Merge "Revert "Enable full LTO optimization by default"" into main (bfa7f261) · Commits · e / os / android_build_soong

cc/lto.go

+6 −5

Original line number	Diff line number	Diff line
		@@ -54,9 +54,6 @@ type LTOProperties struct {

		// Use -fwhole-program-vtables cflag.
		Whole_program_vtables *bool

		// Use --lto-O0 flag.
		Lto_O0 *bool
		}

		type lto struct {
		@@ -113,8 +110,12 @@ func (lto *lto) flags(ctx ModuleContext, flags Flags) Flags {
		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")
		}