commit c74f1b6bac57b626e541b471d40de4691fa2c8e4
author Yi Kong <yikong@google.com> Tue Feb 23 20:00:37 2021 +0800
committer Yi Kong <yikong@google.com> Wed Feb 24 18:11:18 2021 +0800
tree dade513ca5fb6e74be05a2b9ab97e2814a6ac863
parent e12048675382cd2706651be5a76b209b330966f6

PGO for libc++

This improves app launch time by 0.76%.

Test: presubmit
Bug: 181102883
Bug: 175205560
Change-Id: Ic541e376d3c907c6d896621e5afedba8e1045f88

Android.bp

diff --git a/Android.bp b/Android.bp
index 2dbe41e..2d426ce 100644
--- a/Android.bp
+++ b/Android.bp
@@ -160,7 +160,16 @@
     whole_static_libs: ["libc++_static"],
     stl: "none",
 
+    pgo: {
+        sampling: true,
+    },
+
     target: {
+        android: {
+            pgo: {
+                profile_file: "libc++/libc++.profdata",
+            },
+        },
         darwin: {
             unexported_symbols_list: "lib/libc++unexp.exp",
             force_symbols_not_weak_list: "lib/notweak.exp",