Revert^3 "Enable full LTO optimization by default"
7549990a957c66d1ed29bde27da05be001491f9f
Reason for revert: b/331528903
Change-Id: Idb013e97c84aeaf969522dc77abf94f23f721181
diff --git a/cc/lto.go b/cc/lto.go
index e2d99eb..05fa8ee 100644
--- a/cc/lto.go
+++ b/cc/lto.go
@@ -54,9 +54,6 @@
// Use -fwhole-program-vtables cflag.
Whole_program_vtables *bool
-
- // Use --lto-O0 flag.
- Lto_O0 *bool
}
type lto struct {
@@ -113,8 +110,12 @@
ltoCFlags := []string{"-flto=thin", "-fsplit-lto-unit"}
var ltoLdFlags []string
- // Do not perform costly LTO optimizations for Eng builds.
- if Bool(lto.Properties.Lto_O0) || ctx.Config().Eng() {
+ // The module did not explicitly turn on LTO. Only leverage LTO's
+ // better dead code elimination and CFG simplification, but do
+ // not perform costly optimizations for a balance between compile
+ // time, binary size and performance.
+ // Apply the same for Eng builds as well.
+ if !lto.ThinLTO() || ctx.Config().Eng() {
ltoLdFlags = append(ltoLdFlags, "-Wl,--lto-O0")
}