cc/object.go - android_build_soong - Gitiles

 // Copyright 2016 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 cc

 import (
 	"fmt"
 	"strings"

 	"android/soong/android"
 	"android/soong/bazel"
 	"android/soong/bazel/cquery"
 )

 //
 // Objects (for crt*.o)
 //

 func init() {
 	android.RegisterModuleType("cc_object", ObjectFactory)
 	android.RegisterSdkMemberType(ccObjectSdkMemberType)

 }

 var ccObjectSdkMemberType = &librarySdkMemberType{
 	SdkMemberTypeBase: android.SdkMemberTypeBase{
 		PropertyName: "native_objects",
 		SupportsSdk:  true,
 	},
 	prebuiltModuleType: "cc_prebuilt_object",
 }

 type objectLinker struct {
 	*baseLinker
 	Properties ObjectLinkerProperties

 	// Location of the object in the sysroot. Empty if the object is not
 	// included in the NDK.
 	ndkSysrootPath android.Path
 }

 type objectBazelHandler struct {
 	module *Module
 }

 var _ BazelHandler = (*objectBazelHandler)(nil)

 func (handler *objectBazelHandler) QueueBazelCall(ctx android.BaseModuleContext, label string) {
 	bazelCtx := ctx.Config().BazelContext
 	bazelCtx.QueueBazelRequest(label, cquery.GetOutputFiles, android.GetConfigKeyApexVariant(ctx, GetApexConfigKey(ctx)))
 }

 func (handler *objectBazelHandler) ProcessBazelQueryResponse(ctx android.ModuleContext, label string) {
 	bazelCtx := ctx.Config().BazelContext
 	objPaths, err := bazelCtx.GetOutputFiles(label, android.GetConfigKeyApexVariant(ctx, GetApexConfigKey(ctx)))
 	if err != nil {
 		ctx.ModuleErrorf(err.Error())
 		return
 	}

 	if len(objPaths) != 1 {
 		ctx.ModuleErrorf("expected exactly one object file for '%s', but got %s", label, objPaths)
 		return
 	}

 	handler.module.outputFile = android.OptionalPathForPath(android.PathForBazelOut(ctx, objPaths[0]))
 }

 type ObjectLinkerProperties struct {
 	// list of static library modules that should only provide headers for this module.
 	Static_libs []string `android:"arch_variant,variant_prepend"`

 	// list of shared library modules should only provide headers for this module.
 	Shared_libs []string `android:"arch_variant,variant_prepend"`

 	// list of modules that should only provide headers for this module.
 	Header_libs []string `android:"arch_variant,variant_prepend"`

 	// list of default libraries that will provide headers for this module.  If unset, generally
 	// defaults to libc, libm, and libdl.  Set to [] to prevent using headers from the defaults.
 	System_shared_libs []string `android:"arch_variant"`

 	// names of other cc_object modules to link into this module using partial linking
 	Objs []string `android:"arch_variant"`

 	// if set, add an extra objcopy --prefix-symbols= step
 	Prefix_symbols *string

 	// if set, the path to a linker script to pass to ld -r when combining multiple object files.
 	Linker_script *string `android:"path,arch_variant"`

 	// Indicates that this module is a CRT object. CRT objects will be split
 	// into a variant per-API level between min_sdk_version and current.
 	Crt *bool

 	// Indicates that this module should not be included in the NDK sysroot.
 	// Only applies to CRT objects. Defaults to false.
 	Exclude_from_ndk_sysroot *bool
 }

 func newObject(hod android.HostOrDeviceSupported) *Module {
 	module := newBaseModule(hod, android.MultilibBoth)
 	module.sanitize = &sanitize{}
 	module.stl = &stl{}
 	return module
 }

 // cc_object runs the compiler without running the linker. It is rarely
 // necessary, but sometimes used to generate .s files from .c files to use as
 // input to a cc_genrule module.
 func ObjectFactory() android.Module {
 	module := newObject(android.HostAndDeviceSupported)
 	module.linker = &objectLinker{
 		baseLinker: NewBaseLinker(module.sanitize),
 	}
 	module.compiler = NewBaseCompiler()
 	module.bazelHandler = &objectBazelHandler{module: module}

 	// Clang's address-significance tables are incompatible with ld -r.
 	module.compiler.appendCflags([]string{"-fno-addrsig"})

 	module.sdkMemberTypes = []android.SdkMemberType{ccObjectSdkMemberType}

 	module.bazelable = true
 	return module.Init()
 }

 // For bp2build conversion.
 type bazelObjectAttributes struct {
 	Srcs                bazel.LabelListAttribute
 	Srcs_as             bazel.LabelListAttribute
 	Hdrs                bazel.LabelListAttribute
 	Objs                bazel.LabelListAttribute
 	Deps                bazel.LabelListAttribute
 	System_dynamic_deps bazel.LabelListAttribute
 	Copts               bazel.StringListAttribute
 	Asflags             bazel.StringListAttribute
 	Local_includes      bazel.StringListAttribute
 	Absolute_includes   bazel.StringListAttribute
 	Stl                 *string
 	Linker_script       bazel.LabelAttribute
 	Crt                 *bool
 	sdkAttributes
 }

 // objectBp2Build is the bp2build converter from cc_object modules to the
 // Bazel equivalent target, plus any necessary include deps for the cc_object.
 func objectBp2Build(ctx android.Bp2buildMutatorContext, m *Module) {
 	if m.compiler == nil {
 		// a cc_object must have access to the compiler decorator for its props.
 		ctx.ModuleErrorf("compiler must not be nil for a cc_object module")
 	}

 	// Set arch-specific configurable attributes
 	baseAttributes := bp2BuildParseBaseProps(ctx, m)
 	compilerAttrs := baseAttributes.compilerAttributes
 	var objs bazel.LabelListAttribute
 	var deps bazel.LabelListAttribute
 	systemDynamicDeps := bazel.LabelListAttribute{ForceSpecifyEmptyList: true}

 	var linkerScript bazel.LabelAttribute

 	for axis, configToProps := range m.GetArchVariantProperties(ctx, &ObjectLinkerProperties{}) {
 		for config, props := range configToProps {
 			if objectLinkerProps, ok := props.(*ObjectLinkerProperties); ok {
 				if objectLinkerProps.Linker_script != nil {
 					label := android.BazelLabelForModuleSrcSingle(ctx, *objectLinkerProps.Linker_script)
 					linkerScript.SetSelectValue(axis, config, label)
 				}
 				objs.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Objs))
 				systemSharedLibs := objectLinkerProps.System_shared_libs
 				if len(systemSharedLibs) > 0 {
 					systemSharedLibs = android.FirstUniqueStrings(systemSharedLibs)
 				}
 				systemDynamicDeps.SetSelectValue(axis, config, bazelLabelForSharedDeps(ctx, systemSharedLibs))
 				deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Static_libs))
 				deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Shared_libs))
 				deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Header_libs))
 				// static_libs, shared_libs, and header_libs have variant_prepend tag
 				deps.Prepend = true
 			}
 		}
 	}
 	objs.ResolveExcludes()

 	// Don't split cc_object srcs across languages. Doing so would add complexity,
 	// and this isn't typically done for cc_object.
 	srcs := compilerAttrs.srcs
 	srcs.Append(compilerAttrs.cSrcs)

 	asFlags := compilerAttrs.asFlags
 	if compilerAttrs.asSrcs.IsEmpty() {
 		// Skip asflags for BUILD file simplicity if there are no assembly sources.
 		asFlags = bazel.MakeStringListAttribute(nil)
 	}

 	attrs := &bazelObjectAttributes{
 		Srcs:                srcs,
 		Srcs_as:             compilerAttrs.asSrcs,
 		Objs:                objs,
 		Deps:                deps,
 		System_dynamic_deps: systemDynamicDeps,
 		Copts:               compilerAttrs.copts,
 		Asflags:             asFlags,
 		Local_includes:      compilerAttrs.localIncludes,
 		Absolute_includes:   compilerAttrs.absoluteIncludes,
 		Stl:                 compilerAttrs.stl,
 		Linker_script:       linkerScript,
 		Crt:                 m.linker.(*objectLinker).Properties.Crt,
 		sdkAttributes:       bp2BuildParseSdkAttributes(m),
 	}

 	props := bazel.BazelTargetModuleProperties{
 		Rule_class:        "cc_object",
 		Bzl_load_location: "//build/bazel/rules/cc:cc_object.bzl",
 	}

 	tags := android.ApexAvailableTagsWithoutTestApexes(ctx, m)

 	ctx.CreateBazelTargetModule(props, android.CommonAttributes{
 		Name: m.Name(),
 		Tags: tags,
 	}, attrs)
 }

 func (object *objectLinker) appendLdflags(flags []string) {
 	panic(fmt.Errorf("appendLdflags on objectLinker not supported"))
 }

 func (object *objectLinker) linkerProps() []interface{} {
 	return []interface{}{&object.Properties}
 }

 func (*objectLinker) linkerInit(ctx BaseModuleContext) {}

 func (object *objectLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
 	deps.HeaderLibs = append(deps.HeaderLibs, object.Properties.Header_libs...)
 	deps.SharedLibs = append(deps.SharedLibs, object.Properties.Shared_libs...)
 	deps.StaticLibs = append(deps.StaticLibs, object.Properties.Static_libs...)
 	deps.ObjFiles = append(deps.ObjFiles, object.Properties.Objs...)

 	deps.SystemSharedLibs = object.Properties.System_shared_libs
 	if deps.SystemSharedLibs == nil {
 		// Provide a default set of shared libraries if system_shared_libs is unspecified.
 		// Note: If an empty list [] is specified, it implies that the module declines the
 		// default shared libraries.
 		deps.SystemSharedLibs = append(deps.SystemSharedLibs, ctx.toolchain().DefaultSharedLibraries()...)
 	}
 	deps.LateSharedLibs = append(deps.LateSharedLibs, deps.SystemSharedLibs...)
 	return deps
 }

 func (object *objectLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
 	flags.Global.LdFlags = append(flags.Global.LdFlags, ctx.toolchain().ToolchainLdflags())

 	if lds := android.OptionalPathForModuleSrc(ctx, object.Properties.Linker_script); lds.Valid() {
 		flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-T,"+lds.String())
 		flags.LdFlagsDeps = append(flags.LdFlagsDeps, lds.Path())
 	}
 	return flags
 }

 func (object *objectLinker) link(ctx ModuleContext,
 	flags Flags, deps PathDeps, objs Objects) android.Path {

 	objs = objs.Append(deps.Objs)

 	var output android.WritablePath
 	builderFlags := flagsToBuilderFlags(flags)
 	outputName := ctx.ModuleName()
 	if !strings.HasSuffix(outputName, objectExtension) {
 		outputName += objectExtension
 	}

 	// isForPlatform is terribly named and actually means isNotApex.
 	if Bool(object.Properties.Crt) &&
 		!Bool(object.Properties.Exclude_from_ndk_sysroot) && ctx.useSdk() &&
 		ctx.isSdkVariant() && ctx.isForPlatform() {

 		output = getVersionedLibraryInstallPath(ctx,
 			nativeApiLevelOrPanic(ctx, ctx.sdkVersion())).Join(ctx, outputName)
 		object.ndkSysrootPath = output
 	} else {
 		output = android.PathForModuleOut(ctx, outputName)
 	}

 	outputFile := output

 	if len(objs.objFiles) == 1 && String(object.Properties.Linker_script) == "" {
 		if String(object.Properties.Prefix_symbols) != "" {
 			transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), objs.objFiles[0],
 				builderFlags, output)
 		} else {
 			ctx.Build(pctx, android.BuildParams{
 				Rule:   android.Cp,
 				Input:  objs.objFiles[0],
 				Output: output,
 			})
 		}
 	} else {
 		outputAddrSig := android.PathForModuleOut(ctx, "addrsig", outputName)

 		if String(object.Properties.Prefix_symbols) != "" {
 			input := android.PathForModuleOut(ctx, "unprefixed", outputName)
 			transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), input,
 				builderFlags, output)
 			output = input
 		}

 		transformObjsToObj(ctx, objs.objFiles, builderFlags, outputAddrSig, flags.LdFlagsDeps)

 		// ld -r reorders symbols and invalidates the .llvm_addrsig section, which then causes warnings
 		// if the resulting object is used with ld --icf=safe.  Strip the .llvm_addrsig section to
 		// prevent the warnings.
 		transformObjectNoAddrSig(ctx, outputAddrSig, output)
 	}

 	ctx.CheckbuildFile(outputFile)
 	return outputFile
 }

 func (object *objectLinker) linkerSpecifiedDeps(specifiedDeps specifiedDeps) specifiedDeps {
 	specifiedDeps.sharedLibs = append(specifiedDeps.sharedLibs, object.Properties.Shared_libs...)

 	// Must distinguish nil and [] in system_shared_libs - ensure that [] in
 	// either input list doesn't come out as nil.
 	if specifiedDeps.systemSharedLibs == nil {
 		specifiedDeps.systemSharedLibs = object.Properties.System_shared_libs
 	} else {
 		specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, object.Properties.System_shared_libs...)
 	}

 	return specifiedDeps
 }

 func (object *objectLinker) unstrippedOutputFilePath() android.Path {
 	return nil
 }

 func (object *objectLinker) nativeCoverage() bool {
 	return true
 }

 func (object *objectLinker) coverageOutputFilePath() android.OptionalPath {
 	return android.OptionalPath{}
 }

 func (object *objectLinker) object() bool {
 	return true
 }

 func (object *objectLinker) isCrt() bool {
 	return Bool(object.Properties.Crt)
 }
	// Copyright 2016 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 cc

	import (
	"fmt"
	"strings"

	"android/soong/android"
	"android/soong/bazel"
	"android/soong/bazel/cquery"
	)

	//
	// Objects (for crt*.o)
	//

	func init() {
	android.RegisterModuleType("cc_object", ObjectFactory)
	android.RegisterSdkMemberType(ccObjectSdkMemberType)

	}

	var ccObjectSdkMemberType = &librarySdkMemberType{
	SdkMemberTypeBase: android.SdkMemberTypeBase{
	PropertyName: "native_objects",
	SupportsSdk: true,
	},
	prebuiltModuleType: "cc_prebuilt_object",
	}

	type objectLinker struct {
	*baseLinker
	Properties ObjectLinkerProperties

	// Location of the object in the sysroot. Empty if the object is not
	// included in the NDK.
	ndkSysrootPath android.Path
	}

	type objectBazelHandler struct {
	module *Module
	}

	var _ BazelHandler = (*objectBazelHandler)(nil)

	func (handler *objectBazelHandler) QueueBazelCall(ctx android.BaseModuleContext, label string) {
	bazelCtx := ctx.Config().BazelContext
	bazelCtx.QueueBazelRequest(label, cquery.GetOutputFiles, android.GetConfigKeyApexVariant(ctx, GetApexConfigKey(ctx)))
	}

	func (handler *objectBazelHandler) ProcessBazelQueryResponse(ctx android.ModuleContext, label string) {
	bazelCtx := ctx.Config().BazelContext
	objPaths, err := bazelCtx.GetOutputFiles(label, android.GetConfigKeyApexVariant(ctx, GetApexConfigKey(ctx)))
	if err != nil {
	ctx.ModuleErrorf(err.Error())
	return
	}

	if len(objPaths) != 1 {
	ctx.ModuleErrorf("expected exactly one object file for '%s', but got %s", label, objPaths)
	return
	}

	handler.module.outputFile = android.OptionalPathForPath(android.PathForBazelOut(ctx, objPaths[0]))
	}

	type ObjectLinkerProperties struct {
	// list of static library modules that should only provide headers for this module.
	Static_libs []string `android:"arch_variant,variant_prepend"`

	// list of shared library modules should only provide headers for this module.
	Shared_libs []string `android:"arch_variant,variant_prepend"`

	// list of modules that should only provide headers for this module.
	Header_libs []string `android:"arch_variant,variant_prepend"`

	// list of default libraries that will provide headers for this module. If unset, generally
	// defaults to libc, libm, and libdl. Set to [] to prevent using headers from the defaults.
	System_shared_libs []string `android:"arch_variant"`

	// names of other cc_object modules to link into this module using partial linking
	Objs []string `android:"arch_variant"`

	// if set, add an extra objcopy --prefix-symbols= step
	Prefix_symbols *string

	// if set, the path to a linker script to pass to ld -r when combining multiple object files.
	Linker_script *string `android:"path,arch_variant"`

	// Indicates that this module is a CRT object. CRT objects will be split
	// into a variant per-API level between min_sdk_version and current.
	Crt *bool

	// Indicates that this module should not be included in the NDK sysroot.
	// Only applies to CRT objects. Defaults to false.
	Exclude_from_ndk_sysroot *bool
	}

	func newObject(hod android.HostOrDeviceSupported) *Module {
	module := newBaseModule(hod, android.MultilibBoth)
	module.sanitize = &sanitize{}
	module.stl = &stl{}
	return module
	}

	// cc_object runs the compiler without running the linker. It is rarely
	// necessary, but sometimes used to generate .s files from .c files to use as
	// input to a cc_genrule module.
	func ObjectFactory() android.Module {
	module := newObject(android.HostAndDeviceSupported)
	module.linker = &objectLinker{
	baseLinker: NewBaseLinker(module.sanitize),
	}
	module.compiler = NewBaseCompiler()
	module.bazelHandler = &objectBazelHandler{module: module}

	// Clang's address-significance tables are incompatible with ld -r.
	module.compiler.appendCflags([]string{"-fno-addrsig"})

	module.sdkMemberTypes = []android.SdkMemberType{ccObjectSdkMemberType}

	module.bazelable = true
	return module.Init()
	}

	// For bp2build conversion.
	type bazelObjectAttributes struct {
	Srcs bazel.LabelListAttribute
	Srcs_as bazel.LabelListAttribute
	Hdrs bazel.LabelListAttribute
	Objs bazel.LabelListAttribute
	Deps bazel.LabelListAttribute
	System_dynamic_deps bazel.LabelListAttribute
	Copts bazel.StringListAttribute
	Asflags bazel.StringListAttribute
	Local_includes bazel.StringListAttribute
	Absolute_includes bazel.StringListAttribute
	Stl *string
	Linker_script bazel.LabelAttribute
	Crt *bool
	sdkAttributes
	}

	// objectBp2Build is the bp2build converter from cc_object modules to the
	// Bazel equivalent target, plus any necessary include deps for the cc_object.
	func objectBp2Build(ctx android.Bp2buildMutatorContext, m *Module) {
	if m.compiler == nil {
	// a cc_object must have access to the compiler decorator for its props.
	ctx.ModuleErrorf("compiler must not be nil for a cc_object module")
	}

	// Set arch-specific configurable attributes
	baseAttributes := bp2BuildParseBaseProps(ctx, m)
	compilerAttrs := baseAttributes.compilerAttributes
	var objs bazel.LabelListAttribute
	var deps bazel.LabelListAttribute
	systemDynamicDeps := bazel.LabelListAttribute{ForceSpecifyEmptyList: true}

	var linkerScript bazel.LabelAttribute

	for axis, configToProps := range m.GetArchVariantProperties(ctx, &ObjectLinkerProperties{}) {
	for config, props := range configToProps {
	if objectLinkerProps, ok := props.(*ObjectLinkerProperties); ok {
	if objectLinkerProps.Linker_script != nil {
	label := android.BazelLabelForModuleSrcSingle(ctx, *objectLinkerProps.Linker_script)
	linkerScript.SetSelectValue(axis, config, label)
	}
	objs.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Objs))
	systemSharedLibs := objectLinkerProps.System_shared_libs
	if len(systemSharedLibs) > 0 {
	systemSharedLibs = android.FirstUniqueStrings(systemSharedLibs)
	}
	systemDynamicDeps.SetSelectValue(axis, config, bazelLabelForSharedDeps(ctx, systemSharedLibs))
	deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Static_libs))
	deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Shared_libs))
	deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, objectLinkerProps.Header_libs))
	// static_libs, shared_libs, and header_libs have variant_prepend tag
	deps.Prepend = true
	}
	}
	}
	objs.ResolveExcludes()

	// Don't split cc_object srcs across languages. Doing so would add complexity,
	// and this isn't typically done for cc_object.
	srcs := compilerAttrs.srcs
	srcs.Append(compilerAttrs.cSrcs)

	asFlags := compilerAttrs.asFlags
	if compilerAttrs.asSrcs.IsEmpty() {
	// Skip asflags for BUILD file simplicity if there are no assembly sources.
	asFlags = bazel.MakeStringListAttribute(nil)
	}

	attrs := &bazelObjectAttributes{
	Srcs: srcs,
	Srcs_as: compilerAttrs.asSrcs,
	Objs: objs,
	Deps: deps,
	System_dynamic_deps: systemDynamicDeps,
	Copts: compilerAttrs.copts,
	Asflags: asFlags,
	Local_includes: compilerAttrs.localIncludes,
	Absolute_includes: compilerAttrs.absoluteIncludes,
	Stl: compilerAttrs.stl,
	Linker_script: linkerScript,
	Crt: m.linker.(*objectLinker).Properties.Crt,
	sdkAttributes: bp2BuildParseSdkAttributes(m),
	}

	props := bazel.BazelTargetModuleProperties{
	Rule_class: "cc_object",
	Bzl_load_location: "//build/bazel/rules/cc:cc_object.bzl",
	}

	tags := android.ApexAvailableTagsWithoutTestApexes(ctx, m)

	ctx.CreateBazelTargetModule(props, android.CommonAttributes{
	Name: m.Name(),
	Tags: tags,
	}, attrs)
	}

	func (object *objectLinker) appendLdflags(flags []string) {
	panic(fmt.Errorf("appendLdflags on objectLinker not supported"))
	}

	func (object *objectLinker) linkerProps() []interface{} {
	return []interface{}{&object.Properties}
	}

	func (*objectLinker) linkerInit(ctx BaseModuleContext) {}

	func (object *objectLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
	deps.HeaderLibs = append(deps.HeaderLibs, object.Properties.Header_libs...)
	deps.SharedLibs = append(deps.SharedLibs, object.Properties.Shared_libs...)
	deps.StaticLibs = append(deps.StaticLibs, object.Properties.Static_libs...)
	deps.ObjFiles = append(deps.ObjFiles, object.Properties.Objs...)

	deps.SystemSharedLibs = object.Properties.System_shared_libs
	if deps.SystemSharedLibs == nil {
	// Provide a default set of shared libraries if system_shared_libs is unspecified.
	// Note: If an empty list [] is specified, it implies that the module declines the
	// default shared libraries.
	deps.SystemSharedLibs = append(deps.SystemSharedLibs, ctx.toolchain().DefaultSharedLibraries()...)
	}
	deps.LateSharedLibs = append(deps.LateSharedLibs, deps.SystemSharedLibs...)
	return deps
	}

	func (object *objectLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
	flags.Global.LdFlags = append(flags.Global.LdFlags, ctx.toolchain().ToolchainLdflags())

	if lds := android.OptionalPathForModuleSrc(ctx, object.Properties.Linker_script); lds.Valid() {
	flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-T,"+lds.String())
	flags.LdFlagsDeps = append(flags.LdFlagsDeps, lds.Path())
	}
	return flags
	}

	func (object *objectLinker) link(ctx ModuleContext,
	flags Flags, deps PathDeps, objs Objects) android.Path {

	objs = objs.Append(deps.Objs)

	var output android.WritablePath
	builderFlags := flagsToBuilderFlags(flags)
	outputName := ctx.ModuleName()
	if !strings.HasSuffix(outputName, objectExtension) {
	outputName += objectExtension
	}

	// isForPlatform is terribly named and actually means isNotApex.
	if Bool(object.Properties.Crt) &&
	!Bool(object.Properties.Exclude_from_ndk_sysroot) && ctx.useSdk() &&
	ctx.isSdkVariant() && ctx.isForPlatform() {

	output = getVersionedLibraryInstallPath(ctx,
	nativeApiLevelOrPanic(ctx, ctx.sdkVersion())).Join(ctx, outputName)
	object.ndkSysrootPath = output
	} else {
	output = android.PathForModuleOut(ctx, outputName)
	}

	outputFile := output

	if len(objs.objFiles) == 1 && String(object.Properties.Linker_script) == "" {
	if String(object.Properties.Prefix_symbols) != "" {
	transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), objs.objFiles[0],
	builderFlags, output)
	} else {
	ctx.Build(pctx, android.BuildParams{
	Rule: android.Cp,
	Input: objs.objFiles[0],
	Output: output,
	})
	}
	} else {
	outputAddrSig := android.PathForModuleOut(ctx, "addrsig", outputName)

	if String(object.Properties.Prefix_symbols) != "" {
	input := android.PathForModuleOut(ctx, "unprefixed", outputName)
	transformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), input,
	builderFlags, output)
	output = input
	}

	transformObjsToObj(ctx, objs.objFiles, builderFlags, outputAddrSig, flags.LdFlagsDeps)

	// ld -r reorders symbols and invalidates the .llvm_addrsig section, which then causes warnings
	// if the resulting object is used with ld --icf=safe. Strip the .llvm_addrsig section to
	// prevent the warnings.
	transformObjectNoAddrSig(ctx, outputAddrSig, output)
	}

	ctx.CheckbuildFile(outputFile)
	return outputFile
	}

	func (object *objectLinker) linkerSpecifiedDeps(specifiedDeps specifiedDeps) specifiedDeps {
	specifiedDeps.sharedLibs = append(specifiedDeps.sharedLibs, object.Properties.Shared_libs...)

	// Must distinguish nil and [] in system_shared_libs - ensure that [] in
	// either input list doesn't come out as nil.
	if specifiedDeps.systemSharedLibs == nil {
	specifiedDeps.systemSharedLibs = object.Properties.System_shared_libs
	} else {
	specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, object.Properties.System_shared_libs...)
	}

	return specifiedDeps
	}

	func (object *objectLinker) unstrippedOutputFilePath() android.Path {
	return nil
	}

	func (object *objectLinker) nativeCoverage() bool {
	return true
	}

	func (object *objectLinker) coverageOutputFilePath() android.OptionalPath {
	return android.OptionalPath{}
	}

	func (object *objectLinker) object() bool {
	return true
	}

	func (object *objectLinker) isCrt() bool {
	return Bool(object.Properties.Crt)
	}