
+                    target_feature(&sess).with_c_str(|Features| {
                         llvm::LLVMRustCreateTargetMachine(
                             T, CPU, Features,
                             lib::llvm::CodeModelDefault,