Merge changes from topic "soong_build_number_file"

* changes:
  Add an order-only dependency on the build number file
  Add support for order-only dependencies to RuleBuilder
diff --git a/Android.bp b/Android.bp
index 2a4653a..0621475 100644
--- a/Android.bp
+++ b/Android.bp
@@ -207,6 +207,7 @@
         "cc/binary_sdk_member.go",
         "cc/fuzz.go",
         "cc/library.go",
+        "cc/library_headers.go",
         "cc/library_sdk_member.go",
         "cc/object.go",
         "cc/test.go",
@@ -232,6 +233,7 @@
         "cc/compiler_test.go",
         "cc/gen_test.go",
         "cc/genrule_test.go",
+        "cc/library_headers_test.go",
         "cc/library_test.go",
         "cc/object_test.go",
         "cc/prebuilt_test.go",
@@ -534,6 +536,7 @@
         "sdk/update.go",
     ],
     testSrcs: [
+        "sdk/bp_test.go",
         "sdk/cc_sdk_test.go",
         "sdk/exports_test.go",
         "sdk/java_sdk_test.go",
diff --git a/android/androidmk.go b/android/androidmk.go
index dbf3aa8..a8153cc 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -236,8 +236,8 @@
 		}
 	}
 
-	if amod.noticeFile.Valid() {
-		a.SetString("LOCAL_NOTICE_FILE", amod.noticeFile.String())
+	if len(amod.noticeFiles) > 0 {
+		a.SetString("LOCAL_NOTICE_FILE", strings.Join(amod.noticeFiles.Strings(), " "))
 	}
 
 	if host {
diff --git a/android/module.go b/android/module.go
index fd3fec3..1026bdf 100644
--- a/android/module.go
+++ b/android/module.go
@@ -172,6 +172,7 @@
 	InstallInRecovery() bool
 	InstallInRoot() bool
 	InstallBypassMake() bool
+	InstallForceOS() *OsType
 
 	RequiredModuleNames() []string
 	HostRequiredModuleNames() []string
@@ -214,11 +215,12 @@
 	InstallInRecovery() bool
 	InstallInRoot() bool
 	InstallBypassMake() bool
+	InstallForceOS() *OsType
 	SkipInstall()
 	ExportedToMake() bool
 	InitRc() Paths
 	VintfFragments() Paths
-	NoticeFile() OptionalPath
+	NoticeFiles() Paths
 
 	AddProperties(props ...interface{})
 	GetProperties() []interface{}
@@ -242,6 +244,8 @@
 	RequiredModuleNames() []string
 	HostRequiredModuleNames() []string
 	TargetRequiredModuleNames() []string
+
+	filesToInstall() InstallPaths
 }
 
 // Qualified id for a module
@@ -643,9 +647,9 @@
 	primaryVisibilityProperty visibilityProperty
 
 	noAddressSanitizer bool
-	installFiles       Paths
+	installFiles       InstallPaths
 	checkbuildFiles    Paths
-	noticeFile         OptionalPath
+	noticeFiles        Paths
 
 	// Used by buildTargetSingleton to create checkbuild and per-directory build targets
 	// Only set on the final variant of each module
@@ -849,22 +853,20 @@
 	return m.commonProperties.NamespaceExportedToMake
 }
 
-func (m *ModuleBase) computeInstallDeps(
-	ctx blueprint.ModuleContext) Paths {
+func (m *ModuleBase) computeInstallDeps(ctx blueprint.ModuleContext) InstallPaths {
 
-	result := Paths{}
+	var result InstallPaths
 	// TODO(ccross): we need to use WalkDeps and have some way to know which dependencies require installation
-	ctx.VisitDepsDepthFirstIf(isFileInstaller,
-		func(m blueprint.Module) {
-			fileInstaller := m.(fileInstaller)
-			files := fileInstaller.filesToInstall()
-			result = append(result, files...)
-		})
+	ctx.VisitDepsDepthFirst(func(m blueprint.Module) {
+		if a, ok := m.(Module); ok {
+			result = append(result, a.filesToInstall()...)
+		}
+	})
 
 	return result
 }
 
-func (m *ModuleBase) filesToInstall() Paths {
+func (m *ModuleBase) filesToInstall() InstallPaths {
 	return m.installFiles
 }
 
@@ -900,12 +902,16 @@
 	return false
 }
 
+func (m *ModuleBase) InstallForceOS() *OsType {
+	return nil
+}
+
 func (m *ModuleBase) Owner() string {
 	return String(m.commonProperties.Owner)
 }
 
-func (m *ModuleBase) NoticeFile() OptionalPath {
-	return m.noticeFile
+func (m *ModuleBase) NoticeFiles() Paths {
+	return m.noticeFiles
 }
 
 func (m *ModuleBase) setImageVariation(variant string) {
@@ -948,8 +954,8 @@
 }
 
 func (m *ModuleBase) generateModuleTarget(ctx ModuleContext) {
-	allInstalledFiles := Paths{}
-	allCheckbuildFiles := Paths{}
+	var allInstalledFiles InstallPaths
+	var allCheckbuildFiles Paths
 	ctx.VisitAllModuleVariants(func(module Module) {
 		a := module.base()
 		allInstalledFiles = append(allInstalledFiles, a.installFiles...)
@@ -968,7 +974,7 @@
 		ctx.Build(pctx, BuildParams{
 			Rule:      blueprint.Phony,
 			Output:    name,
-			Implicits: allInstalledFiles,
+			Implicits: allInstalledFiles.Paths(),
 			Default:   !ctx.Config().EmbeddedInMake(),
 		})
 		deps = append(deps, name)
@@ -1151,12 +1157,25 @@
 			}
 		})
 
-		notice := proptools.StringDefault(m.commonProperties.Notice, "NOTICE")
+		m.noticeFiles = make([]Path, 0)
+		optPath := OptionalPath{}
+		notice := proptools.StringDefault(m.commonProperties.Notice, "")
 		if module := SrcIsModule(notice); module != "" {
-			m.noticeFile = ctx.ExpandOptionalSource(&notice, "notice")
-		} else {
+			optPath = ctx.ExpandOptionalSource(&notice, "notice")
+		} else if notice != "" {
 			noticePath := filepath.Join(ctx.ModuleDir(), notice)
-			m.noticeFile = ExistentPathForSource(ctx, noticePath)
+			optPath = ExistentPathForSource(ctx, noticePath)
+		}
+		if optPath.Valid() {
+			m.noticeFiles = append(m.noticeFiles, optPath.Path())
+		} else {
+			for _, notice = range []string{"LICENSE", "LICENCE", "NOTICE"} {
+				noticePath := filepath.Join(ctx.ModuleDir(), notice)
+				optPath = ExistentPathForSource(ctx, noticePath)
+				if optPath.Valid() {
+					m.noticeFiles = append(m.noticeFiles, optPath.Path())
+				}
+			}
 		}
 
 		m.module.GenerateAndroidBuildActions(ctx)
@@ -1281,7 +1300,7 @@
 func (b *baseModuleContext) OtherModuleName(m blueprint.Module) string { return b.bp.OtherModuleName(m) }
 func (b *baseModuleContext) OtherModuleDir(m blueprint.Module) string  { return b.bp.OtherModuleDir(m) }
 func (b *baseModuleContext) OtherModuleErrorf(m blueprint.Module, fmt string, args ...interface{}) {
-	b.bp.OtherModuleErrorf(m, fmt, args)
+	b.bp.OtherModuleErrorf(m, fmt, args...)
 }
 func (b *baseModuleContext) OtherModuleDependencyTag(m blueprint.Module) blueprint.DependencyTag {
 	return b.bp.OtherModuleDependencyTag(m)
@@ -1296,8 +1315,8 @@
 type moduleContext struct {
 	bp blueprint.ModuleContext
 	baseModuleContext
-	installDeps     Paths
-	installFiles    Paths
+	installDeps     InstallPaths
+	installFiles    InstallPaths
 	checkbuildFiles Paths
 	module          Module
 
@@ -1703,6 +1722,10 @@
 	return m.module.InstallBypassMake()
 }
 
+func (m *moduleContext) InstallForceOS() *OsType {
+	return m.module.InstallForceOS()
+}
+
 func (m *moduleContext) skipInstall(fullInstallPath InstallPath) bool {
 	if m.module.base().commonProperties.SkipInstall {
 		return true
@@ -1746,7 +1769,7 @@
 
 	if !m.skipInstall(fullInstallPath) {
 
-		deps = append(deps, m.installDeps...)
+		deps = append(deps, m.installDeps.Paths()...)
 
 		var implicitDeps, orderOnlyDeps Paths
 
@@ -1827,20 +1850,6 @@
 	m.checkbuildFiles = append(m.checkbuildFiles, srcPath)
 }
 
-type fileInstaller interface {
-	filesToInstall() Paths
-}
-
-func isFileInstaller(m blueprint.Module) bool {
-	_, ok := m.(fileInstaller)
-	return ok
-}
-
-func isAndroidModule(m blueprint.Module) bool {
-	_, ok := m.(Module)
-	return ok
-}
-
 func findStringInSlice(str string, slice []string) int {
 	for i, s := range slice {
 		if s == str {
diff --git a/android/paths.go b/android/paths.go
index 66725c6..8b373da 100644
--- a/android/paths.go
+++ b/android/paths.go
@@ -53,6 +53,7 @@
 	InstallInRecovery() bool
 	InstallInRoot() bool
 	InstallBypassMake() bool
+	InstallForceOS() *OsType
 }
 
 var _ ModuleInstallPathContext = ModuleContext(nil)
@@ -1205,22 +1206,40 @@
 // PathForModuleInstall returns a Path representing the install path for the
 // module appended with paths...
 func PathForModuleInstall(ctx ModuleInstallPathContext, pathComponents ...string) InstallPath {
+	os := ctx.Os()
+	if forceOS := ctx.InstallForceOS(); forceOS != nil {
+		os = *forceOS
+	}
+	partition := modulePartition(ctx, os)
+
+	ret := pathForInstall(ctx, os, partition, ctx.Debug(), pathComponents...)
+
+	if ctx.InstallBypassMake() && ctx.Config().EmbeddedInMake() {
+		ret = ret.ToMakePath()
+	}
+
+	return ret
+}
+
+func pathForInstall(ctx PathContext, os OsType, partition string, debug bool,
+	pathComponents ...string) InstallPath {
+
 	var outPaths []string
-	if ctx.Device() {
-		partition := modulePartition(ctx)
+
+	if os.Class == Device {
 		outPaths = []string{"target", "product", ctx.Config().DeviceName(), partition}
 	} else {
-		switch ctx.Os() {
+		switch os {
 		case Linux:
-			outPaths = []string{"host", "linux-x86"}
+			outPaths = []string{"host", "linux-x86", partition}
 		case LinuxBionic:
 			// TODO: should this be a separate top level, or shared with linux-x86?
-			outPaths = []string{"host", "linux_bionic-x86"}
+			outPaths = []string{"host", "linux_bionic-x86", partition}
 		default:
-			outPaths = []string{"host", ctx.Os().String() + "-x86"}
+			outPaths = []string{"host", os.String() + "-x86", partition}
 		}
 	}
-	if ctx.Debug() {
+	if debug {
 		outPaths = append([]string{"debug"}, outPaths...)
 	}
 	outPaths = append(outPaths, pathComponents...)
@@ -1231,9 +1250,6 @@
 	}
 
 	ret := InstallPath{basePath{path, ctx.Config(), ""}, ""}
-	if ctx.InstallBypassMake() && ctx.Config().EmbeddedInMake() {
-		ret = ret.ToMakePath()
-	}
 
 	return ret
 }
@@ -1253,47 +1269,76 @@
 	return "/" + rel
 }
 
-func modulePartition(ctx ModuleInstallPathContext) string {
+func modulePartition(ctx ModuleInstallPathContext, os OsType) string {
 	var partition string
-	if ctx.InstallInData() {
-		partition = "data"
-	} else if ctx.InstallInTestcases() {
+	if ctx.InstallInTestcases() {
+		// "testcases" install directory can be used for host or device modules.
 		partition = "testcases"
-	} else if ctx.InstallInRamdisk() {
-		if ctx.DeviceConfig().BoardUsesRecoveryAsBoot() {
-			partition = "recovery/root/first_stage_ramdisk"
+	} else if os.Class == Device {
+		if ctx.InstallInData() {
+			partition = "data"
+		} else if ctx.InstallInRamdisk() {
+			if ctx.DeviceConfig().BoardUsesRecoveryAsBoot() {
+				partition = "recovery/root/first_stage_ramdisk"
+			} else {
+				partition = "ramdisk"
+			}
+			if !ctx.InstallInRoot() {
+				partition += "/system"
+			}
+		} else if ctx.InstallInRecovery() {
+			if ctx.InstallInRoot() {
+				partition = "recovery/root"
+			} else {
+				// the layout of recovery partion is the same as that of system partition
+				partition = "recovery/root/system"
+			}
+		} else if ctx.SocSpecific() {
+			partition = ctx.DeviceConfig().VendorPath()
+		} else if ctx.DeviceSpecific() {
+			partition = ctx.DeviceConfig().OdmPath()
+		} else if ctx.ProductSpecific() {
+			partition = ctx.DeviceConfig().ProductPath()
+		} else if ctx.SystemExtSpecific() {
+			partition = ctx.DeviceConfig().SystemExtPath()
+		} else if ctx.InstallInRoot() {
+			partition = "root"
 		} else {
-			partition = "ramdisk"
+			partition = "system"
 		}
-		if !ctx.InstallInRoot() {
-			partition += "/system"
+		if ctx.InstallInSanitizerDir() {
+			partition = "data/asan/" + partition
 		}
-	} else if ctx.InstallInRecovery() {
-		if ctx.InstallInRoot() {
-			partition = "recovery/root"
-		} else {
-			// the layout of recovery partion is the same as that of system partition
-			partition = "recovery/root/system"
-		}
-	} else if ctx.SocSpecific() {
-		partition = ctx.DeviceConfig().VendorPath()
-	} else if ctx.DeviceSpecific() {
-		partition = ctx.DeviceConfig().OdmPath()
-	} else if ctx.ProductSpecific() {
-		partition = ctx.DeviceConfig().ProductPath()
-	} else if ctx.SystemExtSpecific() {
-		partition = ctx.DeviceConfig().SystemExtPath()
-	} else if ctx.InstallInRoot() {
-		partition = "root"
-	} else {
-		partition = "system"
-	}
-	if ctx.InstallInSanitizerDir() {
-		partition = "data/asan/" + partition
 	}
 	return partition
 }
 
+type InstallPaths []InstallPath
+
+// Paths returns the InstallPaths as a Paths
+func (p InstallPaths) Paths() Paths {
+	if p == nil {
+		return nil
+	}
+	ret := make(Paths, len(p))
+	for i, path := range p {
+		ret[i] = path
+	}
+	return ret
+}
+
+// Strings returns the string forms of the install paths.
+func (p InstallPaths) Strings() []string {
+	if p == nil {
+		return nil
+	}
+	ret := make([]string, len(p))
+	for i, path := range p {
+		ret[i] = path.String()
+	}
+	return ret
+}
+
 // validateSafePath validates a path that we trust (may contain ninja variables).
 // Ensures that each path component does not attempt to leave its component.
 func validateSafePath(pathComponents ...string) (string, error) {
diff --git a/android/paths_test.go b/android/paths_test.go
index 7a32026..f1908ac 100644
--- a/android/paths_test.go
+++ b/android/paths_test.go
@@ -205,6 +205,7 @@
 	inRamdisk      bool
 	inRecovery     bool
 	inRoot         bool
+	forceOS        *OsType
 }
 
 func (m moduleInstallPathContextImpl) Config() Config {
@@ -241,6 +242,10 @@
 	return false
 }
 
+func (m moduleInstallPathContextImpl) InstallForceOS() *OsType {
+	return m.forceOS
+}
+
 func pathTestConfig(buildDir string) Config {
 	return TestConfig(buildDir, nil, "", nil)
 }
@@ -598,6 +603,40 @@
 			},
 			in:  []string{"nativetest", "my_test"},
 			out: "target/product/test_device/data/asan/data/nativetest/my_test",
+		}, {
+			name: "device testcases",
+			ctx: &moduleInstallPathContextImpl{
+				baseModuleContext: baseModuleContext{
+					os:     deviceTarget.Os,
+					target: deviceTarget,
+				},
+				inTestcases: true,
+			},
+			in:  []string{"my_test", "my_test_bin"},
+			out: "target/product/test_device/testcases/my_test/my_test_bin",
+		}, {
+			name: "host testcases",
+			ctx: &moduleInstallPathContextImpl{
+				baseModuleContext: baseModuleContext{
+					os:     hostTarget.Os,
+					target: hostTarget,
+				},
+				inTestcases: true,
+			},
+			in:  []string{"my_test", "my_test_bin"},
+			out: "host/linux-x86/testcases/my_test/my_test_bin",
+		}, {
+			name: "forced host testcases",
+			ctx: &moduleInstallPathContextImpl{
+				baseModuleContext: baseModuleContext{
+					os:     deviceTarget.Os,
+					target: deviceTarget,
+				},
+				inTestcases: true,
+				forceOS:     &Linux,
+			},
+			in:  []string{"my_test", "my_test_bin"},
+			out: "host/linux-x86/testcases/my_test/my_test_bin",
 		},
 	}
 
diff --git a/apex/androidmk.go b/apex/androidmk.go
index 0abec0d..5c15e8e 100644
--- a/apex/androidmk.go
+++ b/apex/androidmk.go
@@ -120,8 +120,8 @@
 				fmt.Fprintln(w, "LOCAL_MODULE_SYMLINKS :=", strings.Join(fi.symlinks, " "))
 			}
 
-			if fi.module != nil && fi.module.NoticeFile().Valid() {
-				fmt.Fprintln(w, "LOCAL_NOTICE_FILE :=", fi.module.NoticeFile().Path().String())
+			if fi.module != nil && len(fi.module.NoticeFiles()) > 0 {
+				fmt.Fprintln(w, "LOCAL_NOTICE_FILE :=", strings.Join(fi.module.NoticeFiles().Strings(), " "))
 			}
 		} else {
 			fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", pathWhenActivated)
@@ -308,7 +308,7 @@
 				}
 
 				if a.installedFilesFile != nil {
-					goal := "droidcore"
+					goal := "checkbuild"
 					distFile := name + "-installed-files.txt"
 					fmt.Fprintln(w, ".PHONY:", goal)
 					fmt.Fprintf(w, "$(call dist-for-goals,%s,%s:%s)\n",
diff --git a/apex/apex.go b/apex/apex.go
index 42cc9a6..c791162 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -52,6 +52,7 @@
 
 var (
 	sharedLibTag   = dependencyTag{name: "sharedLib", payload: true}
+	jniLibTag      = dependencyTag{name: "jniLib", payload: true}
 	executableTag  = dependencyTag{name: "executable", payload: true}
 	javaLibTag     = dependencyTag{name: "javaLib", payload: true}
 	prebuiltTag    = dependencyTag{name: "prebuilt", payload: true}
@@ -1155,10 +1156,13 @@
 	})
 }
 
-type apexNativeDependencies struct {
+type ApexNativeDependencies struct {
 	// List of native libraries
 	Native_shared_libs []string
 
+	// List of JNI libraries
+	Jni_libs []string
+
 	// List of native executables
 	Binaries []string
 
@@ -1168,19 +1172,19 @@
 
 type apexMultilibProperties struct {
 	// Native dependencies whose compile_multilib is "first"
-	First apexNativeDependencies
+	First ApexNativeDependencies
 
 	// Native dependencies whose compile_multilib is "both"
-	Both apexNativeDependencies
+	Both ApexNativeDependencies
 
 	// Native dependencies whose compile_multilib is "prefer32"
-	Prefer32 apexNativeDependencies
+	Prefer32 ApexNativeDependencies
 
 	// Native dependencies whose compile_multilib is "32"
-	Lib32 apexNativeDependencies
+	Lib32 ApexNativeDependencies
 
 	// Native dependencies whose compile_multilib is "64"
-	Lib64 apexNativeDependencies
+	Lib64 ApexNativeDependencies
 }
 
 type apexBundleProperties struct {
@@ -1202,11 +1206,7 @@
 	// Default: /system/sepolicy/apex/<module_name>_file_contexts.
 	File_contexts *string `android:"path"`
 
-	// List of native shared libs that are embedded inside this APEX bundle
-	Native_shared_libs []string
-
-	// List of executables that are embedded inside this APEX bundle
-	Binaries []string
+	ApexNativeDependencies
 
 	// List of java libraries that are embedded inside this APEX bundle
 	Java_libs []string
@@ -1214,9 +1214,6 @@
 	// List of prebuilt files that are embedded inside this APEX bundle
 	Prebuilts []string
 
-	// List of tests that are embedded inside this APEX bundle
-	Tests []string
-
 	// Name of the apex_key module that provides the private key to sign APEX
 	Key *string
 
@@ -1280,6 +1277,9 @@
 	// rules for making sure that the APEX is truely updatable. This will also disable the size optimizations
 	// like symlinking to the system libs. Default is false.
 	Updatable *bool
+
+	// The minimum SDK version that this apex must be compatibile with.
+	Min_sdk_version *string
 }
 
 type apexTargetBundleProperties struct {
@@ -1410,6 +1410,8 @@
 
 	jacocoReportClassesFile android.Path     // only for javalibs and apps
 	certificate             java.Certificate // only for apps
+
+	isJniLib bool
 }
 
 func newApexFile(ctx android.BaseModuleContext, builtFile android.Path, moduleName string, installDir string, class apexFileClass, module android.Module) apexFile {
@@ -1528,7 +1530,7 @@
 }
 
 func addDependenciesForNativeModules(ctx android.BottomUpMutatorContext,
-	native_shared_libs []string, binaries []string, tests []string,
+	nativeModules ApexNativeDependencies,
 	target android.Target, imageVariation string) {
 	// Use *FarVariation* to be able to depend on modules having
 	// conflicting variations with this module. This is required since
@@ -1538,16 +1540,22 @@
 		{Mutator: "image", Variation: imageVariation},
 		{Mutator: "link", Variation: "shared"},
 		{Mutator: "version", Variation: ""}, // "" is the non-stub variant
-	}...), sharedLibTag, native_shared_libs...)
+	}...), sharedLibTag, nativeModules.Native_shared_libs...)
+
+	ctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
+		{Mutator: "image", Variation: imageVariation},
+		{Mutator: "link", Variation: "shared"},
+		{Mutator: "version", Variation: ""}, // "" is the non-stub variant
+	}...), jniLibTag, nativeModules.Jni_libs...)
 
 	ctx.AddFarVariationDependencies(append(target.Variations(),
 		blueprint.Variation{Mutator: "image", Variation: imageVariation}),
-		executableTag, binaries...)
+		executableTag, nativeModules.Binaries...)
 
 	ctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
 		{Mutator: "image", Variation: imageVariation},
 		{Mutator: "test_per_src", Variation: ""}, // "" is the all-tests variant
-	}...), testTag, tests...)
+	}...), testTag, nativeModules.Tests...)
 }
 
 func (a *apexBundle) combineProperties(ctx android.BottomUpMutatorContext) {
@@ -1580,41 +1588,39 @@
 		}
 	}
 	for i, target := range targets {
-		// When multilib.* is omitted for native_shared_libs, it implies
-		// multilib.both.
-		ctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
-			{Mutator: "image", Variation: a.getImageVariation(config)},
-			{Mutator: "link", Variation: "shared"},
-		}...), sharedLibTag, a.properties.Native_shared_libs...)
-
-		// When multilib.* is omitted for tests, it implies
-		// multilib.both.
-		ctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
-			{Mutator: "image", Variation: a.getImageVariation(config)},
-			{Mutator: "test_per_src", Variation: ""}, // "" is the all-tests variant
-		}...), testTag, a.properties.Tests...)
+		// When multilib.* is omitted for native_shared_libs/jni_libs/tests, it implies
+		// multilib.both
+		addDependenciesForNativeModules(ctx,
+			ApexNativeDependencies{
+				Native_shared_libs: a.properties.Native_shared_libs,
+				Tests:              a.properties.Tests,
+				Jni_libs:           a.properties.Jni_libs,
+				Binaries:           nil,
+			},
+			target, a.getImageVariation(config))
 
 		// Add native modules targetting both ABIs
 		addDependenciesForNativeModules(ctx,
-			a.properties.Multilib.Both.Native_shared_libs,
-			a.properties.Multilib.Both.Binaries,
-			a.properties.Multilib.Both.Tests,
+			a.properties.Multilib.Both,
 			target,
 			a.getImageVariation(config))
 
 		isPrimaryAbi := i == 0
 		if isPrimaryAbi {
 			// When multilib.* is omitted for binaries, it implies
-			// multilib.first.
-			ctx.AddFarVariationDependencies(append(target.Variations(),
-				blueprint.Variation{Mutator: "image", Variation: a.getImageVariation(config)}),
-				executableTag, a.properties.Binaries...)
+			// multilib.first
+			addDependenciesForNativeModules(ctx,
+				ApexNativeDependencies{
+					Native_shared_libs: nil,
+					Tests:              nil,
+					Jni_libs:           nil,
+					Binaries:           a.properties.Binaries,
+				},
+				target, a.getImageVariation(config))
 
 			// Add native modules targetting the first ABI
 			addDependenciesForNativeModules(ctx,
-				a.properties.Multilib.First.Native_shared_libs,
-				a.properties.Multilib.First.Binaries,
-				a.properties.Multilib.First.Tests,
+				a.properties.Multilib.First,
 				target,
 				a.getImageVariation(config))
 		}
@@ -1623,32 +1629,24 @@
 		case "lib32":
 			// Add native modules targetting 32-bit ABI
 			addDependenciesForNativeModules(ctx,
-				a.properties.Multilib.Lib32.Native_shared_libs,
-				a.properties.Multilib.Lib32.Binaries,
-				a.properties.Multilib.Lib32.Tests,
+				a.properties.Multilib.Lib32,
 				target,
 				a.getImageVariation(config))
 
 			addDependenciesForNativeModules(ctx,
-				a.properties.Multilib.Prefer32.Native_shared_libs,
-				a.properties.Multilib.Prefer32.Binaries,
-				a.properties.Multilib.Prefer32.Tests,
+				a.properties.Multilib.Prefer32,
 				target,
 				a.getImageVariation(config))
 		case "lib64":
 			// Add native modules targetting 64-bit ABI
 			addDependenciesForNativeModules(ctx,
-				a.properties.Multilib.Lib64.Native_shared_libs,
-				a.properties.Multilib.Lib64.Binaries,
-				a.properties.Multilib.Lib64.Tests,
+				a.properties.Multilib.Lib64,
 				target,
 				a.getImageVariation(config))
 
 			if !has32BitTarget {
 				addDependenciesForNativeModules(ctx,
-					a.properties.Multilib.Prefer32.Native_shared_libs,
-					a.properties.Multilib.Prefer32.Binaries,
-					a.properties.Multilib.Prefer32.Tests,
+					a.properties.Multilib.Prefer32,
 					target,
 					a.getImageVariation(config))
 			}
@@ -1657,8 +1655,8 @@
 				for _, sanitizer := range ctx.Config().SanitizeDevice() {
 					if sanitizer == "hwaddress" {
 						addDependenciesForNativeModules(ctx,
-							[]string{"libclang_rt.hwasan-aarch64-android"},
-							nil, nil, target, a.getImageVariation(config))
+							ApexNativeDependencies{[]string{"libclang_rt.hwasan-aarch64-android"}, nil, nil, nil},
+							target, a.getImageVariation(config))
 						break
 					}
 				}
@@ -2079,16 +2077,23 @@
 		depName := ctx.OtherModuleName(child)
 		if _, isDirectDep := parent.(*apexBundle); isDirectDep {
 			switch depTag {
-			case sharedLibTag:
+			case sharedLibTag, jniLibTag:
+				isJniLib := depTag == jniLibTag
 				if c, ok := child.(*cc.Module); ok {
 					// bootstrap bionic libs are treated as provided by system
 					if c.HasStubsVariants() && !cc.InstallToBootstrap(c.BaseModuleName(), ctx.Config()) {
 						provideNativeLibs = append(provideNativeLibs, c.OutputFile().Path().Base())
 					}
-					filesInfo = append(filesInfo, apexFileForNativeLibrary(ctx, c, handleSpecialLibs))
+					fi := apexFileForNativeLibrary(ctx, c, handleSpecialLibs)
+					fi.isJniLib = isJniLib
+					filesInfo = append(filesInfo, fi)
 					return true // track transitive dependencies
 				} else {
-					ctx.PropertyErrorf("native_shared_libs", "%q is not a cc_library or cc_library_shared module", depName)
+					propertyName := "native_shared_libs"
+					if isJniLib {
+						propertyName = "jni_libs"
+					}
+					ctx.PropertyErrorf(propertyName, "%q is not a cc_library or cc_library_shared module", depName)
 				}
 			case executableTag:
 				if cc, ok := child.(*cc.Module); ok {
@@ -2230,7 +2235,8 @@
 						return true // track transitive dependencies
 					}
 				} else if java.IsJniDepTag(depTag) {
-					return true
+					// Because APK-in-APEX embeds jni_libs transitively, we don't need to track transitive deps
+					return false
 				} else if java.IsXmlPermissionsFileDepTag(depTag) {
 					if prebuilt, ok := child.(android.PrebuiltEtcModule); ok {
 						filesInfo = append(filesInfo, apexFileForPrebuiltEtc(ctx, prebuilt, depName))
@@ -2323,6 +2329,11 @@
 		a.linkToSystemLib = false
 	}
 
+	// We also don't want the optimization for host APEXes, because it doesn't make sense.
+	if ctx.Host() {
+		a.linkToSystemLib = false
+	}
+
 	// prepare apex_manifest.json
 	a.buildManifest(ctx, provideNativeLibs, requireNativeLibs)
 
diff --git a/apex/apex_test.go b/apex/apex_test.go
index e694435..8c5ca8b 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -226,6 +226,14 @@
 	os.RemoveAll(buildDir)
 }
 
+// ensure that 'result' equals 'expected'
+func ensureEquals(t *testing.T, result string, expected string) {
+	t.Helper()
+	if result != expected {
+		t.Errorf("%q != %q", expected, result)
+	}
+}
+
 // ensure that 'result' contains 'expected'
 func ensureContains(t *testing.T, result string, expected string) {
 	t.Helper()
@@ -1532,13 +1540,17 @@
 	var surplus []string
 	filesMatched := make(map[string]bool)
 	for _, file := range getFiles(t, ctx, moduleName, variant) {
+		mactchFound := false
 		for _, expected := range files {
 			if matched, _ := path.Match(expected, file.path); matched {
 				filesMatched[expected] = true
-				return
+				mactchFound = true
+				break
 			}
 		}
-		surplus = append(surplus, file.path)
+		if !mactchFound {
+			surplus = append(surplus, file.path)
+		}
 	}
 
 	if len(surplus) > 0 {
@@ -1605,8 +1617,10 @@
 	ensureExactContents(t, ctx, "myapex", "android_common_image", []string{
 		"lib/libvndk.so",
 		"lib/libvndksp.so",
+		"lib/libc++.so",
 		"lib64/libvndk.so",
 		"lib64/libvndksp.so",
+		"lib64/libc++.so",
 		"etc/llndk.libraries.VER.txt",
 		"etc/vndkcore.libraries.VER.txt",
 		"etc/vndksp.libraries.VER.txt",
@@ -1666,6 +1680,8 @@
 		"lib/libvndk.so",
 		"lib/libvndk.arm.so",
 		"lib64/libvndk.so",
+		"lib/libc++.so",
+		"lib64/libc++.so",
 		"etc/*",
 	})
 }
@@ -1877,6 +1893,8 @@
 	ensureExactContents(t, ctx, "myapex", "android_common_image", []string{
 		"lib/libvndk.so",
 		"lib64/libvndk.so",
+		"lib/libc++.so",
+		"lib64/libc++.so",
 		"etc/*",
 	})
 }
@@ -2871,27 +2889,39 @@
 		android_app {
 			name: "AppFoo",
 			srcs: ["foo/bar/MyClass.java"],
-			sdk_version: "none",
+			sdk_version: "current",
 			system_modules: "none",
 			jni_libs: ["libjni"],
+			stl: "none",
 			apex_available: [ "myapex" ],
 		}
 
 		android_app {
 			name: "AppFooPriv",
 			srcs: ["foo/bar/MyClass.java"],
-			sdk_version: "none",
+			sdk_version: "current",
 			system_modules: "none",
 			privileged: true,
+			stl: "none",
 			apex_available: [ "myapex" ],
 		}
 
 		cc_library_shared {
 			name: "libjni",
 			srcs: ["mylib.cpp"],
+			shared_libs: ["libfoo"],
 			stl: "none",
 			system_shared_libs: [],
 			apex_available: [ "myapex" ],
+			sdk_version: "current",
+		}
+
+		cc_library_shared {
+			name: "libfoo",
+			stl: "none",
+			system_shared_libs: [],
+			apex_available: [ "myapex" ],
+			sdk_version: "current",
 		}
 	`)
 
@@ -2902,16 +2932,19 @@
 	ensureContains(t, copyCmds, "image.apex/app/AppFoo/AppFoo.apk")
 	ensureContains(t, copyCmds, "image.apex/priv-app/AppFooPriv/AppFooPriv.apk")
 
-	// JNI libraries are embedded inside APK
-	appZipRule := ctx.ModuleForTests("AppFoo", "android_common_myapex").Description("zip jni lib")
-	libjniOutput := ctx.ModuleForTests("libjni", "android_arm64_armv8-a_shared_myapex").Module().(*cc.Module).OutputFile()
-	ensureListContains(t, appZipRule.Implicits.Strings(), libjniOutput.String())
-	// ... uncompressed
+	appZipRule := ctx.ModuleForTests("AppFoo", "android_common_myapex").Description("zip jni libs")
+	// JNI libraries are uncompressed
 	if args := appZipRule.Args["jarArgs"]; !strings.Contains(args, "-L 0") {
-		t.Errorf("jni lib is not uncompressed for AppFoo")
+		t.Errorf("jni libs are not uncompressed for AppFoo")
 	}
-	// ... and not directly inside the APEX
-	ensureNotContains(t, copyCmds, "image.apex/lib64/libjni.so")
+	// JNI libraries including transitive deps are
+	for _, jni := range []string{"libjni", "libfoo"} {
+		jniOutput := ctx.ModuleForTests(jni, "android_arm64_armv8-a_shared_myapex").Module().(*cc.Module).OutputFile()
+		// ... embedded inside APK (jnilibs.zip)
+		ensureListContains(t, appZipRule.Implicits.Strings(), jniOutput.String())
+		// ... and not directly inside the APEX
+		ensureNotContains(t, copyCmds, "image.apex/lib64/"+jni+".so")
+	}
 }
 
 func TestApexWithAppImports(t *testing.T) {
@@ -3596,6 +3629,70 @@
 	ensureRealfileExists(t, files, "lib64/myotherlib.so") // this is a real file
 }
 
+func TestApexWithJniLibs(t *testing.T) {
+	ctx, _ := testApex(t, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			jni_libs: ["mylib"],
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+
+		cc_library {
+			name: "mylib",
+			srcs: ["mylib.cpp"],
+			shared_libs: ["mylib2"],
+			system_shared_libs: [],
+			stl: "none",
+			apex_available: [ "myapex" ],
+		}
+
+		cc_library {
+			name: "mylib2",
+			srcs: ["mylib.cpp"],
+			system_shared_libs: [],
+			stl: "none",
+			apex_available: [ "myapex" ],
+		}
+	`)
+
+	rule := ctx.ModuleForTests("myapex", "android_common_myapex_image").Rule("apexManifestRule")
+	// Notice mylib2.so (transitive dep) is not added as a jni_lib
+	ensureEquals(t, rule.Args["opt"], "-a jniLibs mylib.so")
+	ensureExactContents(t, ctx, "myapex", "android_common_myapex_image", []string{
+		"lib64/mylib.so",
+		"lib64/mylib2.so",
+	})
+}
+
+func TestApexWithJniLibs_Errors(t *testing.T) {
+	testApexError(t, `jni_libs: "xxx" is not a cc_library`, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			jni_libs: ["xxx"],
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+
+		prebuilt_etc {
+			name: "xxx",
+			src: "xxx",
+		}
+	`, withFiles(map[string][]byte{
+		"xxx": nil,
+	}))
+}
+
 func TestMain(m *testing.M) {
 	run := func() int {
 		setUp()
diff --git a/apex/builder.go b/apex/builder.go
index 88c7098..8c81fb4 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -180,6 +180,17 @@
 		optCommands = append(optCommands, "-v name "+*a.properties.Apex_name)
 	}
 
+	// collect jniLibs. Notice that a.filesInfo is already sorted
+	var jniLibs []string
+	for _, fi := range a.filesInfo {
+		if fi.isJniLib {
+			jniLibs = append(jniLibs, fi.builtFile.Base())
+		}
+	}
+	if len(jniLibs) > 0 {
+		optCommands = append(optCommands, "-a jniLibs "+strings.Join(jniLibs, " "))
+	}
+
 	ctx.Build(pctx, android.BuildParams{
 		Rule:   apexManifestRule,
 		Input:  manifestSrc,
@@ -215,15 +226,15 @@
 	noticeFiles := []android.Path{}
 	for _, f := range a.filesInfo {
 		if f.module != nil {
-			notice := f.module.NoticeFile()
-			if notice.Valid() {
-				noticeFiles = append(noticeFiles, notice.Path())
+			notices := f.module.NoticeFiles()
+			if len(notices) > 0 {
+				noticeFiles = append(noticeFiles, notices...)
 			}
 		}
 	}
 	// append the notice file specified in the apex module itself
-	if a.NoticeFile().Valid() {
-		noticeFiles = append(noticeFiles, a.NoticeFile().Path())
+	if len(a.NoticeFiles()) > 0 {
+		noticeFiles = append(noticeFiles, a.NoticeFiles()...)
 	}
 
 	if len(noticeFiles) == 0 {
@@ -383,6 +394,16 @@
 
 		targetSdkVersion := ctx.Config().DefaultAppTargetSdk()
 		minSdkVersion := ctx.Config().DefaultAppTargetSdk()
+
+		if proptools.Bool(a.properties.Legacy_android10_support) {
+			if !java.UseApiFingerprint(ctx, targetSdkVersion) {
+				targetSdkVersion = "29"
+			}
+			if !java.UseApiFingerprint(ctx, minSdkVersion) {
+				minSdkVersion = "29"
+			}
+		}
+
 		if java.UseApiFingerprint(ctx, targetSdkVersion) {
 			targetSdkVersion += fmt.Sprintf(".$$(cat %s)", java.ApiFingerprintPath(ctx).String())
 			implicitInputs = append(implicitInputs, java.ApiFingerprintPath(ctx))
diff --git a/build_kzip.bash b/build_kzip.bash
index 008030f..0018ea9 100755
--- a/build_kzip.bash
+++ b/build_kzip.bash
@@ -19,16 +19,20 @@
 # The extraction might fail for some source files, so run with -k and then check that
 # sufficiently many files were generated.
 declare -r out="${OUT_DIR:-out}"
+
 # Build extraction files for C++ and Java. Build `merge_zips` which we use later.
 build/soong/soong_ui.bash --build-mode --all-modules --dir=$PWD -k merge_zips xref_cxx xref_java
-#Build extraction file for Go files in build/soong directory.
+
+# Build extraction file for Go the files in build/{blueprint,soong} directories.
 declare -r abspath_out=$(realpath "${out}")
 declare -r go_extractor=$(realpath prebuilts/build-tools/linux-x86/bin/go_extractor)
 declare -r go_root=$(realpath prebuilts/go/linux-x86)
+declare -r vnames_path=$(realpath build/soong/vnames.go.json)
+declare -r source_root=$PWD
 for dir in blueprint soong; do
   (cd "build/$dir";
-   "$go_extractor" --goroot="$go_root" --rules=vnames.go.json --canonicalize_package_corpus \
-    --output "${abspath_out}/soong/build_${dir}.go.kzip" ./...
+   KYTHE_ROOT_DIRECTORY="${source_root}" "$go_extractor" --goroot="$go_root" --rules="${vnames_path}" \
+   --canonicalize_package_corpus --output "${abspath_out}/soong/build_${dir}.go.kzip" ./...
   )
 done
 
diff --git a/cc/androidmk.go b/cc/androidmk.go
index a78e455..81004da 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -34,7 +34,7 @@
 type AndroidMkContext interface {
 	Name() string
 	Target() android.Target
-	subAndroidMk(*android.AndroidMkData, interface{})
+	subAndroidMk(*android.AndroidMkEntries, interface{})
 	Arch() android.Arch
 	Os() android.OsType
 	Host() bool
@@ -46,29 +46,29 @@
 }
 
 type subAndroidMkProvider interface {
-	AndroidMk(AndroidMkContext, *android.AndroidMkData)
+	AndroidMkEntries(AndroidMkContext, *android.AndroidMkEntries)
 }
 
-func (c *Module) subAndroidMk(data *android.AndroidMkData, obj interface{}) {
+func (c *Module) subAndroidMk(entries *android.AndroidMkEntries, obj interface{}) {
 	if c.subAndroidMkOnce == nil {
 		c.subAndroidMkOnce = make(map[subAndroidMkProvider]bool)
 	}
 	if androidmk, ok := obj.(subAndroidMkProvider); ok {
 		if !c.subAndroidMkOnce[androidmk] {
 			c.subAndroidMkOnce[androidmk] = true
-			androidmk.AndroidMk(c, data)
+			androidmk.AndroidMkEntries(c, entries)
 		}
 	}
 }
 
-func (c *Module) AndroidMk() android.AndroidMkData {
+func (c *Module) AndroidMkEntries() []android.AndroidMkEntries {
 	if c.Properties.HideFromMake || !c.IsForPlatform() {
-		return android.AndroidMkData{
+		return []android.AndroidMkEntries{{
 			Disabled: true,
-		}
+		}}
 	}
 
-	ret := android.AndroidMkData{
+	entries := android.AndroidMkEntries{
 		OutputFile: c.outputFile,
 		// TODO(jiyong): add the APEXes providing shared libs to the required modules
 		// Currently, adding c.Properties.ApexesProvidingSharedLibs is causing multiple
@@ -77,29 +77,29 @@
 		Required: c.Properties.AndroidMkRuntimeLibs,
 		Include:  "$(BUILD_SYSTEM)/soong_cc_prebuilt.mk",
 
-		Extra: []android.AndroidMkExtraFunc{
-			func(w io.Writer, outputFile android.Path) {
+		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
+			func(entries *android.AndroidMkEntries) {
 				if len(c.Properties.Logtags) > 0 {
-					fmt.Fprintln(w, "LOCAL_LOGTAGS_FILES :=", strings.Join(c.Properties.Logtags, " "))
+					entries.AddStrings("LOCAL_LOGTAGS_FILES", c.Properties.Logtags...)
 				}
 				if len(c.Properties.AndroidMkSharedLibs) > 0 {
-					fmt.Fprintln(w, "LOCAL_SHARED_LIBRARIES := "+strings.Join(c.Properties.AndroidMkSharedLibs, " "))
+					entries.AddStrings("LOCAL_SHARED_LIBRARIES", c.Properties.AndroidMkSharedLibs...)
 				}
 				if len(c.Properties.AndroidMkStaticLibs) > 0 {
-					fmt.Fprintln(w, "LOCAL_STATIC_LIBRARIES := "+strings.Join(c.Properties.AndroidMkStaticLibs, " "))
+					entries.AddStrings("LOCAL_STATIC_LIBRARIES", c.Properties.AndroidMkStaticLibs...)
 				}
 				if len(c.Properties.AndroidMkWholeStaticLibs) > 0 {
-					fmt.Fprintln(w, "LOCAL_WHOLE_STATIC_LIBRARIES := "+strings.Join(c.Properties.AndroidMkWholeStaticLibs, " "))
+					entries.AddStrings("LOCAL_WHOLE_STATIC_LIBRARIES", c.Properties.AndroidMkWholeStaticLibs...)
 				}
-				fmt.Fprintln(w, "LOCAL_SOONG_LINK_TYPE :=", c.makeLinkType)
+				entries.SetString("LOCAL_SOONG_LINK_TYPE", c.makeLinkType)
 				if c.UseVndk() {
-					fmt.Fprintln(w, "LOCAL_USE_VNDK := true")
+					entries.SetBool("LOCAL_USE_VNDK", true)
 					if c.IsVndk() && !c.static() {
-						fmt.Fprintln(w, "LOCAL_SOONG_VNDK_VERSION := "+c.VndkVersion())
+						entries.SetString("LOCAL_SOONG_VNDK_VERSION", c.VndkVersion())
 						// VNDK libraries available to vendor are not installed because
 						// they are packaged in VNDK APEX and installed by APEX packages (apex/apex.go)
 						if !c.isVndkExt() {
-							fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
+							entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
 						}
 					}
 				}
@@ -108,22 +108,22 @@
 	}
 
 	for _, feature := range c.features {
-		c.subAndroidMk(&ret, feature)
+		c.subAndroidMk(&entries, feature)
 	}
 
-	c.subAndroidMk(&ret, c.compiler)
-	c.subAndroidMk(&ret, c.linker)
+	c.subAndroidMk(&entries, c.compiler)
+	c.subAndroidMk(&entries, c.linker)
 	if c.sanitize != nil {
-		c.subAndroidMk(&ret, c.sanitize)
+		c.subAndroidMk(&entries, c.sanitize)
 	}
-	c.subAndroidMk(&ret, c.installer)
+	c.subAndroidMk(&entries, c.installer)
 
-	ret.SubName += c.Properties.SubName
+	entries.SubName += c.Properties.SubName
 
-	return ret
+	return []android.AndroidMkEntries{entries}
 }
 
-func androidMkWriteTestData(data android.Paths, ctx AndroidMkContext, ret *android.AndroidMkData) {
+func androidMkWriteTestData(data android.Paths, ctx AndroidMkContext, entries *android.AndroidMkEntries) {
 	var testFiles []string
 	for _, d := range data {
 		rel := d.Rel()
@@ -135,8 +135,8 @@
 		testFiles = append(testFiles, path+":"+rel)
 	}
 	if len(testFiles) > 0 {
-		ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-			fmt.Fprintln(w, "LOCAL_TEST_DATA := "+strings.Join(testFiles, " "))
+		entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+			entries.AddStrings("LOCAL_TEST_DATA", testFiles...)
 		})
 	}
 }
@@ -153,7 +153,7 @@
 	return overrides
 }
 
-func (library *libraryDecorator) androidMkWriteExportedFlags(w io.Writer) {
+func (library *libraryDecorator) androidMkWriteExportedFlags(entries *android.AndroidMkEntries) {
 	exportedFlags := library.exportedFlags()
 	for _, dir := range library.exportedDirs() {
 		exportedFlags = append(exportedFlags, "-I"+dir.String())
@@ -162,75 +162,92 @@
 		exportedFlags = append(exportedFlags, "-isystem "+dir.String())
 	}
 	if len(exportedFlags) > 0 {
-		fmt.Fprintln(w, "LOCAL_EXPORT_CFLAGS :=", strings.Join(exportedFlags, " "))
+		entries.AddStrings("LOCAL_EXPORT_CFLAGS", exportedFlags...)
 	}
 	exportedDeps := library.exportedDeps()
 	if len(exportedDeps) > 0 {
-		fmt.Fprintln(w, "LOCAL_EXPORT_C_INCLUDE_DEPS :=", strings.Join(exportedDeps.Strings(), " "))
+		entries.AddStrings("LOCAL_EXPORT_C_INCLUDE_DEPS", exportedDeps.Strings()...)
 	}
 }
 
-func (library *libraryDecorator) androidMkWriteAdditionalDependenciesForSourceAbiDiff(w io.Writer) {
+func (library *libraryDecorator) androidMkEntriesWriteAdditionalDependenciesForSourceAbiDiff(entries *android.AndroidMkEntries) {
 	if library.sAbiOutputFile.Valid() {
-		fmt.Fprintln(w, "LOCAL_ADDITIONAL_DEPENDENCIES +=", library.sAbiOutputFile.String())
+		entries.SetString("LOCAL_ADDITIONAL_DEPENDENCIES",
+			"$(LOCAL_ADDITIONAL_DEPENDENCIES) "+library.sAbiOutputFile.String())
 		if library.sAbiDiff.Valid() && !library.static() {
-			fmt.Fprintln(w, "LOCAL_ADDITIONAL_DEPENDENCIES +=", library.sAbiDiff.String())
-			fmt.Fprintln(w, "HEADER_ABI_DIFFS +=", library.sAbiDiff.String())
+			entries.SetString("LOCAL_ADDITIONAL_DEPENDENCIES",
+				"$(LOCAL_ADDITIONAL_DEPENDENCIES) "+library.sAbiDiff.String())
+			entries.SetString("HEADER_ABI_DIFFS",
+				"$(HEADER_ABI_DIFFS) "+library.sAbiDiff.String())
 		}
 	}
 }
 
-func (library *libraryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+// TODO(ccross): remove this once apex/androidmk.go is converted to AndroidMkEntries
+func (library *libraryDecorator) androidMkWriteAdditionalDependenciesForSourceAbiDiff(w io.Writer) {
+	if library.sAbiOutputFile.Valid() {
+		fmt.Fprintln(w, "LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_ADDITIONAL_DEPENDENCIES) ",
+			library.sAbiOutputFile.String())
+		if library.sAbiDiff.Valid() && !library.static() {
+			fmt.Fprintln(w, "LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_ADDITIONAL_DEPENDENCIES) ",
+				library.sAbiDiff.String())
+			fmt.Fprintln(w, "HEADER_ABI_DIFFS := $(HEADER_ABI_DIFFS) ",
+				library.sAbiDiff.String())
+		}
+	}
+}
+
+func (library *libraryDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
 	if library.static() {
-		ret.Class = "STATIC_LIBRARIES"
+		entries.Class = "STATIC_LIBRARIES"
 	} else if library.shared() {
-		ret.Class = "SHARED_LIBRARIES"
-		ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-			fmt.Fprintln(w, "LOCAL_SOONG_TOC :=", library.toc().String())
+		entries.Class = "SHARED_LIBRARIES"
+		entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+			entries.SetString("LOCAL_SOONG_TOC", library.toc().String())
 			if !library.buildStubs() {
-				fmt.Fprintln(w, "LOCAL_SOONG_UNSTRIPPED_BINARY :=", library.unstrippedOutputFile.String())
+				entries.SetString("LOCAL_SOONG_UNSTRIPPED_BINARY", library.unstrippedOutputFile.String())
 			}
 			if len(library.Properties.Overrides) > 0 {
-				fmt.Fprintln(w, "LOCAL_OVERRIDES_MODULES := "+strings.Join(makeOverrideModuleNames(ctx, library.Properties.Overrides), " "))
+				entries.SetString("LOCAL_OVERRIDES_MODULES", strings.Join(makeOverrideModuleNames(ctx, library.Properties.Overrides), " "))
 			}
 			if len(library.post_install_cmds) > 0 {
-				fmt.Fprintln(w, "LOCAL_POST_INSTALL_CMD := "+strings.Join(library.post_install_cmds, "&& "))
+				entries.SetString("LOCAL_POST_INSTALL_CMD", strings.Join(library.post_install_cmds, "&& "))
 			}
 		})
 	} else if library.header() {
-		ret.Class = "HEADER_LIBRARIES"
+		entries.Class = "HEADER_LIBRARIES"
 	}
 
-	ret.DistFile = library.distFile
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		library.androidMkWriteExportedFlags(w)
-		library.androidMkWriteAdditionalDependenciesForSourceAbiDiff(w)
+	entries.DistFile = library.distFile
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		library.androidMkWriteExportedFlags(entries)
+		library.androidMkEntriesWriteAdditionalDependenciesForSourceAbiDiff(entries)
 
-		_, _, ext := android.SplitFileExt(outputFile.Base())
+		_, _, ext := android.SplitFileExt(entries.OutputFile.Path().Base())
 
-		fmt.Fprintln(w, "LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE)"+ext)
+		entries.SetString("LOCAL_BUILT_MODULE_STEM", "$(LOCAL_MODULE)"+ext)
 
 		if library.coverageOutputFile.Valid() {
-			fmt.Fprintln(w, "LOCAL_PREBUILT_COVERAGE_ARCHIVE :=", library.coverageOutputFile.String())
+			entries.SetString("LOCAL_PREBUILT_COVERAGE_ARCHIVE", library.coverageOutputFile.String())
 		}
 
 		if library.useCoreVariant {
-			fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
-			fmt.Fprintln(w, "LOCAL_NO_NOTICE_FILE := true")
-			fmt.Fprintln(w, "LOCAL_VNDK_DEPEND_ON_CORE_VARIANT := true")
+			entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
+			entries.SetBool("LOCAL_NO_NOTICE_FILE", true)
+			entries.SetBool("LOCAL_VNDK_DEPEND_ON_CORE_VARIANT", true)
 		}
 		if library.checkSameCoreVariant {
-			fmt.Fprintln(w, "LOCAL_CHECK_SAME_VNDK_VARIANTS := true")
+			entries.SetBool("LOCAL_CHECK_SAME_VNDK_VARIANTS", true)
 		}
 	})
 
 	if library.shared() && !library.buildStubs() {
-		ctx.subAndroidMk(ret, library.baseInstaller)
+		ctx.subAndroidMk(entries, library.baseInstaller)
 	} else {
-		ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-			fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
+		entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+			entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
 			if library.buildStubs() {
-				fmt.Fprintln(w, "LOCAL_NO_NOTICE_FILE := true")
+				entries.SetBool("LOCAL_NO_NOTICE_FILE", true)
 			}
 		})
 	}
@@ -238,90 +255,91 @@
 		android.DirectlyInAnyApex(ctx, ctx.Name()) && !ctx.InRamdisk() && !ctx.InRecovery() && !ctx.UseVndk() &&
 		!ctx.static() {
 		if !library.buildStubs() {
-			ret.SubName = ".bootstrap"
+			entries.SubName = ".bootstrap"
 		}
 	}
 }
 
-func (object *objectLinker) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Custom = func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
-		out := ret.OutputFile.Path()
-		varname := fmt.Sprintf("SOONG_%sOBJECT_%s%s", prefix, name, data.SubName)
+func (object *objectLinker) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.Class = "STATIC_LIBRARIES"
+	entries.ExtraFooters = append(entries.ExtraFooters,
+		func(w io.Writer, name, prefix, moduleDir string, entries *android.AndroidMkEntries) {
+			out := entries.OutputFile.Path()
+			varname := fmt.Sprintf("SOONG_%sOBJECT_%s%s", prefix, name, entries.SubName)
 
-		fmt.Fprintf(w, "\n%s := %s\n", varname, out.String())
-		fmt.Fprintln(w, ".KATI_READONLY: "+varname)
-	}
+			fmt.Fprintf(w, "\n%s := %s\n", varname, out.String())
+			fmt.Fprintln(w, ".KATI_READONLY: "+varname)
+		})
 }
 
-func (binary *binaryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ctx.subAndroidMk(ret, binary.baseInstaller)
+func (binary *binaryDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	ctx.subAndroidMk(entries, binary.baseInstaller)
 
-	ret.Class = "EXECUTABLES"
-	ret.DistFile = binary.distFile
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		fmt.Fprintln(w, "LOCAL_SOONG_UNSTRIPPED_BINARY :=", binary.unstrippedOutputFile.String())
+	entries.Class = "EXECUTABLES"
+	entries.DistFile = binary.distFile
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		entries.SetString("LOCAL_SOONG_UNSTRIPPED_BINARY", binary.unstrippedOutputFile.String())
 		if len(binary.symlinks) > 0 {
-			fmt.Fprintln(w, "LOCAL_MODULE_SYMLINKS := "+strings.Join(binary.symlinks, " "))
+			entries.AddStrings("LOCAL_MODULE_SYMLINKS", binary.symlinks...)
 		}
 
 		if binary.coverageOutputFile.Valid() {
-			fmt.Fprintln(w, "LOCAL_PREBUILT_COVERAGE_ARCHIVE :=", binary.coverageOutputFile.String())
+			entries.SetString("LOCAL_PREBUILT_COVERAGE_ARCHIVE", binary.coverageOutputFile.String())
 		}
 
 		if len(binary.Properties.Overrides) > 0 {
-			fmt.Fprintln(w, "LOCAL_OVERRIDES_MODULES := "+strings.Join(makeOverrideModuleNames(ctx, binary.Properties.Overrides), " "))
+			entries.SetString("LOCAL_OVERRIDES_MODULES", strings.Join(makeOverrideModuleNames(ctx, binary.Properties.Overrides), " "))
 		}
 		if len(binary.post_install_cmds) > 0 {
-			fmt.Fprintln(w, "LOCAL_POST_INSTALL_CMD := "+strings.Join(binary.post_install_cmds, "&& "))
+			entries.SetString("LOCAL_POST_INSTALL_CMD", strings.Join(binary.post_install_cmds, "&& "))
 		}
 	})
 }
 
-func (benchmark *benchmarkDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ctx.subAndroidMk(ret, benchmark.binaryDecorator)
-	ret.Class = "NATIVE_TESTS"
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
+func (benchmark *benchmarkDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	ctx.subAndroidMk(entries, benchmark.binaryDecorator)
+	entries.Class = "NATIVE_TESTS"
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		if len(benchmark.Properties.Test_suites) > 0 {
-			fmt.Fprintln(w, "LOCAL_COMPATIBILITY_SUITE :=",
+			entries.SetString("LOCAL_COMPATIBILITY_SUITE",
 				strings.Join(benchmark.Properties.Test_suites, " "))
 		}
 		if benchmark.testConfig != nil {
-			fmt.Fprintln(w, "LOCAL_FULL_TEST_CONFIG :=", benchmark.testConfig.String())
+			entries.SetString("LOCAL_FULL_TEST_CONFIG", benchmark.testConfig.String())
 		}
-		fmt.Fprintln(w, "LOCAL_NATIVE_BENCHMARK := true")
+		entries.SetBool("LOCAL_NATIVE_BENCHMARK", true)
 		if !BoolDefault(benchmark.Properties.Auto_gen_config, true) {
-			fmt.Fprintln(w, "LOCAL_DISABLE_AUTO_GENERATE_TEST_CONFIG := true")
+			entries.SetBool("LOCAL_DISABLE_AUTO_GENERATE_TEST_CONFIG", true)
 		}
 	})
 
-	androidMkWriteTestData(benchmark.data, ctx, ret)
+	androidMkWriteTestData(benchmark.data, ctx, entries)
 }
 
-func (test *testBinary) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ctx.subAndroidMk(ret, test.binaryDecorator)
-	ret.Class = "NATIVE_TESTS"
+func (test *testBinary) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	ctx.subAndroidMk(entries, test.binaryDecorator)
+	entries.Class = "NATIVE_TESTS"
 	if Bool(test.Properties.Test_per_src) {
-		ret.SubName = "_" + String(test.binaryDecorator.Properties.Stem)
+		entries.SubName = "_" + String(test.binaryDecorator.Properties.Stem)
 	}
-
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		if len(test.Properties.Test_suites) > 0 {
-			fmt.Fprintln(w, "LOCAL_COMPATIBILITY_SUITE :=",
+			entries.SetString("LOCAL_COMPATIBILITY_SUITE",
 				strings.Join(test.Properties.Test_suites, " "))
 		}
 		if test.testConfig != nil {
-			fmt.Fprintln(w, "LOCAL_FULL_TEST_CONFIG :=", test.testConfig.String())
+			entries.SetString("LOCAL_FULL_TEST_CONFIG", test.testConfig.String())
 		}
 		if !BoolDefault(test.Properties.Auto_gen_config, true) {
-			fmt.Fprintln(w, "LOCAL_DISABLE_AUTO_GENERATE_TEST_CONFIG := true")
+			entries.SetBool("LOCAL_DISABLE_AUTO_GENERATE_TEST_CONFIG", true)
 		}
 	})
 
-	androidMkWriteTestData(test.data, ctx, ret)
+	androidMkWriteTestData(test.data, ctx, entries)
 }
 
-func (fuzz *fuzzBinary) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ctx.subAndroidMk(ret, fuzz.binaryDecorator)
+func (fuzz *fuzzBinary) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	ctx.subAndroidMk(entries, fuzz.binaryDecorator)
 
 	var fuzzFiles []string
 	for _, d := range fuzz.corpus {
@@ -344,199 +362,198 @@
 			filepath.Dir(fuzz.config.String())+":config.json")
 	}
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		fmt.Fprintln(w, "LOCAL_IS_FUZZ_TARGET := true")
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		entries.SetBool("LOCAL_IS_FUZZ_TARGET", true)
 		if len(fuzzFiles) > 0 {
-			fmt.Fprintln(w, "LOCAL_TEST_DATA := "+strings.Join(fuzzFiles, " "))
+			entries.AddStrings("LOCAL_TEST_DATA", fuzzFiles...)
 		}
 		if fuzz.installedSharedDeps != nil {
-			fmt.Fprintln(w, "LOCAL_FUZZ_INSTALLED_SHARED_DEPS :="+
-				strings.Join(fuzz.installedSharedDeps, " "))
+			entries.AddStrings("LOCAL_FUZZ_INSTALLED_SHARED_DEPS", fuzz.installedSharedDeps...)
 		}
 	})
 }
 
-func (test *testLibrary) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ctx.subAndroidMk(ret, test.libraryDecorator)
+func (test *testLibrary) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	ctx.subAndroidMk(entries, test.libraryDecorator)
 }
 
-func (library *toolchainLibraryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Class = "STATIC_LIBRARIES"
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		_, suffix, _ := android.SplitFileExt(outputFile.Base())
-		fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := "+suffix)
+func (library *toolchainLibraryDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.Class = "STATIC_LIBRARIES"
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		_, suffix, _ := android.SplitFileExt(entries.OutputFile.Path().Base())
+		entries.SetString("LOCAL_MODULE_SUFFIX", suffix)
 	})
 }
 
-func (installer *baseInstaller) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+func (installer *baseInstaller) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
 	// Soong installation is only supported for host modules. Have Make
 	// installation trigger Soong installation.
 	if ctx.Target().Os.Class == android.Host {
-		ret.OutputFile = android.OptionalPathForPath(installer.path)
+		entries.OutputFile = android.OptionalPathForPath(installer.path)
 	}
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		path, file := filepath.Split(installer.path.ToMakePath().String())
 		stem, suffix, _ := android.SplitFileExt(file)
-		fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := "+suffix)
-		fmt.Fprintln(w, "LOCAL_MODULE_PATH := "+path)
-		fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+stem)
+		entries.SetString("LOCAL_MODULE_SUFFIX", suffix)
+		entries.SetString("LOCAL_MODULE_PATH", path)
+		entries.SetString("LOCAL_MODULE_STEM", stem)
 	})
 }
 
-func (c *stubDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.SubName = ndkLibrarySuffix + "." + c.properties.ApiLevel
-	ret.Class = "SHARED_LIBRARIES"
+func (c *stubDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.SubName = ndkLibrarySuffix + "." + c.properties.ApiLevel
+	entries.Class = "SHARED_LIBRARIES"
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		path, file := filepath.Split(c.installPath.String())
 		stem, suffix, _ := android.SplitFileExt(file)
-		fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := "+suffix)
-		fmt.Fprintln(w, "LOCAL_MODULE_PATH := "+path)
-		fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+stem)
-		fmt.Fprintln(w, "LOCAL_NO_NOTICE_FILE := true")
+		entries.SetString("LOCAL_MODULE_SUFFIX", suffix)
+		entries.SetString("LOCAL_MODULE_PATH", path)
+		entries.SetString("LOCAL_MODULE_STEM", stem)
+		entries.SetBool("LOCAL_NO_NOTICE_FILE", true)
 	})
 }
 
-func (c *llndkStubDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Class = "SHARED_LIBRARIES"
+func (c *llndkStubDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.Class = "SHARED_LIBRARIES"
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		c.libraryDecorator.androidMkWriteExportedFlags(w)
-		_, _, ext := android.SplitFileExt(outputFile.Base())
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		c.libraryDecorator.androidMkWriteExportedFlags(entries)
+		_, _, ext := android.SplitFileExt(entries.OutputFile.Path().Base())
 
-		fmt.Fprintln(w, "LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE)"+ext)
-		fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
-		fmt.Fprintln(w, "LOCAL_NO_NOTICE_FILE := true")
-		fmt.Fprintln(w, "LOCAL_SOONG_TOC :=", c.toc().String())
+		entries.SetString("LOCAL_BUILT_MODULE_STEM", "$(LOCAL_MODULE)"+ext)
+		entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
+		entries.SetBool("LOCAL_NO_NOTICE_FILE", true)
+		entries.SetString("LOCAL_SOONG_TOC", c.toc().String())
 	})
 }
 
-func (c *vndkPrebuiltLibraryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Class = "SHARED_LIBRARIES"
+func (c *vndkPrebuiltLibraryDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.Class = "SHARED_LIBRARIES"
 
-	ret.SubName = c.androidMkSuffix
+	entries.SubName = c.androidMkSuffix
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		c.libraryDecorator.androidMkWriteExportedFlags(w)
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		c.libraryDecorator.androidMkWriteExportedFlags(entries)
 
 		path, file := filepath.Split(c.path.ToMakePath().String())
 		stem, suffix, ext := android.SplitFileExt(file)
-		fmt.Fprintln(w, "LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE)"+ext)
-		fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := "+suffix)
-		fmt.Fprintln(w, "LOCAL_MODULE_PATH := "+path)
-		fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+stem)
+		entries.SetString("LOCAL_BUILT_MODULE_STEM", "$(LOCAL_MODULE)"+ext)
+		entries.SetString("LOCAL_MODULE_SUFFIX", suffix)
+		entries.SetString("LOCAL_MODULE_PATH", path)
+		entries.SetString("LOCAL_MODULE_STEM", stem)
 		if c.tocFile.Valid() {
-			fmt.Fprintln(w, "LOCAL_SOONG_TOC := "+c.tocFile.String())
+			entries.SetString("LOCAL_SOONG_TOC", c.tocFile.String())
 		}
 	})
 }
 
-func (c *vendorSnapshotLibraryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+func (c *vendorSnapshotLibraryDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
 	// Each vendor snapshot is exported to androidMk only when BOARD_VNDK_VERSION != current
 	// and the version of the prebuilt is same as BOARD_VNDK_VERSION.
 	if c.shared() {
-		ret.Class = "SHARED_LIBRARIES"
+		entries.Class = "SHARED_LIBRARIES"
 	} else if c.static() {
-		ret.Class = "STATIC_LIBRARIES"
+		entries.Class = "STATIC_LIBRARIES"
 	} else if c.header() {
-		ret.Class = "HEADER_LIBRARIES"
+		entries.Class = "HEADER_LIBRARIES"
 	}
 
 	if c.androidMkVendorSuffix {
-		ret.SubName = vendorSuffix
+		entries.SubName = vendorSuffix
 	} else {
-		ret.SubName = ""
+		entries.SubName = ""
 	}
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		c.libraryDecorator.androidMkWriteExportedFlags(w)
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		c.libraryDecorator.androidMkWriteExportedFlags(entries)
 
 		if c.shared() || c.static() {
 			path, file := filepath.Split(c.path.ToMakePath().String())
 			stem, suffix, ext := android.SplitFileExt(file)
-			fmt.Fprintln(w, "LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE)"+ext)
-			fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := "+suffix)
-			fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+stem)
+			entries.SetString("LOCAL_BUILT_MODULE_STEM", "$(LOCAL_MODULE)"+ext)
+			entries.SetString("LOCAL_MODULE_SUFFIX", suffix)
+			entries.SetString("LOCAL_MODULE_STEM", stem)
 			if c.shared() {
-				fmt.Fprintln(w, "LOCAL_MODULE_PATH := "+path)
+				entries.SetString("LOCAL_MODULE_PATH", path)
 			}
 			if c.tocFile.Valid() {
-				fmt.Fprintln(w, "LOCAL_SOONG_TOC := "+c.tocFile.String())
+				entries.SetString("LOCAL_SOONG_TOC", c.tocFile.String())
 			}
 		}
 
 		if !c.shared() { // static or header
-			fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
+			entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
 		}
 	})
 }
 
-func (c *vendorSnapshotBinaryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Class = "EXECUTABLES"
+func (c *vendorSnapshotBinaryDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.Class = "EXECUTABLES"
 
 	if c.androidMkVendorSuffix {
-		ret.SubName = vendorSuffix
+		entries.SubName = vendorSuffix
 	} else {
-		ret.SubName = ""
+		entries.SubName = ""
 	}
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		fmt.Fprintln(w, "LOCAL_MODULE_SYMLINKS := "+strings.Join(c.Properties.Symlinks, " "))
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		entries.AddStrings("LOCAL_MODULE_SYMLINKS", c.Properties.Symlinks...)
 	})
 }
 
-func (c *ndkPrebuiltStlLinker) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Class = "SHARED_LIBRARIES"
+func (c *ndkPrebuiltStlLinker) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.Class = "SHARED_LIBRARIES"
 }
 
-func (c *vendorPublicLibraryStubDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Class = "SHARED_LIBRARIES"
-	ret.SubName = vendorPublicLibrarySuffix
+func (c *vendorPublicLibraryStubDecorator) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.Class = "SHARED_LIBRARIES"
+	entries.SubName = vendorPublicLibrarySuffix
 
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		c.libraryDecorator.androidMkWriteExportedFlags(w)
-		_, _, ext := android.SplitFileExt(outputFile.Base())
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+		c.libraryDecorator.androidMkWriteExportedFlags(entries)
+		_, _, ext := android.SplitFileExt(entries.OutputFile.Path().Base())
 
-		fmt.Fprintln(w, "LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE)"+ext)
-		fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
-		fmt.Fprintln(w, "LOCAL_NO_NOTICE_FILE := true")
+		entries.SetString("LOCAL_BUILT_MODULE_STEM", "$(LOCAL_MODULE)"+ext)
+		entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
+		entries.SetBool("LOCAL_NO_NOTICE_FILE", true)
 	})
 }
 
-func (p *prebuiltLinker) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
+func (p *prebuiltLinker) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		if p.properties.Check_elf_files != nil {
-			fmt.Fprintln(w, "LOCAL_CHECK_ELF_FILES :=", *p.properties.Check_elf_files)
+			entries.SetBool("LOCAL_CHECK_ELF_FILES", *p.properties.Check_elf_files)
 		} else {
 			// soong_cc_prebuilt.mk does not include check_elf_file.mk by default
 			// because cc_library_shared and cc_binary use soong_cc_prebuilt.mk as well.
 			// In order to turn on prebuilt ABI checker, set `LOCAL_CHECK_ELF_FILES` to
 			// true if `p.properties.Check_elf_files` is not specified.
-			fmt.Fprintln(w, "LOCAL_CHECK_ELF_FILES := true")
+			entries.SetBool("LOCAL_CHECK_ELF_FILES", true)
 		}
 	})
 }
 
-func (p *prebuiltLibraryLinker) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ctx.subAndroidMk(ret, p.libraryDecorator)
+func (p *prebuiltLibraryLinker) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	ctx.subAndroidMk(entries, p.libraryDecorator)
 	if p.shared() {
-		ctx.subAndroidMk(ret, &p.prebuiltLinker)
-		androidMkWriteAllowUndefinedSymbols(p.baseLinker, ret)
+		ctx.subAndroidMk(entries, &p.prebuiltLinker)
+		androidMkWriteAllowUndefinedSymbols(p.baseLinker, entries)
 	}
 }
 
-func (p *prebuiltBinaryLinker) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ctx.subAndroidMk(ret, p.binaryDecorator)
-	ctx.subAndroidMk(ret, &p.prebuiltLinker)
-	androidMkWriteAllowUndefinedSymbols(p.baseLinker, ret)
+func (p *prebuiltBinaryLinker) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
+	ctx.subAndroidMk(entries, p.binaryDecorator)
+	ctx.subAndroidMk(entries, &p.prebuiltLinker)
+	androidMkWriteAllowUndefinedSymbols(p.baseLinker, entries)
 }
 
-func androidMkWriteAllowUndefinedSymbols(linker *baseLinker, ret *android.AndroidMkData) {
-	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-		allow := linker.Properties.Allow_undefined_symbols
-		if allow != nil {
-			fmt.Fprintln(w, "LOCAL_ALLOW_UNDEFINED_SYMBOLS :=", *allow)
-		}
-	})
+func androidMkWriteAllowUndefinedSymbols(linker *baseLinker, entries *android.AndroidMkEntries) {
+	allow := linker.Properties.Allow_undefined_symbols
+	if allow != nil {
+		entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
+			entries.SetBool("LOCAL_ALLOW_UNDEFINED_SYMBOLS", *allow)
+		})
+	}
 }
diff --git a/cc/binary_sdk_member.go b/cc/binary_sdk_member.go
index 53bc065..58d6ad0 100644
--- a/cc/binary_sdk_member.go
+++ b/cc/binary_sdk_member.go
@@ -16,6 +16,7 @@
 
 import (
 	"path/filepath"
+	"strings"
 
 	"android/soong/android"
 	"github.com/google/blueprint"
@@ -98,7 +99,23 @@
 
 func buildSharedNativeBinarySnapshot(info *nativeBinaryInfo, builder android.SnapshotBuilder, member android.SdkMember) {
 	pbm := builder.AddPrebuiltModule(member, "cc_prebuilt_binary")
-	pbm.AddProperty("compile_multilib", "both")
+	archVariantCount := len(info.archVariantProperties)
+
+	// Choose setting for compile_multilib that is appropriate for the arch variants supplied.
+	var multilib string
+	if archVariantCount == 2 {
+		multilib = "both"
+	} else if archVariantCount == 1 {
+		if strings.HasSuffix(info.archVariantProperties[0].archType, "64") {
+			multilib = "64"
+		} else {
+			multilib = "32"
+		}
+	}
+	if multilib != "" {
+		pbm.AddProperty("compile_multilib", multilib)
+	}
+
 	archProperties := pbm.AddPropertySet("arch")
 	for _, av := range info.archVariantProperties {
 		archTypeProperties := archProperties.AddPropertySet(av.archType)
diff --git a/cc/library.go b/cc/library.go
index bca9a96..6ffb7fc 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -183,7 +183,6 @@
 	ctx.RegisterModuleType("cc_library", LibraryFactory)
 	ctx.RegisterModuleType("cc_library_host_static", LibraryHostStaticFactory)
 	ctx.RegisterModuleType("cc_library_host_shared", LibraryHostSharedFactory)
-	ctx.RegisterModuleType("cc_library_headers", LibraryHeaderFactory)
 }
 
 // cc_library creates both static and/or shared libraries for a device and/or
@@ -233,16 +232,6 @@
 	return module.Init()
 }
 
-// cc_library_headers contains a set of c/c++ headers which are imported by
-// other soong cc modules using the header_libs property. For best practices,
-// use export_include_dirs property or LOCAL_EXPORT_C_INCLUDE_DIRS for
-// Make.
-func LibraryHeaderFactory() android.Module {
-	module, library := NewLibrary(android.HostAndDeviceSupported)
-	library.HeaderOnly()
-	return module.Init()
-}
-
 type flagExporter struct {
 	Properties FlagExporterProperties
 
@@ -1314,22 +1303,28 @@
 	if cc_prebuilt {
 		library := mctx.Module().(*Module).linker.(prebuiltLibraryInterface)
 
-		// Always create both the static and shared variants for prebuilt libraries, and then disable the one
-		// that is not being used.  This allows them to share the name of a cc_library module, which requires that
-		// all the variants of the cc_library also exist on the prebuilt.
-		modules := mctx.CreateLocalVariations("static", "shared")
-		static := modules[0].(*Module)
-		shared := modules[1].(*Module)
+		// Differentiate between header only and building an actual static/shared library
+		if library.buildStatic() || library.buildShared() {
+			// Always create both the static and shared variants for prebuilt libraries, and then disable the one
+			// that is not being used.  This allows them to share the name of a cc_library module, which requires that
+			// all the variants of the cc_library also exist on the prebuilt.
+			modules := mctx.CreateLocalVariations("static", "shared")
+			static := modules[0].(*Module)
+			shared := modules[1].(*Module)
 
-		static.linker.(prebuiltLibraryInterface).setStatic()
-		shared.linker.(prebuiltLibraryInterface).setShared()
+			static.linker.(prebuiltLibraryInterface).setStatic()
+			shared.linker.(prebuiltLibraryInterface).setShared()
 
-		if !library.buildStatic() {
-			static.linker.(prebuiltLibraryInterface).disablePrebuilt()
+			if !library.buildStatic() {
+				static.linker.(prebuiltLibraryInterface).disablePrebuilt()
+			}
+			if !library.buildShared() {
+				shared.linker.(prebuiltLibraryInterface).disablePrebuilt()
+			}
+		} else {
+			// Header only
 		}
-		if !library.buildShared() {
-			shared.linker.(prebuiltLibraryInterface).disablePrebuilt()
-		}
+
 	} else if library, ok := mctx.Module().(LinkableInterface); ok && library.CcLibraryInterface() {
 
 		// Non-cc.Modules may need an empty variant for their mutators.
diff --git a/cc/library_headers.go b/cc/library_headers.go
new file mode 100644
index 0000000..88cf7af
--- /dev/null
+++ b/cc/library_headers.go
@@ -0,0 +1,56 @@
+// Copyright 2020 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 "android/soong/android"
+
+func init() {
+	RegisterLibraryHeadersBuildComponents(android.InitRegistrationContext)
+
+	// Register sdk member types.
+	android.RegisterSdkMemberType(headersLibrarySdkMemberType)
+}
+
+var headersLibrarySdkMemberType = &librarySdkMemberType{
+	SdkMemberTypeBase: android.SdkMemberTypeBase{
+		PropertyName: "native_header_libs",
+		SupportsSdk:  true,
+	},
+	prebuiltModuleType: "cc_prebuilt_library_headers",
+	linkTypes:          nil,
+}
+
+func RegisterLibraryHeadersBuildComponents(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("cc_library_headers", LibraryHeaderFactory)
+	ctx.RegisterModuleType("cc_prebuilt_library_headers", prebuiltLibraryHeaderFactory)
+}
+
+// cc_library_headers contains a set of c/c++ headers which are imported by
+// other soong cc modules using the header_libs property. For best practices,
+// use export_include_dirs property or LOCAL_EXPORT_C_INCLUDE_DIRS for
+// Make.
+func LibraryHeaderFactory() android.Module {
+	module, library := NewLibrary(android.HostAndDeviceSupported)
+	library.HeaderOnly()
+	module.sdkMemberTypes = []android.SdkMemberType{headersLibrarySdkMemberType}
+	return module.Init()
+}
+
+// cc_prebuilt_library_headers is a prebuilt version of cc_library_headers
+func prebuiltLibraryHeaderFactory() android.Module {
+	module, library := NewPrebuiltLibrary(android.HostAndDeviceSupported)
+	library.HeaderOnly()
+	return module.Init()
+}
diff --git a/cc/library_headers_test.go b/cc/library_headers_test.go
new file mode 100644
index 0000000..564ef61
--- /dev/null
+++ b/cc/library_headers_test.go
@@ -0,0 +1,62 @@
+// Copyright 2020 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 (
+	"strings"
+	"testing"
+)
+
+func TestLibraryHeaders(t *testing.T) {
+	ctx := testCc(t, `
+	cc_library_headers {
+		name: "headers",
+		export_include_dirs: ["my_include"],
+	}
+	cc_library_static {
+		name: "lib",
+		srcs: ["foo.c"],
+		header_libs: ["headers"],
+	}
+	`)
+
+	// test if header search paths are correctly added
+	cc := ctx.ModuleForTests("lib", "android_arm64_armv8-a_static").Rule("cc")
+	cflags := cc.Args["cFlags"]
+	if !strings.Contains(cflags, " -Imy_include ") {
+		t.Errorf("cflags for libsystem must contain -Imy_include, but was %#v.", cflags)
+	}
+}
+
+func TestPrebuiltLibraryHeaders(t *testing.T) {
+	ctx := testCc(t, `
+	cc_prebuilt_library_headers {
+		name: "headers",
+		export_include_dirs: ["my_include"],
+	}
+	cc_library_static {
+		name: "lib",
+		srcs: ["foo.c"],
+		header_libs: ["headers"],
+	}
+	`)
+
+	// test if header search paths are correctly added
+	cc := ctx.ModuleForTests("lib", "android_arm64_armv8-a_static").Rule("cc")
+	cflags := cc.Args["cFlags"]
+	if !strings.Contains(cflags, " -Imy_include ") {
+		t.Errorf("cflags for libsystem must contain -Imy_include, but was %#v.", cflags)
+	}
+}
diff --git a/cc/library_sdk_member.go b/cc/library_sdk_member.go
index dd097cf..a36917e 100644
--- a/cc/library_sdk_member.go
+++ b/cc/library_sdk_member.go
@@ -65,12 +65,19 @@
 			if version == "" {
 				version = LatestStubsVersionFor(mctx.Config(), name)
 			}
-			for _, linkType := range mt.linkTypes {
+			if mt.linkTypes == nil {
 				mctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
 					{Mutator: "image", Variation: android.CoreVariation},
-					{Mutator: "link", Variation: linkType},
 					{Mutator: "version", Variation: version},
 				}...), dependencyTag, name)
+			} else {
+				for _, linkType := range mt.linkTypes {
+					mctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
+						{Mutator: "image", Variation: android.CoreVariation},
+						{Mutator: "link", Variation: linkType},
+						{Mutator: "version", Variation: version},
+					}...), dependencyTag, name)
+				}
 			}
 		}
 	}
@@ -92,7 +99,7 @@
 // copy exported header files and stub *.so files
 func (mt *librarySdkMemberType) BuildSnapshot(sdkModuleContext android.ModuleContext, builder android.SnapshotBuilder, member android.SdkMember) {
 	info := mt.organizeVariants(member)
-	buildSharedNativeLibSnapshot(sdkModuleContext, info, builder, member)
+	info.generatePrebuiltLibrary(sdkModuleContext, builder, member)
 }
 
 // Organize the variants by architecture.
@@ -197,85 +204,148 @@
 	}
 }
 
-func buildSharedNativeLibSnapshot(sdkModuleContext android.ModuleContext, info *nativeLibInfo, builder android.SnapshotBuilder, member android.SdkMember) {
-	// a function for emitting include dirs
-	addExportedDirCopyCommandsForNativeLibs := func(lib nativeLibInfoProperties) {
-		// Do not include exportedGeneratedIncludeDirs in the list of directories whose
-		// contents are copied as they are copied from exportedGeneratedHeaders below.
-		includeDirs := lib.ExportedIncludeDirs
-		includeDirs = append(includeDirs, lib.ExportedSystemIncludeDirs...)
-		for _, dir := range includeDirs {
-			// lib.ArchType is "" for common properties.
-			targetDir := filepath.Join(lib.archType, nativeIncludeDir)
-
-			// TODO(jiyong) copy headers having other suffixes
-			headers, _ := sdkModuleContext.GlobWithDeps(dir.String()+"/**/*.h", nil)
-			for _, file := range headers {
-				src := android.PathForSource(sdkModuleContext, file)
-				dest := filepath.Join(targetDir, file)
-				builder.CopyToSnapshot(src, dest)
-			}
-		}
-
-		genHeaders := lib.exportedGeneratedHeaders
-		for _, file := range genHeaders {
-			// lib.ArchType is "" for common properties.
-			targetDir := filepath.Join(lib.archType, nativeGeneratedIncludeDir)
-
-			dest := filepath.Join(targetDir, lib.name, file.Rel())
-			builder.CopyToSnapshot(file, dest)
-		}
-	}
-
-	addExportedDirCopyCommandsForNativeLibs(info.commonProperties)
-
-	// for each architecture
-	for _, av := range info.archVariantProperties {
-		builder.CopyToSnapshot(av.outputFile, nativeLibraryPathFor(av))
-
-		addExportedDirCopyCommandsForNativeLibs(av)
-	}
-
-	info.generatePrebuiltLibrary(sdkModuleContext, builder, member)
-}
-
 func (info *nativeLibInfo) generatePrebuiltLibrary(sdkModuleContext android.ModuleContext, builder android.SnapshotBuilder, member android.SdkMember) {
 
 	pbm := builder.AddPrebuiltModule(member, info.memberType.prebuiltModuleType)
 
-	addPossiblyArchSpecificProperties(info.commonProperties, pbm)
+	addPossiblyArchSpecificProperties(sdkModuleContext, builder, info.commonProperties, pbm)
 
 	archProperties := pbm.AddPropertySet("arch")
 	for _, av := range info.archVariantProperties {
 		archTypeProperties := archProperties.AddPropertySet(av.archType)
-		// Add any arch specific properties inside the appropriate arch: {<arch>: {...}} block
-		archTypeProperties.AddProperty("srcs", []string{nativeLibraryPathFor(av)})
 
-		addPossiblyArchSpecificProperties(av, archTypeProperties)
+		// If the library has some link types then it produces an output binary file, otherwise it
+		// is header only.
+		if info.memberType.linkTypes != nil {
+			// Copy the generated library to the snapshot and add a reference to it in the .bp module.
+			nativeLibraryPath := nativeLibraryPathFor(av)
+			builder.CopyToSnapshot(av.outputFile, nativeLibraryPath)
+			archTypeProperties.AddProperty("srcs", []string{nativeLibraryPath})
+		}
+
+		// Add any arch specific properties inside the appropriate arch: {<arch>: {...}} block
+		addPossiblyArchSpecificProperties(sdkModuleContext, builder, av, archTypeProperties)
 	}
 	pbm.AddProperty("stl", "none")
 	pbm.AddProperty("system_shared_libs", []string{})
 }
 
-// Add properties that may, or may not, be arch specific.
-func addPossiblyArchSpecificProperties(libInfo nativeLibInfoProperties, outputProperties android.BpPropertySet) {
-	addExportedDirsForNativeLibs(libInfo, outputProperties, false /*systemInclude*/)
-	addExportedDirsForNativeLibs(libInfo, outputProperties, true /*systemInclude*/)
+type includeDirsProperty struct {
+	// Accessor to retrieve the paths
+	pathsGetter func(libInfo nativeLibInfoProperties) android.Paths
+
+	// The name of the property in the prebuilt library, "" means there is no property.
+	propertyName string
+
+	// The directory within the snapshot directory into which items should be copied.
+	snapshotDir string
+
+	// True if the items on the path should be copied.
+	copy bool
+
+	// True if the paths represent directories, files if they represent files.
+	dirs bool
 }
 
-// a function for emitting include dirs
-func addExportedDirsForNativeLibs(lib nativeLibInfoProperties, properties android.BpPropertySet, systemInclude bool) {
-	includeDirs := nativeIncludeDirPathsFor(lib, systemInclude)
-	if len(includeDirs) == 0 {
-		return
+var includeDirProperties = []includeDirsProperty{
+	{
+		// ExportedIncludeDirs lists directories that contains some header files to be
+		// copied into a directory in the snapshot. The snapshot directories must be added to
+		// the export_include_dirs property in the prebuilt module in the snapshot.
+		pathsGetter:  func(libInfo nativeLibInfoProperties) android.Paths { return libInfo.ExportedIncludeDirs },
+		propertyName: "export_include_dirs",
+		snapshotDir:  nativeIncludeDir,
+		copy:         true,
+		dirs:         true,
+	},
+	{
+		// ExportedSystemIncludeDirs lists directories that contains some system header files to
+		// be copied into a directory in the snapshot. The snapshot directories must be added to
+		// the export_system_include_dirs property in the prebuilt module in the snapshot.
+		pathsGetter:  func(libInfo nativeLibInfoProperties) android.Paths { return libInfo.ExportedSystemIncludeDirs },
+		propertyName: "export_system_include_dirs",
+		snapshotDir:  nativeIncludeDir,
+		copy:         true,
+		dirs:         true,
+	},
+	{
+		// exportedGeneratedIncludeDirs lists directories that contains some header files
+		// that are explicitly listed in the exportedGeneratedHeaders property. So, the contents
+		// of these directories do not need to be copied, but these directories do need adding to
+		// the export_include_dirs property in the prebuilt module in the snapshot.
+		pathsGetter:  func(libInfo nativeLibInfoProperties) android.Paths { return libInfo.exportedGeneratedIncludeDirs },
+		propertyName: "export_include_dirs",
+		snapshotDir:  nativeGeneratedIncludeDir,
+		copy:         false,
+		dirs:         true,
+	},
+	{
+		// exportedGeneratedHeaders lists header files that are in one of the directories
+		// specified in exportedGeneratedIncludeDirs must be copied into the snapshot.
+		// As they are in a directory in exportedGeneratedIncludeDirs they do not need adding to a
+		// property in the prebuilt module in the snapshot.
+		pathsGetter:  func(libInfo nativeLibInfoProperties) android.Paths { return libInfo.exportedGeneratedHeaders },
+		propertyName: "",
+		snapshotDir:  nativeGeneratedIncludeDir,
+		copy:         true,
+		dirs:         false,
+	},
+}
+
+// Add properties that may, or may not, be arch specific.
+func addPossiblyArchSpecificProperties(sdkModuleContext android.ModuleContext, builder android.SnapshotBuilder, libInfo nativeLibInfoProperties, outputProperties android.BpPropertySet) {
+
+	// Map from property name to the include dirs to add to the prebuilt module in the snapshot.
+	includeDirs := make(map[string][]string)
+
+	// Iterate over each include directory property, copying files and collating property
+	// values where necessary.
+	for _, propertyInfo := range includeDirProperties {
+		// Calculate the base directory in the snapshot into which the files will be copied.
+		// lib.ArchType is "" for common properties.
+		targetDir := filepath.Join(libInfo.archType, propertyInfo.snapshotDir)
+
+		propertyName := propertyInfo.propertyName
+
+		// Iterate over each path in one of the include directory properties.
+		for _, path := range propertyInfo.pathsGetter(libInfo) {
+
+			// Copy the files/directories when necessary.
+			if propertyInfo.copy {
+				if propertyInfo.dirs {
+					// When copying a directory glob and copy all the headers within it.
+					// TODO(jiyong) copy headers having other suffixes
+					headers, _ := sdkModuleContext.GlobWithDeps(path.String()+"/**/*.h", nil)
+					for _, file := range headers {
+						src := android.PathForSource(sdkModuleContext, file)
+						dest := filepath.Join(targetDir, file)
+						builder.CopyToSnapshot(src, dest)
+					}
+				} else {
+					// Otherwise, just copy the files.
+					dest := filepath.Join(targetDir, libInfo.name, path.Rel())
+					builder.CopyToSnapshot(path, dest)
+				}
+			}
+
+			// Only directories are added to a property.
+			if propertyInfo.dirs {
+				var snapshotPath string
+				if isGeneratedHeaderDirectory(path) {
+					snapshotPath = filepath.Join(targetDir, libInfo.name)
+				} else {
+					snapshotPath = filepath.Join(targetDir, path.String())
+				}
+
+				includeDirs[propertyName] = append(includeDirs[propertyName], snapshotPath)
+			}
+		}
 	}
-	var propertyName string
-	if !systemInclude {
-		propertyName = "export_include_dirs"
-	} else {
-		propertyName = "export_system_include_dirs"
+
+	// Add the collated include dir properties to the output.
+	for property, dirs := range includeDirs {
+		outputProperties.AddProperty(property, dirs)
 	}
-	properties.AddProperty(propertyName, includeDirs)
 }
 
 const (
@@ -290,31 +360,6 @@
 		nativeStubDir, lib.outputFile.Base())
 }
 
-// paths to the include dirs of a native shared library. Relative to <sdk_root>/<api_dir>
-func nativeIncludeDirPathsFor(lib nativeLibInfoProperties, systemInclude bool) []string {
-	var result []string
-	var includeDirs []android.Path
-	if !systemInclude {
-		// Include the generated include dirs in the exported include dirs.
-		includeDirs = append(lib.ExportedIncludeDirs, lib.exportedGeneratedIncludeDirs...)
-	} else {
-		includeDirs = lib.ExportedSystemIncludeDirs
-	}
-	for _, dir := range includeDirs {
-		var path string
-		if isGeneratedHeaderDirectory(dir) {
-			path = filepath.Join(nativeGeneratedIncludeDir, lib.name)
-		} else {
-			path = filepath.Join(nativeIncludeDir, dir.String())
-		}
-
-		// lib.ArchType is "" for common properties.
-		path = filepath.Join(lib.archType, path)
-		result = append(result, path)
-	}
-	return result
-}
-
 // nativeLibInfoProperties represents properties of a native lib
 //
 // The exported (capitalized) fields will be examined and may be changed during common value extraction.
diff --git a/cc/prebuilt.go b/cc/prebuilt.go
index b0cf489..2c18ac3 100644
--- a/cc/prebuilt.go
+++ b/cc/prebuilt.go
@@ -87,15 +87,16 @@
 
 func (p *prebuiltLibraryLinker) link(ctx ModuleContext,
 	flags Flags, deps PathDeps, objs Objects) android.Path {
+
+	p.libraryDecorator.exportIncludes(ctx)
+	p.libraryDecorator.reexportDirs(deps.ReexportedDirs...)
+	p.libraryDecorator.reexportSystemDirs(deps.ReexportedSystemDirs...)
+	p.libraryDecorator.reexportFlags(deps.ReexportedFlags...)
+	p.libraryDecorator.reexportDeps(deps.ReexportedDeps...)
+	p.libraryDecorator.addExportedGeneratedHeaders(deps.ReexportedGeneratedHeaders...)
+
 	// TODO(ccross): verify shared library dependencies
 	if len(p.properties.Srcs) > 0 {
-		p.libraryDecorator.exportIncludes(ctx)
-		p.libraryDecorator.reexportDirs(deps.ReexportedDirs...)
-		p.libraryDecorator.reexportSystemDirs(deps.ReexportedSystemDirs...)
-		p.libraryDecorator.reexportFlags(deps.ReexportedFlags...)
-		p.libraryDecorator.reexportDeps(deps.ReexportedDeps...)
-		p.libraryDecorator.addExportedGeneratedHeaders(deps.ReexportedGeneratedHeaders...)
-
 		builderFlags := flagsToBuilderFlags(flags)
 
 		in := p.Prebuilt.SingleSourcePath(ctx)
diff --git a/cc/sanitize.go b/cc/sanitize.go
index 5ea8ee08..6e809bf 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -609,18 +609,18 @@
 	return flags
 }
 
-func (sanitize *sanitize) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+func (sanitize *sanitize) AndroidMkEntries(ctx AndroidMkContext, entries *android.AndroidMkEntries) {
 	// Add a suffix for cfi/hwasan/scs-enabled static/header libraries to allow surfacing
 	// both the sanitized and non-sanitized variants to make without a name conflict.
-	if ret.Class == "STATIC_LIBRARIES" || ret.Class == "HEADER_LIBRARIES" {
+	if entries.Class == "STATIC_LIBRARIES" || entries.Class == "HEADER_LIBRARIES" {
 		if Bool(sanitize.Properties.Sanitize.Cfi) {
-			ret.SubName += ".cfi"
+			entries.SubName += ".cfi"
 		}
 		if Bool(sanitize.Properties.Sanitize.Hwaddress) {
-			ret.SubName += ".hwasan"
+			entries.SubName += ".hwasan"
 		}
 		if Bool(sanitize.Properties.Sanitize.Scs) {
-			ret.SubName += ".scs"
+			entries.SubName += ".scs"
 		}
 	}
 }
diff --git a/cc/snapshot_utils.go b/cc/snapshot_utils.go
index 8f48f86..73388ce 100644
--- a/cc/snapshot_utils.go
+++ b/cc/snapshot_utils.go
@@ -117,6 +117,17 @@
 	return outPath
 }
 
+func combineNotices(ctx android.SingletonContext, paths android.Paths, out string) android.OutputPath {
+	outPath := android.PathForOutput(ctx, out)
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        android.Cat,
+		Inputs:      paths,
+		Output:      outPath,
+		Description: "combine notices for " + out,
+	})
+	return outPath
+}
+
 func writeStringToFile(ctx android.SingletonContext, content, out string) android.OutputPath {
 	outPath := android.PathForOutput(ctx, out)
 	ctx.Build(pctx, android.BuildParams{
diff --git a/cc/test.go b/cc/test.go
index 05e6fe5..1085d3a 100644
--- a/cc/test.go
+++ b/cc/test.go
@@ -49,7 +49,7 @@
 
 	// list of files or filegroup modules that provide data that should be installed alongside
 	// the test
-	Data []string `android:"path"`
+	Data []string `android:"path,arch_variant"`
 
 	// list of compatibility suites (for example "cts", "vts") that the module should be
 	// installed into.
diff --git a/cc/testing.go b/cc/testing.go
index 7b0305f..a22763a 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -25,6 +25,7 @@
 	RegisterCCBuildComponents(ctx)
 	RegisterBinaryBuildComponents(ctx)
 	RegisterLibraryBuildComponents(ctx)
+	RegisterLibraryHeadersBuildComponents(ctx)
 
 	ctx.RegisterModuleType("toolchain_library", ToolchainLibraryFactory)
 	ctx.RegisterModuleType("llndk_library", LlndkLibraryFactory)
@@ -213,6 +214,7 @@
 			stl: "none",
 			vendor_available: true,
 			recovery_available: true,
+			host_supported: true,
 		}
 		cc_library {
 			name: "libc++",
@@ -222,6 +224,7 @@
 			stl: "none",
 			vendor_available: true,
 			recovery_available: true,
+			host_supported: true,
 			vndk: {
 				enabled: true,
 				support_system_process: true,
diff --git a/cc/vendor_snapshot.go b/cc/vendor_snapshot.go
index aed7918..20762a8 100644
--- a/cc/vendor_snapshot.go
+++ b/cc/vendor_snapshot.go
@@ -661,14 +661,14 @@
 			headers = append(headers, exportedHeaders(ctx, l)...)
 		}
 
-		if m.NoticeFile().Valid() {
+		if len(m.NoticeFiles()) > 0 {
 			noticeName := ctx.ModuleName(m) + ".txt"
 			noticeOut := filepath.Join(noticeDir, noticeName)
 			// skip already copied notice file
 			if !installedNotices[noticeOut] {
 				installedNotices[noticeOut] = true
-				snapshotOutputs = append(snapshotOutputs, copyFile(
-					ctx, m.NoticeFile().Path(), noticeOut))
+				snapshotOutputs = append(snapshotOutputs, combineNotices(
+					ctx, m.NoticeFiles(), noticeOut))
 			}
 		}
 	})
diff --git a/cc/vndk.go b/cc/vndk.go
index 4578a7d..d0492fc 100644
--- a/cc/vndk.go
+++ b/cc/vndk.go
@@ -644,13 +644,13 @@
 		moduleNames[stem] = ctx.ModuleName(m)
 		modulePaths[stem] = ctx.ModuleDir(m)
 
-		if m.NoticeFile().Valid() {
+		if len(m.NoticeFiles()) > 0 {
 			noticeName := stem + ".txt"
 			// skip already copied notice file
 			if _, ok := noticeBuilt[noticeName]; !ok {
 				noticeBuilt[noticeName] = true
-				snapshotOutputs = append(snapshotOutputs, copyFile(
-					ctx, m.NoticeFile().Path(), filepath.Join(noticeDir, noticeName)))
+				snapshotOutputs = append(snapshotOutputs, combineNotices(
+					ctx, m.NoticeFiles(), filepath.Join(noticeDir, noticeName)))
 			}
 		}
 
diff --git a/java/app.go b/java/app.go
index bcf08a7..ed4462c 100755
--- a/java/app.go
+++ b/java/app.go
@@ -390,16 +390,20 @@
 			return false
 		}
 
-		path := child.(android.Module).NoticeFile()
-		if path.Valid() {
-			noticePathSet[path.Path()] = true
+		paths := child.(android.Module).NoticeFiles()
+		if len(paths) > 0 {
+			for _, path := range paths {
+				noticePathSet[path] = true
+			}
 		}
 		return true
 	})
 
 	// If the app has one, add it too.
-	if a.NoticeFile().Valid() {
-		noticePathSet[a.NoticeFile().Path()] = true
+	if len(a.NoticeFiles()) > 0 {
+		for _, path := range a.NoticeFiles() {
+			noticePathSet[path] = true
+		}
 	}
 
 	if len(noticePathSet) == 0 {
@@ -491,7 +495,7 @@
 
 	dexJarFile := a.dexBuildActions(ctx)
 
-	jniLibs, certificateDeps := collectAppDeps(ctx, a.shouldEmbedJnis(ctx))
+	jniLibs, certificateDeps := collectAppDeps(ctx, a.shouldEmbedJnis(ctx), !Bool(a.appProperties.Jni_uses_platform_apis))
 	jniJarFile := a.jniBuildActions(jniLibs, ctx)
 
 	if ctx.Failed() {
@@ -527,7 +531,8 @@
 	}
 }
 
-func collectAppDeps(ctx android.ModuleContext, shouldCollectRecursiveNativeDeps bool) ([]jniLib, []Certificate) {
+func collectAppDeps(ctx android.ModuleContext, shouldCollectRecursiveNativeDeps bool,
+	checkNativeSdkVersion bool) ([]jniLib, []Certificate) {
 	var jniLibs []jniLib
 	var certificates []Certificate
 	seenModulePaths := make(map[string]bool)
@@ -549,6 +554,18 @@
 				}
 				seenModulePaths[path.String()] = true
 
+				if checkNativeSdkVersion {
+					if app, ok := ctx.Module().(interface{ sdkVersion() sdkSpec }); ok {
+						if app.sdkVersion().specified() &&
+							app.sdkVersion().kind != sdkCorePlatform &&
+							dep.SdkVersion() == "" {
+							ctx.PropertyErrorf("jni_libs",
+								"JNI dependency %q uses platform APIs, but this module does not",
+								otherName)
+						}
+					}
+				}
+
 				if lib.Valid() {
 					jniLibs = append(jniLibs, jniLib{
 						name:   ctx.OtherModuleName(module),
@@ -1045,7 +1062,7 @@
 		ctx.ModuleErrorf("One and only one of certficate, presigned, and default_dev_cert properties must be set")
 	}
 
-	_, certificates := collectAppDeps(ctx, false)
+	_, certificates := collectAppDeps(ctx, false, false)
 
 	// TODO: LOCAL_EXTRACT_APK/LOCAL_EXTRACT_DPI_APK
 	// TODO: LOCAL_PACKAGE_SPLITS
@@ -1300,7 +1317,7 @@
 	r.aapt.buildActions(ctx, r, "--no-resource-deduping", "--no-resource-removal")
 
 	// Sign the built package
-	_, certificates := collectAppDeps(ctx, false)
+	_, certificates := collectAppDeps(ctx, false, false)
 	certificates = processMainCert(r.ModuleBase, String(r.properties.Certificate), certificates, ctx)
 	signed := android.PathForModuleOut(ctx, "signed", r.Name()+".apk")
 	SignAppPackage(ctx, signed, r.aapt.exportPackage, certificates)
diff --git a/java/app_test.go b/java/app_test.go
index dfd8571..0c6da7a 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -903,6 +903,7 @@
 			name: "libjni",
 			system_shared_libs: [],
 			stl: "none",
+			sdk_version: "current",
 		}
 
 		android_app {
@@ -2112,6 +2113,7 @@
 			system_shared_libs: [],
 			stl: "none",
 			notice: "LIB_NOTICE",
+			sdk_version: "current",
 		}
 
 		java_library {
diff --git a/java/config/config.go b/java/config/config.go
index 7f446e5..54c89cd 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -48,7 +48,7 @@
 		// TODO: Could this be all updatable bootclasspath jars?
 		"updatable-media",
 		"framework-sdkextensions",
-		"ike",
+		"android.net.ipsec.ike",
 	}
 )
 
diff --git a/java/dexpreopt.go b/java/dexpreopt.go
index 4313964..40cfe4f 100644
--- a/java/dexpreopt.go
+++ b/java/dexpreopt.go
@@ -132,28 +132,28 @@
 		bootImage = artBootImageConfig(ctx)
 	}
 
-	var archs []android.ArchType
-	for _, a := range ctx.MultiTargets() {
-		archs = append(archs, a.Arch.ArchType)
-	}
-	if len(archs) == 0 {
+	targets := ctx.MultiTargets()
+	if len(targets) == 0 {
 		// assume this is a java library, dexpreopt for all arches for now
 		for _, target := range ctx.Config().Targets[android.Android] {
 			if target.NativeBridge == android.NativeBridgeDisabled {
-				archs = append(archs, target.Arch.ArchType)
+				targets = append(targets, target)
 			}
 		}
 		if inList(ctx.ModuleName(), global.SystemServerJars) && !d.isSDKLibrary {
 			// If the module is not an SDK library and it's a system server jar, only preopt the primary arch.
-			archs = archs[:1]
+			targets = targets[:1]
 		}
 	}
 
+	var archs []android.ArchType
 	var images android.Paths
 	var imagesDeps []android.OutputPaths
-	for _, arch := range archs {
-		images = append(images, bootImage.images[arch])
-		imagesDeps = append(imagesDeps, bootImage.imagesDeps[arch])
+	for _, target := range targets {
+		archs = append(archs, target.Arch.ArchType)
+		variant := bootImage.getVariant(target)
+		images = append(images, variant.images)
+		imagesDeps = append(imagesDeps, variant.imagesDeps)
 	}
 
 	dexLocation := android.InstallPathToOnDevicePath(ctx, d.installPath)
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 655a476..d7adb40 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -16,7 +16,6 @@
 
 import (
 	"path/filepath"
-	"sort"
 	"strings"
 
 	"android/soong/android"
@@ -48,6 +47,7 @@
 // The location is passed as an argument to the ART tools like dex2oat instead of the real path. The ART tools
 // will then reconstruct the real path, so the rules must have a dependency on the real path.
 
+// Target-independent description of pre-compiled boot image.
 type bootImageConfig struct {
 	// Whether this image is an extension.
 	extension bool
@@ -67,9 +67,6 @@
 	// Subdirectory where the image files are installed.
 	installSubdir string
 
-	// Targets for which the image is generated.
-	targets []android.Target
-
 	// The names of jars that constitute this image.
 	modules []string
 
@@ -84,15 +81,43 @@
 	// The "locations" of the dependency images and in this image.
 	imageLocations []string
 
-	// Paths to image files (grouped by target).
-	images     map[android.ArchType]android.OutputPath  // first image file
-	imagesDeps map[android.ArchType]android.OutputPaths // all files
-
-	// Only for extensions, paths to the primary boot images (grouped by target).
-	primaryImages map[android.ArchType]android.OutputPath
-
 	// File path to a zip archive with all image files (or nil, if not needed).
 	zip android.WritablePath
+
+	// Rules which should be used in make to install the outputs.
+	profileInstalls android.RuleBuilderInstalls
+
+	// Target-dependent fields.
+	variants []*bootImageVariant
+}
+
+// Target-dependent description of pre-compiled boot image.
+type bootImageVariant struct {
+	*bootImageConfig
+
+	// Target for which the image is generated.
+	target android.Target
+
+	// Paths to image files.
+	images     android.OutputPath  // first image file
+	imagesDeps android.OutputPaths // all files
+
+	// Only for extensions, paths to the primary boot images.
+	primaryImages android.OutputPath
+
+	// Rules which should be used in make to install the outputs.
+	installs           android.RuleBuilderInstalls
+	vdexInstalls       android.RuleBuilderInstalls
+	unstrippedInstalls android.RuleBuilderInstalls
+}
+
+func (image bootImageConfig) getVariant(target android.Target) *bootImageVariant {
+	for _, variant := range image.variants {
+		if variant.target.Os == target.Os && variant.target.Arch.ArchType == target.Arch.ArchType {
+			return variant
+		}
+	}
+	return nil
 }
 
 func (image bootImageConfig) moduleName(idx int) string {
@@ -126,28 +151,6 @@
 	return ret
 }
 
-type bootImage struct {
-	bootImageConfig
-
-	installs           map[android.ArchType]android.RuleBuilderInstalls
-	vdexInstalls       map[android.ArchType]android.RuleBuilderInstalls
-	unstrippedInstalls map[android.ArchType]android.RuleBuilderInstalls
-
-	profileInstalls android.RuleBuilderInstalls
-}
-
-func newBootImage(ctx android.PathContext, config bootImageConfig) *bootImage {
-	image := &bootImage{
-		bootImageConfig: config,
-
-		installs:           make(map[android.ArchType]android.RuleBuilderInstalls),
-		vdexInstalls:       make(map[android.ArchType]android.RuleBuilderInstalls),
-		unstrippedInstalls: make(map[android.ArchType]android.RuleBuilderInstalls),
-	}
-
-	return image
-}
-
 func concat(lists ...[]string) []string {
 	var size int
 	for _, l := range lists {
@@ -182,8 +185,8 @@
 }
 
 type dexpreoptBootJars struct {
-	defaultBootImage *bootImage
-	otherImages      []*bootImage
+	defaultBootImage *bootImageConfig
+	otherImages      []*bootImageConfig
 
 	dexpreoptConfigForMake android.WritablePath
 }
@@ -193,10 +196,11 @@
 	if skipDexpreoptBootJars(ctx) {
 		return nil
 	}
-
 	// Include dexpreopt files for the primary boot image.
-	files := artBootImageConfig(ctx).imagesDeps
-
+	files := map[android.ArchType]android.OutputPaths{}
+	for _, variant := range artBootImageConfig(ctx).variants {
+		files[variant.target.Arch.ArchType] = variant.imagesDeps
+	}
 	return files
 }
 
@@ -233,10 +237,8 @@
 	dumpOatRules(ctx, d.defaultBootImage)
 }
 
-// buildBootImage takes a bootImageConfig, creates rules to build it, and returns a *bootImage.
-func buildBootImage(ctx android.SingletonContext, config bootImageConfig) *bootImage {
-	image := newBootImage(ctx, config)
-
+// buildBootImage takes a bootImageConfig, creates rules to build it, and returns the image.
+func buildBootImage(ctx android.SingletonContext, image *bootImageConfig) *bootImageConfig {
 	bootDexJars := make(android.Paths, len(image.modules))
 	ctx.VisitAllModules(func(module android.Module) {
 		// Collect dex jar paths for the modules listed above.
@@ -277,8 +279,8 @@
 	bootFrameworkProfileRule(ctx, image, missingDeps)
 
 	var allFiles android.Paths
-	for _, target := range image.targets {
-		files := buildBootImageRuleForArch(ctx, image, target.Arch.ArchType, profile, missingDeps)
+	for _, variant := range image.variants {
+		files := buildBootImageVariant(ctx, variant, profile, missingDeps)
 		allFiles = append(allFiles, files.Paths()...)
 	}
 
@@ -296,12 +298,13 @@
 	return image
 }
 
-func buildBootImageRuleForArch(ctx android.SingletonContext, image *bootImage,
-	arch android.ArchType, profile android.Path, missingDeps []string) android.WritablePaths {
+func buildBootImageVariant(ctx android.SingletonContext, image *bootImageVariant,
+	profile android.Path, missingDeps []string) android.WritablePaths {
 
 	globalSoong := dexpreopt.GetCachedGlobalSoongConfig(ctx)
 	global := dexpreopt.GetGlobalConfig(ctx)
 
+	arch := image.target.Arch.ArchType
 	symbolsDir := image.symbolsDir.Join(ctx, image.installSubdir, arch.String())
 	symbolsFile := symbolsDir.Join(ctx, image.stem+".oat")
 	outputDir := image.dir.Join(ctx, image.installSubdir, arch.String())
@@ -351,7 +354,7 @@
 	}
 
 	if image.extension {
-		artImage := image.primaryImages[arch]
+		artImage := image.primaryImages
 		cmd.
 			Flag("--runtime-arg").FlagWithInputList("-Xbootclasspath:", image.dexPathsDeps.Paths(), ":").
 			Flag("--runtime-arg").FlagWithList("-Xbootclasspath-locations:", image.dexLocationsDeps, ":").
@@ -426,9 +429,9 @@
 	rule.Build(pctx, ctx, image.name+"JarsDexpreopt_"+arch.String(), "dexpreopt "+image.name+" jars "+arch.String())
 
 	// save output and installed files for makevars
-	image.installs[arch] = rule.Installs()
-	image.vdexInstalls[arch] = vdexInstalls
-	image.unstrippedInstalls[arch] = unstrippedInstalls
+	image.installs = rule.Installs()
+	image.vdexInstalls = vdexInstalls
+	image.unstrippedInstalls = unstrippedInstalls
 
 	return zipFiles
 }
@@ -437,7 +440,7 @@
 It is likely that the boot classpath is inconsistent.
 Rebuild with ART_BOOT_IMAGE_EXTRA_ARGS="--runtime-arg -verbose:verifier" to see verification errors.`
 
-func bootImageProfileRule(ctx android.SingletonContext, image *bootImage, missingDeps []string) android.WritablePath {
+func bootImageProfileRule(ctx android.SingletonContext, image *bootImageConfig, missingDeps []string) android.WritablePath {
 	globalSoong := dexpreopt.GetCachedGlobalSoongConfig(ctx)
 	global := dexpreopt.GetGlobalConfig(ctx)
 
@@ -492,7 +495,7 @@
 
 var bootImageProfileRuleKey = android.NewOnceKey("bootImageProfileRule")
 
-func bootFrameworkProfileRule(ctx android.SingletonContext, image *bootImage, missingDeps []string) android.WritablePath {
+func bootFrameworkProfileRule(ctx android.SingletonContext, image *bootImageConfig, missingDeps []string) android.WritablePath {
 	globalSoong := dexpreopt.GetCachedGlobalSoongConfig(ctx)
 	global := dexpreopt.GetGlobalConfig(ctx)
 
@@ -537,15 +540,10 @@
 
 var bootFrameworkProfileRuleKey = android.NewOnceKey("bootFrameworkProfileRule")
 
-func dumpOatRules(ctx android.SingletonContext, image *bootImage) {
-	var archs []android.ArchType
-	for arch := range image.images {
-		archs = append(archs, arch)
-	}
-	sort.Slice(archs, func(i, j int) bool { return archs[i].String() < archs[j].String() })
-
+func dumpOatRules(ctx android.SingletonContext, image *bootImageConfig) {
 	var allPhonies android.Paths
-	for _, arch := range archs {
+	for _, image := range image.variants {
+		arch := image.target.Arch.ArchType
 		// Create a rule to call oatdump.
 		output := android.PathForOutput(ctx, "boot."+arch.String()+".oatdump.txt")
 		rule := android.NewRuleBuilder()
@@ -554,7 +552,7 @@
 			BuiltTool(ctx, "oatdumpd").
 			FlagWithInputList("--runtime-arg -Xbootclasspath:", image.dexPathsDeps.Paths(), ":").
 			FlagWithList("--runtime-arg -Xbootclasspath-locations:", image.dexLocationsDeps, ":").
-			FlagWithArg("--image=", strings.Join(image.imageLocations, ":")).Implicits(image.imagesDeps[arch].Paths()).
+			FlagWithArg("--image=", strings.Join(image.imageLocations, ":")).Implicits(image.imagesDeps.Paths()).
 			FlagWithOutput("--output=", output).
 			FlagWithArg("--instruction-set=", arch.String())
 		rule.Build(pctx, ctx, "dump-oat-boot-"+arch.String(), "dump oat boot "+arch.String())
@@ -609,20 +607,13 @@
 		var imageNames []string
 		for _, current := range append(d.otherImages, image) {
 			imageNames = append(imageNames, current.name)
-			var arches []android.ArchType
-			for arch, _ := range current.images {
-				arches = append(arches, arch)
-			}
-
-			sort.Slice(arches, func(i, j int) bool { return arches[i].String() < arches[j].String() })
-
-			for _, arch := range arches {
-				sfx := current.name + "_" + arch.String()
-				ctx.Strict("DEXPREOPT_IMAGE_VDEX_BUILT_INSTALLED_"+sfx, current.vdexInstalls[arch].String())
-				ctx.Strict("DEXPREOPT_IMAGE_"+sfx, current.images[arch].String())
-				ctx.Strict("DEXPREOPT_IMAGE_DEPS_"+sfx, strings.Join(current.imagesDeps[arch].Strings(), " "))
-				ctx.Strict("DEXPREOPT_IMAGE_BUILT_INSTALLED_"+sfx, current.installs[arch].String())
-				ctx.Strict("DEXPREOPT_IMAGE_UNSTRIPPED_BUILT_INSTALLED_"+sfx, current.unstrippedInstalls[arch].String())
+			for _, current := range current.variants {
+				sfx := current.name + "_" + current.target.Arch.ArchType.String()
+				ctx.Strict("DEXPREOPT_IMAGE_VDEX_BUILT_INSTALLED_"+sfx, current.vdexInstalls.String())
+				ctx.Strict("DEXPREOPT_IMAGE_"+sfx, current.images.String())
+				ctx.Strict("DEXPREOPT_IMAGE_DEPS_"+sfx, strings.Join(current.imagesDeps.Strings(), " "))
+				ctx.Strict("DEXPREOPT_IMAGE_BUILT_INSTALLED_"+sfx, current.installs.String())
+				ctx.Strict("DEXPREOPT_IMAGE_UNSTRIPPED_BUILT_INSTALLED_"+sfx, current.unstrippedInstalls.String())
 			}
 
 			ctx.Strict("DEXPREOPT_IMAGE_LOCATIONS_"+current.name, strings.Join(current.imageLocations, ":"))
diff --git a/java/dexpreopt_config.go b/java/dexpreopt_config.go
index 28f56d2..a06aec4 100644
--- a/java/dexpreopt_config.go
+++ b/java/dexpreopt_config.go
@@ -146,8 +146,6 @@
 
 		// common to all configs
 		for _, c := range configs {
-			c.targets = targets
-
 			c.dir = deviceDir.Join(ctx, "dex_"+c.name+"jars")
 			c.symbolsDir = deviceDir.Join(ctx, "dex_"+c.name+"jars_unstripped")
 
@@ -166,14 +164,17 @@
 			}
 			c.dexPathsDeps = c.dexPaths
 
-			c.images = make(map[android.ArchType]android.OutputPath)
-			c.imagesDeps = make(map[android.ArchType]android.OutputPaths)
-
+			// Create target-specific variants.
 			for _, target := range targets {
 				arch := target.Arch.ArchType
 				imageDir := c.dir.Join(ctx, c.installSubdir, arch.String())
-				c.images[arch] = imageDir.Join(ctx, imageName)
-				c.imagesDeps[arch] = c.moduleFiles(ctx, imageDir, ".art", ".oat", ".vdex")
+				variant := &bootImageVariant{
+					bootImageConfig: c,
+					target:          target,
+					images:          imageDir.Join(ctx, imageName),
+					imagesDeps:      c.moduleFiles(ctx, imageDir, ".art", ".oat", ".vdex"),
+				}
+				c.variants = append(c.variants, variant)
 			}
 
 			c.zip = c.dir.Join(ctx, c.name+".zip")
@@ -181,19 +182,21 @@
 
 		// specific to the framework config
 		frameworkCfg.dexPathsDeps = append(artCfg.dexPathsDeps, frameworkCfg.dexPathsDeps...)
-		frameworkCfg.primaryImages = artCfg.images
+		for i := range targets {
+			frameworkCfg.variants[i].primaryImages = artCfg.variants[i].images
+		}
 		frameworkCfg.imageLocations = append(artCfg.imageLocations, frameworkCfg.imageLocations...)
 
 		return configs
 	}).(map[string]*bootImageConfig)
 }
 
-func artBootImageConfig(ctx android.PathContext) bootImageConfig {
-	return *genBootImageConfigs(ctx)[artBootImageName]
+func artBootImageConfig(ctx android.PathContext) *bootImageConfig {
+	return genBootImageConfigs(ctx)[artBootImageName]
 }
 
-func defaultBootImageConfig(ctx android.PathContext) bootImageConfig {
-	return *genBootImageConfigs(ctx)[frameworkBootImageName]
+func defaultBootImageConfig(ctx android.PathContext) *bootImageConfig {
+	return genBootImageConfigs(ctx)[frameworkBootImageName]
 }
 
 func defaultBootclasspath(ctx android.PathContext) []string {
diff --git a/java/hiddenapi.go b/java/hiddenapi.go
index 6020aba..884a757 100644
--- a/java/hiddenapi.go
+++ b/java/hiddenapi.go
@@ -28,9 +28,10 @@
 }, "outFlag", "stubAPIFlags")
 
 type hiddenAPI struct {
-	flagsCSVPath    android.Path
-	metadataCSVPath android.Path
 	bootDexJarPath  android.Path
+	flagsCSVPath    android.Path
+	indexCSVPath    android.Path
+	metadataCSVPath android.Path
 }
 
 func (h *hiddenAPI) flagsCSV() android.Path {
@@ -45,17 +46,21 @@
 	return h.bootDexJarPath
 }
 
+func (h *hiddenAPI) indexCSV() android.Path {
+	return h.indexCSVPath
+}
+
 type hiddenAPIIntf interface {
-	flagsCSV() android.Path
-	metadataCSV() android.Path
 	bootDexJar() android.Path
+	flagsCSV() android.Path
+	indexCSV() android.Path
+	metadataCSV() android.Path
 }
 
 var _ hiddenAPIIntf = (*hiddenAPI)(nil)
 
-func (h *hiddenAPI) hiddenAPI(ctx android.ModuleContext, dexJar android.ModuleOutPath, implementationJar android.Path,
-	uncompressDex bool) android.ModuleOutPath {
-
+func (h *hiddenAPI) hiddenAPI(ctx android.ModuleContext, dexJar android.ModuleOutPath,
+	implementationJar android.Path, uncompressDex bool) android.ModuleOutPath {
 	if !ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
 		name := ctx.ModuleName()
 
@@ -77,9 +82,8 @@
 			// Derive the greylist from classes jar.
 			flagsCSV := android.PathForModuleOut(ctx, "hiddenapi", "flags.csv")
 			metadataCSV := android.PathForModuleOut(ctx, "hiddenapi", "metadata.csv")
-			hiddenAPIGenerateCSV(ctx, flagsCSV, metadataCSV, implementationJar)
-			h.flagsCSVPath = flagsCSV
-			h.metadataCSVPath = metadataCSV
+			indexCSV := android.PathForModuleOut(ctx, "hiddenapi", "index.csv")
+			h.hiddenAPIGenerateCSV(ctx, flagsCSV, metadataCSV, indexCSV, implementationJar)
 
 			// If this module is actually on the boot jars list and not providing
 			// hiddenapi information for a module on the boot jars list then encode
@@ -96,9 +100,7 @@
 	return dexJar
 }
 
-func hiddenAPIGenerateCSV(ctx android.ModuleContext, flagsCSV, metadataCSV android.WritablePath,
-	classesJar android.Path) {
-
+func (h *hiddenAPI) hiddenAPIGenerateCSV(ctx android.ModuleContext, flagsCSV, metadataCSV, indexCSV android.WritablePath, classesJar android.Path) {
 	stubFlagsCSV := hiddenAPISingletonPaths(ctx).stubFlags
 
 	ctx.Build(pctx, android.BuildParams{
@@ -112,6 +114,7 @@
 			"stubAPIFlags": stubFlagsCSV.String(),
 		},
 	})
+	h.flagsCSVPath = flagsCSV
 
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        hiddenAPIGenerateCSVRule,
@@ -124,18 +127,26 @@
 			"stubAPIFlags": stubFlagsCSV.String(),
 		},
 	})
+	h.metadataCSVPath = metadataCSV
 
+	rule := android.NewRuleBuilder()
+	rule.Command().
+		BuiltTool(ctx, "merge_csv").
+		FlagWithInput("--zip_input=", classesJar).
+		FlagWithOutput("--output=", indexCSV)
+	rule.Build(pctx, ctx, "merged-hiddenapi-index", "Merged Hidden API index")
+	h.indexCSVPath = indexCSV
 }
 
 var hiddenAPIEncodeDexRule = pctx.AndroidStaticRule("hiddenAPIEncodeDex", blueprint.RuleParams{
-	Command: `rm -rf $tmpDir && mkdir -p $tmpDir && mkdir $tmpDir/dex-input && mkdir $tmpDir/dex-output && ` +
-		`unzip -o -q $in 'classes*.dex' -d $tmpDir/dex-input && ` +
-		`for INPUT_DEX in $$(find $tmpDir/dex-input -maxdepth 1 -name 'classes*.dex' | sort); do ` +
-		`  echo "--input-dex=$${INPUT_DEX}"; ` +
-		`  echo "--output-dex=$tmpDir/dex-output/$$(basename $${INPUT_DEX})"; ` +
-		`done | xargs ${config.HiddenAPI} encode --api-flags=$flagsCsv $hiddenapiFlags && ` +
-		`${config.SoongZipCmd} $soongZipFlags -o $tmpDir/dex.jar -C $tmpDir/dex-output -f "$tmpDir/dex-output/classes*.dex" && ` +
-		`${config.MergeZipsCmd} -D -zipToNotStrip $tmpDir/dex.jar -stripFile "classes*.dex" $out $tmpDir/dex.jar $in`,
+	Command: `rm -rf $tmpDir && mkdir -p $tmpDir && mkdir $tmpDir/dex-input && mkdir $tmpDir/dex-output &&
+		unzip -o -q $in 'classes*.dex' -d $tmpDir/dex-input &&
+		for INPUT_DEX in $$(find $tmpDir/dex-input -maxdepth 1 -name 'classes*.dex' | sort); do
+		  echo "--input-dex=$${INPUT_DEX}";
+		  echo "--output-dex=$tmpDir/dex-output/$$(basename $${INPUT_DEX})";
+		done | xargs ${config.HiddenAPI} encode --api-flags=$flagsCsv $hiddenapiFlags &&
+		${config.SoongZipCmd} $soongZipFlags -o $tmpDir/dex.jar -C $tmpDir/dex-output -f "$tmpDir/dex-output/classes*.dex" &&
+		${config.MergeZipsCmd} -D -zipToNotStrip $tmpDir/dex.jar -stripFile "classes*.dex" -stripFile "**/*.uau" $out $tmpDir/dex.jar $in`,
 	CommandDeps: []string{
 		"${config.HiddenAPI}",
 		"${config.SoongZipCmd}",
@@ -159,9 +170,21 @@
 		tmpOutput = android.PathForModuleOut(ctx, "hiddenapi", "unaligned", "unaligned.jar")
 		tmpDir = android.PathForModuleOut(ctx, "hiddenapi", "unaligned")
 	}
+
+	enforceHiddenApiFlagsToAllMembers := true
 	// If frameworks/base doesn't exist we must be building with the 'master-art' manifest.
 	// Disable assertion that all methods/fields have hidden API flags assigned.
 	if !ctx.Config().FrameworksBaseDirExists(ctx) {
+		enforceHiddenApiFlagsToAllMembers = false
+	}
+	// b/149353192: when a module is instrumented, jacoco adds synthetic members
+	// $jacocoData and $jacocoInit. Since they don't exist when building the hidden API flags,
+	// don't complain when we don't find hidden API flags for the synthetic members.
+	if j, ok := ctx.Module().(*Library); ok && j.shouldInstrument(ctx) {
+		enforceHiddenApiFlagsToAllMembers = false
+	}
+
+	if !enforceHiddenApiFlagsToAllMembers {
 		hiddenapiFlags = "--no-force-assign-all"
 	}
 
diff --git a/java/hiddenapi_singleton.go b/java/hiddenapi_singleton.go
index 7850193..7e7e955 100644
--- a/java/hiddenapi_singleton.go
+++ b/java/hiddenapi_singleton.go
@@ -22,13 +22,15 @@
 
 func init() {
 	android.RegisterSingletonType("hiddenapi", hiddenAPISingletonFactory)
+	android.RegisterSingletonType("hiddenapi_index", hiddenAPIIndexSingletonFactory)
 	android.RegisterModuleType("hiddenapi_flags", hiddenAPIFlagsFactory)
 }
 
 type hiddenAPISingletonPathsStruct struct {
-	stubFlags android.OutputPath
 	flags     android.OutputPath
+	index     android.OutputPath
 	metadata  android.OutputPath
+	stubFlags android.OutputPath
 }
 
 var hiddenAPISingletonPathsKey = android.NewOnceKey("hiddenAPISingletonPathsKey")
@@ -39,9 +41,10 @@
 func hiddenAPISingletonPaths(ctx android.PathContext) hiddenAPISingletonPathsStruct {
 	return ctx.Config().Once(hiddenAPISingletonPathsKey, func() interface{} {
 		return hiddenAPISingletonPathsStruct{
-			stubFlags: android.PathForOutput(ctx, "hiddenapi", "hiddenapi-stub-flags.txt"),
 			flags:     android.PathForOutput(ctx, "hiddenapi", "hiddenapi-flags.csv"),
+			index:     android.PathForOutput(ctx, "hiddenapi", "hiddenapi-index.csv"),
 			metadata:  android.PathForOutput(ctx, "hiddenapi", "hiddenapi-greylist.csv"),
+			stubFlags: android.PathForOutput(ctx, "hiddenapi", "hiddenapi-stub-flags.txt"),
 		}
 	}).(hiddenAPISingletonPathsStruct)
 }
@@ -364,3 +367,45 @@
 	android.InitAndroidArchModule(module, android.HostAndDeviceSupported, android.MultilibCommon)
 	return module
 }
+
+func hiddenAPIIndexSingletonFactory() android.Singleton {
+	return &hiddenAPIIndexSingleton{}
+}
+
+type hiddenAPIIndexSingleton struct {
+	index android.Path
+}
+
+func (h *hiddenAPIIndexSingleton) GenerateBuildActions(ctx android.SingletonContext) {
+	// Don't run any hiddenapi rules if UNSAFE_DISABLE_HIDDENAPI_FLAGS=true
+	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
+		return
+	}
+
+	indexes := android.Paths{}
+	ctx.VisitAllModules(func(module android.Module) {
+		if h, ok := module.(hiddenAPIIntf); ok {
+			if h.indexCSV() != nil {
+				indexes = append(indexes, h.indexCSV())
+			}
+		}
+	})
+
+	rule := android.NewRuleBuilder()
+	rule.Command().
+		BuiltTool(ctx, "merge_csv").
+		FlagWithArg("--header=", "signature,file,startline,startcol,endline,endcol,properties").
+		FlagWithOutput("--output=", hiddenAPISingletonPaths(ctx).index).
+		Inputs(indexes)
+	rule.Build(pctx, ctx, "singleton-merged-hiddenapi-index", "Singleton merged Hidden API index")
+
+	h.index = hiddenAPISingletonPaths(ctx).index
+}
+
+func (h *hiddenAPIIndexSingleton) MakeVars(ctx android.MakeVarsContext) {
+	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
+		return
+	}
+
+	ctx.Strict("INTERNAL_PLATFORM_HIDDENAPI_INDEX", h.index.String())
+}
diff --git a/java/java.go b/java/java.go
index 462dba8..8d58a90 100644
--- a/java/java.go
+++ b/java/java.go
@@ -1323,6 +1323,7 @@
 	j.compiledSrcJars = srcJars
 
 	enable_sharding := false
+	var headerJarFileWithoutJarjar android.Path
 	if ctx.Device() && !ctx.Config().IsEnvFalse("TURBINE_ENABLED") && !deps.disableTurbine {
 		if j.properties.Javac_shard_size != nil && *(j.properties.Javac_shard_size) > 0 {
 			enable_sharding = true
@@ -1332,7 +1333,8 @@
 			// allow for the use of annotation processors that do function correctly
 			// with sharding enabled. See: b/77284273.
 		}
-		j.headerJarFile = j.compileJavaHeader(ctx, uniqueSrcFiles, srcJars, deps, flags, jarName, kotlinJars)
+		headerJarFileWithoutJarjar, j.headerJarFile =
+			j.compileJavaHeader(ctx, uniqueSrcFiles, srcJars, deps, flags, jarName, kotlinJars)
 		if ctx.Failed() {
 			return
 		}
@@ -1351,7 +1353,7 @@
 		}
 
 		if enable_sharding {
-			flags.classpath = append(flags.classpath, j.headerJarFile)
+			flags.classpath = append(flags.classpath, headerJarFileWithoutJarjar)
 			shardSize := int(*(j.properties.Javac_shard_size))
 			var shardSrcs []android.Paths
 			if len(uniqueSrcFiles) > 0 {
@@ -1519,6 +1521,14 @@
 		j.headerJarFile = j.implementationJarFile
 	}
 
+	// Force enable the instrumentation for java code that is built for APEXes ...
+	// except for the jacocoagent itself (because instrumenting jacocoagent using jacocoagent
+	// doesn't make sense)
+	isJacocoAgent := ctx.ModuleName() == "jacocoagent"
+	if android.DirectlyInAnyApex(ctx, ctx.ModuleName()) && !isJacocoAgent && !j.IsForPlatform() {
+		j.properties.Instrument = true
+	}
+
 	if j.shouldInstrument(ctx) {
 		outputFile = j.instrument(ctx, flags, outputFile, jarName)
 	}
@@ -1642,7 +1652,8 @@
 }
 
 func (j *Module) compileJavaHeader(ctx android.ModuleContext, srcFiles, srcJars android.Paths,
-	deps deps, flags javaBuilderFlags, jarName string, extraJars android.Paths) android.Path {
+	deps deps, flags javaBuilderFlags, jarName string,
+	extraJars android.Paths) (headerJar, jarjarHeaderJar android.Path) {
 
 	var jars android.Paths
 	if len(srcFiles) > 0 || len(srcJars) > 0 {
@@ -1650,7 +1661,7 @@
 		turbineJar := android.PathForModuleOut(ctx, "turbine", jarName)
 		TransformJavaToHeaderClasses(ctx, turbineJar, srcFiles, srcJars, flags)
 		if ctx.Failed() {
-			return nil
+			return nil, nil
 		}
 		jars = append(jars, turbineJar)
 	}
@@ -1659,7 +1670,6 @@
 
 	// Combine any static header libraries into classes-header.jar. If there is only
 	// one input jar this step will be skipped.
-	var headerJar android.Path
 	jars = append(jars, deps.staticHeaderJars...)
 
 	// we cannot skip the combine step for now if there is only one jar
@@ -1668,18 +1678,19 @@
 	TransformJarsToJar(ctx, combinedJar, "for turbine", jars, android.OptionalPath{},
 		false, nil, []string{"META-INF/TRANSITIVE"})
 	headerJar = combinedJar
+	jarjarHeaderJar = combinedJar
 
 	if j.expandJarjarRules != nil {
 		// Transform classes.jar into classes-jarjar.jar
 		jarjarFile := android.PathForModuleOut(ctx, "turbine-jarjar", jarName)
 		TransformJarJar(ctx, jarjarFile, headerJar, j.expandJarjarRules)
-		headerJar = jarjarFile
+		jarjarHeaderJar = jarjarFile
 		if ctx.Failed() {
-			return nil
+			return nil, nil
 		}
 	}
 
-	return headerJar
+	return headerJar, jarjarHeaderJar
 }
 
 func (j *Module) instrument(ctx android.ModuleContext, flags javaBuilderFlags,
diff --git a/scripts/jsonmodify.py b/scripts/jsonmodify.py
index 4b2c3c2..ba1109e 100755
--- a/scripts/jsonmodify.py
+++ b/scripts/jsonmodify.py
@@ -112,9 +112,10 @@
 
   if args.out:
     with open(args.out, "w") as f:
-      json.dump(obj, f, indent=2)
+      json.dump(obj, f, indent=2, separators=(',', ': '))
+      f.write('\n')
   else:
-    print(json.dumps(obj, indent=2))
+    print(json.dumps(obj, indent=2, separators=(',', ': ')))
 
 
 if __name__ == '__main__':
diff --git a/sdk/bp.go b/sdk/bp.go
index 6936daf..c2a75e4 100644
--- a/sdk/bp.go
+++ b/sdk/bp.go
@@ -48,8 +48,7 @@
 }
 
 func (s *bpPropertySet) AddPropertySet(name string) android.BpPropertySet {
-	set := &bpPropertySet{}
-	set.init()
+	set := newPropertySet()
 	s.AddProperty(name, set)
 	return set
 }
@@ -62,7 +61,7 @@
 	return s.tags[name]
 }
 
-func (s *bpPropertySet) transform(transformer bpPropertyTransformer) {
+func (s *bpPropertySet) transformContents(transformer bpPropertyTransformer) {
 	var newOrder []string
 	for _, name := range s.order {
 		value := s.properties[name]
@@ -70,7 +69,13 @@
 		var newValue interface{}
 		var newTag android.BpPropertyTag
 		if propertySet, ok := value.(*bpPropertySet); ok {
-			newValue, newTag = transformer.transformPropertySet(name, propertySet, tag)
+			var newPropertySet *bpPropertySet
+			newPropertySet, newTag = transformPropertySet(transformer, name, propertySet, tag)
+			if newPropertySet == nil {
+				newValue = nil
+			} else {
+				newValue = newPropertySet
+			}
 		} else {
 			newValue, newTag = transformer.transformProperty(name, value, tag)
 		}
@@ -88,6 +93,16 @@
 	s.order = newOrder
 }
 
+func transformPropertySet(transformer bpPropertyTransformer, name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
+	newPropertySet, newTag := transformer.transformPropertySetBeforeContents(name, propertySet, tag)
+	if newPropertySet != nil {
+		newPropertySet.transformContents(transformer)
+
+		newPropertySet, newTag = transformer.transformPropertySetAfterContents(name, newPropertySet, newTag)
+	}
+	return newPropertySet, newTag
+}
+
 func (s *bpPropertySet) setProperty(name string, value interface{}) {
 	if s.properties[name] == nil {
 		s.AddProperty(name, value)
@@ -136,7 +151,17 @@
 	// The name will be "" for the top level property set.
 	//
 	// Returning (nil, ...) will cause the property set to be removed.
-	transformPropertySet(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag)
+	transformPropertySetBeforeContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag)
+
+	// Transform the property set, returning the new property set/tag to insert back into the
+	// parent property set (or module if this is the top level property set).
+	//
+	// This will be called after transforming the properties in the supplied set.
+	//
+	// The name will be "" for the top level property set.
+	//
+	// Returning (nil, ...) will cause the property set to be removed.
+	transformPropertySetAfterContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag)
 
 	// Transform a property, return the new value/tag to insert back into the property set.
 	//
@@ -165,7 +190,11 @@
 	return module
 }
 
-func (t identityTransformation) transformPropertySet(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
+func (t identityTransformation) transformPropertySetBeforeContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
+	return propertySet, tag
+}
+
+func (t identityTransformation) transformPropertySetAfterContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
 	return propertySet, tag
 }
 
@@ -180,12 +209,13 @@
 func (m *bpModule) transform(transformer bpTransformer) *bpModule {
 	transformedModule := transformer.transformModule(m)
 	// Copy the contents of the returned property set into the module and then transform that.
-	transformedModule.bpPropertySet, _ = transformer.transformPropertySet("", transformedModule.bpPropertySet, nil)
-	transformedModule.bpPropertySet.transform(transformer)
+	transformedModule.bpPropertySet, _ = transformPropertySet(transformer, "", transformedModule.bpPropertySet, nil)
 	return transformedModule
 }
 
-type deepCopyTransformation struct{}
+type deepCopyTransformation struct {
+	identityTransformation
+}
 
 func (t deepCopyTransformation) transformModule(module *bpModule) *bpModule {
 	// Take a shallow copy of the module. Any mutable property values will be copied by the
@@ -194,7 +224,7 @@
 	return &moduleCopy
 }
 
-func (t deepCopyTransformation) transformPropertySet(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
+func (t deepCopyTransformation) transformPropertySetBeforeContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
 	// Create a shallow copy of the properties map. Any mutable property values will be copied by the
 	// transformer.
 	propertiesCopy := make(map[string]interface{})
@@ -253,10 +283,19 @@
 }
 
 func (f *bpFile) newModule(moduleType string) *bpModule {
+	return newModule(moduleType)
+}
+
+func newModule(moduleType string) *bpModule {
 	module := &bpModule{
 		moduleType:    moduleType,
-		bpPropertySet: &bpPropertySet{},
+		bpPropertySet: newPropertySet(),
 	}
-	module.bpPropertySet.init()
 	return module
 }
+
+func newPropertySet() *bpPropertySet {
+	set := &bpPropertySet{}
+	set.init()
+	return set
+}
diff --git a/sdk/bp_test.go b/sdk/bp_test.go
new file mode 100644
index 0000000..f89f38c
--- /dev/null
+++ b/sdk/bp_test.go
@@ -0,0 +1,76 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// 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 sdk
+
+import (
+	"testing"
+
+	"android/soong/android"
+)
+
+type removeFredTransformation struct {
+	identityTransformation
+}
+
+func (t removeFredTransformation) transformProperty(name string, value interface{}, tag android.BpPropertyTag) (interface{}, android.BpPropertyTag) {
+	if name == "fred" {
+		return nil, nil
+	}
+	return value, tag
+}
+
+func (t removeFredTransformation) transformPropertySetBeforeContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
+	if name == "fred" {
+		return nil, nil
+	}
+	return propertySet, tag
+}
+
+func (t removeFredTransformation) transformPropertySetAfterContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
+	if len(propertySet.properties) == 0 {
+		return nil, nil
+	}
+	return propertySet, tag
+}
+
+func TestTransformRemoveProperty(t *testing.T) {
+
+	helper := &TestHelper{t}
+
+	set := newPropertySet()
+	set.AddProperty("name", "name")
+	set.AddProperty("fred", "12")
+
+	set.transformContents(removeFredTransformation{})
+
+	contents := &generatedContents{}
+	outputPropertySet(contents, set)
+	helper.AssertTrimmedStringEquals("removing property failed", "name: \"name\",\\n", contents.content.String())
+}
+
+func TestTransformRemovePropertySet(t *testing.T) {
+
+	helper := &TestHelper{t}
+
+	set := newPropertySet()
+	set.AddProperty("name", "name")
+	set.AddPropertySet("fred")
+
+	set.transformContents(removeFredTransformation{})
+
+	contents := &generatedContents{}
+	outputPropertySet(contents, set)
+	helper.AssertTrimmedStringEquals("removing property set failed", "name: \"name\",\\n", contents.content.String())
+}
diff --git a/sdk/cc_sdk_test.go b/sdk/cc_sdk_test.go
index 9c8e292..ecb1da0 100644
--- a/sdk/cc_sdk_test.go
+++ b/sdk/cc_sdk_test.go
@@ -749,3 +749,199 @@
 `),
 	)
 }
+
+func TestHostSnapshotWithMultiLib64(t *testing.T) {
+	// b/145598135 - Generating host snapshots for anything other than linux is not supported.
+	SkipIfNotLinux(t)
+
+	result := testSdkWithCc(t, `
+		module_exports {
+			name: "myexports",
+			device_supported: false,
+			host_supported: true,
+			target: {
+				host: {
+					compile_multilib: "64",
+				},
+			},
+			native_static_libs: ["mynativelib"],
+		}
+
+		cc_library_static {
+			name: "mynativelib",
+			device_supported: false,
+			host_supported: true,
+			srcs: [
+				"Test.cpp",
+				"aidl/foo/bar/Test.aidl",
+			],
+			export_include_dirs: ["include"],
+			aidl: {
+				export_aidl_headers: true,
+			},
+			system_shared_libs: [],
+			stl: "none",
+		}
+	`)
+
+	result.CheckSnapshot("myexports", "linux_glibc_common", "",
+		checkAndroidBpContents(`
+// This is auto-generated. DO NOT EDIT.
+
+cc_prebuilt_library_static {
+    name: "myexports_mynativelib@current",
+    sdk_member_name: "mynativelib",
+    device_supported: false,
+    host_supported: true,
+    export_include_dirs: ["include/include"],
+    arch: {
+        x86_64: {
+            srcs: ["x86_64/lib/mynativelib.a"],
+            export_include_dirs: ["x86_64/include_gen/mynativelib"],
+        },
+    },
+    stl: "none",
+    system_shared_libs: [],
+}
+
+cc_prebuilt_library_static {
+    name: "mynativelib",
+    prefer: false,
+    device_supported: false,
+    host_supported: true,
+    export_include_dirs: ["include/include"],
+    arch: {
+        x86_64: {
+            srcs: ["x86_64/lib/mynativelib.a"],
+            export_include_dirs: ["x86_64/include_gen/mynativelib"],
+        },
+    },
+    stl: "none",
+    system_shared_libs: [],
+}
+
+module_exports_snapshot {
+    name: "myexports@current",
+    device_supported: false,
+    host_supported: true,
+    target: {
+        host: {
+            compile_multilib: "64",
+        },
+    },
+    native_static_libs: ["myexports_mynativelib@current"],
+}`),
+		checkAllCopyRules(`
+include/Test.h -> include/include/Test.h
+.intermediates/mynativelib/linux_glibc_x86_64_static/mynativelib.a -> x86_64/lib/mynativelib.a
+.intermediates/mynativelib/linux_glibc_x86_64_static/gen/aidl/aidl/foo/bar/Test.h -> x86_64/include_gen/mynativelib/aidl/foo/bar/Test.h
+.intermediates/mynativelib/linux_glibc_x86_64_static/gen/aidl/aidl/foo/bar/BnTest.h -> x86_64/include_gen/mynativelib/aidl/foo/bar/BnTest.h
+.intermediates/mynativelib/linux_glibc_x86_64_static/gen/aidl/aidl/foo/bar/BpTest.h -> x86_64/include_gen/mynativelib/aidl/foo/bar/BpTest.h
+`),
+	)
+}
+
+func TestSnapshotWithCcHeadersLibrary(t *testing.T) {
+	result := testSdkWithCc(t, `
+		sdk {
+			name: "mysdk",
+			native_header_libs: ["mynativeheaders"],
+		}
+
+		cc_library_headers {
+			name: "mynativeheaders",
+			export_include_dirs: ["include"],
+			system_shared_libs: [],
+			stl: "none",
+		}
+	`)
+
+	result.CheckSnapshot("mysdk", "android_common", "",
+		checkAndroidBpContents(`
+// This is auto-generated. DO NOT EDIT.
+
+cc_prebuilt_library_headers {
+    name: "mysdk_mynativeheaders@current",
+    sdk_member_name: "mynativeheaders",
+    export_include_dirs: ["include/include"],
+    stl: "none",
+    system_shared_libs: [],
+}
+
+cc_prebuilt_library_headers {
+    name: "mynativeheaders",
+    prefer: false,
+    export_include_dirs: ["include/include"],
+    stl: "none",
+    system_shared_libs: [],
+}
+
+sdk_snapshot {
+    name: "mysdk@current",
+    native_header_libs: ["mysdk_mynativeheaders@current"],
+}
+`),
+		checkAllCopyRules(`
+include/Test.h -> include/include/Test.h
+`),
+	)
+}
+
+func TestHostSnapshotWithCcHeadersLibrary(t *testing.T) {
+	// b/145598135 - Generating host snapshots for anything other than linux is not supported.
+	SkipIfNotLinux(t)
+
+	result := testSdkWithCc(t, `
+		sdk {
+			name: "mysdk",
+			device_supported: false,
+			host_supported: true,
+			native_header_libs: ["mynativeheaders"],
+		}
+
+		cc_library_headers {
+			name: "mynativeheaders",
+			device_supported: false,
+			host_supported: true,
+			export_include_dirs: ["include"],
+			system_shared_libs: [],
+			stl: "none",
+		}
+	`)
+
+	result.CheckSnapshot("mysdk", "linux_glibc_common", "",
+		checkAndroidBpContents(`
+// This is auto-generated. DO NOT EDIT.
+
+cc_prebuilt_library_headers {
+    name: "mysdk_mynativeheaders@current",
+    sdk_member_name: "mynativeheaders",
+    device_supported: false,
+    host_supported: true,
+    export_include_dirs: ["include/include"],
+    stl: "none",
+    system_shared_libs: [],
+}
+
+cc_prebuilt_library_headers {
+    name: "mynativeheaders",
+    prefer: false,
+    device_supported: false,
+    host_supported: true,
+    export_include_dirs: ["include/include"],
+    stl: "none",
+    system_shared_libs: [],
+}
+
+sdk_snapshot {
+    name: "mysdk@current",
+    device_supported: false,
+    host_supported: true,
+    native_header_libs: ["mysdk_mynativeheaders@current"],
+}
+`),
+		checkAllCopyRules(`
+include/Test.h -> include/include/Test.h
+`),
+	)
+}
diff --git a/sdk/sdk.go b/sdk/sdk.go
index 4976dc0..c194ac1 100644
--- a/sdk/sdk.go
+++ b/sdk/sdk.go
@@ -323,8 +323,10 @@
 		if s.Enabled() {
 			for _, memberListProperty := range s.memberListProperties() {
 				names := memberListProperty.getter(s.dynamicMemberTypeListProperties)
-				tag := memberListProperty.dependencyTag
-				memberListProperty.memberType.AddDependencies(mctx, tag, names)
+				if len(names) > 0 {
+					tag := memberListProperty.dependencyTag
+					memberListProperty.memberType.AddDependencies(mctx, tag, names)
+				}
 			}
 		}
 	}
diff --git a/sdk/testing.go b/sdk/testing.go
index ae0620d..7352c74 100644
--- a/sdk/testing.go
+++ b/sdk/testing.go
@@ -61,6 +61,12 @@
 
 	config := android.TestArchConfig(buildDir, nil, bp, mockFS)
 
+	// Add windows as a default disable OS to test behavior when some OS variants
+	// are disabled.
+	config.Targets[android.Windows] = []android.Target{
+		{android.Windows, android.Arch{ArchType: android.X86_64}, android.NativeBridgeDisabled, "", ""},
+	}
+
 	ctx := android.NewTestArchContext()
 
 	// from android package
diff --git a/sdk/update.go b/sdk/update.go
index ff567be..d211e80 100644
--- a/sdk/update.go
+++ b/sdk/update.go
@@ -107,10 +107,15 @@
 // The members are first grouped by type and then grouped by name. The order of
 // the types is the order they are referenced in android.SdkMemberTypesRegistry.
 // The names are in the order in which the dependencies were added.
-func (s *sdk) collectMembers(ctx android.ModuleContext) []*sdkMember {
+//
+// Returns the members as well as the multilib setting to use.
+func (s *sdk) collectMembers(ctx android.ModuleContext) ([]*sdkMember, string) {
 	byType := make(map[android.SdkMemberType][]*sdkMember)
 	byName := make(map[string]*sdkMember)
 
+	lib32 := false // True if any of the members have 32 bit version.
+	lib64 := false // True if any of the members have 64 bit version.
+
 	ctx.WalkDeps(func(child android.Module, parent android.Module) bool {
 		tag := ctx.OtherModuleDependencyTag(child)
 		if memberTag, ok := tag.(android.SdkMemberTypeDependencyTag); ok {
@@ -122,7 +127,6 @@
 			}
 
 			name := ctx.OtherModuleName(child)
-
 			member := byName[name]
 			if member == nil {
 				member = &sdkMember{memberType: memberType, name: name}
@@ -130,6 +134,13 @@
 				byType[memberType] = append(byType[memberType], member)
 			}
 
+			multilib := child.Target().Arch.ArchType.Multilib
+			if multilib == "lib32" {
+				lib32 = true
+			} else if multilib == "lib64" {
+				lib64 = true
+			}
+
 			// Only append new variants to the list. This is needed because a member can be both
 			// exported by the sdk and also be a transitive sdk member.
 			member.variants = appendUniqueVariants(member.variants, child.(android.SdkAware))
@@ -148,7 +159,17 @@
 		members = append(members, membersOfType...)
 	}
 
-	return members
+	// Compute the setting of multilib.
+	var multilib string
+	if lib32 && lib64 {
+		multilib = "both"
+	} else if lib32 {
+		multilib = "32"
+	} else if lib64 {
+		multilib = "64"
+	}
+
+	return members, multilib
 }
 
 func appendUniqueVariants(variants []android.SdkAware, newVariant android.SdkAware) []android.SdkAware {
@@ -207,7 +228,8 @@
 	}
 	s.builderForTests = builder
 
-	for _, member := range s.collectMembers(ctx) {
+	members, multilib := s.collectMembers(ctx)
+	for _, member := range members {
 		member.memberType.BuildSnapshot(ctx, builder, member)
 	}
 
@@ -219,6 +241,9 @@
 	unversionedTransformer := unversionedTransformation{builder: builder}
 
 	for _, unversioned := range builder.prebuiltOrder {
+		// Prune any empty property sets.
+		unversioned = unversioned.transform(pruneEmptySetTransformer{})
+
 		// Copy the unversioned module so it can be modified to make it versioned.
 		versioned := unversioned.deepCopy()
 
@@ -249,6 +274,16 @@
 	}
 
 	addHostDeviceSupportedProperties(&s.ModuleBase, snapshotModule)
+
+	// Compile_multilib defaults to both and must always be set to both on the
+	// device and so only needs to be set when targeted at the host and is neither
+	// unspecified or both.
+	if s.HostSupported() && multilib != "" && multilib != "both" {
+		targetSet := snapshotModule.AddPropertySet("target")
+		hostSet := targetSet.AddPropertySet("host")
+		hostSet.AddProperty("compile_multilib", multilib)
+	}
+
 	for _, memberListProperty := range s.memberListProperties() {
 		names := memberListProperty.getter(s.dynamicMemberTypeListProperties)
 		if len(names) > 0 {
@@ -357,6 +392,20 @@
 	}
 }
 
+type pruneEmptySetTransformer struct {
+	identityTransformation
+}
+
+var _ bpTransformer = (*pruneEmptySetTransformer)(nil)
+
+func (t pruneEmptySetTransformer) transformPropertySetAfterContents(name string, propertySet *bpPropertySet, tag android.BpPropertyTag) (*bpPropertySet, android.BpPropertyTag) {
+	if len(propertySet.properties) == 0 {
+		return nil, nil
+	} else {
+		return propertySet, tag
+	}
+}
+
 func generateBpContents(contents *generatedContents, bpFile *bpFile) {
 	contents.Printfln("// This is auto-generated. DO NOT EDIT.")
 	for _, bpModule := range bpFile.order {
diff --git a/sysprop/sysprop_library.go b/sysprop/sysprop_library.go
index ce404f8..65dbb22 100644
--- a/sysprop/sysprop_library.go
+++ b/sysprop/sysprop_library.go
@@ -144,6 +144,9 @@
 	// list of .sysprop files which defines the properties.
 	Srcs []string `android:"path"`
 
+	// If set to true, build a variant of the module for the host.  Defaults to false.
+	Host_supported *bool
+
 	// Whether public stub exists or not.
 	Public_stub *bool `blueprint:"mutated"`
 }
@@ -306,12 +309,20 @@
 	Sysprop          struct {
 		Platform *bool
 	}
-	Header_libs        []string
-	Shared_libs        []string
+	Target struct {
+		Android struct {
+			Header_libs []string
+			Shared_libs []string
+		}
+		Host struct {
+			Static_libs []string
+		}
+	}
 	Required           []string
 	Recovery           *bool
 	Recovery_available *bool
 	Vendor_available   *bool
+	Host_supported     *bool
 }
 
 type javaLibraryProperties struct {
@@ -394,10 +405,12 @@
 	ccProps.Device_specific = proptools.BoolPtr(ctx.DeviceSpecific())
 	ccProps.Product_specific = proptools.BoolPtr(ctx.ProductSpecific())
 	ccProps.Sysprop.Platform = proptools.BoolPtr(isOwnerPlatform)
-	ccProps.Header_libs = []string{"libbase_headers"}
-	ccProps.Shared_libs = []string{"liblog"}
+	ccProps.Target.Android.Header_libs = []string{"libbase_headers"}
+	ccProps.Target.Android.Shared_libs = []string{"liblog"}
+	ccProps.Target.Host.Static_libs = []string{"libbase", "liblog"}
 	ccProps.Recovery_available = m.properties.Recovery_available
 	ccProps.Vendor_available = m.properties.Vendor_available
+	ccProps.Host_supported = m.properties.Host_supported
 	ctx.CreateModule(cc.LibraryFactory, &ccProps)
 
 	scope := "internal"
diff --git a/sysprop/sysprop_test.go b/sysprop/sysprop_test.go
index 7cad3da..51da222 100644
--- a/sysprop/sysprop_test.go
+++ b/sysprop/sysprop_test.go
@@ -161,6 +161,7 @@
 			api_packages: ["android.sysprop"],
 			property_owner: "Platform",
 			vendor_available: true,
+			host_supported: true,
 		}
 
 		sysprop_library {
@@ -244,6 +245,11 @@
 			static_libs: ["sysprop-platform", "sysprop-vendor"],
 		}
 
+		cc_library {
+			name: "libbase",
+			host_supported: true,
+		}
+
 		cc_library_headers {
 			name: "libbase_headers",
 			vendor_available: true,
@@ -256,6 +262,12 @@
 			nocrt: true,
 			system_shared_libs: [],
 			recovery_available: true,
+			host_supported: true,
+		}
+
+		cc_binary_host {
+			name: "hostbin",
+			static_libs: ["sysprop-platform"],
 		}
 
 		llndk_library {
diff --git a/vnames.go.json b/vnames.go.json
index 5842097..7ce2d4b 100644
--- a/vnames.go.json
+++ b/vnames.go.json
@@ -3,7 +3,7 @@
         "pattern": "(.*)",
         "vname": {
             "corpus": "android.googlesource.com/platform/superproject",
-            "path": "build/soong/@1@"
+            "path": "@1@"
         }
     }
 ]