From c74f1b6bac57b626e541b471d40de4691fa2c8e4 Mon Sep 17 00:00:00 2001
From: Yi Kong <yikong@google.com>
Date: Tue, 23 Feb 2021 20:00:37 +0800
Subject: [PATCH] PGO for libc++

This improves app launch time by 0.76%.

Test: presubmit
Bug: 181102883
Bug: 175205560
Change-Id: Ic541e376d3c907c6d896621e5afedba8e1045f88
---
 Android.bp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Android.bp b/Android.bp
index 2dbe41e3c..2d426ceca 100644
--- a/Android.bp
+++ b/Android.bp
@@ -160,7 +160,16 @@ cc_library_shared {
     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",