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Merge "Revert "Enable full LTO optimization by default"" into main

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Treehugger Robot 2024-03-22 09:01:23 +00:00 committed by Gerrit Code Review
commit bfa7f261d1
1 changed files with 6 additions and 5 deletions
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11
cc/lto.go
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@ -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")
}