Merge "Revert^2 "Add sdk mutator for native modules""
diff --git a/README.md b/README.md
index b1bb425..3eac87b 100644
--- a/README.md
+++ b/README.md
@@ -419,7 +419,8 @@
     name: "acme_cc_defaults",
     module_type: "cc_defaults",
     config_namespace: "acme",
-    variables: ["board", "feature"],
+    variables: ["board"],
+    bool_variables: ["feature"],
     properties: ["cflags", "srcs"],
 }
 
@@ -427,10 +428,6 @@
     name: "board",
     values: ["soc_a", "soc_b"],
 }
-
-soong_config_bool_variable {
-    name: "feature",
-}
 ```
 
 This example describes a new `acme_cc_defaults` module type that extends the
diff --git a/android/apex.go b/android/apex.go
index eabe059..9bf6fc7 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -19,6 +19,8 @@
 	"sort"
 	"strconv"
 	"sync"
+
+	"github.com/google/blueprint"
 )
 
 const (
@@ -32,6 +34,14 @@
 	MinSdkVersion int
 }
 
+// Extracted from ApexModule to make it easier to define custom subsets of the
+// ApexModule interface and improve code navigation within the IDE.
+type DepIsInSameApex interface {
+	// DepIsInSameApex tests if the other module 'dep' is installed to the same
+	// APEX as this module
+	DepIsInSameApex(ctx BaseModuleContext, dep Module) bool
+}
+
 // ApexModule is the interface that a module type is expected to implement if
 // the module has to be built differently depending on whether the module
 // is destined for an apex or not (installed to one of the regular partitions).
@@ -49,6 +59,8 @@
 // respectively.
 type ApexModule interface {
 	Module
+	DepIsInSameApex
+
 	apexModuleBase() *ApexModuleBase
 
 	// Marks that this module should be built for the specified APEXes.
@@ -88,16 +100,10 @@
 	// Tests if this module is available for the specified APEX or ":platform"
 	AvailableFor(what string) bool
 
-	// DepIsInSameApex tests if the other module 'dep' is installed to the same
-	// APEX as this module
-	DepIsInSameApex(ctx BaseModuleContext, dep Module) bool
-
-	// Returns the highest version which is <= min_sdk_version.
-	// For example, with min_sdk_version is 10 and versionList is [9,11]
-	// it returns 9.
-	ChooseSdkVersion(versionList []string, useLatest bool) (string, error)
-
-	ShouldSupportAndroid10() bool
+	// Returns the highest version which is <= maxSdkVersion.
+	// For example, with maxSdkVersion is 10 and versionList is [9,11]
+	// it returns 9 as string
+	ChooseSdkVersion(versionList []string, maxSdkVersion int) (string, error)
 }
 
 type ApexProperties struct {
@@ -113,6 +119,15 @@
 	Info ApexInfo `blueprint:"mutated"`
 }
 
+// Marker interface that identifies dependencies that are excluded from APEX
+// contents.
+type ExcludeFromApexContentsTag interface {
+	blueprint.DependencyTag
+
+	// Method that differentiates this interface from others.
+	ExcludeFromApexContents()
+}
+
 // Provides default implementation for the ApexModule interface. APEX-aware
 // modules are expected to include this struct and call InitApexModule().
 type ApexModuleBase struct {
@@ -193,22 +208,14 @@
 	return true
 }
 
-func (m *ApexModuleBase) ChooseSdkVersion(versionList []string, useLatest bool) (string, error) {
-	if useLatest {
-		return versionList[len(versionList)-1], nil
-	}
-	minSdkVersion := m.ApexProperties.Info.MinSdkVersion
+func (m *ApexModuleBase) ChooseSdkVersion(versionList []string, maxSdkVersion int) (string, error) {
 	for i := range versionList {
 		ver, _ := strconv.Atoi(versionList[len(versionList)-i-1])
-		if ver <= minSdkVersion {
+		if ver <= maxSdkVersion {
 			return versionList[len(versionList)-i-1], nil
 		}
 	}
-	return "", fmt.Errorf("min_sdk_version is set %v, but not found in %v", minSdkVersion, versionList)
-}
-
-func (m *ApexModuleBase) ShouldSupportAndroid10() bool {
-	return !m.IsForPlatform() && (m.ApexProperties.Info.MinSdkVersion <= SdkVersion_Android10)
+	return "", fmt.Errorf("not found a version(<=%d) in versionList: %v", maxSdkVersion, versionList)
 }
 
 func (m *ApexModuleBase) checkApexAvailableProperty(mctx BaseModuleContext) {
diff --git a/android/config.go b/android/config.go
index 7953170..558c828 100644
--- a/android/config.go
+++ b/android/config.go
@@ -1032,6 +1032,10 @@
 	return c.config.productVariables.DeviceKernelHeaders
 }
 
+func (c *deviceConfig) SamplingPGO() bool {
+	return Bool(c.config.productVariables.SamplingPGO)
+}
+
 func (c *config) NativeLineCoverage() bool {
 	return Bool(c.productVariables.NativeLineCoverage)
 }
diff --git a/android/defs.go b/android/defs.go
index 5c815e6..4552224 100644
--- a/android/defs.go
+++ b/android/defs.go
@@ -100,6 +100,9 @@
 	// Used only when USE_GOMA=true is set, to restrict non-goma jobs to the local parallelism value
 	localPool = blueprint.NewBuiltinPool("local_pool")
 
+	// Used only by RuleBuilder to identify remoteable rules. Does not actually get created in ninja.
+	remotePool = blueprint.NewBuiltinPool("remote_pool")
+
 	// Used for processes that need significant RAM to ensure there are not too many running in parallel.
 	highmemPool = blueprint.NewBuiltinPool("highmem_pool")
 )
diff --git a/android/module.go b/android/module.go
index 057a5c7..02b2c89 100644
--- a/android/module.go
+++ b/android/module.go
@@ -128,6 +128,13 @@
 	// and returns a top-down dependency path from a start module to current child module.
 	GetWalkPath() []Module
 
+	// GetTagPath is supposed to be called in visit function passed in WalkDeps()
+	// and returns a top-down dependency tags path from a start module to current child module.
+	// It has one less entry than GetWalkPath() as it contains the dependency tags that
+	// exist between each adjacent pair of modules in the GetWalkPath().
+	// GetTagPath()[i] is the tag between GetWalkPath()[i] and GetWalkPath()[i+1]
+	GetTagPath() []blueprint.DependencyTag
+
 	AddMissingDependencies(missingDeps []string)
 
 	Target() Target
@@ -220,6 +227,7 @@
 	InstallBypassMake() bool
 	InstallForceOS() *OsType
 	SkipInstall()
+	IsSkipInstall() bool
 	ExportedToMake() bool
 	InitRc() Paths
 	VintfFragments() Paths
@@ -894,6 +902,40 @@
 	return Bool(m.commonProperties.System_ext_specific)
 }
 
+func (m *ModuleBase) PartitionTag(config DeviceConfig) string {
+	partition := "system"
+	if m.SocSpecific() {
+		// A SoC-specific module could be on the vendor partition at
+		// "vendor" or the system partition at "system/vendor".
+		if config.VendorPath() == "vendor" {
+			partition = "vendor"
+		}
+	} else if m.DeviceSpecific() {
+		// A device-specific module could be on the odm partition at
+		// "odm", the vendor partition at "vendor/odm", or the system
+		// partition at "system/vendor/odm".
+		if config.OdmPath() == "odm" {
+			partition = "odm"
+		} else if strings.HasPrefix(config.OdmPath(), "vendor/") {
+			partition = "vendor"
+		}
+	} else if m.ProductSpecific() {
+		// A product-specific module could be on the product partition
+		// at "product" or the system partition at "system/product".
+		if config.ProductPath() == "product" {
+			partition = "product"
+		}
+	} else if m.SystemExtSpecific() {
+		// A system_ext-specific module could be on the system_ext
+		// partition at "system_ext" or the system partition at
+		// "system/system_ext".
+		if config.SystemExtPath() == "system_ext" {
+			partition = "system_ext"
+		}
+	}
+	return partition
+}
+
 func (m *ModuleBase) Enabled() bool {
 	if m.commonProperties.Enabled == nil {
 		return !m.Os().DefaultDisabled
@@ -909,6 +951,10 @@
 	m.commonProperties.SkipInstall = true
 }
 
+func (m *ModuleBase) IsSkipInstall() bool {
+	return m.commonProperties.SkipInstall == true
+}
+
 func (m *ModuleBase) ExportedToMake() bool {
 	return m.commonProperties.NamespaceExportedToMake
 }
@@ -1366,6 +1412,7 @@
 	debug         bool
 
 	walkPath []Module
+	tagPath  []blueprint.DependencyTag
 
 	strictVisitDeps bool // If true, enforce that all dependencies are enabled
 }
@@ -1472,10 +1519,17 @@
 func (m *moduleContext) Rule(pctx PackageContext, name string, params blueprint.RuleParams,
 	argNames ...string) blueprint.Rule {
 
-	if m.config.UseRemoteBuild() && params.Pool == nil {
-		// When USE_GOMA=true or USE_RBE=true are set and the rule is not supported by goma/RBE, restrict
-		// jobs to the local parallelism value
-		params.Pool = localPool
+	if m.config.UseRemoteBuild() {
+		if params.Pool == nil {
+			// When USE_GOMA=true or USE_RBE=true are set and the rule is not supported by goma/RBE, restrict
+			// jobs to the local parallelism value
+			params.Pool = localPool
+		} else if params.Pool == remotePool {
+			// remotePool is a fake pool used to identify rule that are supported for remoting. If the rule's
+			// pool is the remotePool, replace with nil so that ninja runs it at NINJA_REMOTE_NUM_JOBS
+			// parallelism.
+			params.Pool = nil
+		}
 	}
 
 	rule := m.bp.Rule(pctx.PackageContext, name, params, argNames...)
@@ -1655,6 +1709,7 @@
 
 func (b *baseModuleContext) WalkDeps(visit func(Module, Module) bool) {
 	b.walkPath = []Module{b.Module()}
+	b.tagPath = []blueprint.DependencyTag{}
 	b.bp.WalkDeps(func(child, parent blueprint.Module) bool {
 		childAndroidModule, _ := child.(Module)
 		parentAndroidModule, _ := parent.(Module)
@@ -1662,8 +1717,10 @@
 			// record walkPath before visit
 			for b.walkPath[len(b.walkPath)-1] != parentAndroidModule {
 				b.walkPath = b.walkPath[0 : len(b.walkPath)-1]
+				b.tagPath = b.tagPath[0 : len(b.tagPath)-1]
 			}
 			b.walkPath = append(b.walkPath, childAndroidModule)
+			b.tagPath = append(b.tagPath, b.OtherModuleDependencyTag(childAndroidModule))
 			return visit(childAndroidModule, parentAndroidModule)
 		} else {
 			return false
@@ -1675,6 +1732,10 @@
 	return b.walkPath
 }
 
+func (b *baseModuleContext) GetTagPath() []blueprint.DependencyTag {
+	return b.tagPath
+}
+
 func (m *moduleContext) VisitAllModuleVariants(visit func(Module)) {
 	m.bp.VisitAllModuleVariants(func(module blueprint.Module) {
 		visit(module.(Module))
diff --git a/android/prebuilt.go b/android/prebuilt.go
index c902ec8..82745a4 100644
--- a/android/prebuilt.go
+++ b/android/prebuilt.go
@@ -39,6 +39,12 @@
 // Mark this tag so dependencies that use it are excluded from visibility enforcement.
 func (t prebuiltDependencyTag) ExcludeFromVisibilityEnforcement() {}
 
+// Mark this tag so dependencies that use it are excluded from APEX contents.
+func (t prebuiltDependencyTag) ExcludeFromApexContents() {}
+
+var _ ExcludeFromVisibilityEnforcementTag = PrebuiltDepTag
+var _ ExcludeFromApexContentsTag = PrebuiltDepTag
+
 type PrebuiltProperties struct {
 	// When prefer is set to true the prebuilt will be used instead of any source module with
 	// a matching name.
diff --git a/android/rule_builder.go b/android/rule_builder.go
index 9005f07..6226548 100644
--- a/android/rule_builder.go
+++ b/android/rule_builder.go
@@ -446,7 +446,8 @@
 	if ctx.Config().UseGoma() && r.remoteable.Goma {
 		// When USE_GOMA=true is set and the rule is supported by goma, allow jobs to run outside the local pool.
 	} else if ctx.Config().UseRBE() && r.remoteable.RBE {
-		// When USE_RBE=true is set and the rule is supported by RBE, allow jobs to run outside the local pool.
+		// When USE_RBE=true is set and the rule is supported by RBE, use the remotePool.
+		pool = remotePool
 	} else if r.highmem {
 		pool = highmemPool
 	} else if ctx.Config().UseRemoteBuild() {
diff --git a/android/sdk.go b/android/sdk.go
index 66094cd..6f62f55 100644
--- a/android/sdk.go
+++ b/android/sdk.go
@@ -22,17 +22,30 @@
 	"github.com/google/blueprint/proptools"
 )
 
+// Extracted from SdkAware to make it easier to define custom subsets of the
+// SdkAware interface and improve code navigation within the IDE.
+//
+// In addition to its use in SdkAware this interface must also be implemented by
+// APEX to specify the SDKs required by that module and its contents. e.g. APEX
+// is expected to implement RequiredSdks() by reading its own properties like
+// `uses_sdks`.
+type RequiredSdks interface {
+	// The set of SDKs required by an APEX and its contents.
+	RequiredSdks() SdkRefs
+}
+
 // SdkAware is the interface that must be supported by any module to become a member of SDK or to be
 // built with SDK
 type SdkAware interface {
 	Module
+	RequiredSdks
+
 	sdkBase() *SdkBase
 	MakeMemberOf(sdk SdkRef)
 	IsInAnySdk() bool
 	ContainingSdk() SdkRef
 	MemberName() string
 	BuildWithSdks(sdks SdkRefs)
-	RequiredSdks() SdkRefs
 }
 
 // SdkRef refers to a version of an SDK
diff --git a/android/singleton.go b/android/singleton.go
index 45a9b82..568398c 100644
--- a/android/singleton.go
+++ b/android/singleton.go
@@ -128,10 +128,17 @@
 }
 
 func (s *singletonContextAdaptor) Rule(pctx PackageContext, name string, params blueprint.RuleParams, argNames ...string) blueprint.Rule {
-	if s.Config().UseRemoteBuild() && params.Pool == nil {
-		// When USE_GOMA=true or USE_RBE=true are set and the rule is not supported by goma/RBE, restrict
-		// jobs to the local parallelism value
-		params.Pool = localPool
+	if s.Config().UseRemoteBuild() {
+		if params.Pool == nil {
+			// When USE_GOMA=true or USE_RBE=true are set and the rule is not supported by goma/RBE, restrict
+			// jobs to the local parallelism value
+			params.Pool = localPool
+		} else if params.Pool == remotePool {
+			// remotePool is a fake pool used to identify rule that are supported for remoting. If the rule's
+			// pool is the remotePool, replace with nil so that ninja runs it at NINJA_REMOTE_NUM_JOBS
+			// parallelism.
+			params.Pool = nil
+		}
 	}
 	rule := s.SingletonContext.Rule(pctx.PackageContext, name, params, argNames...)
 	if s.Config().captureBuild {
diff --git a/android/soong_config_modules.go b/android/soong_config_modules.go
index 198108d..6ce609a 100644
--- a/android/soong_config_modules.go
+++ b/android/soong_config_modules.go
@@ -88,7 +88,8 @@
 //         name: "acme_cc_defaults",
 //         module_type: "cc_defaults",
 //         config_namespace: "acme",
-//         variables: ["board", "feature"],
+//         variables: ["board"],
+//         bool_variables: ["feature"],
 //         properties: ["cflags", "srcs"],
 //     }
 //
@@ -97,10 +98,6 @@
 //         values: ["soc_a", "soc_b"],
 //     }
 //
-//     soong_config_bool_variable {
-//         name: "feature",
-//     }
-//
 // If an acme BoardConfig.mk file contained:
 //
 //     SOONG_CONFIG_NAMESPACES += acme
@@ -125,7 +122,10 @@
 }
 
 func (m *soongConfigModuleTypeImport) Name() string {
-	return "soong_config_module_type_import_" + soongconfig.CanonicalizeToProperty(m.properties.From)
+	// The generated name is non-deterministic, but it does not
+	// matter because this module does not emit any rules.
+	return soongconfig.CanonicalizeToProperty(m.properties.From) +
+		"soong_config_module_type_import_" + fmt.Sprintf("%p", m)
 }
 
 func (*soongConfigModuleTypeImport) Nameless()                                 {}
@@ -149,7 +149,8 @@
 //         name: "acme_cc_defaults",
 //         module_type: "cc_defaults",
 //         config_namespace: "acme",
-//         variables: ["board", "feature"],
+//         variables: ["board"],
+//         bool_variables: ["feature"],
 //         properties: ["cflags", "srcs"],
 //     }
 //
@@ -158,10 +159,6 @@
 //         values: ["soc_a", "soc_b"],
 //     }
 //
-//     soong_config_bool_variable {
-//         name: "feature",
-//     }
-//
 //     acme_cc_defaults {
 //         name: "acme_defaults",
 //         cflags: ["-DGENERIC"],
diff --git a/android/soong_config_modules_test.go b/android/soong_config_modules_test.go
index 6ad88a2..1cf060d 100644
--- a/android/soong_config_modules_test.go
+++ b/android/soong_config_modules_test.go
@@ -43,7 +43,8 @@
 			name: "acme_test_defaults",
 			module_type: "test_defaults",
 			config_namespace: "acme",
-			variables: ["board", "feature1", "feature2", "FEATURE3"],
+			variables: ["board", "feature1", "FEATURE3"],
+			bool_variables: ["feature2"],
 			properties: ["cflags", "srcs"],
 		}
 
@@ -57,10 +58,6 @@
 		}
 
 		soong_config_bool_variable {
-			name: "feature2",
-		}
-
-		soong_config_bool_variable {
 			name: "FEATURE3",
 		}
 	`
diff --git a/android/soongconfig/modules.go b/android/soongconfig/modules.go
index aa4f5c5..2d6063d 100644
--- a/android/soongconfig/modules.go
+++ b/android/soongconfig/modules.go
@@ -109,6 +109,9 @@
 	// the list of SOONG_CONFIG variables that this module type will read
 	Variables []string
 
+	// the list of boolean SOONG_CONFIG variables that this module type will read
+	Bool_variables []string
+
 	// the list of properties that this module type will extend.
 	Properties []string
 }
@@ -146,6 +149,18 @@
 	}
 	v.ModuleTypes[props.Name] = mt
 
+	for _, name := range props.Bool_variables {
+		if name == "" {
+			return []error{fmt.Errorf("bool_variable name must not be blank")}
+		}
+
+		mt.Variables = append(mt.Variables, &boolVariable{
+			baseVariable: baseVariable{
+				variable: name,
+			},
+		})
+	}
+
 	return nil
 }
 
diff --git a/android/variable.go b/android/variable.go
index 91de956..612d138 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -95,6 +95,9 @@
 			Sanitize struct {
 				Address *bool
 			}
+			Optimize struct {
+				Enabled *bool
+			}
 		}
 
 		Pdk struct {
@@ -252,6 +255,8 @@
 	ClangTidy  *bool   `json:",omitempty"`
 	TidyChecks *string `json:",omitempty"`
 
+	SamplingPGO  *bool   `json:",omitempty"`
+
 	NativeLineCoverage   *bool    `json:",omitempty"`
 	Native_coverage      *bool    `json:",omitempty"`
 	ClangCoverage        *bool    `json:",omitempty"`
diff --git a/android/vts_config.go b/android/vts_config.go
index 9a1df7c..77fb9fe 100644
--- a/android/vts_config.go
+++ b/android/vts_config.go
@@ -53,7 +53,7 @@
 				fmt.Fprintf(w, "LOCAL_TEST_CONFIG := %s\n",
 					*me.properties.Test_config)
 			}
-			fmt.Fprintf(w, "LOCAL_COMPATIBILITY_SUITE := vts %s\n",
+			fmt.Fprintf(w, "LOCAL_COMPATIBILITY_SUITE := vts10 %s\n",
 				strings.Join(me.properties.Test_suites, " "))
 		},
 	}
@@ -64,7 +64,7 @@
 	me.AddProperties(&me.properties)
 }
 
-// vts_config generates a Vendor Test Suite (VTS) configuration file from the
+// vts_config generates a Vendor Test Suite (VTS10) configuration file from the
 // <test_config> xml file and stores it in a subdirectory of $(HOST_OUT).
 func VtsConfigFactory() Module {
 	module := &VtsConfig{}
diff --git a/apex/androidmk.go b/apex/androidmk.go
index 5c15e8e..db1048e 100644
--- a/apex/androidmk.go
+++ b/apex/androidmk.go
@@ -22,6 +22,7 @@
 
 	"android/soong/android"
 	"android/soong/cc"
+	"android/soong/java"
 
 	"github.com/google/blueprint/proptools"
 )
@@ -181,6 +182,9 @@
 			// we need to remove the suffix from LOCAL_MODULE_STEM, otherwise
 			// we will have foo.apk.apk
 			fmt.Fprintln(w, "LOCAL_MODULE_STEM :=", strings.TrimSuffix(fi.builtFile.Base(), ".apk"))
+			if app, ok := fi.module.(*java.AndroidApp); ok && len(app.JniCoverageOutputs()) > 0 {
+				fmt.Fprintln(w, "LOCAL_PREBUILT_COVERAGE_ARCHIVE :=", strings.Join(app.JniCoverageOutputs().Strings(), " "))
+			}
 			fmt.Fprintln(w, "include $(BUILD_SYSTEM)/soong_app_prebuilt.mk")
 		} else if fi.class == nativeSharedLib || fi.class == nativeExecutable || fi.class == nativeTest {
 			fmt.Fprintln(w, "LOCAL_MODULE_STEM :=", fi.builtFile.Base())
diff --git a/apex/apex.go b/apex/apex.go
index 46aaa8b..5a56185 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -18,6 +18,7 @@
 	"fmt"
 	"path"
 	"path/filepath"
+	"regexp"
 	"sort"
 	"strconv"
 	"strings"
@@ -94,27 +95,9 @@
 	// Module separator
 	//
 	m["com.android.adbd"] = []string{
-		"adbd",
-		"bcm_object",
-		"fmtlib",
-		"libadbconnection_server",
-		"libadbd",
 		"libadbd_auth",
-		"libadbd_core",
-		"libadbd_services",
-		"libasyncio",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
 		"libbuildversion",
-		"libc++",
 		"libcap",
-		"libcrypto",
-		"libcrypto_utils",
-		"libcutils",
-		"libcutils_headers",
-		"libdiagnose_usb",
-		"liblog_headers",
 		"libmdnssd",
 		"libminijail",
 		"libminijail_gen_constants",
@@ -125,9 +108,6 @@
 		"libpackagelistparser",
 		"libpcre2",
 		"libprocessgroup_headers",
-		"libqemu_pipe",
-		"libsystem_headers",
-		"libutils_headers",
 	}
 	//
 	// Module separator
@@ -136,7 +116,6 @@
 		"art_cmdlineparser_headers",
 		"art_disassembler_headers",
 		"art_libartbase_headers",
-		"bcm_object",
 		"bionic_libc_platform_headers",
 		"core-repackaged-icu4j",
 		"cpp-define-generator-asm-support",
@@ -148,9 +127,7 @@
 		"conscrypt.module.intra.core.api.stubs",
 		"dex2oat_headers",
 		"dt_fd_forward_export",
-		"fmtlib",
 		"icu4c_extra_headers",
-		"jacocoagent",
 		"javavm_headers",
 		"jni_platform_headers",
 		"libPlatformProperties",
@@ -160,15 +137,6 @@
 		"libart_runtime_headers_ndk",
 		"libartd-disassembler",
 		"libasync_safe",
-		"libbacktrace",
-		"libbase",
-		"libbase_headers",
-		"libc++",
-		"libc++_static",
-		"libc++abi",
-		"libc++demangle",
-		"libc_headers",
-		"libcrypto",
 		"libdexfile_all_headers",
 		"libdexfile_external_headers",
 		"libdexfile_support",
@@ -181,7 +149,6 @@
 		"libicuuc_headers",
 		"libicuuc_stubdata",
 		"libjdwp_headers",
-		"liblog_headers",
 		"liblz4",
 		"liblzma",
 		"libmeminfo",
@@ -192,7 +159,6 @@
 		"libopenjdkjvmti_headers",
 		"libperfetto_client_experimental",
 		"libprocinfo",
-		"libprotobuf-cpp-lite",
 		"libunwind_llvm",
 		"libunwindstack",
 		"libv8",
@@ -229,13 +195,10 @@
 		"android.hidl.token@1.0-utils",
 		"avrcp-target-service",
 		"avrcp_headers",
-		"bcm_object",
 		"bluetooth-protos-lite",
 		"bluetooth.mapsapi",
 		"com.android.vcard",
 		"dnsresolver_aidl_interface-V2-java",
-		"fmtlib",
-		"guava",
 		"ipmemorystore-aidl-interfaces-V5-java",
 		"ipmemorystore-aidl-interfaces-java",
 		"internal_include_headers",
@@ -245,9 +208,6 @@
 		"libFraunhoferAAC",
 		"libaudio-a2dp-hw-utils",
 		"libaudio-hearing-aid-hw-utils",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
 		"libbinder_headers",
 		"libbluetooth",
 		"libbluetooth-types",
@@ -269,38 +229,23 @@
 		"libbtdevice",
 		"libbte",
 		"libbtif",
-		"libc++",
 		"libchrome",
-		"libcrypto",
-		"libcutils",
-		"libcutils_headers",
 		"libevent",
 		"libfmq",
 		"libg722codec",
 		"libgtest_prod",
 		"libgui_headers",
-		"libhidlbase",
-		"libhidlbase-impl-internal",
-		"libhidltransport-impl-internal",
-		"libhwbinder-impl-internal",
-		"libjsoncpp",
-		"liblog_headers",
 		"libmedia_headers",
 		"libmodpb64",
 		"libosi",
 		"libprocessgroup",
 		"libprocessgroup_headers",
-		"libprotobuf-cpp-lite",
-		"libprotobuf-java-lite",
-		"libprotobuf-java-micro",
 		"libstagefright_foundation_headers",
 		"libstagefright_headers",
 		"libstatslog",
 		"libstatssocket",
-		"libsystem_headers",
 		"libtinyxml2",
 		"libudrv-uipc",
-		"libutils_headers",
 		"libz",
 		"media_plugin_headers",
 		"net-utils-services-common",
@@ -320,12 +265,8 @@
 	// Module separator
 	//
 	m["com.android.conscrypt"] = []string{
-		"bcm_object",
 		"boringssl_self_test",
-		"libc++",
-		"libcrypto",
 		"libnativehelper_header_only",
-		"libssl",
 		"unsupportedappusage",
 	}
 	//
@@ -365,28 +306,11 @@
 		"android.hidl.memory.token@1.0",
 		"android.hidl.memory@1.0",
 		"android.hidl.safe_union@1.0",
-		"bcm_object",
-		"fmtlib",
 		"gemmlowp_headers",
 		"libarect",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
 		"libbuildversion",
-		"libc++",
-		"libcrypto",
-		"libcrypto_static",
-		"libcutils",
-		"libcutils_headers",
 		"libeigen",
 		"libfmq",
-		"libhidlbase",
-		"libhidlbase-impl-internal",
-		"libhidlmemory",
-		"libhidltransport-impl-internal",
-		"libhwbinder-impl-internal",
-		"libjsoncpp",
-		"liblog_headers",
 		"libmath",
 		"libneuralnetworks_common",
 		"libneuralnetworks_headers",
@@ -394,12 +318,10 @@
 		"libprocessgroup_headers",
 		"libprocpartition",
 		"libsync",
-		"libsystem_headers",
 		"libtextclassifier_hash",
 		"libtextclassifier_hash_headers",
 		"libtextclassifier_hash_static",
 		"libtflite_kernel_utils",
-		"libutils_headers",
 		"philox_random",
 		"philox_random_headers",
 		"tensorflow_headers",
@@ -431,9 +353,7 @@
 		"android.hidl.memory@1.0",
 		"android.hidl.token@1.0",
 		"android.hidl.token@1.0-utils",
-		"bcm_object",
 		"bionic_libc_platform_headers",
-		"fmtlib",
 		"gl_headers",
 		"libEGL",
 		"libEGL_blobCache",
@@ -455,23 +375,14 @@
 		"libaudiopolicy",
 		"libaudioutils",
 		"libaudioutils_fixedfft",
-		"libbacktrace",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
 		"libbinder_headers",
 		"libbluetooth-types-header",
 		"libbufferhub",
 		"libbufferhub_headers",
 		"libbufferhubqueue",
-		"libc++",
-		"libc_headers",
 		"libc_malloc_debug_backtrace",
 		"libcamera_client",
 		"libcamera_metadata",
-		"libcrypto",
-		"libcutils",
-		"libcutils_headers",
 		"libdexfile_external_headers",
 		"libdexfile_support",
 		"libdvr_headers",
@@ -483,14 +394,7 @@
 		"libgui",
 		"libgui_headers",
 		"libhardware_headers",
-		"libhidlbase",
-		"libhidlbase-impl-internal",
-		"libhidlmemory",
-		"libhidltransport-impl-internal",
-		"libhwbinder-impl-internal",
 		"libinput",
-		"libjsoncpp",
-		"liblog_headers",
 		"liblzma",
 		"libmath",
 		"libmedia",
@@ -538,11 +442,9 @@
 		"libstagefright_mpeg2extractor",
 		"libstagefright_mpeg2support",
 		"libsync",
-		"libsystem_headers",
 		"libui",
 		"libui_headers",
 		"libunwindstack",
-		"libutils_headers",
 		"libvibrator",
 		"libvorbisidec",
 		"libwavextractor",
@@ -582,7 +484,6 @@
 		"android.hidl.safe_union@1.0",
 		"android.hidl.token@1.0",
 		"android.hidl.token@1.0-utils",
-		"fmtlib",
 		"libEGL",
 		"libFLAC",
 		"libFLAC-config",
@@ -599,15 +500,10 @@
 		"libavcenc",
 		"libavservices_minijail",
 		"libavservices_minijail",
-		"libbacktrace",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
 		"libbinder_headers",
 		"libbinderthreadstateutils",
 		"libbluetooth-types-header",
 		"libbufferhub_headers",
-		"libc++",
 		"libc_scudo",
 		"libcap",
 		"libcodec2",
@@ -647,8 +543,6 @@
 		"libcodec2_soft_vp9dec",
 		"libcodec2_soft_vp9enc",
 		"libcodec2_vndk",
-		"libcutils",
-		"libcutils_headers",
 		"libdexfile_support",
 		"libdvr_headers",
 		"libfmq",
@@ -664,15 +558,8 @@
 		"libhardware_headers",
 		"libhevcdec",
 		"libhevcenc",
-		"libhidlbase",
-		"libhidlbase-impl-internal",
-		"libhidlmemory",
-		"libhidltransport-impl-internal",
-		"libhwbinder-impl-internal",
 		"libion",
 		"libjpeg",
-		"libjsoncpp",
-		"liblog_headers",
 		"liblzma",
 		"libmath",
 		"libmedia_codecserviceregistrant",
@@ -710,11 +597,9 @@
 		"libstagefright_m4vh263enc",
 		"libstagefright_mp3dec",
 		"libsync",
-		"libsystem_headers",
 		"libui",
 		"libui_headers",
 		"libunwindstack",
-		"libutils_headers",
 		"libvorbisidec",
 		"libvpx",
 		"libyuv",
@@ -730,7 +615,6 @@
 		"MediaProvider",
 		"MediaProviderGoogle",
 		"fmtlib_ndk",
-		"guava",
 		"libbase_ndk",
 		"libfuse",
 		"libfuse_jni",
@@ -754,7 +638,6 @@
 		"kotlinx-coroutines-android-nodeps",
 		"kotlinx-coroutines-core",
 		"kotlinx-coroutines-core-nodeps",
-		"libprotobuf-java-lite",
 		"permissioncontroller-statsd",
 	}
 	//
@@ -762,14 +645,9 @@
 	//
 	m["com.android.runtime"] = []string{
 		"bionic_libc_platform_headers",
-		"fmtlib",
 		"libarm-optimized-routines-math",
 		"libasync_safe",
 		"libasync_safe_headers",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
-		"libc++",
 		"libc_aeabi",
 		"libc_bionic",
 		"libc_bionic_ndk",
@@ -783,7 +661,6 @@
 		"libc_freebsd",
 		"libc_freebsd_large_stack",
 		"libc_gdtoa",
-		"libc_headers",
 		"libc_init_dynamic",
 		"libc_init_static",
 		"libc_jemalloc_wrapper",
@@ -798,8 +675,6 @@
 		"libc_syscalls",
 		"libc_tzcode",
 		"libc_unwind_static",
-		"libcutils",
-		"libcutils_headers",
 		"libdebuggerd",
 		"libdebuggerd_common_headers",
 		"libdebuggerd_handler_core",
@@ -812,7 +687,6 @@
 		"libjemalloc5",
 		"liblinker_main",
 		"liblinker_malloc",
-		"liblog_headers",
 		"liblz4",
 		"liblzma",
 		"libprocessgroup_headers",
@@ -820,11 +694,9 @@
 		"libpropertyinfoparser",
 		"libscudo",
 		"libstdc++",
-		"libsystem_headers",
 		"libsystemproperties",
 		"libtombstoned_client_static",
 		"libunwindstack",
-		"libutils_headers",
 		"libz",
 		"libziparchive",
 	}
@@ -832,34 +704,19 @@
 	// Module separator
 	//
 	m["com.android.resolv"] = []string{
-		"bcm_object",
 		"dnsresolver_aidl_interface-unstable-ndk_platform",
-		"fmtlib",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
-		"libc++",
-		"libcrypto",
-		"libcutils",
-		"libcutils_headers",
 		"libgtest_prod",
-		"libjsoncpp",
-		"liblog_headers",
 		"libnativehelper_header_only",
 		"libnetd_client_headers",
 		"libnetd_resolv",
 		"libnetdutils",
 		"libprocessgroup",
 		"libprocessgroup_headers",
-		"libprotobuf-cpp-lite",
-		"libssl",
 		"libstatslog_resolv",
 		"libstatspush_compat",
 		"libstatssocket",
 		"libstatssocket_headers",
-		"libsystem_headers",
 		"libsysutils",
-		"libutils_headers",
 		"netd_event_listener_interface-ndk_platform",
 		"server_configurable_flags",
 		"stats_proto",
@@ -868,28 +725,13 @@
 	// Module separator
 	//
 	m["com.android.tethering"] = []string{
-		"libbase",
-		"libc++",
 		"libnativehelper_compat_libc++",
 		"android.hardware.tetheroffload.config@1.0",
-		"fmtlib",
-		"libbacktrace_headers",
-		"libbase_headers",
 		"libcgrouprc",
 		"libcgrouprc_format",
-		"libcutils",
-		"libcutils_headers",
-		"libhidlbase",
-		"libhidlbase-impl-internal",
-		"libhidltransport-impl-internal",
-		"libhwbinder-impl-internal",
-		"libjsoncpp",
-		"liblog_headers",
 		"libprocessgroup",
 		"libprocessgroup_headers",
-		"libsystem_headers",
 		"libtetherutilsjni",
-		"libutils_headers",
 		"libvndksupport",
 		"tethering-aidl-interfaces-java",
 	}
@@ -925,20 +767,9 @@
 		"ipmemorystore-aidl-interfaces-V3-java",
 		"ipmemorystore-aidl-interfaces-java",
 		"ksoap2",
-		"libbacktrace_headers",
-		"libbase",
-		"libbase_headers",
-		"libc++",
-		"libcutils",
-		"libcutils_headers",
-		"liblog_headers",
 		"libnanohttpd",
 		"libprocessgroup",
 		"libprocessgroup_headers",
-		"libprotobuf-java-lite",
-		"libprotobuf-java-nano",
-		"libsystem_headers",
-		"libutils_headers",
 		"libwifi-jni",
 		"net-utils-services-common",
 		"netd_aidl_interface-V2-java",
@@ -966,34 +797,14 @@
 	// Module separator
 	//
 	m["com.android.os.statsd"] = []string{
-		"libbacktrace_headers",
-		"libbase_headers",
-		"libc++",
-		"libcutils",
-		"libcutils_headers",
-		"liblog_headers",
 		"libprocessgroup_headers",
 		"libstatssocket",
-		"libsystem_headers",
-		"libutils_headers",
 	}
 	//
 	// Module separator
 	//
 	m[android.AvailableToAnyApex] = []string{
-		"crtbegin_dynamic",
-		"crtbegin_dynamic1",
-		"crtbegin_so",
-		"crtbegin_so1",
-		"crtbegin_static",
-		"crtbrand",
-		"crtend_android",
-		"crtend_so",
 		"libatomic",
-		"libc++_static",
-		"libc++abi",
-		"libc++demangle",
-		"libc_headers",
 		"libclang_rt",
 		"libgcc_stripped",
 		"libprofile-clang-extras",
@@ -1001,22 +812,6 @@
 		"libprofile-extras",
 		"libprofile-extras_ndk",
 		"libunwind_llvm",
-		"ndk_crtbegin_dynamic.27",
-		"ndk_crtbegin_so.16",
-		"ndk_crtbegin_so.19",
-		"ndk_crtbegin_so.21",
-		"ndk_crtbegin_so.24",
-		"ndk_crtbegin_so.27",
-		"ndk_crtend_android.27",
-		"ndk_crtend_so.16",
-		"ndk_crtend_so.19",
-		"ndk_crtend_so.21",
-		"ndk_crtend_so.24",
-		"ndk_crtend_so.27",
-		"ndk_libandroid_support",
-		"ndk_libc++_static",
-		"ndk_libc++abi",
-		"ndk_libunwind",
 	}
 	return m
 }
@@ -1071,20 +866,28 @@
 		return
 	}
 
-	cur := mctx.Module().(interface {
-		DepIsInSameApex(android.BaseModuleContext, android.Module) bool
-	})
+	cur := mctx.Module().(android.DepIsInSameApex)
 
 	mctx.VisitDirectDeps(func(child android.Module) {
 		depName := mctx.OtherModuleName(child)
 		if am, ok := child.(android.ApexModule); ok && am.CanHaveApexVariants() &&
-			cur.DepIsInSameApex(mctx, child) {
+			(cur.DepIsInSameApex(mctx, child) || inAnySdk(child)) {
 			android.UpdateApexDependency(apexBundles, depName, directDep)
 			am.BuildForApexes(apexBundles)
 		}
 	})
 }
 
+// If a module in an APEX depends on a module from an SDK then it needs an APEX
+// specific variant created for it. Refer to sdk.sdkDepsReplaceMutator.
+func inAnySdk(module android.Module) bool {
+	if sa, ok := module.(android.SdkAware); ok {
+		return sa.IsInAnySdk()
+	}
+
+	return false
+}
+
 // Create apex variations if a module is included in APEX(s).
 func apexMutator(mctx android.BottomUpMutatorContext) {
 	if am, ok := mctx.Module().(android.ApexModule); ok && am.CanHaveApexVariants() {
@@ -1973,10 +1776,14 @@
 	return true
 }
 
+// Function called while walking an APEX's payload dependencies.
+//
+// Return true if the `to` module should be visited, false otherwise.
+type payloadDepsCallback func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) bool
+
 // Visit dependencies that contributes to the payload of this APEX
-func (a *apexBundle) walkPayloadDeps(ctx android.ModuleContext,
-	do func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool)) {
-	ctx.WalkDepsBlueprint(func(child, parent blueprint.Module) bool {
+func (a *apexBundle) walkPayloadDeps(ctx android.ModuleContext, do payloadDepsCallback) {
+	ctx.WalkDeps(func(child, parent android.Module) bool {
 		am, ok := child.(android.ApexModule)
 		if !ok || !am.CanHaveApexVariants() {
 			return false
@@ -1985,22 +1792,18 @@
 		// Check for the direct dependencies that contribute to the payload
 		if dt, ok := ctx.OtherModuleDependencyTag(child).(dependencyTag); ok {
 			if dt.payload {
-				do(ctx, parent, am, false /* externalDep */)
-				return true
+				return do(ctx, parent, am, false /* externalDep */)
 			}
+			// As soon as the dependency graph crosses the APEX boundary, don't go further.
 			return false
 		}
 
 		// Check for the indirect dependencies if it is considered as part of the APEX
 		if am.ApexName() != "" {
-			do(ctx, parent, am, false /* externalDep */)
-			return true
+			return do(ctx, parent, am, false /* externalDep */)
 		}
 
-		do(ctx, parent, am, true /* externalDep */)
-
-		// As soon as the dependency graph crosses the APEX boundary, don't go further.
-		return false
+		return do(ctx, parent, am, true /* externalDep */)
 	})
 }
 
@@ -2016,6 +1819,24 @@
 	return android.FutureApiLevel
 }
 
+// A regexp for removing boilerplate from BaseDependencyTag from the string representation of
+// a dependency tag.
+var tagCleaner = regexp.MustCompile(`\QBaseDependencyTag:blueprint.BaseDependencyTag{}\E(, )?`)
+
+func PrettyPrintTag(tag blueprint.DependencyTag) string {
+	// Use tag's custom String() method if available.
+	if stringer, ok := tag.(fmt.Stringer); ok {
+		return stringer.String()
+	}
+
+	// Otherwise, get a default string representation of the tag's struct.
+	tagString := fmt.Sprintf("%#v", tag)
+
+	// Remove the boilerplate from BaseDependencyTag as it adds no value.
+	tagString = tagCleaner.ReplaceAllString(tagString, "")
+	return tagString
+}
+
 // Ensures that the dependencies are marked as available for this APEX
 func (a *apexBundle) checkApexAvailability(ctx android.ModuleContext) {
 	// Let's be practical. Availability for test, host, and the VNDK apex isn't important
@@ -2023,24 +1844,54 @@
 		return
 	}
 
-	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) {
+	// Coverage build adds additional dependencies for the coverage-only runtime libraries.
+	// Requiring them and their transitive depencies with apex_available is not right
+	// because they just add noise.
+	if ctx.Config().IsEnvTrue("EMMA_INSTRUMENT") || a.IsNativeCoverageNeeded(ctx) {
+		return
+	}
+
+	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) bool {
+		if externalDep {
+			// As soon as the dependency graph crosses the APEX boundary, don't go further.
+			return false
+		}
+
 		apexName := ctx.ModuleName()
 		fromName := ctx.OtherModuleName(from)
 		toName := ctx.OtherModuleName(to)
-		if externalDep || to.AvailableFor(apexName) || whitelistedApexAvailable(apexName, toName) {
-			return
+
+		// If `to` is not actually in the same APEX as `from` then it does not need apex_available and neither
+		// do any of its dependencies.
+		if am, ok := from.(android.DepIsInSameApex); ok && !am.DepIsInSameApex(ctx, to) {
+			// As soon as the dependency graph crosses the APEX boundary, don't go further.
+			return false
 		}
-		ctx.ModuleErrorf("%q requires %q that is not available for the APEX.", fromName, toName)
+
+		if to.AvailableFor(apexName) || whitelistedApexAvailable(apexName, toName) {
+			return true
+		}
+		message := ""
+		tagPath := ctx.GetTagPath()
+		// Skip the first module as that will be added at the start of the error message by ctx.ModuleErrorf().
+		walkPath := ctx.GetWalkPath()[1:]
+		for i, m := range walkPath {
+			message = fmt.Sprintf("%s\n           via tag %s\n    -> %s", message, PrettyPrintTag(tagPath[i]), m.String())
+		}
+		ctx.ModuleErrorf("%q requires %q that is not available for the APEX. Dependency path:%s", fromName, toName, message)
+		// Visit this module's dependencies to check and report any issues with their availability.
+		return true
 	})
 }
 
 // Collects the list of module names that directly or indirectly contributes to the payload of this APEX
 func (a *apexBundle) collectDepsInfo(ctx android.ModuleContext) {
 	a.depInfos = make(map[string]depInfo)
-	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) {
+	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) bool {
 		if from.Name() == to.Name() {
 			// This can happen for cc.reuseObjTag. We are not interested in tracking this.
-			return
+			// As soon as the dependency graph crosses the APEX boundary, don't go further.
+			return !externalDep
 		}
 
 		if info, exists := a.depInfos[to.Name()]; exists {
@@ -2056,6 +1907,9 @@
 				isExternal: externalDep,
 			}
 		}
+
+		// As soon as the dependency graph crosses the APEX boundary, don't go further.
+		return !externalDep
 	})
 }
 
@@ -2132,6 +1986,9 @@
 	// TODO(jiyong) do this using walkPayloadDeps
 	ctx.WalkDepsBlueprint(func(child, parent blueprint.Module) bool {
 		depTag := ctx.OtherModuleDependencyTag(child)
+		if _, ok := depTag.(android.ExcludeFromApexContentsTag); ok {
+			return false
+		}
 		depName := ctx.OtherModuleName(child)
 		if _, isDirectDep := parent.(*apexBundle); isDirectDep {
 			switch depTag {
@@ -2300,7 +2157,7 @@
 						filesInfo = append(filesInfo, apexFileForPrebuiltEtc(ctx, prebuilt, depName))
 					}
 				} else if am.CanHaveApexVariants() && am.IsInstallableToApex() {
-					ctx.ModuleErrorf("unexpected tag %q for indirect dependency %q", depTag, depName)
+					ctx.ModuleErrorf("unexpected tag %s for indirect dependency %q", PrettyPrintTag(depTag), depName)
 				}
 			}
 		}
diff --git a/apex/apex_test.go b/apex/apex_test.go
index dbccb92..0c8937e 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -27,6 +27,7 @@
 
 	"android/soong/android"
 	"android/soong/cc"
+	"android/soong/dexpreopt"
 	"android/soong/java"
 )
 
@@ -158,6 +159,7 @@
 		"my_include":                                 nil,
 		"foo/bar/MyClass.java":                       nil,
 		"prebuilt.jar":                               nil,
+		"prebuilt.so":                                nil,
 		"vendor/foo/devkeys/test.x509.pem":           nil,
 		"vendor/foo/devkeys/test.pk8":                nil,
 		"testkey.x509.pem":                           nil,
@@ -367,7 +369,7 @@
 			apex_available: [ "myapex" ],
 		}
 
-		cc_library {
+		cc_library_shared {
 			name: "mylib2",
 			srcs: ["mylib.cpp"],
 			system_shared_libs: [],
@@ -381,6 +383,16 @@
 			],
 		}
 
+		cc_prebuilt_library_shared {
+			name: "mylib2",
+			srcs: ["prebuilt.so"],
+			// TODO: remove //apex_available:platform
+			apex_available: [
+				"//apex_available:platform",
+				"myapex",
+			],
+    }
+
 		cc_library_static {
 			name: "libstatic",
 			srcs: ["mylib.cpp"],
@@ -874,58 +886,89 @@
 
 }
 
-func TestApexDependencyToLLNDK(t *testing.T) {
-	ctx, _ := testApex(t, `
-		apex {
-			name: "myapex",
-			key: "myapex.key",
-			use_vendor: true,
-			native_shared_libs: ["mylib"],
-		}
+func TestApexDependsOnLLNDKTransitively(t *testing.T) {
+	testcases := []struct {
+		name          string
+		minSdkVersion string
+		shouldLink    string
+		shouldNotLink []string
+	}{
+		{
+			name:          "should link to the latest",
+			minSdkVersion: "current",
+			shouldLink:    "30",
+			shouldNotLink: []string{"29"},
+		},
+		{
+			name:          "should link to llndk#29",
+			minSdkVersion: "29",
+			shouldLink:    "29",
+			shouldNotLink: []string{"30"},
+		},
+	}
+	for _, tc := range testcases {
+		t.Run(tc.name, func(t *testing.T) {
+			ctx, _ := testApex(t, `
+			apex {
+				name: "myapex",
+				key: "myapex.key",
+				use_vendor: true,
+				native_shared_libs: ["mylib"],
+				min_sdk_version: "`+tc.minSdkVersion+`",
+			}
 
-		apex_key {
-			name: "myapex.key",
-			public_key: "testkey.avbpubkey",
-			private_key: "testkey.pem",
-		}
+			apex_key {
+				name: "myapex.key",
+				public_key: "testkey.avbpubkey",
+				private_key: "testkey.pem",
+			}
 
-		cc_library {
-			name: "mylib",
-			srcs: ["mylib.cpp"],
-			vendor_available: true,
-			shared_libs: ["libbar"],
-			system_shared_libs: [],
-			stl: "none",
-			apex_available: [ "myapex" ],
-		}
+			cc_library {
+				name: "mylib",
+				srcs: ["mylib.cpp"],
+				vendor_available: true,
+				shared_libs: ["libbar"],
+				system_shared_libs: [],
+				stl: "none",
+				apex_available: [ "myapex" ],
+			}
 
-		cc_library {
-			name: "libbar",
-			srcs: ["mylib.cpp"],
-			system_shared_libs: [],
-			stl: "none",
-		}
+			cc_library {
+				name: "libbar",
+				srcs: ["mylib.cpp"],
+				system_shared_libs: [],
+				stl: "none",
+				stubs: { versions: ["29","30"] },
+			}
 
-		llndk_library {
-			name: "libbar",
-			symbol_file: "",
-		}
-	`, func(fs map[string][]byte, config android.Config) {
-		setUseVendorWhitelistForTest(config, []string{"myapex"})
-	})
+			llndk_library {
+				name: "libbar",
+				symbol_file: "",
+			}
+			`, func(fs map[string][]byte, config android.Config) {
+				setUseVendorWhitelistForTest(config, []string{"myapex"})
+			}, withUnbundledBuild)
 
-	apexRule := ctx.ModuleForTests("myapex", "android_common_myapex_image").Rule("apexRule")
-	copyCmds := apexRule.Args["copy_commands"]
+			// Ensure that LLNDK dep is not included
+			ensureExactContents(t, ctx, "myapex", "android_common_myapex_image", []string{
+				"lib64/mylib.so",
+			})
 
-	// Ensure that LLNDK dep is not included
-	ensureNotContains(t, copyCmds, "image.apex/lib64/libbar.so")
+			// Ensure that LLNDK dep is required
+			apexManifestRule := ctx.ModuleForTests("myapex", "android_common_myapex_image").Rule("apexManifestRule")
+			ensureListEmpty(t, names(apexManifestRule.Args["provideNativeLibs"]))
+			ensureListContains(t, names(apexManifestRule.Args["requireNativeLibs"]), "libbar.so")
 
-	apexManifestRule := ctx.ModuleForTests("myapex", "android_common_myapex_image").Rule("apexManifestRule")
-	ensureListEmpty(t, names(apexManifestRule.Args["provideNativeLibs"]))
+			mylibLdFlags := ctx.ModuleForTests("mylib", "android_vendor.VER_arm64_armv8-a_shared_myapex").Rule("ld").Args["libFlags"]
+			ensureContains(t, mylibLdFlags, "libbar.llndk/android_vendor.VER_arm64_armv8-a_shared_"+tc.shouldLink+"/libbar.so")
+			for _, ver := range tc.shouldNotLink {
+				ensureNotContains(t, mylibLdFlags, "libbar.llndk/android_vendor.VER_arm64_armv8-a_shared_"+ver+"/libbar.so")
+			}
 
-	// Ensure that LLNDK dep is required
-	ensureListContains(t, names(apexManifestRule.Args["requireNativeLibs"]), "libbar.so")
-
+			mylibCFlags := ctx.ModuleForTests("mylib", "android_vendor.VER_arm64_armv8-a_static_myapex").Rule("cc").Args["cFlags"]
+			ensureContains(t, mylibCFlags, "__LIBBAR_API__="+tc.shouldLink)
+		})
+	}
 }
 
 func TestApexWithSystemLibsStubs(t *testing.T) {
@@ -1191,7 +1234,7 @@
 	expectNoLink("libz", "shared", "libz", "shared")
 }
 
-func TestQApexesUseLatestStubsInBundledBuilds(t *testing.T) {
+func TestQApexesUseLatestStubsInBundledBuildsAndHWASAN(t *testing.T) {
 	ctx, _ := testApex(t, `
 		apex {
 			name: "myapex",
@@ -1218,16 +1261,18 @@
 				versions: ["29", "30"],
 			},
 		}
-	`)
+	`, func(fs map[string][]byte, config android.Config) {
+		config.TestProductVariables.SanitizeDevice = []string{"hwaddress"}
+	})
 	expectLink := func(from, from_variant, to, to_variant string) {
 		ld := ctx.ModuleForTests(from, "android_arm64_armv8-a_"+from_variant).Rule("ld")
 		libFlags := ld.Args["libFlags"]
 		ensureContains(t, libFlags, "android_arm64_armv8-a_"+to_variant+"/"+to+".so")
 	}
-	expectLink("libx", "shared_myapex", "libbar", "shared_30")
+	expectLink("libx", "shared_hwasan_myapex", "libbar", "shared_30")
 }
 
-func TestQTargetApexUseStaticUnwinder(t *testing.T) {
+func TestQTargetApexUsesStaticUnwinder(t *testing.T) {
 	ctx, _ := testApex(t, `
 		apex {
 			name: "myapex",
@@ -1246,8 +1291,7 @@
 			name: "libx",
 			apex_available: [ "myapex" ],
 		}
-
-	`, withUnbundledBuild)
+	`)
 
 	// ensure apex variant of c++ is linked with static unwinder
 	cm := ctx.ModuleForTests("libc++", "android_arm64_armv8-a_shared_myapex").Module().(*cc.Module)
@@ -1255,14 +1299,10 @@
 	// note that platform variant is not.
 	cm = ctx.ModuleForTests("libc++", "android_arm64_armv8-a_shared").Module().(*cc.Module)
 	ensureListNotContains(t, cm.Properties.AndroidMkStaticLibs, "libgcc_stripped")
-
-	libFlags := ctx.ModuleForTests("libx", "android_arm64_armv8-a_shared_myapex").Rule("ld").Args["libFlags"]
-	ensureContains(t, libFlags, "android_arm64_armv8-a_shared_myapex/libc++.so")
-	ensureContains(t, libFlags, "android_arm64_armv8-a_shared_29/libc.so") // min_sdk_version applied
 }
 
 func TestInvalidMinSdkVersion(t *testing.T) {
-	testApexError(t, `"libz" .*: min_sdk_version is set 29.*`, `
+	testApexError(t, `"libz" .*: not found a version\(<=29\)`, `
 		apex {
 			name: "myapex",
 			key: "myapex.key",
@@ -1292,9 +1332,9 @@
 				versions: ["30"],
 			},
 		}
-	`, withUnbundledBuild)
+	`)
 
-	testApexError(t, `"myapex" .*: min_sdk_version: should be .*`, `
+	testApexError(t, `"myapex" .*: min_sdk_version: should be "current" or <number>`, `
 		apex {
 			name: "myapex",
 			key: "myapex.key",
@@ -1797,6 +1837,7 @@
 				"myapex",
 				"otherapex",
 			],
+			recovery_available: true,
 		}
 		cc_library {
 			name: "mylib2",
@@ -1814,7 +1855,7 @@
 	// non-APEX variant does not have __ANDROID_APEX__ defined
 	mylibCFlags := ctx.ModuleForTests("mylib", "android_arm64_armv8-a_static").Rule("cc").Args["cFlags"]
 	ensureNotContains(t, mylibCFlags, "-D__ANDROID_APEX__")
-	ensureContains(t, mylibCFlags, "-D__ANDROID_SDK_VERSION__=10000")
+	ensureNotContains(t, mylibCFlags, "-D__ANDROID_SDK_VERSION__")
 
 	// APEX variant has __ANDROID_APEX__ and __ANDROID_APEX_SDK__ defined
 	mylibCFlags = ctx.ModuleForTests("mylib", "android_arm64_armv8-a_static_myapex").Rule("cc").Args["cFlags"]
@@ -1846,6 +1887,11 @@
 	ensureContains(t, mylibCFlags, "-D__ANDROID_APEX__")
 	ensureNotContains(t, mylibCFlags, "-D__ANDROID_APEX_MYAPEX__")
 	ensureContains(t, mylibCFlags, "-D__ANDROID_APEX_OTHERAPEX__")
+
+	// recovery variant does not set __ANDROID_SDK_VERSION__
+	mylibCFlags = ctx.ModuleForTests("mylib", "android_recovery_arm64_armv8-a_static").Rule("cc").Args["cFlags"]
+	ensureNotContains(t, mylibCFlags, "-D__ANDROID_APEX__")
+	ensureNotContains(t, mylibCFlags, "-D__ANDROID_SDK_VERSION__")
 }
 
 func TestHeaderLibsDependency(t *testing.T) {
@@ -3468,7 +3514,7 @@
 	}`)
 }
 
-func TestApexAvailable(t *testing.T) {
+func TestApexAvailable_DirectDep(t *testing.T) {
 	// libfoo is not available to myapex, but only to otherapex
 	testApexError(t, "requires \"libfoo\" that is not available for the APEX", `
 	apex {
@@ -3501,9 +3547,17 @@
 		system_shared_libs: [],
 		apex_available: ["otherapex"],
 	}`)
+}
 
+func TestApexAvailable_IndirectDep(t *testing.T) {
 	// libbbaz is an indirect dep
-	testApexError(t, "requires \"libbaz\" that is not available for the APEX", `
+	testApexError(t, `requires "libbaz" that is not available for the APEX. Dependency path:
+.*via tag apex\.dependencyTag.*"sharedLib".*
+.*-> libfoo.*link:shared.*
+.*via tag cc\.DependencyTag.*"shared".*
+.*-> libbar.*link:shared.*
+.*via tag cc\.DependencyTag.*"shared".*
+.*-> libbaz.*link:shared.*`, `
 	apex {
 		name: "myapex",
 		key: "myapex.key",
@@ -3537,7 +3591,9 @@
 		stl: "none",
 		system_shared_libs: [],
 	}`)
+}
 
+func TestApexAvailable_InvalidApexName(t *testing.T) {
 	testApexError(t, "\"otherapex\" is not a valid module name", `
 	apex {
 		name: "myapex",
@@ -3558,7 +3614,7 @@
 		apex_available: ["otherapex"],
 	}`)
 
-	ctx, _ := testApex(t, `
+	testApex(t, `
 	apex {
 		name: "myapex",
 		key: "myapex.key",
@@ -3594,7 +3650,9 @@
 			versions: ["10", "20", "30"],
 		},
 	}`)
+}
 
+func TestApexAvailable_CreatedForPlatform(t *testing.T) {
 	// check that libfoo and libbar are created only for myapex, but not for the platform
 	// TODO(jiyong) the checks for the platform variant are removed because we now create
 	// the platform variant regardless of the apex_availability. Instead, we will make sure that
@@ -3606,7 +3664,7 @@
 	//	ensureListContains(t, ctx.ModuleVariantsForTests("libbar"), "android_arm64_armv8-a_shared_myapex")
 	//	ensureListNotContains(t, ctx.ModuleVariantsForTests("libbar"), "android_arm64_armv8-a_shared")
 
-	ctx, _ = testApex(t, `
+	ctx, _ := testApex(t, `
 	apex {
 		name: "myapex",
 		key: "myapex.key",
@@ -3628,8 +3686,10 @@
 	// check that libfoo is created only for the platform
 	ensureListNotContains(t, ctx.ModuleVariantsForTests("libfoo"), "android_arm64_armv8-a_shared_myapex")
 	ensureListContains(t, ctx.ModuleVariantsForTests("libfoo"), "android_arm64_armv8-a_shared")
+}
 
-	ctx, _ = testApex(t, `
+func TestApexAvailable_CreatedForApex(t *testing.T) {
+	testApex(t, `
 	apex {
 		name: "myapex",
 		key: "myapex.key",
@@ -4144,6 +4204,175 @@
 	ensureContains(t, content, `"apex_config":{"apex_embedded_apk_config":[{"package_name":"com.android.foo","path":"app/AppFoo/AppFoo.apk"}]}`)
 }
 
+func testNoUpdatableJarsInBootImage(t *testing.T, errmsg, bp string, transformDexpreoptConfig func(*dexpreopt.GlobalConfig)) {
+	t.Helper()
+
+	bp = bp + `
+		filegroup {
+			name: "some-updatable-apex-file_contexts",
+			srcs: [
+				"system/sepolicy/apex/some-updatable-apex-file_contexts",
+			],
+		}
+	`
+	bp += cc.GatherRequiredDepsForTest(android.Android)
+	bp += java.GatherRequiredDepsForTest()
+	bp += dexpreopt.BpToolModulesForTest()
+
+	fs := map[string][]byte{
+		"a.java":                             nil,
+		"a.jar":                              nil,
+		"build/make/target/product/security": nil,
+		"apex_manifest.json":                 nil,
+		"AndroidManifest.xml":                nil,
+		"system/sepolicy/apex/some-updatable-apex-file_contexts":       nil,
+		"system/sepolicy/apex/com.android.art.something-file_contexts": nil,
+		"framework/aidl/a.aidl": nil,
+	}
+	cc.GatherRequiredFilesForTest(fs)
+
+	ctx := android.NewTestArchContext()
+	ctx.RegisterModuleType("apex", BundleFactory)
+	ctx.RegisterModuleType("apex_key", ApexKeyFactory)
+	ctx.RegisterModuleType("filegroup", android.FileGroupFactory)
+	cc.RegisterRequiredBuildComponentsForTest(ctx)
+	java.RegisterJavaBuildComponents(ctx)
+	java.RegisterSystemModulesBuildComponents(ctx)
+	java.RegisterAppBuildComponents(ctx)
+	java.RegisterDexpreoptBootJarsComponents(ctx)
+	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
+	ctx.PostDepsMutators(android.RegisterOverridePostDepsMutators)
+	ctx.PreDepsMutators(RegisterPreDepsMutators)
+	ctx.PostDepsMutators(RegisterPostDepsMutators)
+
+	config := android.TestArchConfig(buildDir, nil, bp, fs)
+	ctx.Register(config)
+
+	_ = dexpreopt.GlobalSoongConfigForTests(config)
+	dexpreopt.RegisterToolModulesForTest(ctx)
+	pathCtx := android.PathContextForTesting(config)
+	dexpreoptConfig := dexpreopt.GlobalConfigForTests(pathCtx)
+	transformDexpreoptConfig(dexpreoptConfig)
+	dexpreopt.SetTestGlobalConfig(config, dexpreoptConfig)
+
+	_, errs := ctx.ParseBlueprintsFiles("Android.bp")
+	android.FailIfErrored(t, errs)
+
+	_, errs = ctx.PrepareBuildActions(config)
+	if errmsg == "" {
+		android.FailIfErrored(t, errs)
+	} else if len(errs) > 0 {
+		android.FailIfNoMatchingErrors(t, errmsg, errs)
+		return
+	} else {
+		t.Fatalf("missing expected error %q (0 errors are returned)", errmsg)
+	}
+}
+
+func TestNoUpdatableJarsInBootImage(t *testing.T) {
+	bp := `
+		java_library {
+			name: "some-updatable-apex-lib",
+			srcs: ["a.java"],
+			apex_available: [
+				"some-updatable-apex",
+			],
+		}
+
+		java_library {
+			name: "some-platform-lib",
+			srcs: ["a.java"],
+			installable: true,
+		}
+
+		java_library {
+			name: "some-art-lib",
+			srcs: ["a.java"],
+			apex_available: [
+				"com.android.art.something",
+			],
+			hostdex: true,
+		}
+
+		apex {
+			name: "some-updatable-apex",
+			key: "some-updatable-apex.key",
+			java_libs: ["some-updatable-apex-lib"],
+		}
+
+		apex_key {
+			name: "some-updatable-apex.key",
+		}
+
+		apex {
+			name: "com.android.art.something",
+			key: "com.android.art.something.key",
+			java_libs: ["some-art-lib"],
+		}
+
+		apex_key {
+			name: "com.android.art.something.key",
+		}
+	`
+
+	var error string
+	var transform func(*dexpreopt.GlobalConfig)
+
+	// updatable jar from ART apex in the ART boot image => ok
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.ArtApexJars = []string{"some-art-lib"}
+	}
+	testNoUpdatableJarsInBootImage(t, "", bp, transform)
+
+	// updatable jar from ART apex in the framework boot image => error
+	error = "module 'some-art-lib' from updatable apex 'com.android.art.something' is not allowed in the framework boot image"
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.BootJars = []string{"some-art-lib"}
+	}
+	testNoUpdatableJarsInBootImage(t, error, bp, transform)
+
+	// updatable jar from some other apex in the ART boot image => error
+	error = "module 'some-updatable-apex-lib' from updatable apex 'some-updatable-apex' is not allowed in the ART boot image"
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.ArtApexJars = []string{"some-updatable-apex-lib"}
+	}
+	testNoUpdatableJarsInBootImage(t, error, bp, transform)
+
+	// updatable jar from some other apex in the framework boot image => error
+	error = "module 'some-updatable-apex-lib' from updatable apex 'some-updatable-apex' is not allowed in the framework boot image"
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.BootJars = []string{"some-updatable-apex-lib"}
+	}
+	testNoUpdatableJarsInBootImage(t, error, bp, transform)
+
+	// nonexistent jar in the ART boot image => error
+	error = "failed to find a dex jar path for module 'nonexistent'"
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.ArtApexJars = []string{"nonexistent"}
+	}
+	testNoUpdatableJarsInBootImage(t, error, bp, transform)
+
+	// nonexistent jar in the framework boot image => error
+	error = "failed to find a dex jar path for module 'nonexistent'"
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.BootJars = []string{"nonexistent"}
+	}
+	testNoUpdatableJarsInBootImage(t, error, bp, transform)
+
+	// platform jar in the ART boot image => error
+	error = "module 'some-platform-lib' is part of the platform and not allowed in the ART boot image"
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.ArtApexJars = []string{"some-platform-lib"}
+	}
+	testNoUpdatableJarsInBootImage(t, error, bp, transform)
+
+	// platform jar in the framework boot image => ok
+	transform = func(config *dexpreopt.GlobalConfig) {
+		config.BootJars = []string{"some-platform-lib"}
+	}
+	testNoUpdatableJarsInBootImage(t, "", bp, transform)
+}
+
 func TestMain(m *testing.M) {
 	run := func() int {
 		setUp()
diff --git a/apex/builder.go b/apex/builder.go
index 67bc206..5a2134a 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -230,12 +230,16 @@
 func (a *apexBundle) buildNoticeFiles(ctx android.ModuleContext, apexFileName string) android.NoticeOutputs {
 	var noticeFiles android.Paths
 
-	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) {
+	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) bool {
 		if externalDep {
-			return
+			// As soon as the dependency graph crosses the APEX boundary, don't go further.
+			return false
 		}
+
 		notices := to.NoticeFiles()
 		noticeFiles = append(noticeFiles, notices...)
+
+		return true
 	})
 
 	if len(noticeFiles) == 0 {
diff --git a/apex/key.go b/apex/key.go
index ffde315..607cac5 100644
--- a/apex/key.go
+++ b/apex/key.go
@@ -133,17 +133,18 @@
 		module := apexModulesMap[key]
 		if m, ok := module.(*apexBundle); ok {
 			fmt.Fprintf(&filecontent,
-				"name=%q public_key=%q private_key=%q container_certificate=%q container_private_key=%q\\n",
+				"name=%q public_key=%q private_key=%q container_certificate=%q container_private_key=%q partition=%q\\n",
 				m.Name()+".apex",
 				m.public_key_file.String(),
 				m.private_key_file.String(),
 				m.container_certificate_file.String(),
-				m.container_private_key_file.String())
+				m.container_private_key_file.String(),
+				m.PartitionTag(ctx.DeviceConfig()))
 		} else if m, ok := module.(*Prebuilt); ok {
 			fmt.Fprintf(&filecontent,
-				"name=%q public_key=%q private_key=%q container_certificate=%q container_private_key=%q\\n",
+				"name=%q public_key=%q private_key=%q container_certificate=%q container_private_key=%q partition=%q\\n",
 				m.InstallFilename(),
-				"PRESIGNED", "PRESIGNED", "PRESIGNED", "PRESIGNED")
+				"PRESIGNED", "PRESIGNED", "PRESIGNED", "PRESIGNED", m.PartitionTag(ctx.DeviceConfig()))
 		}
 	}
 
diff --git a/bpf/bpf.go b/bpf/bpf.go
index 59d1502..4cdfb31 100644
--- a/bpf/bpf.go
+++ b/bpf/bpf.go
@@ -60,6 +60,10 @@
 func (bpf *bpf) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	cflags := []string{
 		"-nostdlibinc",
+
+		// Make paths in deps files relative
+		"-no-canonical-prefixes",
+
 		"-O2",
 		"-isystem bionic/libc/include",
 		"-isystem bionic/libc/kernel/uapi",
diff --git a/bpfix/bpfix/bpfix.go b/bpfix/bpfix/bpfix.go
index 0516279..a1c5de1 100644
--- a/bpfix/bpfix/bpfix.go
+++ b/bpfix/bpfix/bpfix.go
@@ -124,6 +124,10 @@
 		Name: "removeHidlInterfaceTypes",
 		Fix:  removeHidlInterfaceTypes,
 	},
+	{
+		Name: "removeSoongConfigBoolVariable",
+		Fix:  removeSoongConfigBoolVariable,
+	},
 }
 
 func NewFixRequest() FixRequest {
@@ -714,6 +718,78 @@
 	return nil
 }
 
+func removeSoongConfigBoolVariable(f *Fixer) error {
+	found := map[string]bool{}
+	newDefs := make([]parser.Definition, 0, len(f.tree.Defs))
+	for _, def := range f.tree.Defs {
+		if mod, ok := def.(*parser.Module); ok && mod.Type == "soong_config_bool_variable" {
+			if name, ok := getLiteralStringPropertyValue(mod, "name"); ok {
+				found[name] = true
+			} else {
+				return fmt.Errorf("Found soong_config_bool_variable without a name")
+			}
+		} else {
+			newDefs = append(newDefs, def)
+		}
+	}
+	f.tree.Defs = newDefs
+
+	if len(found) == 0 {
+		return nil
+	}
+
+	return runPatchListMod(func(mod *parser.Module, buf []byte, patchList *parser.PatchList) error {
+		if mod.Type != "soong_config_module_type" {
+			return nil
+		}
+
+		variables, ok := getLiteralListProperty(mod, "variables")
+		if !ok {
+			return nil
+		}
+
+		boolValues := strings.Builder{}
+		empty := true
+		for _, item := range variables.Values {
+			nameValue, ok := item.(*parser.String)
+			if !ok {
+				empty = false
+				continue
+			}
+			if found[nameValue.Value] {
+				patchList.Add(item.Pos().Offset, item.End().Offset+2, "")
+
+				boolValues.WriteString(`"`)
+				boolValues.WriteString(nameValue.Value)
+				boolValues.WriteString(`",`)
+			} else {
+				empty = false
+			}
+		}
+		if empty {
+			*patchList = parser.PatchList{}
+
+			prop, _ := mod.GetProperty("variables")
+			patchList.Add(prop.Pos().Offset, prop.End().Offset+2, "")
+		}
+		if boolValues.Len() == 0 {
+			return nil
+		}
+
+		bool_variables, ok := getLiteralListProperty(mod, "bool_variables")
+		if ok {
+			patchList.Add(bool_variables.RBracePos.Offset, bool_variables.RBracePos.Offset, ","+boolValues.String())
+		} else {
+			patchList.Add(variables.RBracePos.Offset+2, variables.RBracePos.Offset+2,
+				fmt.Sprintf(`bool_variables: [%s],`, boolValues.String()))
+		}
+
+		return nil
+	})(f)
+
+	return nil
+}
+
 // Converts the default source list property, 'srcs', to a single source property with a given name.
 // "LOCAL_MODULE" reference is also resolved during the conversion process.
 func convertToSingleSource(mod *parser.Module, srcPropertyName string) {
diff --git a/bpfix/bpfix/bpfix_test.go b/bpfix/bpfix/bpfix_test.go
index 38cefdd..64a7b93 100644
--- a/bpfix/bpfix/bpfix_test.go
+++ b/bpfix/bpfix/bpfix_test.go
@@ -918,3 +918,67 @@
 		})
 	}
 }
+
+func TestRemoveSoongConfigBoolVariable(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		out  string
+	}{
+		{
+			name: "remove bool",
+			in: `
+				soong_config_module_type {
+					name: "foo",
+					variables: ["bar", "baz"],
+				}
+
+				soong_config_bool_variable {
+					name: "bar",
+				}
+
+				soong_config_string_variable {
+					name: "baz",
+				}
+			`,
+			out: `
+				soong_config_module_type {
+					name: "foo",
+					variables: [
+						"baz"
+					],
+					bool_variables: ["bar"],
+				}
+
+				soong_config_string_variable {
+					name: "baz",
+				}
+			`,
+		},
+		{
+			name: "existing bool_variables",
+			in: `
+				soong_config_module_type {
+					name: "foo",
+					variables: ["baz"],
+					bool_variables: ["bar"],
+				}
+
+				soong_config_bool_variable {
+					name: "baz",
+				}
+			`,
+			out: `
+				soong_config_module_type {
+					name: "foo",
+					bool_variables: ["bar", "baz"],
+				}
+			`,
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			runPass(t, test.in, test.out, removeSoongConfigBoolVariable)
+		})
+	}
+}
diff --git a/cc/binary_sdk_member.go b/cc/binary_sdk_member.go
index 9b3235c..1d9cc54 100644
--- a/cc/binary_sdk_member.go
+++ b/cc/binary_sdk_member.go
@@ -18,6 +18,7 @@
 	"path/filepath"
 
 	"android/soong/android"
+
 	"github.com/google/blueprint"
 )
 
@@ -137,7 +138,9 @@
 		propertySet.AddPropertyWithTag("shared_libs", p.SharedLibs, builder.SdkMemberReferencePropertyTag(false))
 	}
 
-	if len(p.SystemSharedLibs) > 0 {
+	// SystemSharedLibs needs to be propagated if it's a list, even if it's empty,
+	// so check for non-nil instead of nonzero length.
+	if p.SystemSharedLibs != nil {
 		propertySet.AddPropertyWithTag("system_shared_libs", p.SystemSharedLibs, builder.SdkMemberReferencePropertyTag(false))
 	}
 }
diff --git a/cc/cc.go b/cc/cc.go
index 794adf1..4667a3d 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -393,7 +393,7 @@
 
 type specifiedDeps struct {
 	sharedLibs       []string
-	systemSharedLibs []string
+	systemSharedLibs []string // Note nil and [] are semantically distinct.
 }
 
 type installer interface {
@@ -503,6 +503,9 @@
 	makeLinkType string
 	// Kythe (source file indexer) paths for this compilation module
 	kytheFiles android.Paths
+
+	// For apex variants, this is set as apex.min_sdk_version
+	apexSdkVersion int
 }
 
 func (c *Module) Toc() android.OptionalPath {
@@ -644,6 +647,10 @@
 			c.Properties.PreventInstall = true
 			return
 		}
+		if _, ok := c.linker.(*llndkStubDecorator); ok {
+			c.Properties.HideFromMake = true
+			return
+		}
 	}
 	panic(fmt.Errorf("SetBuildStubs called on non-library module: %q", c.BaseModuleName()))
 }
@@ -663,6 +670,10 @@
 			library.MutatedProperties.StubsVersion = version
 			return
 		}
+		if llndk, ok := c.linker.(*llndkStubDecorator); ok {
+			llndk.libraryDecorator.MutatedProperties.StubsVersion = version
+			return
+		}
 	}
 	panic(fmt.Errorf("SetStubsVersions called on non-library module: %q", c.BaseModuleName()))
 }
@@ -672,6 +683,9 @@
 		if library, ok := c.linker.(*libraryDecorator); ok {
 			return library.MutatedProperties.StubsVersion
 		}
+		if llndk, ok := c.linker.(*llndkStubDecorator); ok {
+			return llndk.libraryDecorator.MutatedProperties.StubsVersion
+		}
 	}
 	panic(fmt.Errorf("StubsVersion called on non-library module: %q", c.BaseModuleName()))
 }
@@ -1228,7 +1242,7 @@
 }
 
 func (ctx *moduleContextImpl) apexSdkVersion() int {
-	return ctx.mod.ApexProperties.Info.MinSdkVersion
+	return ctx.mod.apexSdkVersion
 }
 
 func (ctx *moduleContextImpl) hasStubsVariants() bool {
@@ -1868,7 +1882,10 @@
 		}, depTag, lib)
 	}
 
-	if deps.StaticUnwinderIfLegacy && ctx.Config().UnbundledBuild() {
+	// staticUnwinderDep is treated as staticDep for Q apexes
+	// so that native libraries/binaries are linked with static unwinder
+	// because Q libc doesn't have unwinder APIs
+	if deps.StaticUnwinderIfLegacy {
 		actx.AddVariationDependencies([]blueprint.Variation{
 			{Mutator: "link", Variation: "static"},
 		}, staticUnwinderDepTag, staticUnwinder(actx))
@@ -1883,7 +1900,7 @@
 	addSharedLibDependencies := func(depTag DependencyTag, name string, version string) {
 		var variations []blueprint.Variation
 		variations = append(variations, blueprint.Variation{Mutator: "link", Variation: "shared"})
-		versionVariantAvail := !ctx.useVndk() && !c.InRecovery() && !c.InRamdisk()
+		versionVariantAvail := !c.InRecovery() && !c.InRamdisk()
 		if version != "" && versionVariantAvail {
 			// Version is explicitly specified. i.e. libFoo#30
 			variations = append(variations, blueprint.Variation{Mutator: "version", Variation: version})
@@ -2218,13 +2235,17 @@
 		if depTag == android.ProtoPluginDepTag {
 			return
 		}
+		if depTag == llndkImplDep {
+			return
+		}
 
 		if dep.Target().Os != ctx.Os() {
 			ctx.ModuleErrorf("OS mismatch between %q and %q", ctx.ModuleName(), depName)
 			return
 		}
 		if dep.Target().Arch.ArchType != ctx.Arch().ArchType {
-			ctx.ModuleErrorf("Arch mismatch between %q and %q", ctx.ModuleName(), depName)
+			ctx.ModuleErrorf("Arch mismatch between %q(%v) and %q(%v)",
+				ctx.ModuleName(), ctx.Arch().ArchType, depName, dep.Target().Arch.ArchType)
 			return
 		}
 
@@ -2248,9 +2269,22 @@
 			}
 		}
 
+		// For the dependency from platform to apex, use the latest stubs
+		c.apexSdkVersion = android.FutureApiLevel
+		if !c.IsForPlatform() {
+			c.apexSdkVersion = c.ApexProperties.Info.MinSdkVersion
+		}
+
+		if android.InList("hwaddress", ctx.Config().SanitizeDevice()) {
+			// In hwasan build, we override apexSdkVersion to the FutureApiLevel(10000)
+			// so that even Q(29/Android10) apexes could use the dynamic unwinder by linking the newer stubs(e.g libc(R+)).
+			// (b/144430859)
+			c.apexSdkVersion = android.FutureApiLevel
+		}
+
 		if depTag == staticUnwinderDepTag {
-			// Use static unwinder for legacy (min_sdk_version = 29) apexes  (b/144430859)
-			if c.ShouldSupportAndroid10() {
+			// Use static unwinder for legacy (min_sdk_version = 29) apexes (b/144430859)
+			if c.apexSdkVersion <= android.SdkVersion_Android10 {
 				depTag = StaticDepTag
 			} else {
 				return
@@ -2304,8 +2338,7 @@
 
 				// when to use (unspecified) stubs, check min_sdk_version and choose the right one
 				if useThisDep && depIsStubs && !explicitlyVersioned {
-					useLatest := c.IsForPlatform() || (c.ShouldSupportAndroid10() && !ctx.Config().UnbundledBuild())
-					versionToUse, err := c.ChooseSdkVersion(ccDep.StubsVersions(), useLatest)
+					versionToUse, err := c.ChooseSdkVersion(ccDep.StubsVersions(), c.apexSdkVersion)
 					if err != nil {
 						ctx.OtherModuleErrorf(dep, err.Error())
 						return
@@ -2319,6 +2352,26 @@
 					return // stop processing this dep
 				}
 			}
+			if c.UseVndk() {
+				if m, ok := ccDep.(*Module); ok && m.IsStubs() { // LLNDK
+					// by default, use current version of LLNDK
+					versionToUse := ""
+					versions := stubsVersionsFor(ctx.Config())[depName]
+					if c.ApexName() != "" && len(versions) > 0 {
+						// if this is for use_vendor apex && dep has stubsVersions
+						// apply the same rule of apex sdk enforcement to choose right version
+						var err error
+						versionToUse, err = c.ChooseSdkVersion(versions, c.apexSdkVersion)
+						if err != nil {
+							ctx.OtherModuleErrorf(dep, err.Error())
+							return
+						}
+					}
+					if versionToUse != ccDep.StubsVersion() {
+						return
+					}
+				}
+			}
 
 			depPaths.IncludeDirs = append(depPaths.IncludeDirs, ccDep.IncludeDirs()...)
 
diff --git a/cc/cc_test.go b/cc/cc_test.go
index 9a9678f..67eb248 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -2398,6 +2398,34 @@
 	}
 }
 
+func TestLlndkLibrary(t *testing.T) {
+	ctx := testCc(t, `
+	cc_library {
+		name: "libllndk",
+		stubs: { versions: ["1", "2"] },
+	}
+	llndk_library {
+		name: "libllndk",
+	}
+	`)
+	actual := ctx.ModuleVariantsForTests("libllndk.llndk")
+	expected := []string{
+		"android_vendor.VER_arm64_armv8-a_shared",
+		"android_vendor.VER_arm64_armv8-a_shared_1",
+		"android_vendor.VER_arm64_armv8-a_shared_2",
+		"android_vendor.VER_arm_armv7-a-neon_shared",
+		"android_vendor.VER_arm_armv7-a-neon_shared_1",
+		"android_vendor.VER_arm_armv7-a-neon_shared_2",
+	}
+	checkEquals(t, "variants for llndk stubs", expected, actual)
+
+	params := ctx.ModuleForTests("libllndk.llndk", "android_vendor.VER_arm_armv7-a-neon_shared").Description("generate stub")
+	checkEquals(t, "use VNDK version for default stubs", "current", params.Args["apiLevel"])
+
+	params = ctx.ModuleForTests("libllndk.llndk", "android_vendor.VER_arm_armv7-a-neon_shared_1").Description("generate stub")
+	checkEquals(t, "override apiLevel for versioned stubs", "1", params.Args["apiLevel"])
+}
+
 func TestLlndkHeaders(t *testing.T) {
 	ctx := testCc(t, `
 	llndk_headers {
diff --git a/cc/compiler.go b/cc/compiler.go
index fe81bd0..681b1ab 100644
--- a/cc/compiler.go
+++ b/cc/compiler.go
@@ -315,18 +315,6 @@
 			"-isystem "+getCurrentIncludePath(ctx).Join(ctx, config.NDKTriple(tc)).String())
 	}
 
-	if ctx.canUseSdk() {
-		sdkVersion := ctx.sdkVersion()
-		if sdkVersion == "" || sdkVersion == "current" {
-			if ctx.isForPlatform() {
-				sdkVersion = strconv.Itoa(android.FutureApiLevel)
-			} else {
-				sdkVersion = strconv.Itoa(ctx.apexSdkVersion())
-			}
-		}
-		flags.Global.CommonFlags = append(flags.Global.CommonFlags, "-D__ANDROID_SDK_VERSION__="+sdkVersion)
-	}
-
 	if ctx.useVndk() {
 		flags.Global.CommonFlags = append(flags.Global.CommonFlags, "-D__ANDROID_VNDK__")
 	}
@@ -340,6 +328,9 @@
 		if Bool(compiler.Properties.Use_apex_name_macro) {
 			flags.Global.CommonFlags = append(flags.Global.CommonFlags, "-D__ANDROID_APEX_"+makeDefineString(ctx.apexName())+"__")
 		}
+		if ctx.Device() {
+			flags.Global.CommonFlags = append(flags.Global.CommonFlags, "-D__ANDROID_SDK_VERSION__="+strconv.Itoa(ctx.apexSdkVersion()))
+		}
 	}
 
 	instructionSet := String(compiler.Properties.Instruction_set)
diff --git a/cc/config/global.go b/cc/config/global.go
index 29020ab..5611a96 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -127,8 +127,8 @@
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-r377782c"
-	ClangDefaultShortVersion = "10.0.5"
+	ClangDefaultVersion      = "clang-r377782d"
+	ClangDefaultShortVersion = "10.0.6"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{
diff --git a/cc/config/x86_darwin_host.go b/cc/config/x86_darwin_host.go
index 25225b5..8eb79e3 100644
--- a/cc/config/x86_darwin_host.go
+++ b/cc/config/x86_darwin_host.go
@@ -15,9 +15,11 @@
 package config
 
 import (
+	"fmt"
 	"os/exec"
 	"path/filepath"
 	"strings"
+	"sync"
 
 	"android/soong/android"
 )
@@ -89,28 +91,20 @@
 )
 
 func init() {
-	pctx.VariableFunc("macSdkPath", func(ctx android.PackageVarContext) string {
-		xcodeselect := ctx.Config().HostSystemTool("xcode-select")
-		bytes, err := exec.Command(xcodeselect, "--print-path").Output()
-		if err != nil {
-			ctx.Errorf("xcode-select failed with: %q", err.Error())
-		}
-		return strings.TrimSpace(string(bytes))
-	})
 	pctx.VariableFunc("macSdkRoot", func(ctx android.PackageVarContext) string {
-		return xcrunSdk(ctx, "--show-sdk-path")
+		return getMacTools(ctx).sdkRoot
 	})
 	pctx.StaticVariable("macMinVersion", "10.10")
 	pctx.VariableFunc("MacArPath", func(ctx android.PackageVarContext) string {
-		return xcrun(ctx, "--find", "ar")
+		return getMacTools(ctx).arPath
 	})
 
 	pctx.VariableFunc("MacStripPath", func(ctx android.PackageVarContext) string {
-		return xcrun(ctx, "--find", "strip")
+		return getMacTools(ctx).stripPath
 	})
 
 	pctx.VariableFunc("MacToolPath", func(ctx android.PackageVarContext) string {
-		return filepath.Dir(xcrun(ctx, "--find", "ld"))
+		return getMacTools(ctx).toolPath
 	})
 
 	pctx.StaticVariable("DarwinGccVersion", darwinGccVersion)
@@ -126,38 +120,66 @@
 	pctx.StaticVariable("DarwinYasmFlags", "-f macho -m amd64")
 }
 
-func xcrun(ctx android.PackageVarContext, args ...string) string {
-	xcrun := ctx.Config().HostSystemTool("xcrun")
-	bytes, err := exec.Command(xcrun, args...).Output()
-	if err != nil {
-		ctx.Errorf("xcrun failed with: %q", err.Error())
-	}
-	return strings.TrimSpace(string(bytes))
+type macPlatformTools struct {
+	once sync.Once
+	err  error
+
+	sdkRoot   string
+	arPath    string
+	stripPath string
+	toolPath  string
 }
 
-func xcrunSdk(ctx android.PackageVarContext, arg string) string {
-	xcrun := ctx.Config().HostSystemTool("xcrun")
-	if selected := ctx.Config().Getenv("MAC_SDK_VERSION"); selected != "" {
-		if !inList(selected, darwinSupportedSdkVersions) {
-			ctx.Errorf("MAC_SDK_VERSION %s isn't supported: %q", selected, darwinSupportedSdkVersions)
+var macTools = &macPlatformTools{}
+
+func getMacTools(ctx android.PackageVarContext) *macPlatformTools {
+	macTools.once.Do(func() {
+		xcrunTool := ctx.Config().HostSystemTool("xcrun")
+
+		xcrun := func(args ...string) string {
+			if macTools.err != nil {
+				return ""
+			}
+
+			bytes, err := exec.Command(xcrunTool, args...).Output()
+			if err != nil {
+				macTools.err = fmt.Errorf("xcrun %q failed with: %q", args, err)
+				return ""
+			}
+
+			return strings.TrimSpace(string(bytes))
+		}
+
+		xcrunSdk := func(arg string) string {
+			if selected := ctx.Config().Getenv("MAC_SDK_VERSION"); selected != "" {
+				if !inList(selected, darwinSupportedSdkVersions) {
+					macTools.err = fmt.Errorf("MAC_SDK_VERSION %s isn't supported: %q", selected, darwinSupportedSdkVersions)
+					return ""
+				}
+
+				return xcrun("--sdk", "macosx"+selected, arg)
+			}
+
+			for _, sdk := range darwinSupportedSdkVersions {
+				bytes, err := exec.Command(xcrunTool, "--sdk", "macosx"+sdk, arg).Output()
+				if err == nil {
+					return strings.TrimSpace(string(bytes))
+				}
+			}
+			macTools.err = fmt.Errorf("Could not find a supported mac sdk: %q", darwinSupportedSdkVersions)
 			return ""
 		}
 
-		bytes, err := exec.Command(xcrun, "--sdk", "macosx"+selected, arg).Output()
-		if err != nil {
-			ctx.Errorf("MAC_SDK_VERSION %s is not installed", selected)
-		}
-		return strings.TrimSpace(string(bytes))
-	}
+		macTools.sdkRoot = xcrunSdk("--show-sdk-path")
 
-	for _, sdk := range darwinSupportedSdkVersions {
-		bytes, err := exec.Command(xcrun, "--sdk", "macosx"+sdk, arg).Output()
-		if err == nil {
-			return strings.TrimSpace(string(bytes))
-		}
+		macTools.arPath = xcrun("--find", "ar")
+		macTools.stripPath = xcrun("--find", "strip")
+		macTools.toolPath = filepath.Dir(xcrun("--find", "ld"))
+	})
+	if macTools.err != nil {
+		ctx.Errorf("%q", macTools.err)
 	}
-	ctx.Errorf("Could not find a supported mac sdk: %q", darwinSupportedSdkVersions)
-	return ""
+	return macTools
 }
 
 type toolchainDarwin struct {
diff --git a/cc/fuzz.go b/cc/fuzz.go
index 6a9b709..b7173a3 100644
--- a/cc/fuzz.go
+++ b/cc/fuzz.go
@@ -198,6 +198,11 @@
 	return installLocation
 }
 
+// Get the device-only shared library symbols install directory.
+func sharedLibrarySymbolsInstallLocation(libraryPath android.Path, archString string) string {
+	return filepath.Join("$(PRODUCT_OUT)/symbols/data/fuzz/", archString, "/lib/", libraryPath.Base())
+}
+
 func (fuzz *fuzzBinary) install(ctx ModuleContext, file android.Path) {
 	fuzz.binaryDecorator.baseInstaller.dir = filepath.Join(
 		"fuzz", ctx.Target().Arch.ArchType.String(), ctx.ModuleName())
@@ -269,6 +274,12 @@
 		fuzz.installedSharedDeps = append(fuzz.installedSharedDeps,
 			sharedLibraryInstallLocation(
 				lib, ctx.Host(), ctx.Arch().ArchType.String()))
+
+		// Also add the dependency on the shared library symbols dir.
+		if !ctx.Host() {
+			fuzz.installedSharedDeps = append(fuzz.installedSharedDeps,
+				sharedLibrarySymbolsInstallLocation(lib, ctx.Arch().ArchType.String()))
+		}
 	}
 }
 
@@ -419,12 +430,24 @@
 				continue
 			}
 			sharedLibraryInstalled[installDestination] = true
+
 			// Escape all the variables, as the install destination here will be called
 			// via. $(eval) in Make.
 			installDestination = strings.ReplaceAll(
 				installDestination, "$", "$$")
 			s.sharedLibInstallStrings = append(s.sharedLibInstallStrings,
 				library.String()+":"+installDestination)
+
+			// Ensure that on device, the library is also reinstalled to the /symbols/
+			// dir. Symbolized DSO's are always installed to the device when fuzzing, but
+			// we want symbolization tools (like `stack`) to be able to find the symbols
+			// in $ANDROID_PRODUCT_OUT/symbols automagically.
+			if !ccModule.Host() {
+				symbolsInstallDestination := sharedLibrarySymbolsInstallLocation(library, archString)
+				symbolsInstallDestination = strings.ReplaceAll(symbolsInstallDestination, "$", "$$")
+				s.sharedLibInstallStrings = append(s.sharedLibInstallStrings,
+					library.String()+":"+symbolsInstallDestination)
+			}
 		}
 
 		// The executable.
diff --git a/cc/library.go b/cc/library.go
index 5ce854e..140f87a 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -376,7 +376,7 @@
 	useCoreVariant       bool
 	checkSameCoreVariant bool
 
-	// Decorated interafaces
+	// Decorated interfaces
 	*baseCompiler
 	*baseLinker
 	*baseInstaller
@@ -749,10 +749,12 @@
 
 func (library *libraryDecorator) linkerDeps(ctx DepsContext, deps Deps) Deps {
 	if library.static() {
+		// Compare with nil because an empty list needs to be propagated.
 		if library.StaticProperties.Static.System_shared_libs != nil {
 			library.baseLinker.Properties.System_shared_libs = library.StaticProperties.Static.System_shared_libs
 		}
 	} else if library.shared() {
+		// Compare with nil because an empty list needs to be propagated.
 		if library.SharedProperties.Shared.System_shared_libs != nil {
 			library.baseLinker.Properties.System_shared_libs = library.SharedProperties.Shared.System_shared_libs
 		}
@@ -828,10 +830,21 @@
 	}
 
 	specifiedDeps.sharedLibs = append(specifiedDeps.sharedLibs, properties.Shared_libs...)
-	specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, properties.System_shared_libs...)
+
+	// Must distinguish nil and [] in system_shared_libs - ensure that [] in
+	// either input list doesn't come out as nil.
+	if specifiedDeps.systemSharedLibs == nil {
+		specifiedDeps.systemSharedLibs = properties.System_shared_libs
+	} else {
+		specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, properties.System_shared_libs...)
+	}
 
 	specifiedDeps.sharedLibs = android.FirstUniqueStrings(specifiedDeps.sharedLibs)
-	specifiedDeps.systemSharedLibs = android.FirstUniqueStrings(specifiedDeps.systemSharedLibs)
+	if len(specifiedDeps.systemSharedLibs) > 0 {
+		// Skip this if systemSharedLibs is either nil or [], to ensure they are
+		// retained.
+		specifiedDeps.systemSharedLibs = android.FirstUniqueStrings(specifiedDeps.systemSharedLibs)
+	}
 	return specifiedDeps
 }
 
@@ -1011,8 +1024,9 @@
 }
 
 func getRefAbiDumpFile(ctx ModuleContext, vndkVersion, fileName string) android.Path {
+	// The logic must be consistent with classifySourceAbiDump.
 	isNdk := ctx.isNdk()
-	isLlndkOrVndk := ctx.isLlndkPublic(ctx.Config()) || ctx.isVndk()
+	isLlndkOrVndk := ctx.isLlndkPublic(ctx.Config()) || (ctx.useVndk() && ctx.isVndk())
 
 	refAbiDumpTextFile := android.PathForVndkRefAbiDump(ctx, vndkVersion, fileName, isNdk, isLlndkOrVndk, false)
 	refAbiDumpGzipFile := android.PathForVndkRefAbiDump(ctx, vndkVersion, fileName, isNdk, isLlndkOrVndk, true)
@@ -1371,6 +1385,8 @@
 			len(sharedCompiler.SharedProperties.Shared.Static_libs) == 0 &&
 			len(staticCompiler.StaticProperties.Static.Shared_libs) == 0 &&
 			len(sharedCompiler.SharedProperties.Shared.Shared_libs) == 0 &&
+			// Compare System_shared_libs properties with nil because empty lists are
+			// semantically significant for them.
 			staticCompiler.StaticProperties.Static.System_shared_libs == nil &&
 			sharedCompiler.SharedProperties.Shared.System_shared_libs == nil {
 
@@ -1487,6 +1503,19 @@
 	}
 }
 
+func createVersionVariations(mctx android.BottomUpMutatorContext, versions []string) {
+	// "" is for the non-stubs variant
+	versions = append([]string{""}, versions...)
+
+	modules := mctx.CreateVariations(versions...)
+	for i, m := range modules {
+		if versions[i] != "" {
+			m.(LinkableInterface).SetBuildStubs()
+			m.(LinkableInterface).SetStubsVersions(versions[i])
+		}
+	}
+}
+
 // Version mutator splits a module into the mandatory non-stubs variant
 // (which is unnamed) and zero or more stubs variants.
 func VersionMutator(mctx android.BottomUpMutatorContext) {
@@ -1498,24 +1527,30 @@
 				return
 			}
 
-			// save the list of versions for later use
 			stubsVersionsLock.Lock()
 			defer stubsVersionsLock.Unlock()
+			// save the list of versions for later use
 			stubsVersionsFor(mctx.Config())[mctx.ModuleName()] = versions
 
-			// "" is for the non-stubs variant
-			versions = append([]string{""}, versions...)
-
-			modules := mctx.CreateVariations(versions...)
-			for i, m := range modules {
-				if versions[i] != "" {
-					m.(LinkableInterface).SetBuildStubs()
-					m.(LinkableInterface).SetStubsVersions(versions[i])
-				}
-			}
-		} else {
-			mctx.CreateVariations("")
+			createVersionVariations(mctx, versions)
+			return
 		}
+
+		if c, ok := library.(*Module); ok && c.IsStubs() {
+			stubsVersionsLock.Lock()
+			defer stubsVersionsLock.Unlock()
+			// For LLNDK llndk_library, we borrow vstubs.ersions from its implementation library.
+			// Since llndk_library has dependency to its implementation library,
+			// we can safely access stubsVersionsFor() with its baseModuleName.
+			versions := stubsVersionsFor(mctx.Config())[c.BaseModuleName()]
+			// save the list of versions for later use
+			stubsVersionsFor(mctx.Config())[mctx.ModuleName()] = versions
+
+			createVersionVariations(mctx, versions)
+			return
+		}
+
+		mctx.CreateVariations("")
 		return
 	}
 	if genrule, ok := mctx.Module().(*genrule.Module); ok {
diff --git a/cc/library_sdk_member.go b/cc/library_sdk_member.go
index 4967455..754b96a 100644
--- a/cc/library_sdk_member.go
+++ b/cc/library_sdk_member.go
@@ -212,7 +212,9 @@
 		outputProperties.AddPropertyWithTag("shared_libs", libInfo.SharedLibs, builder.SdkMemberReferencePropertyTag(false))
 	}
 
-	if len(libInfo.SystemSharedLibs) > 0 {
+	// SystemSharedLibs needs to be propagated if it's a list, even if it's empty,
+	// so check for non-nil instead of nonzero length.
+	if libInfo.SystemSharedLibs != nil {
 		outputProperties.AddPropertyWithTag("system_shared_libs", libInfo.SystemSharedLibs, builder.SdkMemberReferencePropertyTag(false))
 	}
 
@@ -267,6 +269,11 @@
 	for property, dirs := range includeDirs {
 		outputProperties.AddProperty(property, dirs)
 	}
+
+	if len(libInfo.StubsVersion) > 0 {
+		stubsSet := outputProperties.AddPropertySet("stubs")
+		stubsSet.AddProperty("versions", []string{libInfo.StubsVersion})
+	}
 }
 
 const (
@@ -327,11 +334,16 @@
 	// This field is exported as its contents may not be arch specific.
 	SharedLibs []string
 
-	// The set of system shared libraries
+	// The set of system shared libraries. Note nil and [] are semantically
+	// distinct - see BaseLinkerProperties.System_shared_libs.
 	//
 	// This field is exported as its contents may not be arch specific.
 	SystemSharedLibs []string
 
+	// The specific stubs version for the lib variant, or empty string if stubs
+	// are not in use.
+	StubsVersion string
+
 	// outputFile is not exported as it is always arch specific.
 	outputFile android.Path
 }
@@ -367,6 +379,10 @@
 		p.SystemSharedLibs = specifiedDeps.systemSharedLibs
 	}
 	p.exportedGeneratedHeaders = ccModule.ExportedGeneratedHeaders()
+
+	if ccModule.HasStubsVariants() {
+		p.StubsVersion = ccModule.StubsVersion()
+	}
 }
 
 func (p *nativeLibInfoProperties) AddToPropertySet(ctx android.SdkMemberContext, propertySet android.BpPropertySet) {
diff --git a/cc/linker.go b/cc/linker.go
index 385e04e..57a0c01 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -502,7 +502,15 @@
 
 func (linker *baseLinker) linkerSpecifiedDeps(specifiedDeps specifiedDeps) specifiedDeps {
 	specifiedDeps.sharedLibs = append(specifiedDeps.sharedLibs, linker.Properties.Shared_libs...)
-	specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, linker.Properties.System_shared_libs...)
+
+	// Must distinguish nil and [] in system_shared_libs - ensure that [] in
+	// either input list doesn't come out as nil.
+	if specifiedDeps.systemSharedLibs == nil {
+		specifiedDeps.systemSharedLibs = linker.Properties.System_shared_libs
+	} else {
+		specifiedDeps.systemSharedLibs = append(specifiedDeps.systemSharedLibs, linker.Properties.System_shared_libs...)
+	}
+
 	return specifiedDeps
 }
 
diff --git a/cc/llndk_library.go b/cc/llndk_library.go
index 3dee692..09050aa 100644
--- a/cc/llndk_library.go
+++ b/cc/llndk_library.go
@@ -19,8 +19,14 @@
 	"strings"
 
 	"android/soong/android"
+
+	"github.com/google/blueprint"
 )
 
+var llndkImplDep = struct {
+	blueprint.DependencyTag
+}{}
+
 var (
 	llndkLibrarySuffix = ".llndk"
 	llndkHeadersSuffix = ".llndk"
@@ -81,6 +87,9 @@
 		// For non-enforcing devices, vndkVer is empty. Use "current" in that case, too.
 		vndkVer = "current"
 	}
+	if stub.stubsVersion() != "" {
+		vndkVer = stub.stubsVersion()
+	}
 	objs, versionScript := compileStubLibrary(ctx, flags, String(stub.Properties.Symbol_file), vndkVer, "--llndk")
 	stub.versionScriptPath = versionScript
 	return objs
@@ -154,6 +163,10 @@
 		stub.libraryDecorator.flagExporter.Properties.Export_include_dirs = []string{}
 	}
 
+	if stub.stubsVersion() != "" {
+		stub.reexportFlags("-D" + versioningMacroName(ctx.baseModuleName()) + "=" + stub.stubsVersion())
+	}
+
 	return stub.libraryDecorator.link(ctx, flags, deps, objs)
 }
 
diff --git a/cc/ndk_prebuilt.go b/cc/ndk_prebuilt.go
index f909add..c4d7708 100644
--- a/cc/ndk_prebuilt.go
+++ b/cc/ndk_prebuilt.go
@@ -92,6 +92,11 @@
 	return ndkPrebuiltModuleToPath(ctx, flags.Toolchain, objectExtension, ctx.sdkVersion())
 }
 
+func (*ndkPrebuiltObjectLinker) availableFor(what string) bool {
+	// ndk prebuilt objects are available to everywhere
+	return true
+}
+
 type ndkPrebuiltStlLinker struct {
 	*libraryDecorator
 }
@@ -105,6 +110,11 @@
 	return deps
 }
 
+func (*ndkPrebuiltStlLinker) availableFor(what string) bool {
+	// ndk prebuilt objects are available to everywhere
+	return true
+}
+
 // ndk_prebuilt_shared_stl exports a precompiled ndk shared standard template
 // library (stl) library for linking operation. The soong's module name format
 // is ndk_<NAME>.so where the library is located under
diff --git a/cc/pgo.go b/cc/pgo.go
index d5c4b87..88903bb 100644
--- a/cc/pgo.go
+++ b/cc/pgo.go
@@ -88,20 +88,21 @@
 	return []interface{}{&pgo.Properties}
 }
 
-func (props *PgoProperties) addProfileGatherFlags(ctx ModuleContext, flags Flags) Flags {
+func (props *PgoProperties) addInstrumentationProfileGatherFlags(ctx ModuleContext, flags Flags) Flags {
 	flags.Local.CFlags = append(flags.Local.CFlags, props.Pgo.Cflags...)
 
-	if props.isInstrumentation() {
-		flags.Local.CFlags = append(flags.Local.CFlags, profileInstrumentFlag)
-		// The profile runtime is added below in deps().  Add the below
-		// flag, which is the only other link-time action performed by
-		// the Clang driver during link.
-		flags.Local.LdFlags = append(flags.Local.LdFlags, "-u__llvm_profile_runtime")
-	}
-	if props.isSampling() {
-		flags.Local.CFlags = append(flags.Local.CFlags, profileSamplingFlag)
-		flags.Local.LdFlags = append(flags.Local.LdFlags, profileSamplingFlag)
-	}
+	flags.Local.CFlags = append(flags.Local.CFlags, profileInstrumentFlag)
+	// The profile runtime is added below in deps().  Add the below
+	// flag, which is the only other link-time action performed by
+	// the Clang driver during link.
+	flags.Local.LdFlags = append(flags.Local.LdFlags, "-u__llvm_profile_runtime")
+	return flags
+}
+func (props *PgoProperties) addSamplingProfileGatherFlags(ctx ModuleContext, flags Flags) Flags {
+	flags.Local.CFlags = append(flags.Local.CFlags, props.Pgo.Cflags...)
+
+	flags.Local.CFlags = append(flags.Local.CFlags, profileSamplingFlag)
+	flags.Local.LdFlags = append(flags.Local.LdFlags, profileSamplingFlag)
 	return flags
 }
 
@@ -286,8 +287,12 @@
 	props := pgo.Properties
 
 	// Add flags to profile this module based on its profile_kind
-	if props.ShouldProfileModule {
-		return props.addProfileGatherFlags(ctx, flags)
+	if props.ShouldProfileModule && props.isInstrumentation() {
+		return props.addInstrumentationProfileGatherFlags(ctx, flags)
+	} else if props.ShouldProfileModule && props.isSampling() {
+		return props.addSamplingProfileGatherFlags(ctx, flags)
+	} else if ctx.DeviceConfig().SamplingPGO() {
+		return props.addSamplingProfileGatherFlags(ctx, flags)
 	}
 
 	if !ctx.Config().IsEnvTrue("ANDROID_PGO_NO_PROFILE_USE") {
diff --git a/cc/prebuilt_test.go b/cc/prebuilt_test.go
index 242d835..0b018c1 100644
--- a/cc/prebuilt_test.go
+++ b/cc/prebuilt_test.go
@@ -22,6 +22,25 @@
 	"github.com/google/blueprint"
 )
 
+func testPrebuilt(t *testing.T, bp string, fs map[string][]byte) *android.TestContext {
+	config := TestConfig(buildDir, android.Android, nil, bp, fs)
+	ctx := CreateTestContext()
+
+	// Enable androidmk support.
+	// * Register the singleton
+	// * Configure that we are inside make
+	// * Add CommonOS to ensure that androidmk processing works.
+	android.RegisterAndroidMkBuildComponents(ctx)
+	android.SetInMakeForTests(config)
+
+	ctx.Register(config)
+	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
+	android.FailIfErrored(t, errs)
+	_, errs = ctx.PrepareBuildActions(config)
+	android.FailIfErrored(t, errs)
+	return ctx
+}
+
 func TestPrebuilt(t *testing.T) {
 	bp := `
 		cc_library {
@@ -84,7 +103,15 @@
 		}
 	`
 
-	ctx := testPrebuilt(t, bp)
+	ctx := testPrebuilt(t, bp, map[string][]byte{
+		"liba.so": nil,
+		"libb.a":  nil,
+		"libd.so": nil,
+		"libe.a":  nil,
+		"libf.a":  nil,
+		"libf.so": nil,
+		"crtx.o":  nil,
+	})
 
 	// Verify that all the modules exist and that their dependencies were connected correctly
 	liba := ctx.ModuleForTests("liba", "android_arm64_armv8-a_shared").Module()
@@ -143,35 +170,6 @@
 	}
 }
 
-func testPrebuilt(t *testing.T, bp string) *android.TestContext {
-
-	fs := map[string][]byte{
-		"liba.so": nil,
-		"libb.a":  nil,
-		"libd.so": nil,
-		"libe.a":  nil,
-		"libf.a":  nil,
-		"libf.so": nil,
-		"crtx.o":  nil,
-	}
-	config := TestConfig(buildDir, android.Android, nil, bp, fs)
-	ctx := CreateTestContext()
-
-	// Enable androidmk support.
-	// * Register the singleton
-	// * Configure that we are inside make
-	// * Add CommonOS to ensure that androidmk processing works.
-	android.RegisterAndroidMkBuildComponents(ctx)
-	android.SetInMakeForTests(config)
-
-	ctx.Register(config)
-	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
-	android.FailIfErrored(t, errs)
-	_, errs = ctx.PrepareBuildActions(config)
-	android.FailIfErrored(t, errs)
-	return ctx
-}
-
 func TestPrebuiltLibraryShared(t *testing.T) {
 	ctx := testPrebuilt(t, `
 	cc_prebuilt_library_shared {
@@ -181,7 +179,9 @@
         none: true,
     },
 	}
-	`)
+	`, map[string][]byte{
+		"libf.so": nil,
+	})
 
 	shared := ctx.ModuleForTests("libtest", "android_arm64_armv8-a_shared").Module().(*Module)
 	assertString(t, shared.OutputFile().String(), "libf.so")
@@ -193,7 +193,9 @@
 		name: "libtest",
 		srcs: ["libf.a"],
 	}
-	`)
+	`, map[string][]byte{
+		"libf.a": nil,
+	})
 
 	static := ctx.ModuleForTests("libtest", "android_arm64_armv8-a_static").Module().(*Module)
 	assertString(t, static.OutputFile().String(), "libf.a")
@@ -213,7 +215,10 @@
         none: true,
     },
 	}
-	`)
+	`, map[string][]byte{
+		"libf.a":  nil,
+		"libf.so": nil,
+	})
 
 	shared := ctx.ModuleForTests("libtest", "android_arm64_armv8-a_shared").Module().(*Module)
 	assertString(t, shared.OutputFile().String(), "libf.so")
diff --git a/cc/testing.go b/cc/testing.go
index 89a9c36..53f0995 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -67,6 +67,20 @@
 			src: "",
 		}
 
+		cc_prebuilt_library_shared {
+			name: "libclang_rt.hwasan-aarch64-android",
+			nocrt: true,
+			vendor_available: true,
+			recovery_available: true,
+			system_shared_libs: [],
+			stl: "none",
+			srcs: [""],
+			check_elf_files: false,
+			sanitize: {
+				never: true,
+			},
+		}
+
 		toolchain_library {
 			name: "libclang_rt.builtins-i686-android",
 			vendor_available: true,
@@ -220,6 +234,10 @@
 			vendor_available: true,
 			recovery_available: true,
 			host_supported: true,
+			apex_available: [
+				"//apex_available:platform",
+				"//apex_available:anyapex",
+			],
 		}
 		cc_library {
 			name: "libc++",
@@ -248,6 +266,10 @@
 			host_supported: false,
 			vendor_available: true,
 			recovery_available: true,
+			apex_available: [
+				"//apex_available:platform",
+				"//apex_available:anyapex",
+			],
 		}
 		cc_library {
 			name: "libunwind_llvm",
@@ -259,8 +281,21 @@
 			recovery_available: true,
 		}
 
+		cc_defaults {
+			name: "crt_defaults",
+			recovery_available: true,
+			vendor_available: true,
+			native_bridge_supported: true,
+			stl: "none",
+			apex_available: [
+				"//apex_available:platform",
+				"//apex_available:anyapex",
+			],
+		}
+
 		cc_object {
 			name: "crtbegin_so",
+			defaults: ["crt_defaults"],
 			recovery_available: true,
 			vendor_available: true,
 			native_bridge_supported: true,
@@ -269,6 +304,7 @@
 
 		cc_object {
 			name: "crtbegin_dynamic",
+			defaults: ["crt_defaults"],
 			recovery_available: true,
 			vendor_available: true,
 			native_bridge_supported: true,
@@ -277,6 +313,7 @@
 
 		cc_object {
 			name: "crtbegin_static",
+			defaults: ["crt_defaults"],
 			recovery_available: true,
 			vendor_available: true,
 			native_bridge_supported: true,
@@ -285,6 +322,7 @@
 
 		cc_object {
 			name: "crtend_so",
+			defaults: ["crt_defaults"],
 			recovery_available: true,
 			vendor_available: true,
 			native_bridge_supported: true,
@@ -293,6 +331,7 @@
 
 		cc_object {
 			name: "crtend_android",
+			defaults: ["crt_defaults"],
 			recovery_available: true,
 			vendor_available: true,
 			native_bridge_supported: true,
diff --git a/cc/vndk.go b/cc/vndk.go
index e02e7b5..4888dcf 100644
--- a/cc/vndk.go
+++ b/cc/vndk.go
@@ -297,6 +297,9 @@
 	if !Bool(lib.Properties.Vendor_available) {
 		vndkPrivateLibraries(mctx.Config())[name] = filename
 	}
+	if mctx.OtherModuleExists(name) {
+		mctx.AddFarVariationDependencies(m.Target().Variations(), llndkImplDep, name)
+	}
 }
 
 func processVndkLibrary(mctx android.BottomUpMutatorContext, m *Module) {
diff --git a/cmd/zipsync/zipsync.go b/cmd/zipsync/zipsync.go
index a6023d3..294e5ef 100644
--- a/cmd/zipsync/zipsync.go
+++ b/cmd/zipsync/zipsync.go
@@ -115,7 +115,7 @@
 
 			filename := filepath.Join(*outputDir, name)
 			if f.FileInfo().IsDir() {
-				must(os.MkdirAll(filename, f.FileInfo().Mode()))
+				must(os.MkdirAll(filename, 0777))
 			} else {
 				must(os.MkdirAll(filepath.Dir(filename), 0777))
 				in, err := f.Open()
diff --git a/cuj/cuj.go b/cuj/cuj.go
index c7ff8ff..3333012 100644
--- a/cuj/cuj.go
+++ b/cuj/cuj.go
@@ -33,8 +33,9 @@
 )
 
 type Test struct {
-	name string
-	args []string
+	name   string
+	args   []string
+	before func() error
 
 	results TestResults
 }
@@ -119,6 +120,15 @@
 	t.results.metrics = met
 }
 
+// Touch the Intent.java file to cause a rebuild of the frameworks to monitor the
+// incremental build speed as mentioned b/152046247. Intent.java file was chosen
+// as it is a key component of the framework and is often modified.
+func touchIntentFile() error {
+	const intentFileName = "frameworks/base/core/java/android/content/Intent.java"
+	currentTime := time.Now().Local()
+	return os.Chtimes(intentFileName, currentTime, currentTime)
+}
+
 func main() {
 	outDir := os.Getenv("OUT_DIR")
 	if outDir == "" {
@@ -170,6 +180,36 @@
 			name: "framework_rebuild_twice",
 			args: []string{"framework"},
 		},
+		{
+			// Scenario major_inc_build (b/152046247): tracking build speed of major incremental build.
+			name: "major_inc_build_droid",
+			args: []string{"droid"},
+		},
+		{
+			name:   "major_inc_build_framework_minus_apex_after_droid_build",
+			args:   []string{"framework-minus-apex"},
+			before: touchIntentFile,
+		},
+		{
+			name:   "major_inc_build_framework_after_droid_build",
+			args:   []string{"framework"},
+			before: touchIntentFile,
+		},
+		{
+			name:   "major_inc_build_sync_after_droid_build",
+			args:   []string{"sync"},
+			before: touchIntentFile,
+		},
+		{
+			name:   "major_inc_build_droid_rebuild",
+			args:   []string{"droid"},
+			before: touchIntentFile,
+		},
+		{
+			name:   "major_inc_build_update_api_after_droid_rebuild",
+			args:   []string{"update-api"},
+			before: touchIntentFile,
+		},
 	}
 
 	cujMetrics := metrics.NewCriticalUserJourneysMetrics()
@@ -178,6 +218,12 @@
 	for i, t := range tests {
 		logsSubDir := fmt.Sprintf("%02d_%s", i, t.name)
 		logsDir := filepath.Join(cujDir, "logs", logsSubDir)
+		if t.before != nil {
+			if err := t.before(); err != nil {
+				fmt.Printf("error running before function on test %q: %v\n", t.name, err)
+				break
+			}
+		}
 		t.Run(logsDir)
 		if t.results.err != nil {
 			fmt.Printf("error running test %q: %s\n", t.name, t.results.err)
diff --git a/dexpreopt/dexpreopt.go b/dexpreopt/dexpreopt.go
index 02e54b3..0e1bfc6 100644
--- a/dexpreopt/dexpreopt.go
+++ b/dexpreopt/dexpreopt.go
@@ -589,7 +589,7 @@
 // at that time (Soong processes the jars in dependency order, which may be different from the
 // the system server classpath order).
 func SystemServerDexJarHostPath(ctx android.PathContext, jar string) android.OutputPath {
-	return android.PathForOutput(ctx, ctx.Config().BuildDir(), "system_server_dexjars", jar+".jar")
+	return android.PathForOutput(ctx, "system_server_dexjars", jar+".jar")
 }
 
 func contains(l []string, s string) bool {
diff --git a/java/androidmk.go b/java/androidmk.go
index d76e29b..136bb36 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -72,6 +72,7 @@
 	if !hideFromMake {
 		mainEntries = android.AndroidMkEntries{
 			Class:      "JAVA_LIBRARIES",
+			DistFile:   android.OptionalPathForPath(library.distFile),
 			OutputFile: android.OptionalPathForPath(library.outputFile),
 			Include:    "$(BUILD_SYSTEM)/soong_java_prebuilt.mk",
 			ExtraEntries: []android.AndroidMkExtraEntriesFunc{
@@ -275,7 +276,7 @@
 }
 
 func (app *AndroidApp) AndroidMkEntries() []android.AndroidMkEntries {
-	if !app.IsForPlatform() {
+	if !app.IsForPlatform() || app.appProperties.HideFromMake {
 		return []android.AndroidMkEntries{android.AndroidMkEntries{
 			Disabled: true,
 		}}
@@ -288,6 +289,7 @@
 			func(entries *android.AndroidMkEntries) {
 				// App module names can be overridden.
 				entries.SetString("LOCAL_MODULE", app.installApkName)
+				entries.SetBoolIfTrue("LOCAL_UNINSTALLABLE_MODULE", app.appProperties.PreventInstall)
 				entries.SetPath("LOCAL_SOONG_RESOURCE_EXPORT_PACKAGE", app.exportPackage)
 				if app.dexJarFile != nil {
 					entries.SetPath("LOCAL_SOONG_DEX_JAR", app.dexJarFile)
@@ -347,6 +349,9 @@
 				for _, jniLib := range app.installJniLibs {
 					entries.AddStrings("LOCAL_SOONG_JNI_LIBS_"+jniLib.target.Arch.ArchType.String(), jniLib.name)
 				}
+				if len(app.jniCoverageOutputs) > 0 {
+					entries.AddStrings("LOCAL_PREBUILT_COVERAGE_ARCHIVE", app.jniCoverageOutputs.Strings()...)
+				}
 				if len(app.dexpreopter.builtInstalled) > 0 {
 					entries.SetString("LOCAL_SOONG_BUILT_INSTALLED", app.dexpreopter.builtInstalled)
 				}
@@ -542,6 +547,7 @@
 func (dstubs *Droidstubs) AndroidMkEntries() []android.AndroidMkEntries {
 	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
+		DistFile:   android.OptionalPathForPath(dstubs.apiFile),
 		OutputFile: android.OptionalPathForPath(dstubs.stubsSrcJar),
 		Include:    "$(BUILD_SYSTEM)/soong_droiddoc_prebuilt.mk",
 		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
diff --git a/java/androidmk_test.go b/java/androidmk_test.go
index acc6bf0..7daa624 100644
--- a/java/androidmk_test.go
+++ b/java/androidmk_test.go
@@ -16,6 +16,7 @@
 
 import (
 	"reflect"
+	"strings"
 	"testing"
 
 	"android/soong/android"
@@ -133,3 +134,38 @@
 		t.Errorf("Unexpected required modules - expected: %q, actual: %q", expected, actual)
 	}
 }
+
+func TestDistWithTag(t *testing.T) {
+	ctx, config := testJava(t, `
+		java_library {
+			name: "foo_without_tag",
+			srcs: ["a.java"],
+			compile_dex: true,
+			dist: {
+				targets: ["hi"],
+			},
+		}
+		java_library {
+			name: "foo_with_tag",
+			srcs: ["a.java"],
+			compile_dex: true,
+			dist: {
+				targets: ["hi"],
+				tag: ".jar",
+			},
+		}
+	`)
+
+	without_tag_entries := android.AndroidMkEntriesForTest(t, config, "", ctx.ModuleForTests("foo_without_tag", "android_common").Module())
+	with_tag_entries := android.AndroidMkEntriesForTest(t, config, "", ctx.ModuleForTests("foo_with_tag", "android_common").Module())
+
+	if len(without_tag_entries) != 2 || len(with_tag_entries) != 2 {
+		t.Errorf("two mk entries per module expected, got %d and %d", len(without_tag_entries), len(with_tag_entries))
+	}
+	if !with_tag_entries[0].DistFile.Valid() || !strings.Contains(with_tag_entries[0].DistFile.String(), "/javac/foo_with_tag.jar") {
+		t.Errorf("expected classes.jar DistFile, got %v", with_tag_entries[0].DistFile)
+	}
+	if without_tag_entries[0].DistFile.Valid() {
+		t.Errorf("did not expect explicit DistFile, got %v", without_tag_entries[0].DistFile)
+	}
+}
diff --git a/java/app.go b/java/app.go
index 346f155..6a0aa8f 100755
--- a/java/app.go
+++ b/java/app.go
@@ -105,6 +105,11 @@
 	// If set, find and merge all NOTICE files that this module and its dependencies have and store
 	// it in the APK as an asset.
 	Embed_notices *bool
+
+	// cc.Coverage related properties
+	PreventInstall    bool `blueprint:"mutated"`
+	HideFromMake      bool `blueprint:"mutated"`
+	IsCoverageVariant bool `blueprint:"mutated"`
 }
 
 // android_app properties that can be overridden by override_android_app
@@ -133,7 +138,8 @@
 
 	overridableAppProperties overridableAppProperties
 
-	installJniLibs []jniLib
+	installJniLibs     []jniLib
+	jniCoverageOutputs android.Paths
 
 	bundleFile android.Path
 
@@ -171,6 +177,10 @@
 	return a.certificate
 }
 
+func (a *AndroidApp) JniCoverageOutputs() android.Paths {
+	return a.jniCoverageOutputs
+}
+
 var _ AndroidLibraryDependency = (*AndroidApp)(nil)
 
 type Certificate struct {
@@ -380,6 +390,11 @@
 		if a.shouldEmbedJnis(ctx) {
 			jniJarFile = android.PathForModuleOut(ctx, "jnilibs.zip")
 			TransformJniLibsToJar(ctx, jniJarFile, jniLibs, a.useEmbeddedNativeLibs(ctx))
+			for _, jni := range jniLibs {
+				if jni.coverageFile.Valid() {
+					a.jniCoverageOutputs = append(a.jniCoverageOutputs, jni.coverageFile.Path())
+				}
+			}
 		} else {
 			a.installJniLibs = jniLibs
 		}
@@ -521,14 +536,28 @@
 
 	// Build a final signed app package.
 	packageFile := android.PathForModuleOut(ctx, a.installApkName+".apk")
-	CreateAndSignAppPackage(ctx, packageFile, a.exportPackage, jniJarFile, dexJarFile, certificates, apkDeps)
+	v4SigningRequested := Bool(a.Module.deviceProperties.V4_signature)
+	var v4SignatureFile android.WritablePath = nil
+	if v4SigningRequested {
+		v4SignatureFile = android.PathForModuleOut(ctx, a.installApkName+".apk.idsig")
+	}
+	CreateAndSignAppPackage(ctx, packageFile, a.exportPackage, jniJarFile, dexJarFile, certificates, apkDeps, v4SignatureFile)
 	a.outputFile = packageFile
+	if v4SigningRequested {
+		a.extraOutputFiles = append(a.extraOutputFiles, v4SignatureFile)
+	}
 
 	for _, split := range a.aapt.splits {
 		// Sign the split APKs
 		packageFile := android.PathForModuleOut(ctx, a.installApkName+"_"+split.suffix+".apk")
-		CreateAndSignAppPackage(ctx, packageFile, split.path, nil, nil, certificates, apkDeps)
+		if v4SigningRequested {
+			v4SignatureFile = android.PathForModuleOut(ctx, a.installApkName+"_"+split.suffix+".apk.idsig")
+		}
+		CreateAndSignAppPackage(ctx, packageFile, split.path, nil, nil, certificates, apkDeps, v4SignatureFile)
 		a.extraOutputFiles = append(a.extraOutputFiles, packageFile)
+		if v4SigningRequested {
+			a.extraOutputFiles = append(a.extraOutputFiles, v4SignatureFile)
+		}
 	}
 
 	// Build an app bundle.
@@ -582,9 +611,10 @@
 
 				if lib.Valid() {
 					jniLibs = append(jniLibs, jniLib{
-						name:   ctx.OtherModuleName(module),
-						path:   path,
-						target: module.Target(),
+						name:         ctx.OtherModuleName(module),
+						path:         path,
+						target:       module.Target(),
+						coverageFile: dep.CoverageOutputFile(),
 					})
 				} else {
 					ctx.ModuleErrorf("dependency %q missing output file", otherName)
@@ -638,6 +668,24 @@
 	return Bool(a.appProperties.Privileged)
 }
 
+func (a *AndroidApp) IsNativeCoverageNeeded(ctx android.BaseModuleContext) bool {
+	return ctx.Device() && (ctx.DeviceConfig().NativeCoverageEnabled() || ctx.DeviceConfig().ClangCoverageEnabled())
+}
+
+func (a *AndroidApp) PreventInstall() {
+	a.appProperties.PreventInstall = true
+}
+
+func (a *AndroidApp) HideFromMake() {
+	a.appProperties.HideFromMake = true
+}
+
+func (a *AndroidApp) MarkAsCoverageVariant(coverage bool) {
+	a.appProperties.IsCoverageVariant = coverage
+}
+
+var _ cc.Coverage = (*AndroidApp)(nil)
+
 // android_app compiles sources and Android resources into an Android application package `.apk` file.
 func AndroidAppFactory() android.Module {
 	module := &AndroidApp{}
@@ -1129,7 +1177,7 @@
 		}
 		a.certificate = certificates[0]
 		signed := android.PathForModuleOut(ctx, "signed", ctx.ModuleName()+".apk")
-		SignAppPackage(ctx, signed, dexOutput, certificates)
+		SignAppPackage(ctx, signed, dexOutput, certificates, nil)
 		a.outputFile = signed
 	} else {
 		alignedApk := android.PathForModuleOut(ctx, "zip-aligned", ctx.ModuleName()+".apk")
@@ -1334,7 +1382,7 @@
 	_, 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)
+	SignAppPackage(ctx, signed, r.aapt.exportPackage, certificates, nil)
 	r.certificate = certificates[0]
 
 	r.outputFile = signed
diff --git a/java/app_builder.go b/java/app_builder.go
index 5e7fbe6..b2780bc 100644
--- a/java/app_builder.go
+++ b/java/app_builder.go
@@ -45,7 +45,7 @@
 	})
 
 func CreateAndSignAppPackage(ctx android.ModuleContext, outputFile android.WritablePath,
-	packageFile, jniJarFile, dexJarFile android.Path, certificates []Certificate, deps android.Paths) {
+	packageFile, jniJarFile, dexJarFile android.Path, certificates []Certificate, deps android.Paths, v4SignatureFile android.WritablePath) {
 
 	unsignedApkName := strings.TrimSuffix(outputFile.Base(), ".apk") + "-unsigned.apk"
 	unsignedApk := android.PathForModuleOut(ctx, unsignedApkName)
@@ -66,10 +66,10 @@
 		Implicits: deps,
 	})
 
-	SignAppPackage(ctx, outputFile, unsignedApk, certificates)
+	SignAppPackage(ctx, outputFile, unsignedApk, certificates, v4SignatureFile)
 }
 
-func SignAppPackage(ctx android.ModuleContext, signedApk android.WritablePath, unsignedApk android.Path, certificates []Certificate) {
+func SignAppPackage(ctx android.ModuleContext, signedApk android.WritablePath, unsignedApk android.Path, certificates []Certificate, v4SignatureFile android.WritablePath) {
 
 	var certificateArgs []string
 	var deps android.Paths
@@ -78,14 +78,22 @@
 		deps = append(deps, c.Pem, c.Key)
 	}
 
+	outputFiles := android.WritablePaths{signedApk}
+	var flag string = ""
+	if v4SignatureFile != nil {
+		outputFiles = append(outputFiles, v4SignatureFile)
+		flag = "--enable-v4"
+	}
+
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        Signapk,
 		Description: "signapk",
-		Output:      signedApk,
+		Outputs:     outputFiles,
 		Input:       unsignedApk,
 		Implicits:   deps,
 		Args: map[string]string{
 			"certificates": strings.Join(certificateArgs, " "),
+			"flags":        flag,
 		},
 	})
 }
diff --git a/java/app_test.go b/java/app_test.go
index fa18e9d..f2ec483 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -1079,6 +1079,66 @@
 	}
 }
 
+func TestRequestV4SigningFlag(t *testing.T) {
+	testCases := []struct {
+		name     string
+		bp       string
+		expected string
+	}{
+		{
+			name: "default",
+			bp: `
+				android_app {
+					name: "foo",
+					srcs: ["a.java"],
+					sdk_version: "current",
+				}
+			`,
+			expected: "",
+		},
+		{
+			name: "default",
+			bp: `
+				android_app {
+					name: "foo",
+					srcs: ["a.java"],
+					sdk_version: "current",
+					v4_signature: false,
+				}
+			`,
+			expected: "",
+		},
+		{
+			name: "module certificate property",
+			bp: `
+				android_app {
+					name: "foo",
+					srcs: ["a.java"],
+					sdk_version: "current",
+					v4_signature: true,
+				}
+			`,
+			expected: "--enable-v4",
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.name, func(t *testing.T) {
+			config := testAppConfig(nil, test.bp, nil)
+			ctx := testContext()
+
+			run(t, ctx, config)
+			foo := ctx.ModuleForTests("foo", "android_common")
+
+			signapk := foo.Output("foo.apk")
+			signFlags := signapk.Args["flags"]
+			if test.expected != signFlags {
+				t.Errorf("Incorrect signing flags, expected: %q, got: %q", test.expected, signFlags)
+			}
+		})
+	}
+}
+
 func TestPackageNameOverride(t *testing.T) {
 	testCases := []struct {
 		name                string
diff --git a/java/dexpreopt.go b/java/dexpreopt.go
index 40cfe4f..fba0b97 100644
--- a/java/dexpreopt.go
+++ b/java/dexpreopt.go
@@ -127,7 +127,8 @@
 	global := dexpreopt.GetGlobalConfig(ctx)
 	bootImage := defaultBootImageConfig(ctx)
 	dexFiles := bootImage.dexPathsDeps.Paths()
-	dexLocations := bootImage.dexLocationsDeps
+	// The dex locations for all Android variants are identical.
+	dexLocations := bootImage.getAnyAndroidVariant().dexLocationsDeps
 	if global.UseArtImage {
 		bootImage = artBootImageConfig(ctx)
 	}
@@ -155,6 +156,8 @@
 		images = append(images, variant.images)
 		imagesDeps = append(imagesDeps, variant.imagesDeps)
 	}
+	// The image locations for all Android variants are identical.
+	imageLocations := bootImage.getAnyAndroidVariant().imageLocations()
 
 	dexLocation := android.InstallPathToOnDevicePath(ctx, d.installPath)
 
@@ -198,7 +201,7 @@
 		Archs:                   archs,
 		DexPreoptImages:         images,
 		DexPreoptImagesDeps:     imagesDeps,
-		DexPreoptImageLocations: bootImage.imageLocations,
+		DexPreoptImageLocations: imageLocations,
 
 		PreoptBootClassPathDexFiles:     dexFiles,
 		PreoptBootClassPathDexLocations: dexLocations,
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index a3b264e..543b233 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -16,6 +16,7 @@
 
 import (
 	"path/filepath"
+	"sort"
 	"strings"
 
 	"android/soong/android"
@@ -25,31 +26,13 @@
 )
 
 func init() {
-	android.RegisterSingletonType("dex_bootjars", dexpreoptBootJarsFactory)
+	RegisterDexpreoptBootJarsComponents(android.InitRegistrationContext)
 }
 
-// The image "location" is a symbolic path that with multiarchitecture
-// support doesn't really exist on the device. Typically it is
-// /system/framework/boot.art and should be the same for all supported
-// architectures on the device. The concrete architecture specific
-// content actually ends up in a "filename" that contains an
-// architecture specific directory name such as arm, arm64, x86, x86_64.
-//
-// Here are some example values for an x86_64 / x86 configuration:
-//
-// bootImages["x86_64"] = "out/soong/generic_x86_64/dex_bootjars/system/framework/x86_64/boot.art"
-// dexpreopt.PathToLocation(bootImages["x86_64"], "x86_64") = "out/soong/generic_x86_64/dex_bootjars/system/framework/boot.art"
-//
-// bootImages["x86"] = "out/soong/generic_x86_64/dex_bootjars/system/framework/x86/boot.art"
-// dexpreopt.PathToLocation(bootImages["x86"])= "out/soong/generic_x86_64/dex_bootjars/system/framework/boot.art"
-//
-// 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
+	// If this image is an extension, the image that it extends.
+	extends *bootImageConfig
 
 	// Image name (used in directory names and ninja rule names).
 	name string
@@ -69,17 +52,10 @@
 	// The names of jars that constitute this image.
 	modules []string
 
-	// The "locations" of jars.
-	dexLocations     []string // for this image
-	dexLocationsDeps []string // for the dependency images and in this image
-
 	// File paths to jars.
 	dexPaths     android.WritablePaths // for this image
 	dexPathsDeps android.WritablePaths // for the dependency images and in this image
 
-	// The "locations" of the dependency images and in this image.
-	imageLocations []string
-
 	// File path to a zip archive with all image files (or nil, if not needed).
 	zip android.WritablePath
 
@@ -97,6 +73,10 @@
 	// Target for which the image is generated.
 	target android.Target
 
+	// The "locations" of jars.
+	dexLocations     []string // for this image
+	dexLocationsDeps []string // for the dependency images and in this image
+
 	// Paths to image files.
 	images     android.OutputPath  // first image file
 	imagesDeps android.OutputPaths // all files
@@ -119,13 +99,23 @@
 	return nil
 }
 
+// Return any (the first) variant which is for the device (as opposed to for the host)
+func (image bootImageConfig) getAnyAndroidVariant() *bootImageVariant {
+	for _, variant := range image.variants {
+		if variant.target.Os == android.Android {
+			return variant
+		}
+	}
+	return nil
+}
+
 func (image bootImageConfig) moduleName(idx int) string {
 	// Dexpreopt on the boot class path produces multiple files. The first dex file
 	// is converted into 'name'.art (to match the legacy assumption that 'name'.art
 	// exists), and the rest are converted to 'name'-<jar>.art.
 	m := image.modules[idx]
 	name := image.stem
-	if idx != 0 || image.extension {
+	if idx != 0 || image.extends != nil {
 		name += "-" + stemOf(m)
 	}
 	return name
@@ -150,6 +140,24 @@
 	return ret
 }
 
+// The image "location" is a symbolic path that, with multiarchitecture support, doesn't really
+// exist on the device. Typically it is /apex/com.android.art/javalib/boot.art and should be the
+// same for all supported architectures on the device. The concrete architecture specific files
+// actually end up in architecture-specific sub-directory such as arm, arm64, x86, or x86_64.
+//
+// For example a physical file
+// "/apex/com.android.art/javalib/x86/boot.art" has "image location"
+// "/apex/com.android.art/javalib/boot.art" (which is not an actual file).
+//
+// The location is passed as an argument to the ART tools like dex2oat instead of the real path.
+// ART tools will then reconstruct the architecture-specific real path.
+func (image *bootImageVariant) imageLocations() (imageLocations []string) {
+	if image.extends != nil {
+		imageLocations = image.extends.getVariant(image.target).imageLocations()
+	}
+	return append(imageLocations, dexpreopt.PathToLocation(image.images, image.target.Arch.ArchType))
+}
+
 func concat(lists ...[]string) []string {
 	var size int
 	for _, l := range lists {
@@ -166,6 +174,10 @@
 	return &dexpreoptBootJars{}
 }
 
+func RegisterDexpreoptBootJarsComponents(ctx android.RegistrationContext) {
+	ctx.RegisterSingletonType("dex_bootjars", dexpreoptBootJarsFactory)
+}
+
 func skipDexpreoptBootJars(ctx android.PathContext) bool {
 	if dexpreopt.GetGlobalConfig(ctx).DisablePreopt {
 		return true
@@ -234,16 +246,66 @@
 	dumpOatRules(ctx, d.defaultBootImage)
 }
 
+// Inspect this module to see if it contains a bootclasspath dex jar.
+// Note that the same jar may occur in multiple modules.
+// This logic is tested in the apex package to avoid import cycle apex <-> java.
+func getBootImageJar(ctx android.SingletonContext, image *bootImageConfig, module android.Module) (int, android.Path) {
+	// All apex Java libraries have non-installable platform variants, skip them.
+	if module.IsSkipInstall() {
+		return -1, nil
+	}
+
+	jar, hasJar := module.(interface{ DexJar() android.Path })
+	if !hasJar {
+		return -1, nil
+	}
+
+	name := ctx.ModuleName(module)
+	index := android.IndexList(name, image.modules)
+	if index == -1 {
+		return -1, nil
+	}
+
+	// Check that this module satisfies constraints for a particular boot image.
+	apex, isApexModule := module.(android.ApexModule)
+	if image.name == artBootImageName {
+		if isApexModule && strings.HasPrefix(apex.ApexName(), "com.android.art.") {
+			// ok, found the jar in the ART apex
+		} else if isApexModule && !apex.IsForPlatform() {
+			// this jar is part of an updatable apex other than ART, fail immediately
+			ctx.Errorf("module '%s' from updatable apex '%s' is not allowed in the ART boot image", name, apex.ApexName())
+		} else if isApexModule && apex.IsForPlatform() && Bool(module.(*Library).deviceProperties.Hostdex) {
+			// this is a special "hostdex" variant, skip it and resume search
+			return -1, nil
+		} else if name == "jacocoagent" && ctx.Config().IsEnvTrue("EMMA_INSTRUMENT_FRAMEWORK") {
+			// this is Jacoco platform variant for a coverage build, skip it and resume search
+			return -1, nil
+		} else {
+			// this (installable) jar is part of the platform, fail immediately
+			ctx.Errorf("module '%s' is part of the platform and not allowed in the ART boot image", name)
+		}
+	} else if image.name == frameworkBootImageName {
+		if !isApexModule || apex.IsForPlatform() {
+			// ok, this jar is part of the platform
+		} else {
+			// this jar is part of an updatable apex, fail immediately
+			ctx.Errorf("module '%s' from updatable apex '%s' is not allowed in the framework boot image", name, apex.ApexName())
+		}
+	} else {
+		panic("unknown boot image: " + image.name)
+	}
+
+	return index, jar.DexJar()
+}
+
 // buildBootImage takes a bootImageConfig, creates rules to build it, and returns the image.
 func buildBootImage(ctx android.SingletonContext, image *bootImageConfig) *bootImageConfig {
+	// Collect dex jar paths for the boot image modules.
+	// This logic is tested in the apex package to avoid import cycle apex <-> java.
 	bootDexJars := make(android.Paths, len(image.modules))
 	ctx.VisitAllModules(func(module android.Module) {
-		// Collect dex jar paths for the modules listed above.
-		if j, ok := module.(interface{ DexJar() android.Path }); ok {
-			name := ctx.ModuleName(module)
-			if i := android.IndexList(name, image.modules); i != -1 {
-				bootDexJars[i] = j.DexJar()
-			}
+		if i, j := getBootImageJar(ctx, image, module); i != -1 {
+			bootDexJars[i] = j
 		}
 	})
 
@@ -255,7 +317,8 @@
 				missingDeps = append(missingDeps, image.modules[i])
 				bootDexJars[i] = android.PathForOutput(ctx, "missing")
 			} else {
-				ctx.Errorf("failed to find dex jar path for module %q",
+				ctx.Errorf("failed to find a dex jar path for module '%s'"+
+					", note that some jars may be filtered out by module constraints",
 					image.modules[i])
 			}
 		}
@@ -274,6 +337,7 @@
 
 	profile := bootImageProfileRule(ctx, image, missingDeps)
 	bootFrameworkProfileRule(ctx, image, missingDeps)
+	updatableBcpPackagesRule(ctx, image, missingDeps)
 
 	var allFiles android.Paths
 	for _, variant := range image.variants {
@@ -351,7 +415,7 @@
 		cmd.FlagWithInput("--dirty-image-objects=", global.DirtyImageObjects.Path())
 	}
 
-	if image.extension {
+	if image.extends != nil {
 		artImage := image.primaryImages
 		cmd.
 			Flag("--runtime-arg").FlagWithInputList("-Xbootclasspath:", image.dexPathsDeps.Paths(), ":").
@@ -478,7 +542,7 @@
 			Tool(globalSoong.Profman).
 			FlagWithInput("--create-profile-from=", bootImageProfile).
 			FlagForEachInput("--apk=", image.dexPathsDeps.Paths()).
-			FlagForEachArg("--dex-location=", image.dexLocationsDeps).
+			FlagForEachArg("--dex-location=", image.getAnyAndroidVariant().dexLocationsDeps).
 			FlagWithOutput("--reference-profile-file=", profile)
 
 		rule.Install(profile, "/system/etc/boot-image.prof")
@@ -529,7 +593,7 @@
 			Flag("--generate-boot-profile").
 			FlagWithInput("--create-profile-from=", bootFrameworkProfile).
 			FlagForEachInput("--apk=", image.dexPathsDeps.Paths()).
-			FlagForEachArg("--dex-location=", image.dexLocationsDeps).
+			FlagForEachArg("--dex-location=", image.getAnyAndroidVariant().dexLocationsDeps).
 			FlagWithOutput("--reference-profile-file=", profile)
 
 		rule.Install(profile, "/system/etc/boot-image.bprof")
@@ -542,6 +606,61 @@
 
 var bootFrameworkProfileRuleKey = android.NewOnceKey("bootFrameworkProfileRule")
 
+func updatableBcpPackagesRule(ctx android.SingletonContext, image *bootImageConfig, missingDeps []string) android.WritablePath {
+	if ctx.Config().IsPdkBuild() || ctx.Config().UnbundledBuild() {
+		return nil
+	}
+
+	return ctx.Config().Once(updatableBcpPackagesRuleKey, func() interface{} {
+		global := dexpreopt.GetGlobalConfig(ctx)
+		updatableModules := dexpreopt.GetJarsFromApexJarPairs(global.UpdatableBootJars)
+
+		// Collect `permitted_packages` for updatable boot jars.
+		var updatablePackages []string
+		ctx.VisitAllModules(func(module android.Module) {
+			if j, ok := module.(*Library); ok {
+				name := ctx.ModuleName(module)
+				if i := android.IndexList(name, updatableModules); i != -1 {
+					pp := j.properties.Permitted_packages
+					if len(pp) > 0 {
+						updatablePackages = append(updatablePackages, pp...)
+					} else {
+						ctx.Errorf("Missing permitted_packages for %s", name)
+					}
+					// Do not match the same library repeatedly.
+					updatableModules = append(updatableModules[:i], updatableModules[i+1:]...)
+				}
+			}
+		})
+
+		// Sort updatable packages to ensure deterministic ordering.
+		sort.Strings(updatablePackages)
+
+		updatableBcpPackagesName := "updatable-bcp-packages.txt"
+		updatableBcpPackages := image.dir.Join(ctx, updatableBcpPackagesName)
+
+		ctx.Build(pctx, android.BuildParams{
+			Rule:   android.WriteFile,
+			Output: updatableBcpPackages,
+			Args: map[string]string{
+				// WriteFile automatically adds the last end-of-line.
+				"content": strings.Join(updatablePackages, "\\n"),
+			},
+		})
+
+		rule := android.NewRuleBuilder()
+		rule.MissingDeps(missingDeps)
+		rule.Install(updatableBcpPackages, "/system/etc/"+updatableBcpPackagesName)
+		// TODO: Rename `profileInstalls` to `extraInstalls`?
+		// Maybe even move the field out of the bootImageConfig into some higher level type?
+		image.profileInstalls = append(image.profileInstalls, rule.Installs()...)
+
+		return updatableBcpPackages
+	}).(android.WritablePath)
+}
+
+var updatableBcpPackagesRuleKey = android.NewOnceKey("updatableBcpPackagesRule")
+
 func dumpOatRules(ctx android.SingletonContext, image *bootImageConfig) {
 	var allPhonies android.Paths
 	for _, image := range image.variants {
@@ -559,7 +678,7 @@
 			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.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-"+suffix, "dump oat boot "+arch.String())
@@ -573,10 +692,7 @@
 			Text("echo").FlagWithArg("Output in ", output.String())
 		rule.Build(pctx, ctx, "phony-dump-oat-boot-"+suffix, "dump oat boot "+arch.String())
 
-		// TODO: We need to make imageLocations per-variant to make oatdump work on host.
-		if image.target.Os == android.Android {
-			allPhonies = append(allPhonies, phony)
-		}
+		allPhonies = append(allPhonies, phony)
 	}
 
 	phony := android.PathForPhony(ctx, "dump-oat-boot")
@@ -612,25 +728,25 @@
 	if image != nil {
 		ctx.Strict("DEXPREOPT_IMAGE_PROFILE_BUILT_INSTALLED", image.profileInstalls.String())
 		ctx.Strict("DEXPREOPT_BOOTCLASSPATH_DEX_FILES", strings.Join(image.dexPathsDeps.Strings(), " "))
-		ctx.Strict("DEXPREOPT_BOOTCLASSPATH_DEX_LOCATIONS", strings.Join(image.dexLocationsDeps, " "))
+		ctx.Strict("DEXPREOPT_BOOTCLASSPATH_DEX_LOCATIONS", strings.Join(image.getAnyAndroidVariant().dexLocationsDeps, " "))
 
 		var imageNames []string
 		for _, current := range append(d.otherImages, image) {
 			imageNames = append(imageNames, current.name)
-			for _, current := range current.variants {
+			for _, variant := range current.variants {
 				suffix := ""
-				if current.target.Os.Class == android.Host {
+				if variant.target.Os.Class == android.Host {
 					suffix = "_host"
 				}
-				sfx := current.name + suffix + "_" + 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())
+				sfx := variant.name + suffix + "_" + variant.target.Arch.ArchType.String()
+				ctx.Strict("DEXPREOPT_IMAGE_VDEX_BUILT_INSTALLED_"+sfx, variant.vdexInstalls.String())
+				ctx.Strict("DEXPREOPT_IMAGE_"+sfx, variant.images.String())
+				ctx.Strict("DEXPREOPT_IMAGE_DEPS_"+sfx, strings.Join(variant.imagesDeps.Strings(), " "))
+				ctx.Strict("DEXPREOPT_IMAGE_BUILT_INSTALLED_"+sfx, variant.installs.String())
+				ctx.Strict("DEXPREOPT_IMAGE_UNSTRIPPED_BUILT_INSTALLED_"+sfx, variant.unstrippedInstalls.String())
 			}
-
-			ctx.Strict("DEXPREOPT_IMAGE_LOCATIONS_"+current.name, strings.Join(current.imageLocations, ":"))
+			imageLocations := current.getAnyAndroidVariant().imageLocations()
+			ctx.Strict("DEXPREOPT_IMAGE_LOCATIONS_"+current.name, strings.Join(imageLocations, ":"))
 			ctx.Strict("DEXPREOPT_IMAGE_ZIP_"+current.name, current.zip.String())
 		}
 		ctx.Strict("DEXPREOPT_IMAGE_NAMES", strings.Join(imageNames, " "))
diff --git a/java/dexpreopt_bootjars_test.go b/java/dexpreopt_bootjars_test.go
index 94ca8bb..127c201 100644
--- a/java/dexpreopt_bootjars_test.go
+++ b/java/dexpreopt_bootjars_test.go
@@ -53,7 +53,7 @@
 
 	ctx := testContext()
 
-	ctx.RegisterSingletonType("dex_bootjars", dexpreoptBootJarsFactory)
+	RegisterDexpreoptBootJarsComponents(ctx)
 
 	run(t, ctx, config)
 
diff --git a/java/dexpreopt_config.go b/java/dexpreopt_config.go
index ffce2a9..066694c 100644
--- a/java/dexpreopt_config.go
+++ b/java/dexpreopt_config.go
@@ -79,6 +79,14 @@
 	return moduleName
 }
 
+func getDexLocation(ctx android.PathContext, target android.Target, subdir string, name string) string {
+	if target.Os.Class == android.Host {
+		return filepath.Join(ctx.Config().Getenv("OUT_DIR"), "host", ctx.Config().PrebuiltOS(), subdir, name)
+	} else {
+		return filepath.Join("/", subdir, name)
+	}
+}
+
 var (
 	bootImageConfigKey     = android.NewOnceKey("bootImageConfig")
 	artBootImageName       = "art"
@@ -104,36 +112,23 @@
 		artSubdir := "apex/com.android.art/javalib"
 		frameworkSubdir := "system/framework"
 
-		var artLocations, frameworkLocations []string
-		for _, m := range artModules {
-			artLocations = append(artLocations, filepath.Join("/"+artSubdir, stemOf(m)+".jar"))
-		}
-		for _, m := range frameworkModules {
-			frameworkLocations = append(frameworkLocations, filepath.Join("/"+frameworkSubdir, stemOf(m)+".jar"))
-		}
-
 		// ART config for the primary boot image in the ART apex.
 		// It includes the Core Libraries.
 		artCfg := bootImageConfig{
-			extension:        false,
-			name:             artBootImageName,
-			stem:             "boot",
-			installSubdir:    artSubdir,
-			modules:          artModules,
-			dexLocations:     artLocations,
-			dexLocationsDeps: artLocations,
+			name:          artBootImageName,
+			stem:          "boot",
+			installSubdir: artSubdir,
+			modules:       artModules,
 		}
 
 		// Framework config for the boot image extension.
 		// It includes framework libraries and depends on the ART config.
 		frameworkCfg := bootImageConfig{
-			extension:        true,
-			name:             frameworkBootImageName,
-			stem:             "boot",
-			installSubdir:    frameworkSubdir,
-			modules:          frameworkModules,
-			dexLocations:     frameworkLocations,
-			dexLocationsDeps: append(artLocations, frameworkLocations...),
+			extends:       &artCfg,
+			name:          frameworkBootImageName,
+			stem:          "boot",
+			installSubdir: frameworkSubdir,
+			modules:       frameworkModules,
 		}
 
 		configs := map[string]*bootImageConfig{
@@ -149,8 +144,6 @@
 			// expands to <stem>.art for primary image and <stem>-<1st module>.art for extension
 			imageName := c.firstModuleNameOrStem() + ".art"
 
-			c.imageLocations = []string{c.dir.Join(ctx, "android", c.installSubdir, imageName).String()}
-
 			// The path to bootclasspath dex files needs to be known at module
 			// GenerateAndroidBuildAction time, before the bootclasspath modules have been compiled.
 			// Set up known paths for them, the singleton rules will copy them there.
@@ -171,6 +164,10 @@
 					images:          imageDir.Join(ctx, imageName),
 					imagesDeps:      c.moduleFiles(ctx, imageDir, ".art", ".oat", ".vdex"),
 				}
+				for _, m := range c.modules {
+					variant.dexLocations = append(variant.dexLocations, getDexLocation(ctx, target, c.installSubdir, stemOf(m)+".jar"))
+				}
+				variant.dexLocationsDeps = variant.dexLocations
 				c.variants = append(c.variants, variant)
 			}
 
@@ -181,8 +178,8 @@
 		frameworkCfg.dexPathsDeps = append(artCfg.dexPathsDeps, frameworkCfg.dexPathsDeps...)
 		for i := range targets {
 			frameworkCfg.variants[i].primaryImages = artCfg.variants[i].images
+			frameworkCfg.variants[i].dexLocationsDeps = append(artCfg.variants[i].dexLocations, frameworkCfg.variants[i].dexLocationsDeps...)
 		}
-		frameworkCfg.imageLocations = append(artCfg.imageLocations, frameworkCfg.imageLocations...)
 
 		return configs
 	}).(map[string]*bootImageConfig)
@@ -206,7 +203,7 @@
 			updatableBootclasspath[i] = dexpreopt.GetJarLocationFromApexJarPair(p)
 		}
 
-		bootclasspath := append(copyOf(image.dexLocationsDeps), updatableBootclasspath...)
+		bootclasspath := append(copyOf(image.getAnyAndroidVariant().dexLocationsDeps), updatableBootclasspath...)
 		return bootclasspath
 	})
 }
@@ -221,7 +218,7 @@
 
 func dexpreoptConfigMakevars(ctx android.MakeVarsContext) {
 	ctx.Strict("PRODUCT_BOOTCLASSPATH", strings.Join(defaultBootclasspath(ctx), ":"))
-	ctx.Strict("PRODUCT_DEX2OAT_BOOTCLASSPATH", strings.Join(defaultBootImageConfig(ctx).dexLocationsDeps, ":"))
+	ctx.Strict("PRODUCT_DEX2OAT_BOOTCLASSPATH", strings.Join(defaultBootImageConfig(ctx).getAnyAndroidVariant().dexLocationsDeps, ":"))
 	ctx.Strict("PRODUCT_SYSTEM_SERVER_CLASSPATH", strings.Join(systemServerClasspath(ctx), ":"))
 
 	ctx.Strict("DEXPREOPT_BOOT_JARS_MODULES", strings.Join(defaultBootImageConfig(ctx).modules, ":"))
diff --git a/java/hiddenapi_singleton.go b/java/hiddenapi_singleton.go
index 7e7e955..c7f7cbd 100644
--- a/java/hiddenapi_singleton.go
+++ b/java/hiddenapi_singleton.go
@@ -211,23 +211,30 @@
 // the greylists.
 func flagsRule(ctx android.SingletonContext) android.Path {
 	var flagsCSV android.Paths
-
-	var greylistIgnoreConflicts android.Path
+	var greylistRemovedApis android.Paths
 
 	ctx.VisitAllModules(func(module android.Module) {
 		if h, ok := module.(hiddenAPIIntf); ok {
 			if csv := h.flagsCSV(); csv != nil {
 				flagsCSV = append(flagsCSV, csv)
 			}
-		} else if ds, ok := module.(*Droidstubs); ok && ctx.ModuleName(module) == "hiddenapi-lists-docs" {
-			greylistIgnoreConflicts = ds.removedDexApiFile
+		} else if ds, ok := module.(*Droidstubs); ok {
+			// Track @removed public and system APIs via corresponding droidstubs targets.
+			// These APIs are not present in the stubs, however, we have to keep allowing access
+			// to them at runtime.
+			if m := ctx.ModuleName(module); m == "api-stubs-docs" || m == "system-api-stubs-docs" {
+				greylistRemovedApis = append(greylistRemovedApis, ds.removedDexApiFile)
+			}
 		}
 	})
 
-	if greylistIgnoreConflicts == nil {
-		ctx.Errorf("failed to find removed_dex_api_filename from hiddenapi-lists-docs module")
-		return nil
-	}
+	combinedRemovedApis := android.PathForOutput(ctx, "hiddenapi", "combined-removed-dex.txt")
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        android.Cat,
+		Inputs:      greylistRemovedApis,
+		Output:      combinedRemovedApis,
+		Description: "Combine removed apis for " + combinedRemovedApis.String(),
+	})
 
 	rule := android.NewRuleBuilder()
 
@@ -242,8 +249,7 @@
 		Inputs(flagsCSV).
 		FlagWithInput("--greylist ",
 			android.PathForSource(ctx, "frameworks/base/config/hiddenapi-greylist.txt")).
-		FlagWithInput("--greylist-ignore-conflicts ",
-			greylistIgnoreConflicts).
+		FlagWithInput("--greylist-ignore-conflicts ", combinedRemovedApis).
 		FlagWithInput("--greylist-max-q ",
 			android.PathForSource(ctx, "frameworks/base/config/hiddenapi-greylist-max-q.txt")).
 		FlagWithInput("--greylist-max-p ",
diff --git a/java/java.go b/java/java.go
index 22d14ec..a8ca3ff 100644
--- a/java/java.go
+++ b/java/java.go
@@ -325,6 +325,10 @@
 
 	UncompressDex bool `blueprint:"mutated"`
 	IsSDKLibrary  bool `blueprint:"mutated"`
+
+	// If true, generate the signature file of APK Signing Scheme V4, along side the signed APK file.
+	// Defaults to false.
+	V4_signature *bool
 }
 
 func (me *CompilerDeviceProperties) EffectiveOptimizeEnabled() bool {
@@ -421,6 +425,8 @@
 
 	// list of the xref extraction files
 	kytheFiles android.Paths
+
+	distFile android.Path
 }
 
 func (j *Module) OutputFiles(tag string) (android.Paths, error) {
@@ -540,9 +546,10 @@
 }
 
 type jniLib struct {
-	name   string
-	path   android.Path
-	target android.Target
+	name         string
+	path         android.Path
+	target       android.Target
+	coverageFile android.OptionalPath
 }
 
 func (j *Module) shouldInstrument(ctx android.BaseModuleContext) bool {
@@ -800,7 +807,7 @@
 		return javaModule, true
 	case ver.kind == sdkModule:
 		return javaModule, false
-	case name == "services-stubs":
+	case name == "android_system_server_stubs_current":
 		return javaSystemServer, true
 	case ver.kind == sdkSystemServer:
 		return javaSystemServer, false
@@ -1753,11 +1760,6 @@
 	if staticLibTag == ctx.OtherModuleDependencyTag(dep) {
 		return true
 	}
-	// Also, a dependency to an sdk member is also considered as such. This is required because
-	// sdk members should be mutated into APEXes. Refer to sdk.sdkDepsReplaceMutator.
-	if sa, ok := dep.(android.SdkAware); ok && sa.IsInAnySdk() {
-		return true
-	}
 	return false
 }
 
@@ -1777,9 +1779,18 @@
 // Java libraries (.jar file)
 //
 
+type LibraryProperties struct {
+	Dist struct {
+		// The tag of the output of this module that should be output.
+		Tag *string `android:"arch_variant"`
+	} `android:"arch_variant"`
+}
+
 type Library struct {
 	Module
 
+	libraryProperties LibraryProperties
+
 	InstallMixin func(ctx android.ModuleContext, installPath android.Path) (extraInstallDeps android.Paths)
 }
 
@@ -1823,6 +1834,15 @@
 		j.installFile = ctx.InstallFile(android.PathForModuleInstall(ctx, "framework"),
 			ctx.ModuleName()+".jar", j.outputFile, extraInstallDeps...)
 	}
+
+	// Verify Dist.Tag is set to a supported output
+	if j.libraryProperties.Dist.Tag != nil {
+		distFiles, err := j.OutputFiles(*j.libraryProperties.Dist.Tag)
+		if err != nil {
+			ctx.PropertyErrorf("dist.tag", "%s", err.Error())
+		}
+		j.distFile = distFiles[0]
+	}
 }
 
 func (j *Library) DepsMutator(ctx android.BottomUpMutatorContext) {
@@ -1943,7 +1963,8 @@
 		&module.Module.properties,
 		&module.Module.deviceProperties,
 		&module.Module.dexpreoptProperties,
-		&module.Module.protoProperties)
+		&module.Module.protoProperties,
+		&module.libraryProperties)
 
 	android.InitApexModule(module)
 	android.InitSdkAwareModule(module)
@@ -2338,6 +2359,12 @@
 
 	// set the name of the output
 	Stem *string
+
+	Aidl struct {
+		// directories that should be added as include directories for any aidl sources of modules
+		// that depend on this module, as well as to aidl for this module.
+		Export_include_dirs []string
+	}
 }
 
 type Import struct {
@@ -2351,6 +2378,7 @@
 
 	combinedClasspathFile android.Path
 	exportedSdkLibs       []string
+	exportAidlIncludeDirs android.Paths
 }
 
 func (j *Import) sdkVersion() sdkSpec {
@@ -2424,6 +2452,8 @@
 		ctx.InstallFile(android.PathForModuleInstall(ctx, "framework"),
 			jarName, outputFile)
 	}
+
+	j.exportAidlIncludeDirs = android.PathsForModuleSrc(ctx, j.properties.Aidl.Export_include_dirs)
 }
 
 var _ Dependency = (*Import)(nil)
@@ -2458,7 +2488,7 @@
 }
 
 func (j *Import) AidlIncludeDirs() android.Paths {
-	return nil
+	return j.exportAidlIncludeDirs
 }
 
 func (j *Import) ExportedSdkLibs() []string {
@@ -2478,11 +2508,6 @@
 	if staticLibTag == ctx.OtherModuleDependencyTag(dep) {
 		return true
 	}
-	// Also, a dependency to an sdk member is also considered as such. This is required because
-	// sdk members should be mutated into APEXes. Refer to sdk.sdkDepsReplaceMutator.
-	if sa, ok := dep.(android.SdkAware); ok && sa.IsInAnySdk() {
-		return true
-	}
 	return false
 }
 
diff --git a/java/java_test.go b/java/java_test.go
index 6d972be..e8a1a7c 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -1491,3 +1491,27 @@
 		t.Errorf("bootclasspath of %q must start with --system and end with %q, but was %#v.", moduleName, expectedSuffix, bootClasspath)
 	}
 }
+
+func TestAidlExportIncludeDirsFromImports(t *testing.T) {
+	ctx, _ := testJava(t, `
+		java_library {
+			name: "foo",
+			srcs: ["aidl/foo/IFoo.aidl"],
+			libs: ["bar"],
+		}
+
+		java_import {
+			name: "bar",
+			jars: ["a.jar"],
+			aidl: {
+				export_include_dirs: ["aidl/bar"],
+			},
+		}
+	`)
+
+	aidlCommand := ctx.ModuleForTests("foo", "android_common").Rule("aidl").RuleParams.Command
+	expectedAidlFlag := "-Iaidl/bar"
+	if !strings.Contains(aidlCommand, expectedAidlFlag) {
+		t.Errorf("aidl command %q does not contain %q", aidlCommand, expectedAidlFlag)
+	}
+}
diff --git a/java/sdk.go b/java/sdk.go
index ded2a06..0e132d3 100644
--- a/java/sdk.go
+++ b/java/sdk.go
@@ -406,7 +406,7 @@
 		return toModule([]string{"android_module_lib_stubs_current"}, "framework-res", sdkFrameworkAidlPath(ctx))
 	case sdkSystemServer:
 		// TODO(146757305): provide .apk and .aidl that have more APIs for modules
-		return toModule([]string{"android_module_lib_stubs_current", "services-stubs"}, "framework-res", sdkFrameworkAidlPath(ctx))
+		return toModule([]string{"android_system_server_stubs_current"}, "framework-res", sdkFrameworkAidlPath(ctx))
 	default:
 		panic(fmt.Errorf("invalid sdk %q", sdkVersion.raw))
 	}
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 6921114..efee7da 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -18,7 +18,6 @@
 	"android/soong/android"
 
 	"fmt"
-	"io"
 	"path"
 	"path/filepath"
 	"sort"
@@ -87,6 +86,9 @@
 	// *current. Older stubs library built with a numbered SDK version is created from
 	// the prebuilt jar.
 	sdkVersion string
+
+	// Extra arguments to pass to droidstubs for this scope.
+	droidstubsArgs []string
 }
 
 // Initialize a scope, creating and adding appropriate dependency tags
@@ -132,6 +134,7 @@
 		moduleSuffix:              sdkSystemApiSuffix,
 		apiFileMakeVariableSuffix: "_SYSTEM",
 		sdkVersion:                "system_current",
+		droidstubsArgs:            []string{"-showAnnotation android.annotation.SystemApi"},
 	})
 	apiScopeTest = initApiScope(&apiScope{
 		name:                      "test",
@@ -139,6 +142,7 @@
 		moduleSuffix:              sdkTestApiSuffix,
 		apiFileMakeVariableSuffix: "_TEST",
 		sdkVersion:                "test_current",
+		droidstubsArgs:            []string{"-showAnnotation android.annotation.TestApi"},
 	})
 	allApiScopes = apiScopes{
 		apiScopePublic,
@@ -328,41 +332,6 @@
 	entriesList := module.Library.AndroidMkEntries()
 	entries := &entriesList[0]
 	entries.Required = append(entries.Required, module.xmlFileName())
-
-	entries.ExtraFooters = []android.AndroidMkExtraFootersFunc{
-		func(w io.Writer, name, prefix, moduleDir string, entries *android.AndroidMkEntries) {
-			if !Bool(module.sdkLibraryProperties.No_dist) {
-				// Create a phony module that installs the impl library, for the case when this lib is
-				// in PRODUCT_PACKAGES.
-				owner := module.ModuleBase.Owner()
-				if owner == "" {
-					if Bool(module.sdkLibraryProperties.Core_lib) {
-						owner = "core"
-					} else {
-						owner = "android"
-					}
-				}
-
-				// Create dist rules to install the stubs libs and api files to the dist dir
-				for _, apiScope := range module.getActiveApiScopes() {
-					if scopePaths, ok := module.scopePaths[apiScope]; ok {
-						if len(scopePaths.stubsHeaderPath) == 1 {
-							fmt.Fprintln(w, "$(call dist-for-goals,sdk win_sdk,"+
-								scopePaths.stubsImplPath.Strings()[0]+
-								":"+path.Join("apistubs", owner, apiScope.name,
-								module.BaseModuleName()+".jar")+")")
-						}
-						if scopePaths.apiFilePath != nil {
-							fmt.Fprintln(w, "$(call dist-for-goals,sdk win_sdk,"+
-								scopePaths.apiFilePath.String()+
-								":"+path.Join("apistubs", owner, apiScope.name, "api",
-								module.BaseModuleName()+".txt")+")")
-						}
-					}
-				}
-			}
-		},
-	}
 	return entriesList
 }
 
@@ -386,6 +355,17 @@
 	return module.BaseModuleName() + sdkXmlFileSuffix
 }
 
+// The dist path of the stub artifacts
+func (module *SdkLibrary) apiDistPath(apiScope *apiScope) string {
+	if module.ModuleBase.Owner() != "" {
+		return path.Join("apistubs", module.ModuleBase.Owner(), apiScope.name)
+	} else if Bool(module.sdkLibraryProperties.Core_lib) {
+		return path.Join("apistubs", "core", apiScope.name)
+	} else {
+		return path.Join("apistubs", "android", apiScope.name)
+	}
+}
+
 // Get the sdk version for use when compiling the stubs library.
 func (module *SdkLibrary) sdkVersionForStubsLibrary(mctx android.LoadHookContext, apiScope *apiScope) string {
 	sdkDep := decodeSdkDep(mctx, sdkContext(&module.Library))
@@ -438,6 +418,12 @@
 			Srcs       []string
 			Javacflags []string
 		}
+		Dist struct {
+			Targets []string
+			Dest    *string
+			Dir     *string
+			Tag     *string
+		}
 	}{}
 
 	props.Name = proptools.StringPtr(module.stubsName(apiScope))
@@ -466,11 +452,18 @@
 	} else if module.SystemExtSpecific() {
 		props.System_ext_specific = proptools.BoolPtr(true)
 	}
+	// Dist the class jar artifact for sdk builds.
+	if !Bool(module.sdkLibraryProperties.No_dist) {
+		props.Dist.Targets = []string{"sdk", "win_sdk"}
+		props.Dist.Dest = proptools.StringPtr(fmt.Sprintf("%v.jar", module.BaseModuleName()))
+		props.Dist.Dir = proptools.StringPtr(module.apiDistPath(apiScope))
+		props.Dist.Tag = proptools.StringPtr(".jar")
+	}
 
 	mctx.CreateModule(LibraryFactory, &props)
 }
 
-// Creates a droiddoc module that creates stubs source files from the given full source
+// Creates a droidstubs module that creates stubs source files from the given full source
 // files
 func (module *SdkLibrary) createStubsSources(mctx android.LoadHookContext, apiScope *apiScope) {
 	props := struct {
@@ -497,6 +490,11 @@
 			Include_dirs       []string
 			Local_include_dirs []string
 		}
+		Dist struct {
+			Targets []string
+			Dest    *string
+			Dir     *string
+		}
 	}{}
 
 	sdkDep := decodeSdkDep(mctx, sdkContext(&module.Library))
@@ -523,15 +521,15 @@
 	props.Merge_annotations_dirs = module.sdkLibraryProperties.Merge_annotations_dirs
 	props.Merge_inclusion_annotations_dirs = module.sdkLibraryProperties.Merge_inclusion_annotations_dirs
 
-	droiddocArgs := []string{}
+	droidstubsArgs := []string{}
 	if len(module.sdkLibraryProperties.Api_packages) != 0 {
-		droiddocArgs = append(droiddocArgs, "--stub-packages "+strings.Join(module.sdkLibraryProperties.Api_packages, ":"))
+		droidstubsArgs = append(droidstubsArgs, "--stub-packages "+strings.Join(module.sdkLibraryProperties.Api_packages, ":"))
 	}
 	if len(module.sdkLibraryProperties.Hidden_api_packages) != 0 {
-		droiddocArgs = append(droiddocArgs,
+		droidstubsArgs = append(droidstubsArgs,
 			android.JoinWithPrefix(module.sdkLibraryProperties.Hidden_api_packages, " --hide-package "))
 	}
-	droiddocArgs = append(droiddocArgs, module.sdkLibraryProperties.Droiddoc_options...)
+	droidstubsArgs = append(droidstubsArgs, module.sdkLibraryProperties.Droiddoc_options...)
 	disabledWarnings := []string{
 		"MissingPermission",
 		"BroadcastBehavior",
@@ -543,16 +541,12 @@
 		"Todo",
 		"Typo",
 	}
-	droiddocArgs = append(droiddocArgs, android.JoinWithPrefix(disabledWarnings, "--hide "))
+	droidstubsArgs = append(droidstubsArgs, android.JoinWithPrefix(disabledWarnings, "--hide "))
 
-	switch apiScope {
-	case apiScopeSystem:
-		droiddocArgs = append(droiddocArgs, "-showAnnotation android.annotation.SystemApi")
-	case apiScopeTest:
-		droiddocArgs = append(droiddocArgs, " -showAnnotation android.annotation.TestApi")
-	}
+	// Add in scope specific arguments.
+	droidstubsArgs = append(droidstubsArgs, apiScope.droidstubsArgs...)
 	props.Arg_files = module.sdkLibraryProperties.Droiddoc_option_files
-	props.Args = proptools.StringPtr(strings.Join(droiddocArgs, " "))
+	props.Args = proptools.StringPtr(strings.Join(droidstubsArgs, " "))
 
 	// List of APIs identified from the provided source files are created. They are later
 	// compared against to the not-yet-released (a.k.a current) list of APIs and to the
@@ -578,6 +572,13 @@
 		module.latestRemovedApiFilegroupName(apiScope))
 	props.Check_api.Ignore_missing_latest_api = proptools.BoolPtr(true)
 
+	// Dist the api txt artifact for sdk builds.
+	if !Bool(module.sdkLibraryProperties.No_dist) {
+		props.Dist.Targets = []string{"sdk", "win_sdk"}
+		props.Dist.Dest = proptools.StringPtr(fmt.Sprintf("%v.txt", module.BaseModuleName()))
+		props.Dist.Dir = proptools.StringPtr(path.Join(module.apiDistPath(apiScope), "api"))
+	}
+
 	mctx.CreateModule(DroidstubsFactory, &props)
 }
 
diff --git a/java/sdk_test.go b/java/sdk_test.go
index ea6733d..088db9e 100644
--- a/java/sdk_test.go
+++ b/java/sdk_test.go
@@ -222,9 +222,9 @@
 		{
 			name:           "system_server_current",
 			properties:     `sdk_version: "system_server_current",`,
-			bootclasspath:  []string{"android_module_lib_stubs_current", "services-stubs", "core-lambda-stubs"},
+			bootclasspath:  []string{"android_system_server_stubs_current", "core-lambda-stubs"},
 			system:         "core-current-stubs-system-modules",
-			java9classpath: []string{"android_module_lib_stubs_current", "services-stubs"},
+			java9classpath: []string{"android_system_server_stubs_current"},
 			aidl:           "-p" + buildDir + "/framework.aidl",
 		},
 	}
diff --git a/java/testing.go b/java/testing.go
index 5b6a39b..6929bb7 100644
--- a/java/testing.go
+++ b/java/testing.go
@@ -50,6 +50,8 @@
 		"api/test-current.txt":   nil,
 		"api/test-removed.txt":   nil,
 		"framework/aidl/a.aidl":  nil,
+		"aidl/foo/IFoo.aidl":     nil,
+		"aidl/bar/IBar.aidl":     nil,
 		"assets_a/a":             nil,
 		"assets_b/b":             nil,
 
@@ -148,7 +150,7 @@
 		"android_system_stubs_current",
 		"android_test_stubs_current",
 		"android_module_lib_stubs_current",
-		"services-stubs",
+		"android_system_server_stubs_current",
 		"core.current.stubs",
 		"core.platform.api.stubs",
 		"kotlin-stdlib",
diff --git a/rust/compiler.go b/rust/compiler.go
index 4593165..81b258c 100644
--- a/rust/compiler.go
+++ b/rust/compiler.go
@@ -222,7 +222,10 @@
 	if ctx.toolchain().Is64Bit() && compiler.dir64 != "" {
 		dir = compiler.dir64
 	}
-	if !ctx.Host() || ctx.Target().NativeBridge == android.NativeBridgeEnabled {
+	if ctx.Target().NativeBridge == android.NativeBridgeEnabled {
+		dir = filepath.Join(dir, ctx.Target().NativeBridgeRelativePath)
+	}
+	if !ctx.Host() && ctx.Config().HasMultilibConflict(ctx.Arch().ArchType) {
 		dir = filepath.Join(dir, ctx.Arch().ArchType.String())
 	}
 	return android.PathForModuleInstall(ctx, dir, compiler.subDir,
diff --git a/rust/library.go b/rust/library.go
index 0cf2dd0..bf863bb 100644
--- a/rust/library.go
+++ b/rust/library.go
@@ -318,6 +318,8 @@
 
 	if ctx.toolchain().Bionic() && (library.dylib() || library.shared()) {
 		deps = library.baseCompiler.bionicDeps(ctx, deps)
+		deps.CrtBegin = "crtbegin_so"
+		deps.CrtEnd = "crtend_so"
 	}
 
 	return deps
diff --git a/scripts/OWNERS b/scripts/OWNERS
index 9e97a60..dd0966f 100644
--- a/scripts/OWNERS
+++ b/scripts/OWNERS
@@ -1,2 +1,3 @@
 per-file system-clang-format,system-clang-format-2 = enh@google.com,smoreland@google.com
 per-file build-mainline-modules.sh = ngeoffray@google.com,paulduffin@google.com,mast@google.com
+per-file build-aml-prebuilts.sh = ngeoffray@google.com,paulduffin@google.com,mast@google.com
diff --git a/scripts/build-aml-prebuilts.sh b/scripts/build-aml-prebuilts.sh
index 7e3a82c..35a6ff3 100755
--- a/scripts/build-aml-prebuilts.sh
+++ b/scripts/build-aml-prebuilts.sh
@@ -58,6 +58,7 @@
 
     "DeviceName": "generic_arm64",
     "HostArch": "x86_64",
+    "HostSecondaryArch": "x86",
     "Aml_abis": true,
 
     "UseGoma": ${USE_GOMA}
diff --git a/scripts/transitive-deps.sh b/scripts/transitive-deps.sh
index 23121c6..c6f8b76 100755
--- a/scripts/transitive-deps.sh
+++ b/scripts/transitive-deps.sh
@@ -469,7 +469,9 @@
     fi
     readonly hashedNotice="${tmpFiles}/hashednotices"
     ( # md5sum outputs checksum space indicator(space or *) filename newline
+        set +e
         sort -u "${allNotice}" | tr '\n' '\0' | xargs -0 -r md5sum 2>/dev/null
+        set -e
       # use sed to replace space and indicator with separator
     ) > "${hashedNotice}"
     if ${showProgress}; then
diff --git a/sdk/cc_sdk_test.go b/sdk/cc_sdk_test.go
index ca40afd..780da9f 100644
--- a/sdk/cc_sdk_test.go
+++ b/sdk/cc_sdk_test.go
@@ -32,6 +32,7 @@
 		"arm64/include/Arm64Test.h":     nil,
 		"libfoo.so":                     nil,
 		"aidl/foo/bar/Test.aidl":        nil,
+		"some/where/stubslib.map.txt":   nil,
 	}
 	return testSdkWithFs(t, bp, fs)
 }
@@ -48,7 +49,6 @@
 		cc_library_shared {
 			name: "sdkmember",
 			srcs: ["Test.cpp"],
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -178,13 +178,11 @@
 
 		cc_library_host_shared {
 			name: "sdkshared",
-			system_shared_libs: [],
 			stl: "none",
 		}
 
 		cc_library_host_static {
 			name: "sdkstatic",
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -201,25 +199,21 @@
 
 		cc_library_shared {
 			name: "sdkshared",
-			system_shared_libs: [],
 			stl: "none",
 		}
 
 		cc_library_static {
 			name: "sdkstatic",
-			system_shared_libs: [],
 			stl: "none",
 		}
 
 		cc_library {
 			name: "sdkboth1",
-			system_shared_libs: [],
 			stl: "none",
 		}
 
 		cc_library {
 			name: "sdkboth2",
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -295,7 +289,6 @@
 				"Test.cpp",
 			],
 			export_include_dirs: ["include"],
-			system_shared_libs: [],
 			stl: "none",
 		}
 
@@ -305,7 +298,6 @@
 				"Test.cpp",
 			],
 			export_include_dirs: ["include"],
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -342,7 +334,6 @@
 					export_system_include_dirs: ["arm64/include"],
 				},
 			},
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -410,7 +401,6 @@
 				"Test.cpp",
 			],
 			compile_multilib: "both",
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -485,7 +475,6 @@
 				"Test.cpp",
 			],
 			compile_multilib: "both",
-			system_shared_libs: [],
 			stl: "none",
 			target: {
 				windows: {
@@ -586,7 +575,6 @@
 			aidl: {
 				export_aidl_headers: true,
 			},
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -673,7 +661,6 @@
 			srcs: [
 				"Test.cpp",
 			],
-			system_shared_libs: [],
 			stl: "none",
 		}
 
@@ -714,7 +701,6 @@
 					},
 				},
 			},
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -864,7 +850,6 @@
 			aidl: {
 				export_aidl_headers: true,
 			},
-			system_shared_libs: [],
 			stl: "none",
 			sdk_version: "minimum",
 		}
@@ -960,7 +945,6 @@
 			srcs: [
 				"Test.cpp",
 			],
-			system_shared_libs: [],
 			stl: "none",
 			target: {
 				windows: {
@@ -1050,7 +1034,6 @@
 			aidl: {
 				export_aidl_headers: true,
 			},
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -1137,7 +1120,6 @@
 			aidl: {
 				export_aidl_headers: true,
 			},
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -1219,7 +1201,6 @@
 				"Test.cpp",
 			],
 			export_include_dirs: ["include"],
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -1322,7 +1303,6 @@
 			aidl: {
 				export_aidl_headers: true,
 			},
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -1393,7 +1373,6 @@
 		cc_library_headers {
 			name: "mynativeheaders",
 			export_include_dirs: ["include"],
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -1444,7 +1423,6 @@
 			device_supported: false,
 			host_supported: true,
 			export_include_dirs: ["include"],
-			system_shared_libs: [],
 			stl: "none",
 		}
 	`)
@@ -1498,7 +1476,6 @@
 		cc_library_headers {
 			name: "mynativeheaders",
 			host_supported: true,
-			system_shared_libs: [],
 			stl: "none",
 			export_system_include_dirs: ["include"],
 			target: {
@@ -1561,3 +1538,265 @@
 `),
 	)
 }
+
+func TestSystemSharedLibPropagation(t *testing.T) {
+	// b/145598135 - Generating host snapshots for anything other than linux is not supported.
+	SkipIfNotLinux(t)
+
+	result := testSdkWithCc(t, `
+		sdk {
+			name: "mysdk",
+			native_shared_libs: ["sslnil", "sslempty", "sslnonempty"],
+		}
+
+		cc_library {
+			name: "sslnil",
+			host_supported: true,
+		}
+
+		cc_library {
+			name: "sslempty",
+			system_shared_libs: [],
+		}
+
+		cc_library {
+			name: "sslnonempty",
+			system_shared_libs: ["sslnil"],
+		}
+	`)
+
+	result.CheckSnapshot("mysdk", "",
+		checkAndroidBpContents(`
+// This is auto-generated. DO NOT EDIT.
+
+cc_prebuilt_library_shared {
+    name: "mysdk_sslnil@current",
+    sdk_member_name: "sslnil",
+    installable: false,
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/sslnil.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/sslnil.so"],
+        },
+    },
+}
+
+cc_prebuilt_library_shared {
+    name: "sslnil",
+    prefer: false,
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/sslnil.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/sslnil.so"],
+        },
+    },
+}
+
+cc_prebuilt_library_shared {
+    name: "mysdk_sslempty@current",
+    sdk_member_name: "sslempty",
+    installable: false,
+    system_shared_libs: [],
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/sslempty.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/sslempty.so"],
+        },
+    },
+}
+
+cc_prebuilt_library_shared {
+    name: "sslempty",
+    prefer: false,
+    system_shared_libs: [],
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/sslempty.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/sslempty.so"],
+        },
+    },
+}
+
+cc_prebuilt_library_shared {
+    name: "mysdk_sslnonempty@current",
+    sdk_member_name: "sslnonempty",
+    installable: false,
+    system_shared_libs: ["mysdk_sslnil@current"],
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/sslnonempty.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/sslnonempty.so"],
+        },
+    },
+}
+
+cc_prebuilt_library_shared {
+    name: "sslnonempty",
+    prefer: false,
+    system_shared_libs: ["sslnil"],
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/sslnonempty.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/sslnonempty.so"],
+        },
+    },
+}
+
+sdk_snapshot {
+    name: "mysdk@current",
+    native_shared_libs: [
+        "mysdk_sslnil@current",
+        "mysdk_sslempty@current",
+        "mysdk_sslnonempty@current",
+    ],
+}
+`))
+
+	result = testSdkWithCc(t, `
+		sdk {
+			name: "mysdk",
+			host_supported: true,
+			native_shared_libs: ["sslvariants"],
+		}
+
+		cc_library {
+			name: "sslvariants",
+			host_supported: true,
+			target: {
+				android: {
+					system_shared_libs: [],
+				},
+			},
+		}
+	`)
+
+	result.CheckSnapshot("mysdk", "",
+		checkAndroidBpContents(`
+// This is auto-generated. DO NOT EDIT.
+
+cc_prebuilt_library_shared {
+    name: "mysdk_sslvariants@current",
+    sdk_member_name: "sslvariants",
+    host_supported: true,
+    installable: false,
+    target: {
+        android: {
+            system_shared_libs: [],
+        },
+        android_arm64: {
+            srcs: ["android/arm64/lib/sslvariants.so"],
+        },
+        android_arm: {
+            srcs: ["android/arm/lib/sslvariants.so"],
+        },
+        linux_glibc_x86_64: {
+            srcs: ["linux_glibc/x86_64/lib/sslvariants.so"],
+        },
+        linux_glibc_x86: {
+            srcs: ["linux_glibc/x86/lib/sslvariants.so"],
+        },
+    },
+}
+
+cc_prebuilt_library_shared {
+    name: "sslvariants",
+    prefer: false,
+    host_supported: true,
+    target: {
+        android: {
+            system_shared_libs: [],
+        },
+        android_arm64: {
+            srcs: ["android/arm64/lib/sslvariants.so"],
+        },
+        android_arm: {
+            srcs: ["android/arm/lib/sslvariants.so"],
+        },
+        linux_glibc_x86_64: {
+            srcs: ["linux_glibc/x86_64/lib/sslvariants.so"],
+        },
+        linux_glibc_x86: {
+            srcs: ["linux_glibc/x86/lib/sslvariants.so"],
+        },
+    },
+}
+
+sdk_snapshot {
+    name: "mysdk@current",
+    host_supported: true,
+    native_shared_libs: ["mysdk_sslvariants@current"],
+}
+`))
+}
+
+func TestStubsLibrary(t *testing.T) {
+	result := testSdkWithCc(t, `
+		sdk {
+			name: "mysdk",
+			native_shared_libs: ["stubslib"],
+		}
+
+		cc_library {
+			name: "stubslib",
+			stubs: {
+				symbol_file: "some/where/stubslib.map.txt",
+				versions: ["1", "2", "3"],
+			},
+		}
+	`)
+
+	result.CheckSnapshot("mysdk", "",
+		checkAndroidBpContents(`
+// This is auto-generated. DO NOT EDIT.
+
+cc_prebuilt_library_shared {
+    name: "mysdk_stubslib@current",
+    sdk_member_name: "stubslib",
+    installable: false,
+    stubs: {
+        versions: ["3"],
+    },
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/stubslib.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/stubslib.so"],
+        },
+    },
+}
+
+cc_prebuilt_library_shared {
+    name: "stubslib",
+    prefer: false,
+    stubs: {
+        versions: ["3"],
+    },
+    arch: {
+        arm64: {
+            srcs: ["arm64/lib/stubslib.so"],
+        },
+        arm: {
+            srcs: ["arm/lib/stubslib.so"],
+        },
+    },
+}
+
+sdk_snapshot {
+    name: "mysdk@current",
+    native_shared_libs: ["mysdk_stubslib@current"],
+}
+`))
+}
diff --git a/sdk/java_sdk_test.go b/sdk/java_sdk_test.go
index cbffb50..4a2c053 100644
--- a/sdk/java_sdk_test.go
+++ b/sdk/java_sdk_test.go
@@ -53,30 +53,18 @@
 			system_modules: "none",
 			sdk_version: "none",
 			host_supported: true,
-			apex_available: [
-				"//apex_available:platform",
-				"//apex_available:anyapex",
-			],
 		}
 
 		java_import {
 			name: "sdkmember_mysdk_1",
 			sdk_member_name: "sdkmember",
 			host_supported: true,
-			apex_available: [
-				"//apex_available:platform",
-				"//apex_available:anyapex",
-			],
 		}
 
 		java_import {
 			name: "sdkmember_mysdk_2",
 			sdk_member_name: "sdkmember",
 			host_supported: true,
-			apex_available: [
-				"//apex_available:platform",
-				"//apex_available:anyapex",
-			],
 		}
 
 		java_library {
diff --git a/sdk/sdk.go b/sdk/sdk.go
index dabdf85..cb5a605 100644
--- a/sdk/sdk.go
+++ b/sdk/sdk.go
@@ -312,7 +312,7 @@
 	ctx.BottomUp("SdkMemberInterVersion", memberInterVersionMutator).Parallel()
 }
 
-// RegisterPostDepshMutators registers post-deps mutators to support modules implementing SdkAware
+// RegisterPostDepsMutators registers post-deps mutators to support modules implementing SdkAware
 // interface and the sdk module type. This function has been made public to be called by tests
 // outside of the sdk package
 func RegisterPostDepsMutators(ctx android.RegisterMutatorsContext) {
@@ -431,23 +431,31 @@
 	}
 }
 
-// Step 6: ensure that the dependencies from outside of the APEX are all from the required SDKs
+// Step 6: ensure that the dependencies outside of the APEX are all from the required SDKs
 func sdkRequirementsMutator(mctx android.TopDownMutatorContext) {
 	if m, ok := mctx.Module().(interface {
-		DepIsInSameApex(ctx android.BaseModuleContext, dep android.Module) bool
-		RequiredSdks() android.SdkRefs
+		android.DepIsInSameApex
+		android.RequiredSdks
 	}); ok {
 		requiredSdks := m.RequiredSdks()
 		if len(requiredSdks) == 0 {
 			return
 		}
 		mctx.VisitDirectDeps(func(dep android.Module) {
-			if mctx.OtherModuleDependencyTag(dep) == android.DefaultsDepTag {
+			tag := mctx.OtherModuleDependencyTag(dep)
+			if tag == android.DefaultsDepTag {
 				// dependency to defaults is always okay
 				return
 			}
 
-			// If the dep is from outside of the APEX, but is not in any of the
+			// Ignore the dependency from the unversioned member to any versioned members as an
+			// apex that depends on the unversioned member will not also be depending on a versioned
+			// member.
+			if _, ok := tag.(sdkMemberVersionedDepTag); ok {
+				return
+			}
+
+			// If the dep is outside of the APEX, but is not in any of the
 			// required SDKs, we know that the dep is a violation.
 			if sa, ok := dep.(android.SdkAware); ok {
 				if !m.DepIsInSameApex(mctx, dep) && !requiredSdks.Contains(sa.ContainingSdk()) {
diff --git a/sysprop/sysprop_library.go b/sysprop/sysprop_library.go
index 65dbb22..a2e35d9 100644
--- a/sysprop/sysprop_library.go
+++ b/sysprop/sysprop_library.go
@@ -18,6 +18,7 @@
 	"fmt"
 	"io"
 	"path"
+	"sync"
 
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
@@ -115,6 +116,7 @@
 
 type syspropLibrary struct {
 	android.ModuleBase
+	android.ApexModuleBase
 
 	properties syspropLibraryProperties
 
@@ -154,8 +156,21 @@
 var (
 	pctx         = android.NewPackageContext("android/soong/sysprop")
 	syspropCcTag = dependencyTag{name: "syspropCc"}
+
+	syspropLibrariesKey  = android.NewOnceKey("syspropLibraries")
+	syspropLibrariesLock sync.Mutex
 )
 
+func syspropLibraries(config android.Config) *[]string {
+	return config.Once(syspropLibrariesKey, func() interface{} {
+		return &[]string{}
+	}).(*[]string)
+}
+
+func SyspropLibraries(config android.Config) []string {
+	return append([]string{}, *syspropLibraries(config)...)
+}
+
 func init() {
 	android.RegisterModuleType("sysprop_library", syspropLibraryFactory)
 }
@@ -195,6 +210,10 @@
 	return proptools.Bool(m.properties.Public_stub)
 }
 
+func (m *syspropLibrary) CurrentSyspropApiFile() android.Path {
+	return m.currentApiFile
+}
+
 func (m *syspropLibrary) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	baseModuleName := m.BaseModuleName()
 
@@ -296,6 +315,7 @@
 		&m.properties,
 	)
 	android.InitAndroidModule(m)
+	android.InitApexModule(m)
 	android.AddLoadHook(m, func(ctx android.LoadHookContext) { syspropLibraryHook(ctx, m) })
 	return m
 }
@@ -323,6 +343,7 @@
 	Recovery_available *bool
 	Vendor_available   *bool
 	Host_supported     *bool
+	Apex_available     []string
 }
 
 type javaLibraryProperties struct {
@@ -411,6 +432,7 @@
 	ccProps.Recovery_available = m.properties.Recovery_available
 	ccProps.Vendor_available = m.properties.Vendor_available
 	ccProps.Host_supported = m.properties.Host_supported
+	ccProps.Apex_available = m.ApexProperties.Apex_available
 	ctx.CreateModule(cc.LibraryFactory, &ccProps)
 
 	scope := "internal"
@@ -463,6 +485,12 @@
 			Stem:        proptools.StringPtr(m.BaseModuleName()),
 		})
 	}
+
+	syspropLibrariesLock.Lock()
+	defer syspropLibrariesLock.Unlock()
+
+	libraries := syspropLibraries(ctx.Config())
+	*libraries = append(*libraries, ctx.ModuleName())
 }
 
 func syspropDepsMutator(ctx android.BottomUpMutatorContext) {
diff --git a/sysprop/sysprop_test.go b/sysprop/sysprop_test.go
index 51da222..8503386 100644
--- a/sysprop/sysprop_test.go
+++ b/sysprop/sysprop_test.go
@@ -15,6 +15,8 @@
 package sysprop
 
 import (
+	"reflect"
+
 	"android/soong/android"
 	"android/soong/cc"
 	"android/soong/java"
@@ -157,6 +159,7 @@
 	ctx := test(t, `
 		sysprop_library {
 			name: "sysprop-platform",
+			apex_available: ["//apex_available:platform"],
 			srcs: ["android/sysprop/PlatformProperties.sysprop"],
 			api_packages: ["android.sysprop"],
 			property_owner: "Platform",
@@ -305,7 +308,12 @@
 		"android_arm64_armv8-a_shared",
 		"android_arm64_armv8-a_static",
 	} {
-		ctx.ModuleForTests("libsysprop-platform", variant)
+		library := ctx.ModuleForTests("libsysprop-platform", variant).Module().(*cc.Module)
+		expectedApexAvailableOnLibrary := []string{"//apex_available:platform"}
+		if !reflect.DeepEqual(library.ApexProperties.Apex_available, expectedApexAvailableOnLibrary) {
+			t.Errorf("apex available property on libsysprop-platform must be %#v, but was %#v.",
+				expectedApexAvailableOnLibrary, library.ApexProperties.Apex_available)
+		}
 
 		// core variant of vendor-owned sysprop_library is for product
 		ctx.ModuleForTests("libsysprop-vendor", variant)
diff --git a/ui/build/cleanbuild.go b/ui/build/cleanbuild.go
index 95d049a..0bcdccb 100644
--- a/ui/build/cleanbuild.go
+++ b/ui/build/cleanbuild.go
@@ -99,6 +99,7 @@
 		hostOut("sdk_addon"),
 		hostOut("testcases"),
 		hostOut("vts"),
+		hostOut("vts10"),
 		hostOut("vts-core"),
 		productOut("*.img"),
 		productOut("*.zip"),
diff --git a/ui/build/sandbox_linux.go b/ui/build/sandbox_linux.go
index 2de772b..4c3bac3 100644
--- a/ui/build/sandbox_linux.go
+++ b/ui/build/sandbox_linux.go
@@ -54,6 +54,9 @@
 
 	working bool
 	group   string
+	srcDir  string
+	outDir  string
+	distDir string
 }
 
 func (c *Cmd) sandboxSupported() bool {
@@ -72,15 +75,34 @@
 			sandboxConfig.group = "nobody"
 		}
 
-		cmd := exec.CommandContext(c.ctx.Context, nsjailPath,
+		sandboxConfig.srcDir = absPath(c.ctx, ".")
+		sandboxConfig.outDir = absPath(c.ctx, c.config.OutDir())
+		sandboxConfig.distDir = absPath(c.ctx, c.config.DistDir())
+
+		sandboxArgs := []string{
 			"-H", "android-build",
 			"-e",
 			"-u", "nobody",
 			"-g", sandboxConfig.group,
-			"-B", "/",
+			"-R", "/",
+			"-B", sandboxConfig.srcDir,
+			"-B", "/tmp",
+			"-B", sandboxConfig.outDir,
+		}
+
+		if _, err := os.Stat(sandboxConfig.distDir); !os.IsNotExist(err) {
+			//Mount dist dir as read-write if it already exists
+			sandboxArgs = append(sandboxArgs, "-B",
+				sandboxConfig.distDir)
+		}
+
+		sandboxArgs = append(sandboxArgs,
 			"--disable_clone_newcgroup",
 			"--",
 			"/bin/bash", "-c", `if [ $(hostname) == "android-build" ]; then echo "Android" "Success"; else echo Failure; fi`)
+
+		cmd := exec.CommandContext(c.ctx.Context, nsjailPath, sandboxArgs...)
+
 		cmd.Env = c.config.Environment().Environ()
 
 		c.ctx.Verboseln(cmd.Args)
@@ -144,8 +166,17 @@
 		"--rlimit_fsize", "soft",
 		"--rlimit_nofile", "soft",
 
-		// For now, just map everything. Eventually we should limit this, especially to make most things readonly.
-		"-B", "/",
+		// For now, just map everything. Make most things readonly.
+		"-R", "/",
+
+		// Mount source are read-write
+		"-B", sandboxConfig.srcDir,
+
+		//Mount out dir as read-write
+		"-B", sandboxConfig.outDir,
+
+		// Mount a writable tmp dir
+		"-B", "/tmp",
 
 		// Disable newcgroup for now, since it may require newer kernels
 		// TODO: try out cgroups
@@ -155,6 +186,11 @@
 		"-q",
 	}
 
+	if _, err := os.Stat(sandboxConfig.distDir); !os.IsNotExist(err) {
+		//Mount dist dir as read-write if it already exists
+		sandboxArgs = append(sandboxArgs, "-B", sandboxConfig.distDir)
+	}
+
 	if c.Sandbox.AllowBuildBrokenUsesNetwork && c.config.BuildBrokenUsesNetwork() {
 		c.ctx.Printf("AllowBuildBrokenUsesNetwork: %v", c.Sandbox.AllowBuildBrokenUsesNetwork)
 		c.ctx.Printf("BuildBrokenUsesNetwork: %v", c.config.BuildBrokenUsesNetwork())