commit fd8bb93874b9288baf288349321b86ebe3953275
author Yi Kong <yikong@google.com> Mon Mar 12 16:52:57 2018 -0700
committer Yi Kong <yikong@google.com> Fri Mar 16 12:20:58 2018 -0700
tree fa963bf6899943aba95786081c15157736008449
parent 51986daae0bf23a2eab9eb2daf7bf261be502f49

Enable ThinLTO for libart

This helps reducing binary size as well as improve performance of
libart.

On Marlin
                      No LTO    ThinLTO   Improvement
  libart.so           5.82MB    5.66MB    2.75%
  libart.so (64)      7.71MB    7.44MB    3.44%
  atest (AppStartup)  270.13    265.13    1.85%
  dex2oat             536.04    533.03    0.56%

Bug: 62839002
Test: Benchmark on Marlin
Change-Id: Ic386ebceecf89239ad4f28db28b9bfd641efc45c

runtime/Android.bp

diff --git a/runtime/Android.bp b/runtime/Android.bp
index 590a399..51fbb2e 100644
--- a/runtime/Android.bp
+++ b/runtime/Android.bp
@@ -476,6 +476,13 @@
     export_shared_lib_headers: [
         "libdexfile",
     ],
+    target: {
+        android: {
+            lto: {
+                 thin: true,
+            },
+        },
+    },
 }
 
 art_cc_library {