commit 406e7b725b9d51ff5e9eff6ed794a9e35a2eb3e3
author Yi Kong <yikong@google.com> Fri Oct 15 15:54:12 2021 +0800
committer Yi Kong <yikong@google.com> Wed Aug 17 09:27:02 2022 +0800
tree bed6a529f8fdde663b86d5b88dcff1e5eabd6ece
parent 2121d16db86ee25abcfc52efbe239acdd2f75ab1

Turn on Global ThinLTO by default

Apply ThinLTO without optimization (--lto-O0) globally. This saves us
2.24% in binary size for system/lib64, as well as more than 4.68% build
time improvement.

Test: presubmit
Bug: 169004486
Change-Id: I1ed90c2058f9ff1fa8a2d3fd7ac1191c5d98dac1

cc/lto.go

diff --git a/cc/lto.go b/cc/lto.go
index 1da69bf..304790c 100644
--- a/cc/lto.go
+++ b/cc/lto.go
@@ -155,7 +155,7 @@
 }
 
 func GlobalThinLTO(ctx android.BaseModuleContext) bool {
-	return ctx.Config().IsEnvTrue("GLOBAL_THINLTO")
+	return !ctx.Config().IsEnvFalse("GLOBAL_THINLTO")
 }
 
 // Propagate lto requirements down from binaries