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Merge "Turn on Global ThinLTO by default" into main

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This commit is contained in:
Treehugger Robot 2023-07-11 17:42:12 +00:00 committed by Gerrit Code Review
commit 71f5a63267
2 changed files with 36 additions and 36 deletions
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7
cc/cc_test.go
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@ -4979,6 +4979,7 @@ func TestIncludeDirectoryOrdering(t *testing.T) {
conly := []string{"-fPIC", "${config.CommonGlobalConlyflags}"}
cppOnly := []string{"-fPIC", "${config.CommonGlobalCppflags}", "${config.DeviceGlobalCppflags}", "${config.ArmCppflags}"}
ltoFlags := []string{"-flto=thin", "-fsplit-lto-unit"}
cflags := []string{"-Werror", "-std=candcpp"}
cstd := []string{"-std=gnu17", "-std=conly"}
@ -5005,17 +5006,17 @@ func TestIncludeDirectoryOrdering(t *testing.T) {
{
name: "c",
src: "foo.c",
expected: combineSlices(baseExpectedFlags, conly, expectedIncludes, cflags, cstd, lastIncludes, []string{"${config.NoOverrideGlobalCflags}", "${config.NoOverrideExternalGlobalCflags}"}),
expected: combineSlices(baseExpectedFlags, conly, expectedIncludes, cflags, ltoFlags, cstd, lastIncludes, []string{"${config.NoOverrideGlobalCflags}", "${config.NoOverrideExternalGlobalCflags}"}),
},
{
name: "cc",
src: "foo.cc",
expected: combineSlices(baseExpectedFlags, cppOnly, expectedIncludes, cflags, cppstd, lastIncludes, []string{"${config.NoOverrideGlobalCflags}", "${config.NoOverrideExternalGlobalCflags}"}),
expected: combineSlices(baseExpectedFlags, cppOnly, expectedIncludes, cflags, ltoFlags, cppstd, lastIncludes, []string{"${config.NoOverrideGlobalCflags}", "${config.NoOverrideExternalGlobalCflags}"}),
},
{
name: "assemble",
src: "foo.s",
expected: combineSlices(baseExpectedFlags, []string{"${config.CommonGlobalAsflags}"}, expectedIncludes, lastIncludes),
expected: combineSlices(baseExpectedFlags, []string{"${config.CommonGlobalAsflags}"}, expectedIncludes, ltoFlags, lastIncludes),
},
}

65
cc/lto.go
View file

@ -47,6 +47,7 @@ type LTOProperties struct {
} `android:"arch_variant"`
LtoEnabled bool `blueprint:"mutated"`
LtoDefault bool `blueprint:"mutated"`
// Dep properties indicate that this module needs to be built with LTO
// since it is an object dependency of an LTO module.
@ -66,7 +67,34 @@ func (lto *lto) props() []interface{} {
}
func (lto *lto) begin(ctx BaseModuleContext) {
lto.Properties.LtoEnabled = lto.LTO(ctx)
// First, determine the module indepedent default LTO mode.
ltoDefault := GlobalThinLTO(ctx)
if ctx.Config().IsEnvTrue("DISABLE_LTO") {
ltoDefault = false
} else if ctx.Host() {
// Performance and binary size are less important for host binaries.
ltoDefault = false
}
// Then, determine the actual LTO mode to use. If different from `ltoDefault`, a variant needs
// to be created.
ltoEnabled := ltoDefault
if lto.Never() {
ltoEnabled = false
} else if lto.ThinLTO() {
// Module explicitly requests for LTO.
ltoEnabled = true
} else if ctx.testBinary() || ctx.testLibrary() {
// Do not enable LTO for tests for better debugging.
ltoEnabled = false
} else if ctx.isVndk() {
// FIXME: ThinLTO for VNDK produces different output.
// b/169217596
ltoEnabled = false
}
lto.Properties.LtoDefault = ltoDefault
lto.Properties.LtoEnabled = ltoEnabled
}
func (lto *lto) flags(ctx BaseModuleContext, flags Flags) Flags {
@ -118,34 +146,6 @@ func (lto *lto) flags(ctx BaseModuleContext, flags Flags) Flags {
return flags
}
// Determine which LTO mode to use for the given module.
func (lto *lto) LTO(ctx BaseModuleContext) bool {
if lto.Never() {
return false
}
if ctx.Config().IsEnvTrue("DISABLE_LTO") {
return false
}
// Module explicitly requests for LTO.
if lto.ThinLTO() {
return true
}
// LP32 has many subtle issues and less test coverage.
if ctx.Arch().ArchType.Multilib == "lib32" {
return false
}
// Performance and binary size are less important for host binaries and tests.
if ctx.Host() || ctx.testBinary() || ctx.testLibrary() {
return false
}
// FIXME: ThinLTO for VNDK produces different output.
// b/169217596
if ctx.isVndk() {
return false
}
return GlobalThinLTO(ctx)
}
func (lto *lto) ThinLTO() bool {
return lto != nil && proptools.Bool(lto.Properties.Lto.Thin)
}
@ -155,15 +155,13 @@ func (lto *lto) Never() bool {
}
func GlobalThinLTO(ctx android.BaseModuleContext) bool {
return ctx.Config().IsEnvTrue("GLOBAL_THINLTO")
return !ctx.Config().IsEnvFalse("GLOBAL_THINLTO")
}
// Propagate lto requirements down from binaries
func ltoDepsMutator(mctx android.TopDownMutatorContext) {
defaultLTOMode := GlobalThinLTO(mctx)
if m, ok := mctx.Module().(*Module); ok {
if m.lto == nil || m.lto.Properties.LtoEnabled == defaultLTOMode {
if m.lto == nil || m.lto.Properties.LtoEnabled == m.lto.Properties.LtoDefault {
return
}
@ -238,6 +236,7 @@ func ltoMutator(mctx android.BottomUpMutatorContext) {
}
variation.Properties.PreventInstall = true
variation.Properties.HideFromMake = true
variation.lto.Properties.LtoDefault = m.lto.Properties.LtoDefault
variation.lto.Properties.LtoDep = false
variation.lto.Properties.NoLtoDep = false
}