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platform_build_soong/android/arch.go

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// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package android
import (
"encoding"
"fmt"
"reflect"
"runtime"
"strconv"
"strings"
"github.com/google/blueprint"
"github.com/google/blueprint/bootstrap"
"github.com/google/blueprint/proptools"
)
const COMMON_VARIANT = "common"
var (
archTypeList []ArchType
Arm = newArch("arm", "lib32")
Arm64 = newArch("arm64", "lib64")
X86 = newArch("x86", "lib32")
X86_64 = newArch("x86_64", "lib64")
Common = ArchType{
Name: COMMON_VARIANT,
}
)
var archTypeMap = map[string]ArchType{
"arm": Arm,
"arm64": Arm64,
"x86": X86,
"x86_64": X86_64,
}
/*
Example blueprints file containing all variant property groups, with comment listing what type
of variants get properties in that group:
module {
arch: {
arm: {
// Host or device variants with arm architecture
},
arm64: {
// Host or device variants with arm64 architecture
},
x86: {
// Host or device variants with x86 architecture
},
x86_64: {
// Host or device variants with x86_64 architecture
},
},
multilib: {
lib32: {
// Host or device variants for 32-bit architectures
},
lib64: {
// Host or device variants for 64-bit architectures
},
},
target: {
android: {
// Device variants (implies Bionic)
},
host: {
// Host variants
},
bionic: {
// Bionic (device and host) variants
},
linux_bionic: {
// Bionic host variants
},
linux: {
// Bionic (device and host) and Linux glibc variants
},
linux_glibc: {
// Linux host variants (using non-Bionic libc)
},
darwin: {
// Darwin host variants
},
windows: {
// Windows host variants
},
not_windows: {
// Non-windows host variants
},
android_arm: {
// Any <os>_<arch> combination restricts to that os and arch
},
},
}
*/
var archVariants = map[ArchType][]string{
Arm: {
"armv7-a",
"armv7-a-neon",
"armv8-a",
"armv8-2a",
"cortex-a7",
"cortex-a8",
"cortex-a9",
"cortex-a15",
"cortex-a53",
"cortex-a53-a57",
"cortex-a55",
"cortex-a72",
"cortex-a73",
"cortex-a75",
"cortex-a76",
"krait",
"kryo",
"kryo385",
"exynos-m1",
"exynos-m2",
},
Arm64: {
"armv8_a",
"armv8_2a",
"armv8-2a-dotprod",
"cortex-a53",
"cortex-a55",
"cortex-a72",
"cortex-a73",
"cortex-a75",
"cortex-a76",
"kryo",
"kryo385",
"exynos-m1",
"exynos-m2",
},
X86: {
"amberlake",
"atom",
"broadwell",
"haswell",
"icelake",
"ivybridge",
"kabylake",
"sandybridge",
"silvermont",
"skylake",
"stoneyridge",
"tigerlake",
"whiskeylake",
"x86_64",
},
X86_64: {
"amberlake",
"broadwell",
"haswell",
"icelake",
"ivybridge",
"kabylake",
"sandybridge",
"silvermont",
"skylake",
"stoneyridge",
"tigerlake",
"whiskeylake",
},
}
var archFeatures = map[ArchType][]string{
Arm: {
"neon",
},
Arm64: {
"dotprod",
},
X86: {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"avx2",
"avx512",
"popcnt",
"movbe",
},
X86_64: {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"avx2",
"avx512",
"popcnt",
},
}
var archFeatureMap = map[ArchType]map[string][]string{
Arm: {
"armv7-a-neon": {
"neon",
},
"armv8-a": {
"neon",
},
"armv8-2a": {
"neon",
},
},
Arm64: {
"armv8-2a-dotprod": {
"dotprod",
},
},
X86: {
"amberlake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"aes_ni",
"popcnt",
},
"atom": {
"ssse3",
"movbe",
},
"broadwell": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"aes_ni",
"popcnt",
},
"haswell": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"popcnt",
"movbe",
},
"icelake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
"ivybridge": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"popcnt",
},
"kabylake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"aes_ni",
"popcnt",
},
"sandybridge": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"popcnt",
},
"silvermont": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"popcnt",
"movbe",
},
"skylake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
"stoneyridge": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"avx2",
"popcnt",
"movbe",
},
"tigerlake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
"whiskeylake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
"x86_64": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"popcnt",
},
},
X86_64: {
"amberlake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"aes_ni",
"popcnt",
},
"broadwell": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"aes_ni",
"popcnt",
},
"haswell": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"popcnt",
},
"icelake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
"ivybridge": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"popcnt",
},
"kabylake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"aes_ni",
"popcnt",
},
"sandybridge": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"popcnt",
},
"silvermont": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"popcnt",
},
"skylake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
"stoneyridge": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"aes_ni",
"avx",
"avx2",
"popcnt",
},
"tigerlake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
"whiskeylake": {
"ssse3",
"sse4",
"sse4_1",
"sse4_2",
"avx",
"avx2",
"avx512",
"aes_ni",
"popcnt",
},
},
}
var defaultArchFeatureMap = map[OsType]map[ArchType][]string{}
func RegisterDefaultArchVariantFeatures(os OsType, arch ArchType, features ...string) {
checkCalledFromInit()
for _, feature := range features {
if !InList(feature, archFeatures[arch]) {
panic(fmt.Errorf("Invalid feature %q for arch %q variant \"\"", feature, arch))
}
}
if defaultArchFeatureMap[os] == nil {
defaultArchFeatureMap[os] = make(map[ArchType][]string)
}
defaultArchFeatureMap[os][arch] = features
}
// An Arch indicates a single CPU architecture.
type Arch struct {
ArchType ArchType
ArchVariant string
CpuVariant string
Abi []string
ArchFeatures []string
}
func (a Arch) String() string {
s := a.ArchType.String()
if a.ArchVariant != "" {
s += "_" + a.ArchVariant
}
if a.CpuVariant != "" {
s += "_" + a.CpuVariant
}
return s
}
type ArchType struct {
Name string
Field string
Multilib string
}
func newArch(name, multilib string) ArchType {
archType := ArchType{
Name: name,
Field: proptools.FieldNameForProperty(name),
Multilib: multilib,
}
archTypeList = append(archTypeList, archType)
return archType
}
func ArchTypeList() []ArchType {
return append([]ArchType(nil), archTypeList...)
}
func (a ArchType) String() string {
return a.Name
}
var _ encoding.TextMarshaler = ArchType{}
func (a ArchType) MarshalText() ([]byte, error) {
return []byte(strconv.Quote(a.String())), nil
}
var _ encoding.TextUnmarshaler = &ArchType{}
func (a *ArchType) UnmarshalText(text []byte) error {
if u, ok := archTypeMap[string(text)]; ok {
*a = u
return nil
}
return fmt.Errorf("unknown ArchType %q", text)
}
var BuildOs = func() OsType {
switch runtime.GOOS {
case "linux":
return Linux
case "darwin":
return Darwin
default:
panic(fmt.Sprintf("unsupported OS: %s", runtime.GOOS))
}
}()
var BuildArch = func() ArchType {
switch runtime.GOARCH {
case "amd64":
return X86_64
default:
panic(fmt.Sprintf("unsupported Arch: %s", runtime.GOARCH))
}
}()
var (
OsTypeList []OsType
commonTargetMap = make(map[string]Target)
NoOsType OsType
Linux = NewOsType("linux_glibc", Host, false)
Darwin = NewOsType("darwin", Host, false)
LinuxBionic = NewOsType("linux_bionic", Host, false)
Windows = NewOsType("windows", Host, true)
Android = NewOsType("android", Device, false)
Fuchsia = NewOsType("fuchsia", Device, false)
// A pseudo OSType for a common os variant, which is OSType agnostic and which
// has dependencies on all the OS variants.
CommonOS = NewOsType("common_os", Generic, false)
osArchTypeMap = map[OsType][]ArchType{
Linux: []ArchType{X86, X86_64},
LinuxBionic: []ArchType{Arm64, X86_64},
Darwin: []ArchType{X86_64},
Windows: []ArchType{X86, X86_64},
Android: []ArchType{Arm, Arm64, X86, X86_64},
Fuchsia: []ArchType{Arm64, X86_64},
}
)
type OsType struct {
Name, Field string
Class OsClass
DefaultDisabled bool
}
type OsClass int
const (
Generic OsClass = iota
Device
Host
)
func (class OsClass) String() string {
switch class {
case Generic:
return "generic"
case Device:
return "device"
case Host:
return "host"
default:
panic(fmt.Errorf("unknown class %d", class))
}
}
func (os OsType) String() string {
return os.Name
}
func (os OsType) Bionic() bool {
return os == Android || os == LinuxBionic
}
func (os OsType) Linux() bool {
return os == Android || os == Linux || os == LinuxBionic
}
func NewOsType(name string, class OsClass, defDisabled bool) OsType {
os := OsType{
Name: name,
Field: strings.Title(name),
Class: class,
DefaultDisabled: defDisabled,
}
OsTypeList = append(OsTypeList, os)
if _, found := commonTargetMap[name]; found {
panic(fmt.Errorf("Found Os type duplicate during OsType registration: %q", name))
} else {
commonTargetMap[name] = Target{Os: os, Arch: Arch{ArchType: Common}}
}
return os
}
func osByName(name string) OsType {
for _, os := range OsTypeList {
if os.Name == name {
return os
}
}
return NoOsType
}
type NativeBridgeSupport bool
const (
NativeBridgeDisabled NativeBridgeSupport = false
NativeBridgeEnabled NativeBridgeSupport = true
)
type Target struct {
Os OsType
Arch Arch
NativeBridge NativeBridgeSupport
NativeBridgeHostArchName string
NativeBridgeRelativePath string
// HostCross is true when the target cannot run natively on the current build host.
// For example, linux_glibc_x86 returns true on a regular x86/i686/Linux machines, but returns false
// on Mac (different OS), or on 64-bit only i686/Linux machines (unsupported arch).
HostCross bool
}
func (target Target) String() string {
return target.OsVariation() + "_" + target.ArchVariation()
}
func (target Target) OsVariation() string {
return target.Os.String()
}
func (target Target) ArchVariation() string {
var variation string
if target.NativeBridge {
variation = "native_bridge_"
}
variation += target.Arch.String()
return variation
}
func (target Target) Variations() []blueprint.Variation {
return []blueprint.Variation{
{Mutator: "os", Variation: target.OsVariation()},
{Mutator: "arch", Variation: target.ArchVariation()},
}
}
func osMutator(bpctx blueprint.BottomUpMutatorContext) {
var module Module
var ok bool
if module, ok = bpctx.Module().(Module); !ok {
if bootstrap.IsBootstrapModule(bpctx.Module()) {
// Bootstrap Go modules are always the build OS or linux bionic.
config := bpctx.Config().(Config)
osNames := []string{config.BuildOSTarget.OsVariation()}
for _, hostCrossTarget := range config.Targets[LinuxBionic] {
if hostCrossTarget.Arch.ArchType == config.BuildOSTarget.Arch.ArchType {
osNames = append(osNames, hostCrossTarget.OsVariation())
}
}
osNames = FirstUniqueStrings(osNames)
bpctx.CreateVariations(osNames...)
}
return
}
// Bootstrap Go module support above requires this mutator to be a
// blueprint.BottomUpMutatorContext because android.BottomUpMutatorContext
// filters out non-Soong modules. Now that we've handled them, create a
// normal android.BottomUpMutatorContext.
mctx := bottomUpMutatorContextFactory(bpctx, module, false)
base := module.base()
if !base.ArchSpecific() {
return
}
var moduleOSList []OsType
for _, os := range OsTypeList {
for _, t := range mctx.Config().Targets[os] {
if base.supportsTarget(t, mctx.Config()) {
moduleOSList = append(moduleOSList, os)
break
}
}
}
if len(moduleOSList) == 0 {
base.Disable()
return
}
osNames := make([]string, len(moduleOSList))
for i, os := range moduleOSList {
osNames[i] = os.String()
}
createCommonOSVariant := base.commonProperties.CreateCommonOSVariant
if createCommonOSVariant {
// A CommonOS variant was requested so add it to the list of OS's variants to
// create. It needs to be added to the end because it needs to depend on the
// the other variants in the list returned by CreateVariations(...) and inter
// variant dependencies can only be created from a later variant in that list to
// an earlier one. That is because variants are always processed in the order in
// which they are returned from CreateVariations(...).
osNames = append(osNames, CommonOS.Name)
moduleOSList = append(moduleOSList, CommonOS)
}
modules := mctx.CreateVariations(osNames...)
for i, m := range modules {
m.base().commonProperties.CompileOS = moduleOSList[i]
m.base().setOSProperties(mctx)
}
if createCommonOSVariant {
// A CommonOS variant was requested so add dependencies from it (the last one in
// the list) to the OS type specific variants.
last := len(modules) - 1
commonOSVariant := modules[last]
commonOSVariant.base().commonProperties.CommonOSVariant = true
for _, module := range modules[0:last] {
// Ignore modules that are enabled. Note, this will only avoid adding
// dependencies on OsType variants that are explicitly disabled in their
// properties. The CommonOS variant will still depend on disabled variants
// if they are disabled afterwards, e.g. in archMutator if
if module.Enabled() {
mctx.AddInterVariantDependency(commonOsToOsSpecificVariantTag, commonOSVariant, module)
}
}
}
}
type archDepTag struct {
blueprint.BaseDependencyTag
name string
}
// Identifies the dependency from CommonOS variant to the os specific variants.
var commonOsToOsSpecificVariantTag = archDepTag{name: "common os to os specific"}
// Identifies the dependency from arch variant to the common variant for a "common_first" multilib.
var firstArchToCommonArchDepTag = archDepTag{name: "first arch to common arch"}
// Get the OsType specific variants for the current CommonOS variant.
//
// The returned list will only contain enabled OsType specific variants of the
// module referenced in the supplied context. An empty list is returned if there
// are no enabled variants or the supplied context is not for an CommonOS
// variant.
func GetOsSpecificVariantsOfCommonOSVariant(mctx BaseModuleContext) []Module {
var variants []Module
mctx.VisitDirectDeps(func(m Module) {
if mctx.OtherModuleDependencyTag(m) == commonOsToOsSpecificVariantTag {
if m.Enabled() {
variants = append(variants, m)
}
}
})
return variants
}
// archMutator splits a module into a variant for each Target requested by the module. Target selection
// for a module is in three levels, OsClass, mulitlib, and then Target.
// OsClass selection is determined by:
// - The HostOrDeviceSupported value passed in to InitAndroidArchModule by the module type factory, which selects
// whether the module type can compile for host, device or both.
// - The host_supported and device_supported properties on the module.
// If host is supported for the module, the Host and HostCross OsClasses are selected. If device is supported
// for the module, the Device OsClass is selected.
// Within each selected OsClass, the multilib selection is determined by:
// - The compile_multilib property if it set (which may be overridden by target.android.compile_multilib or
// target.host.compile_multilib).
// - The default multilib passed to InitAndroidArchModule if compile_multilib was not set.
// Valid multilib values include:
// "both": compile for all Targets supported by the OsClass (generally x86_64 and x86, or arm64 and arm).
// "first": compile for only a single preferred Target supported by the OsClass. This is generally x86_64 or arm64,
// but may be arm for a 32-bit only build.
// "32": compile for only a single 32-bit Target supported by the OsClass.
// "64": compile for only a single 64-bit Target supported by the OsClass.
// "common": compile a for a single Target that will work on all Targets suported by the OsClass (for example Java).
//
// Once the list of Targets is determined, the module is split into a variant for each Target.
//
// Modules can be initialized with InitAndroidMultiTargetsArchModule, in which case they will be split by OsClass,
// but will have a common Target that is expected to handle all other selected Targets via ctx.MultiTargets().
func archMutator(bpctx blueprint.BottomUpMutatorContext) {
var module Module
var ok bool
if module, ok = bpctx.Module().(Module); !ok {
if bootstrap.IsBootstrapModule(bpctx.Module()) {
// Bootstrap Go modules are always the build architecture.
bpctx.CreateVariations(bpctx.Config().(Config).BuildOSTarget.ArchVariation())
}
return
}
// Bootstrap Go module support above requires this mutator to be a
// blueprint.BottomUpMutatorContext because android.BottomUpMutatorContext
// filters out non-Soong modules. Now that we've handled them, create a
// normal android.BottomUpMutatorContext.
mctx := bottomUpMutatorContextFactory(bpctx, module, false)
base := module.base()
if !base.ArchSpecific() {
return
}
os := base.commonProperties.CompileOS
if os == CommonOS {
// Make sure that the target related properties are initialized for the
// CommonOS variant.
addTargetProperties(module, commonTargetMap[os.Name], nil, true)
// Do not create arch specific variants for the CommonOS variant.
return
}
osTargets := mctx.Config().Targets[os]
image := base.commonProperties.ImageVariation
// Filter NativeBridge targets unless they are explicitly supported
// Skip creating native bridge variants for vendor modules
if os == Android &&
!(Bool(base.commonProperties.Native_bridge_supported) && image == CoreVariation) {
var targets []Target
for _, t := range osTargets {
if !t.NativeBridge {
targets = append(targets, t)
}
}
osTargets = targets
}
// only the primary arch in the ramdisk / vendor_ramdisk / recovery partition
if os == Android && (module.InstallInRecovery() || module.InstallInRamdisk() || module.InstallInVendorRamdisk()) {
osTargets = []Target{osTargets[0]}
}
prefer32 := false
if base.prefer32 != nil {
prefer32 = base.prefer32(mctx, base, os)
}
multilib, extraMultilib := decodeMultilib(base, os.Class)
targets, err := decodeMultilibTargets(multilib, osTargets, prefer32)
if err != nil {
mctx.ModuleErrorf("%s", err.Error())
}
var multiTargets []Target
if extraMultilib != "" {
multiTargets, err = decodeMultilibTargets(extraMultilib, osTargets, prefer32)
if err != nil {
mctx.ModuleErrorf("%s", err.Error())
}
}
if image == RecoveryVariation {
primaryArch := mctx.Config().DevicePrimaryArchType()
targets = filterToArch(targets, primaryArch)
multiTargets = filterToArch(multiTargets, primaryArch)
}
if len(targets) == 0 {
base.Disable()
return
}
targetNames := make([]string, len(targets))
for i, target := range targets {
targetNames[i] = target.ArchVariation()
}
modules := mctx.CreateVariations(targetNames...)
for i, m := range modules {
addTargetProperties(m, targets[i], multiTargets, i == 0)
m.base().setArchProperties(mctx)
}
if multilib == "common_first" && len(modules) >= 2 {
for i := range modules[1:] {
mctx.AddInterVariantDependency(firstArchToCommonArchDepTag, modules[i+1], modules[0])
}
}
}
func addTargetProperties(m Module, target Target, multiTargets []Target, primaryTarget bool) {
m.base().commonProperties.CompileTarget = target
m.base().commonProperties.CompileMultiTargets = multiTargets
m.base().commonProperties.CompilePrimary = primaryTarget
}
func decodeMultilib(base *ModuleBase, class OsClass) (multilib, extraMultilib string) {
switch class {
case Device:
multilib = String(base.commonProperties.Target.Android.Compile_multilib)
case Host:
multilib = String(base.commonProperties.Target.Host.Compile_multilib)
}
if multilib == "" {
multilib = String(base.commonProperties.Compile_multilib)
}
if multilib == "" {
multilib = base.commonProperties.Default_multilib
}
if base.commonProperties.UseTargetVariants {
return multilib, ""
} else {
// For app modules a single arch variant will be created per OS class which is expected to handle all the
// selected arches. Return the common-type as multilib and any Android.bp provided multilib as extraMultilib
if multilib == base.commonProperties.Default_multilib {
multilib = "first"
}
return base.commonProperties.Default_multilib, multilib
}
}
func filterToArch(targets []Target, arch ArchType) []Target {
for i := 0; i < len(targets); i++ {
if targets[i].Arch.ArchType != arch {
targets = append(targets[:i], targets[i+1:]...)
i--
}
}
return targets
}
type archPropTypeDesc struct {
arch, multilib, target reflect.Type
}
type archPropRoot struct {
Arch, Multilib, Target interface{}
}
// createArchPropTypeDesc takes a reflect.Type that is either a struct or a pointer to a struct, and
// returns lists of reflect.Types that contains the arch-variant properties inside structs for each
// arch, multilib and target property.
func createArchPropTypeDesc(props reflect.Type) []archPropTypeDesc {
// Each property struct shard will be nested many times under the runtime generated arch struct,
// which can hit the limit of 64kB for the name of runtime generated structs. They are nested
// 97 times now, which may grow in the future, plus there is some overhead for the containing
// type. This number may need to be reduced if too many are added, but reducing it too far
// could cause problems if a single deeply nested property no longer fits in the name.
const maxArchTypeNameSize = 500
propShards, _ := proptools.FilterPropertyStructSharded(props, maxArchTypeNameSize, filterArchStruct)
if len(propShards) == 0 {
return nil
}
var ret []archPropTypeDesc
for _, props := range propShards {
variantFields := func(names []string) []reflect.StructField {
ret := make([]reflect.StructField, len(names))
for i, name := range names {
ret[i].Name = name
ret[i].Type = props
}
return ret
}
archFields := make([]reflect.StructField, len(archTypeList))
for i, arch := range archTypeList {
variants := []string{}
for _, archVariant := range archVariants[arch] {
archVariant := variantReplacer.Replace(archVariant)
variants = append(variants, proptools.FieldNameForProperty(archVariant))
}
for _, feature := range archFeatures[arch] {
feature := variantReplacer.Replace(feature)
variants = append(variants, proptools.FieldNameForProperty(feature))
}
fields := variantFields(variants)
fields = append([]reflect.StructField{{
Name: "BlueprintEmbed",
Type: props,
Anonymous: true,
}}, fields...)
archFields[i] = reflect.StructField{
Name: arch.Field,
Type: reflect.StructOf(fields),
}
}
archType := reflect.StructOf(archFields)
multilibType := reflect.StructOf(variantFields([]string{"Lib32", "Lib64"}))
targets := []string{
"Host",
"Android64",
"Android32",
"Bionic",
"Linux",
"Not_windows",
"Arm_on_x86",
"Arm_on_x86_64",
"Native_bridge",
}
for _, os := range OsTypeList {
targets = append(targets, os.Field)
for _, archType := range osArchTypeMap[os] {
targets = append(targets, os.Field+"_"+archType.Name)
if os.Linux() {
target := "Linux_" + archType.Name
if !InList(target, targets) {
targets = append(targets, target)
}
}
if os.Bionic() {
target := "Bionic_" + archType.Name
if !InList(target, targets) {
targets = append(targets, target)
}
}
}
}
targetType := reflect.StructOf(variantFields(targets))
ret = append(ret, archPropTypeDesc{
arch: reflect.PtrTo(archType),
multilib: reflect.PtrTo(multilibType),
target: reflect.PtrTo(targetType),
})
}
return ret
}
func filterArchStruct(field reflect.StructField, prefix string) (bool, reflect.StructField) {
if proptools.HasTag(field, "android", "arch_variant") {
// The arch_variant field isn't necessary past this point
// Instead of wasting space, just remove it. Go also has a
// 16-bit limit on structure name length. The name is constructed
// based on the Go source representation of the structure, so
// the tag names count towards that length.
androidTag := field.Tag.Get("android")
values := strings.Split(androidTag, ",")
if string(field.Tag) != `android:"`+strings.Join(values, ",")+`"` {
panic(fmt.Errorf("unexpected tag format %q", field.Tag))
}
// these tags don't need to be present in the runtime generated struct type.
values = RemoveListFromList(values, []string{"arch_variant", "variant_prepend", "path"})
if len(values) > 0 {
panic(fmt.Errorf("unknown tags %q in field %q", values, prefix+field.Name))
}
field.Tag = ""
return true, field
}
return false, field
}
var archPropTypeMap OncePer
func InitArchModule(m Module) {
base := m.base()
base.generalProperties = m.GetProperties()
for _, properties := range base.generalProperties {
propertiesValue := reflect.ValueOf(properties)
t := propertiesValue.Type()
if propertiesValue.Kind() != reflect.Ptr {
panic(fmt.Errorf("properties must be a pointer to a struct, got %T",
propertiesValue.Interface()))
}
propertiesValue = propertiesValue.Elem()
if propertiesValue.Kind() != reflect.Struct {
panic(fmt.Errorf("properties must be a pointer to a struct, got %T",
propertiesValue.Interface()))
}
archPropTypes := archPropTypeMap.Once(NewCustomOnceKey(t), func() interface{} {
return createArchPropTypeDesc(t)
}).([]archPropTypeDesc)
var archProperties []interface{}
for _, t := range archPropTypes {
archProperties = append(archProperties, &archPropRoot{
Arch: reflect.Zero(t.arch).Interface(),
Multilib: reflect.Zero(t.multilib).Interface(),
Target: reflect.Zero(t.target).Interface(),
})
}
base.archProperties = append(base.archProperties, archProperties)
m.AddProperties(archProperties...)
}
base.customizableProperties = m.GetProperties()
}
var variantReplacer = strings.NewReplacer("-", "_", ".", "_")
func (m *ModuleBase) appendProperties(ctx BottomUpMutatorContext,
dst interface{}, src reflect.Value, field, srcPrefix string) reflect.Value {
if src.Kind() == reflect.Ptr {
if src.IsNil() {
return src
}
src = src.Elem()
}
src = src.FieldByName(field)
if !src.IsValid() {
ctx.ModuleErrorf("field %q does not exist", srcPrefix)
return src
}
ret := src
if src.Kind() == reflect.Struct {
src = src.FieldByName("BlueprintEmbed")
}
order := func(property string,
dstField, srcField reflect.StructField,
dstValue, srcValue interface{}) (proptools.Order, error) {
if proptools.HasTag(dstField, "android", "variant_prepend") {
return proptools.Prepend, nil
} else {
return proptools.Append, nil
}
}
err := proptools.ExtendMatchingProperties([]interface{}{dst}, src.Interface(), nil, order)
if err != nil {
if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
ctx.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
} else {
panic(err)
}
}
return ret
}
// Rewrite the module's properties structs to contain os-specific values.
func (m *ModuleBase) setOSProperties(ctx BottomUpMutatorContext) {
os := m.commonProperties.CompileOS
for i := range m.generalProperties {
genProps := m.generalProperties[i]
if m.archProperties[i] == nil {
continue
}
for _, archProperties := range m.archProperties[i] {
archPropValues := reflect.ValueOf(archProperties).Elem()
targetProp := archPropValues.FieldByName("Target").Elem()
// Handle host-specific properties in the form:
// target: {
// host: {
// key: value,
// },
// },
if os.Class == Host {
field := "Host"
prefix := "target.host"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
// Handle target OS generalities of the form:
// target: {
// bionic: {
// key: value,
// },
// }
if os.Linux() {
field := "Linux"
prefix := "target.linux"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
if os.Bionic() {
field := "Bionic"
prefix := "target.bionic"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
// Handle target OS properties in the form:
// target: {
// linux_glibc: {
// key: value,
// },
// not_windows: {
// key: value,
// },
// android {
// key: value,
// },
// },
field := os.Field
prefix := "target." + os.Name
m.appendProperties(ctx, genProps, targetProp, field, prefix)
if os.Class == Host && os != Windows {
field := "Not_windows"
prefix := "target.not_windows"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
// Handle 64-bit device properties in the form:
// target {
// android64 {
// key: value,
// },
// android32 {
// key: value,
// },
// },
// WARNING: this is probably not what you want to use in your blueprints file, it selects
// options for all targets on a device that supports 64-bit binaries, not just the targets
// that are being compiled for 64-bit. Its expected use case is binaries like linker and
// debuggerd that need to know when they are a 32-bit process running on a 64-bit device
if os.Class == Device {
if ctx.Config().Android64() {
field := "Android64"
prefix := "target.android64"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
} else {
field := "Android32"
prefix := "target.android32"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
}
}
}
}
// Rewrite the module's properties structs to contain arch-specific values.
func (m *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
arch := m.Arch()
os := m.Os()
for i := range m.generalProperties {
genProps := m.generalProperties[i]
if m.archProperties[i] == nil {
continue
}
for _, archProperties := range m.archProperties[i] {
archPropValues := reflect.ValueOf(archProperties).Elem()
archProp := archPropValues.FieldByName("Arch").Elem()
multilibProp := archPropValues.FieldByName("Multilib").Elem()
targetProp := archPropValues.FieldByName("Target").Elem()
// Handle arch-specific properties in the form:
// arch: {
// arm64: {
// key: value,
// },
// },
t := arch.ArchType
if arch.ArchType != Common {
field := proptools.FieldNameForProperty(t.Name)
prefix := "arch." + t.Name
archStruct := m.appendProperties(ctx, genProps, archProp, field, prefix)
// Handle arch-variant-specific properties in the form:
// arch: {
// variant: {
// key: value,
// },
// },
v := variantReplacer.Replace(arch.ArchVariant)
if v != "" {
field := proptools.FieldNameForProperty(v)
prefix := "arch." + t.Name + "." + v
m.appendProperties(ctx, genProps, archStruct, field, prefix)
}
// Handle cpu-variant-specific properties in the form:
// arch: {
// variant: {
// key: value,
// },
// },
if arch.CpuVariant != arch.ArchVariant {
c := variantReplacer.Replace(arch.CpuVariant)
if c != "" {
field := proptools.FieldNameForProperty(c)
prefix := "arch." + t.Name + "." + c
m.appendProperties(ctx, genProps, archStruct, field, prefix)
}
}
// Handle arch-feature-specific properties in the form:
// arch: {
// feature: {
// key: value,
// },
// },
for _, feature := range arch.ArchFeatures {
field := proptools.FieldNameForProperty(feature)
prefix := "arch." + t.Name + "." + feature
m.appendProperties(ctx, genProps, archStruct, field, prefix)
}
// Handle multilib-specific properties in the form:
// multilib: {
// lib32: {
// key: value,
// },
// },
field = proptools.FieldNameForProperty(t.Multilib)
prefix = "multilib." + t.Multilib
m.appendProperties(ctx, genProps, multilibProp, field, prefix)
}
// Handle combined OS-feature and arch specific properties in the form:
// target: {
// bionic_x86: {
// key: value,
// },
// }
if os.Linux() && arch.ArchType != Common {
field := "Linux_" + arch.ArchType.Name
prefix := "target.linux_" + arch.ArchType.Name
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
if os.Bionic() && arch.ArchType != Common {
field := "Bionic_" + t.Name
prefix := "target.bionic_" + t.Name
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
// Handle combined OS and arch specific properties in the form:
// target: {
// linux_glibc_x86: {
// key: value,
// },
// linux_glibc_arm: {
// key: value,
// },
// android_arm {
// key: value,
// },
// android_x86 {
// key: value,
// },
// },
if arch.ArchType != Common {
field := os.Field + "_" + t.Name
prefix := "target." + os.Name + "_" + t.Name
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
// Handle arm on x86 properties in the form:
// target {
// arm_on_x86 {
// key: value,
// },
// arm_on_x86_64 {
// key: value,
// },
// },
if os.Class == Device {
if arch.ArchType == X86 && (hasArmAbi(arch) ||
hasArmAndroidArch(ctx.Config().Targets[Android])) {
field := "Arm_on_x86"
prefix := "target.arm_on_x86"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
if arch.ArchType == X86_64 && (hasArmAbi(arch) ||
hasArmAndroidArch(ctx.Config().Targets[Android])) {
field := "Arm_on_x86_64"
prefix := "target.arm_on_x86_64"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
if os == Android && m.Target().NativeBridge == NativeBridgeEnabled {
field := "Native_bridge"
prefix := "target.native_bridge"
m.appendProperties(ctx, genProps, targetProp, field, prefix)
}
}
}
}
}
func forEachInterface(v reflect.Value, f func(reflect.Value)) {
switch v.Kind() {
case reflect.Interface:
f(v)
case reflect.Struct:
for i := 0; i < v.NumField(); i++ {
forEachInterface(v.Field(i), f)
}
case reflect.Ptr:
forEachInterface(v.Elem(), f)
default:
panic(fmt.Errorf("Unsupported kind %s", v.Kind()))
}
}
// Convert the arch product variables into a list of targets for each os class structs
func decodeTargetProductVariables(config *config) (map[OsType][]Target, error) {
variables := config.productVariables
targets := make(map[OsType][]Target)
var targetErr error
addTarget := func(os OsType, archName string, archVariant, cpuVariant *string, abi []string,
nativeBridgeEnabled NativeBridgeSupport, nativeBridgeHostArchName *string,
nativeBridgeRelativePath *string) {
if targetErr != nil {
return
}
arch, err := decodeArch(os, archName, archVariant, cpuVariant, abi)
if err != nil {
targetErr = err
return
}
nativeBridgeRelativePathStr := String(nativeBridgeRelativePath)
nativeBridgeHostArchNameStr := String(nativeBridgeHostArchName)
// Use guest arch as relative install path by default
if nativeBridgeEnabled && nativeBridgeRelativePathStr == "" {
nativeBridgeRelativePathStr = arch.ArchType.String()
}
// A target is considered as HostCross if it's a host target which can't run natively on
// the currently configured build machine (either because the OS is different or because of
// the unsupported arch)
hostCross := false
if os.Class == Host {
var osSupported bool
if os == BuildOs {
osSupported = true
} else if BuildOs.Linux() && os.Linux() {
// LinuxBionic and Linux are compatible
osSupported = true
} else {
osSupported = false
}
var archSupported bool
if arch.ArchType == Common {
archSupported = true
} else if arch.ArchType.Name == *variables.HostArch {
archSupported = true
} else if variables.HostSecondaryArch != nil && arch.ArchType.Name == *variables.HostSecondaryArch {
archSupported = true
} else {
archSupported = false
}
if !osSupported || !archSupported {
hostCross = true
}
}
targets[os] = append(targets[os],
Target{
Os: os,
Arch: arch,
NativeBridge: nativeBridgeEnabled,
NativeBridgeHostArchName: nativeBridgeHostArchNameStr,
NativeBridgeRelativePath: nativeBridgeRelativePathStr,
HostCross: hostCross,
})
}
if variables.HostArch == nil {
return nil, fmt.Errorf("No host primary architecture set")
}
addTarget(BuildOs, *variables.HostArch, nil, nil, nil, NativeBridgeDisabled, nil, nil)
if variables.HostSecondaryArch != nil && *variables.HostSecondaryArch != "" {
addTarget(BuildOs, *variables.HostSecondaryArch, nil, nil, nil, NativeBridgeDisabled, nil, nil)
}
if Bool(config.Host_bionic) {
addTarget(LinuxBionic, "x86_64", nil, nil, nil, NativeBridgeDisabled, nil, nil)
}
if Bool(config.Host_bionic_arm64) {
addTarget(LinuxBionic, "arm64", nil, nil, nil, NativeBridgeDisabled, nil, nil)
}
if String(variables.CrossHost) != "" {
crossHostOs := osByName(*variables.CrossHost)
if crossHostOs == NoOsType {
return nil, fmt.Errorf("Unknown cross host OS %q", *variables.CrossHost)
}
if String(variables.CrossHostArch) == "" {
return nil, fmt.Errorf("No cross-host primary architecture set")
}
addTarget(crossHostOs, *variables.CrossHostArch, nil, nil, nil, NativeBridgeDisabled, nil, nil)
if variables.CrossHostSecondaryArch != nil && *variables.CrossHostSecondaryArch != "" {
addTarget(crossHostOs, *variables.CrossHostSecondaryArch, nil, nil, nil, NativeBridgeDisabled, nil, nil)
}
}
if variables.DeviceArch != nil && *variables.DeviceArch != "" {
var target = Android
if Bool(variables.Fuchsia) {
target = Fuchsia
}
addTarget(target, *variables.DeviceArch, variables.DeviceArchVariant,
variables.DeviceCpuVariant, variables.DeviceAbi, NativeBridgeDisabled, nil, nil)
if variables.DeviceSecondaryArch != nil && *variables.DeviceSecondaryArch != "" {
addTarget(Android, *variables.DeviceSecondaryArch,
variables.DeviceSecondaryArchVariant, variables.DeviceSecondaryCpuVariant,
variables.DeviceSecondaryAbi, NativeBridgeDisabled, nil, nil)
}
if variables.NativeBridgeArch != nil && *variables.NativeBridgeArch != "" {
addTarget(Android, *variables.NativeBridgeArch,
variables.NativeBridgeArchVariant, variables.NativeBridgeCpuVariant,
variables.NativeBridgeAbi, NativeBridgeEnabled, variables.DeviceArch,
variables.NativeBridgeRelativePath)
}
if variables.DeviceSecondaryArch != nil && *variables.DeviceSecondaryArch != "" &&
variables.NativeBridgeSecondaryArch != nil && *variables.NativeBridgeSecondaryArch != "" {
addTarget(Android, *variables.NativeBridgeSecondaryArch,
variables.NativeBridgeSecondaryArchVariant,
variables.NativeBridgeSecondaryCpuVariant,
variables.NativeBridgeSecondaryAbi,
NativeBridgeEnabled,
variables.DeviceSecondaryArch,
variables.NativeBridgeSecondaryRelativePath)
}
}
if targetErr != nil {
return nil, targetErr
}
return targets, nil
}
// hasArmAbi returns true if arch has at least one arm ABI
func hasArmAbi(arch Arch) bool {
return PrefixInList(arch.Abi, "arm")
}
// hasArmArch returns true if targets has at least non-native_bridge arm Android arch
func hasArmAndroidArch(targets []Target) bool {
for _, target := range targets {
if target.Os == Android && target.Arch.ArchType == Arm {
return true
}
}
return false
}
type archConfig struct {
arch string
archVariant string
cpuVariant string
abi []string
}
func getMegaDeviceConfig() []archConfig {
return []archConfig{
{"arm", "armv7-a", "generic", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "generic", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a7", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a8", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a9", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a15", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a53", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a53.a57", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a72", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a73", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a75", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "cortex-a76", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "krait", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "kryo", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "kryo385", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "exynos-m1", []string{"armeabi-v7a"}},
{"arm", "armv7-a-neon", "exynos-m2", []string{"armeabi-v7a"}},
{"arm64", "armv8-a", "cortex-a53", []string{"arm64-v8a"}},
{"arm64", "armv8-a", "cortex-a72", []string{"arm64-v8a"}},
{"arm64", "armv8-a", "cortex-a73", []string{"arm64-v8a"}},
{"arm64", "armv8-a", "kryo", []string{"arm64-v8a"}},
{"arm64", "armv8-a", "exynos-m1", []string{"arm64-v8a"}},
{"arm64", "armv8-a", "exynos-m2", []string{"arm64-v8a"}},
{"arm64", "armv8-2a", "kryo385", []string{"arm64-v8a"}},
{"arm64", "armv8-2a-dotprod", "cortex-a55", []string{"arm64-v8a"}},
{"arm64", "armv8-2a-dotprod", "cortex-a75", []string{"arm64-v8a"}},
{"arm64", "armv8-2a-dotprod", "cortex-a76", []string{"arm64-v8a"}},
{"x86", "", "", []string{"x86"}},
{"x86", "atom", "", []string{"x86"}},
{"x86", "haswell", "", []string{"x86"}},
{"x86", "ivybridge", "", []string{"x86"}},
{"x86", "sandybridge", "", []string{"x86"}},
{"x86", "silvermont", "", []string{"x86"}},
{"x86", "stoneyridge", "", []string{"x86"}},
{"x86", "x86_64", "", []string{"x86"}},
{"x86_64", "", "", []string{"x86_64"}},
{"x86_64", "haswell", "", []string{"x86_64"}},
{"x86_64", "ivybridge", "", []string{"x86_64"}},
{"x86_64", "sandybridge", "", []string{"x86_64"}},
{"x86_64", "silvermont", "", []string{"x86_64"}},
{"x86_64", "stoneyridge", "", []string{"x86_64"}},
}
}
func getNdkAbisConfig() []archConfig {
return []archConfig{
{"arm", "armv7-a", "", []string{"armeabi-v7a"}},
{"arm64", "armv8-a", "", []string{"arm64-v8a"}},
{"x86", "", "", []string{"x86"}},
{"x86_64", "", "", []string{"x86_64"}},
}
}
func getAmlAbisConfig() []archConfig {
return []archConfig{
{"arm", "armv7-a-neon", "", []string{"armeabi-v7a"}},
{"arm64", "armv8-a", "", []string{"arm64-v8a"}},
{"x86", "", "", []string{"x86"}},
{"x86_64", "", "", []string{"x86_64"}},
}
}
func decodeArchSettings(os OsType, archConfigs []archConfig) ([]Target, error) {
var ret []Target
for _, config := range archConfigs {
arch, err := decodeArch(os, config.arch, &config.archVariant,
&config.cpuVariant, config.abi)
if err != nil {
return nil, err
}
ret = append(ret, Target{
Os: Android,
Arch: arch,
})
}
return ret, nil
}
// Convert a set of strings from product variables into a single Arch struct
func decodeArch(os OsType, arch string, archVariant, cpuVariant *string, abi []string) (Arch, error) {
stringPtr := func(p *string) string {
if p != nil {
return *p
}
return ""
}
archType, ok := archTypeMap[arch]
if !ok {
return Arch{}, fmt.Errorf("unknown arch %q", arch)
}
a := Arch{
ArchType: archType,
ArchVariant: stringPtr(archVariant),
CpuVariant: stringPtr(cpuVariant),
Abi: abi,
}
if a.ArchVariant == a.ArchType.Name || a.ArchVariant == "generic" {
a.ArchVariant = ""
}
if a.CpuVariant == a.ArchType.Name || a.CpuVariant == "generic" {
a.CpuVariant = ""
}
for i := 0; i < len(a.Abi); i++ {
if a.Abi[i] == "" {
a.Abi = append(a.Abi[:i], a.Abi[i+1:]...)
i--
}
}
if a.ArchVariant == "" {
if featureMap, ok := defaultArchFeatureMap[os]; ok {
a.ArchFeatures = featureMap[archType]
}
} else {
if featureMap, ok := archFeatureMap[archType]; ok {
a.ArchFeatures = featureMap[a.ArchVariant]
}
}
return a, nil
}
func filterMultilibTargets(targets []Target, multilib string) []Target {
var ret []Target
for _, t := range targets {
if t.Arch.ArchType.Multilib == multilib {
ret = append(ret, t)
}
}
return ret
}
// Return the set of Os specific common architecture targets for each Os in a list of
// targets.
func getCommonTargets(targets []Target) []Target {
var ret []Target
set := make(map[string]bool)
for _, t := range targets {
if _, found := set[t.Os.String()]; !found {
set[t.Os.String()] = true
ret = append(ret, commonTargetMap[t.Os.String()])
}
}
return ret
}
func firstTarget(targets []Target, filters ...string) []Target {
// find the first target from each OS
var ret []Target
hasHost := false
set := make(map[OsType]bool)
for _, filter := range filters {
buildTargets := filterMultilibTargets(targets, filter)
for _, t := range buildTargets {
if _, found := set[t.Os]; !found {
hasHost = hasHost || (t.Os.Class == Host)
set[t.Os] = true
ret = append(ret, t)
}
}
}
return ret
}
// Use the module multilib setting to select one or more targets from a target list
func decodeMultilibTargets(multilib string, targets []Target, prefer32 bool) ([]Target, error) {
buildTargets := []Target{}
switch multilib {
case "common":
buildTargets = getCommonTargets(targets)
case "common_first":
buildTargets = getCommonTargets(targets)
if prefer32 {
buildTargets = append(buildTargets, firstTarget(targets, "lib32", "lib64")...)
} else {
buildTargets = append(buildTargets, firstTarget(targets, "lib64", "lib32")...)
}
case "both":
if prefer32 {
buildTargets = append(buildTargets, filterMultilibTargets(targets, "lib32")...)
buildTargets = append(buildTargets, filterMultilibTargets(targets, "lib64")...)
} else {
buildTargets = append(buildTargets, filterMultilibTargets(targets, "lib64")...)
buildTargets = append(buildTargets, filterMultilibTargets(targets, "lib32")...)
}
case "32":
buildTargets = filterMultilibTargets(targets, "lib32")
case "64":
buildTargets = filterMultilibTargets(targets, "lib64")
case "first":
if prefer32 {
buildTargets = firstTarget(targets, "lib32", "lib64")
} else {
buildTargets = firstTarget(targets, "lib64", "lib32")
}
case "prefer32":
buildTargets = filterMultilibTargets(targets, "lib32")
if len(buildTargets) == 0 {
buildTargets = filterMultilibTargets(targets, "lib64")
}
default:
return nil, fmt.Errorf(`compile_multilib must be "both", "first", "32", "64", or "prefer32" found %q`,
multilib)
}
return buildTargets, nil
}
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