Merge changes from topic "revert-3069323-revert-3066748-duplicate_entry_fs-CIBDJQYRHU-FVLDIVWUZV" into main

* changes:
  Revert^2 "Filesystem modules follow the installation semantic"
  Revert "Revert "Prevent multiple PackagingSpecs having same inst..."
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 317f5c4..e8cad7d 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -4,3 +4,4 @@
 
 [Hook Scripts]
 do_not_use_DO_NOT_MERGE = ${REPO_ROOT}/build/soong/scripts/check_do_not_merge.sh ${PREUPLOAD_COMMIT}
+aosp_hook = ${REPO_ROOT}/frameworks/base/tools/aosp/aosp_sha.sh ${PREUPLOAD_COMMIT} "."
diff --git a/aconfig/aconfig_declarations.go b/aconfig/aconfig_declarations.go
index d29e312..71a64dd 100644
--- a/aconfig/aconfig_declarations.go
+++ b/aconfig/aconfig_declarations.go
@@ -73,8 +73,9 @@
 	if len(module.properties.Package) == 0 {
 		ctx.PropertyErrorf("package", "missing package property")
 	}
-	// TODO(b/311155208): Add mandatory check for container after all pre-existing
-	// ones are changed.
+	if len(module.properties.Container) == 0 {
+		ctx.PropertyErrorf("container", "missing container property")
+	}
 
 	// Add a dependency on the aconfig_value_sets defined in
 	// RELEASE_ACONFIG_VALUE_SETS, and add any aconfig_values that
diff --git a/aconfig/aconfig_declarations_test.go b/aconfig/aconfig_declarations_test.go
index 5201fed..c37274c 100644
--- a/aconfig/aconfig_declarations_test.go
+++ b/aconfig/aconfig_declarations_test.go
@@ -88,19 +88,49 @@
 	android.AssertStringEquals(t, "rule must contain container", rule.Args["container"], "--container com.android.foo")
 }
 
-func TestAconfigDeclarationsWithoutContainer(t *testing.T) {
-	bp := `
-		aconfig_declarations {
-			name: "module_name",
-			package: "com.example.package",
-			srcs: [
-				"foo.aconfig",
-			],
-		}
-	`
-	result := runTest(t, android.FixtureExpectsNoErrors, bp)
-
-	module := result.ModuleForTests("module_name", "")
-	rule := module.Rule("aconfig")
-	android.AssertIntEquals(t, "rule must not contain container", len(rule.Args["container"]), 0)
+func TestMandatoryProperties(t *testing.T) {
+	testCases := []struct {
+		name          string
+		expectedError string
+		bp            string
+	}{
+		{
+			name: "Srcs missing from aconfig_declarations",
+			bp: `
+				aconfig_declarations {
+					name: "my_aconfig_declarations_foo",
+					package: "com.example.package",
+					container: "otherapex",
+				}`,
+			expectedError: `missing source files`,
+		},
+		{
+			name: "Package missing from aconfig_declarations",
+			bp: `
+				aconfig_declarations {
+					name: "my_aconfig_declarations_foo",
+					container: "otherapex",
+					srcs: ["foo.aconfig"],
+				}`,
+			expectedError: `missing package property`,
+		},
+		{
+			name: "Container missing from aconfig_declarations",
+			bp: `
+				aconfig_declarations {
+					name: "my_aconfig_declarations_foo",
+					package: "com.example.package",
+					srcs: ["foo.aconfig"],
+				}`,
+			expectedError: `missing container property`,
+		},
+	}
+	for _, test := range testCases {
+		t.Run(test.name, func(t *testing.T) {
+			errorHandler := android.FixtureExpectsAtLeastOneErrorMatchingPattern(test.expectedError)
+			android.GroupFixturePreparers(PrepareForTestWithAconfigBuildComponents).
+				ExtendWithErrorHandler(errorHandler).
+				RunTestWithBp(t, test.bp)
+		})
+	}
 }
diff --git a/aconfig/codegen/aconfig_declarations_group_test.go b/aconfig/codegen/aconfig_declarations_group_test.go
index ec7cea3..c69d21f 100644
--- a/aconfig/codegen/aconfig_declarations_group_test.go
+++ b/aconfig/codegen/aconfig_declarations_group_test.go
@@ -15,9 +15,10 @@
 package codegen
 
 import (
+	"testing"
+
 	"android/soong/android"
 	"android/soong/java"
-	"testing"
 )
 
 func TestAconfigDeclarationsGroup(t *testing.T) {
@@ -28,6 +29,7 @@
 		aconfig_declarations {
 			name: "foo-aconfig",
 			package: "com.example.package",
+			container: "com.android.foo",
 			srcs: ["foo.aconfig"],
 		}
 
@@ -39,6 +41,7 @@
 		aconfig_declarations {
 			name: "bar-aconfig",
 			package: "com.example.package",
+			container: "com.android.foo",
 			srcs: ["foo.aconfig"],
 		}
 
diff --git a/aconfig/codegen/cc_aconfig_library.go b/aconfig/codegen/cc_aconfig_library.go
index f3e9599..ec0a6b6 100644
--- a/aconfig/codegen/cc_aconfig_library.go
+++ b/aconfig/codegen/cc_aconfig_library.go
@@ -88,10 +88,13 @@
 	if mode != "force-read-only" {
 		deps.SharedLibs = append(deps.SharedLibs, baseLibDep)
 
-		deps.SharedLibs = append(deps.SharedLibs, libAconfigStorageReadApiCcDep)
-		deps.SharedLibs = append(deps.SharedLibs, libLogDep)
-		deps.SharedLibs = append(deps.SharedLibs, libBaseDep)
 	}
+
+	// TODO: after storage migration is over, don't add these in force-read-only-mode.
+	deps.SharedLibs = append(deps.SharedLibs, libAconfigStorageReadApiCcDep)
+	deps.SharedLibs = append(deps.SharedLibs, libBaseDep)
+	deps.SharedLibs = append(deps.SharedLibs, libLogDep)
+
 	// TODO: It'd be really nice if we could reexport this library and not make everyone do it.
 
 	return deps
diff --git a/aconfig/codegen/cc_aconfig_library_test.go b/aconfig/codegen/cc_aconfig_library_test.go
index 2e7fdc2..d01d13b 100644
--- a/aconfig/codegen/cc_aconfig_library_test.go
+++ b/aconfig/codegen/cc_aconfig_library_test.go
@@ -50,6 +50,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 			}
 
@@ -112,6 +113,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 			}
 
@@ -167,6 +169,7 @@
 		aconfig_declarations {
 			name: "my_aconfig_declarations_bar",
 			package: "com.example.package",
+			container: "com.android.foo",
 			srcs: ["bar.aconfig"],
 		}
 
@@ -241,6 +244,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 			}
 
@@ -249,6 +253,22 @@
 				aconfig_declarations: "my_aconfig_declarations",
 				mode: "force-read-only",
 			}
+
+
+			cc_library {
+    		                name: "libbase",
+    		                srcs: ["libbase.cc"],
+			}
+
+			cc_library {
+    		                name: "liblog",
+    		                srcs: ["liblog.cc"],
+			}
+
+			cc_library {
+    		                name: "libaconfig_storage_read_api_cc",
+    		                srcs: ["libaconfig_storage_read_api_cc.cc"],
+			}
 		`))
 
 	module := result.ModuleForTests("my_cc_aconfig_library", "android_arm64_armv8-a_shared").Module()
diff --git a/aconfig/codegen/java_aconfig_library_test.go b/aconfig/codegen/java_aconfig_library_test.go
index de45b5c..87b54a4 100644
--- a/aconfig/codegen/java_aconfig_library_test.go
+++ b/aconfig/codegen/java_aconfig_library_test.go
@@ -35,6 +35,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations_foo",
 				package: "com.example.package.foo",
+				container: "system",
 				srcs: ["foo.aconfig"],
 			}
 
@@ -46,6 +47,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations_bar",
 				package: "com.example.package.bar",
+				container: "system",
 				srcs: ["bar.aconfig"],
 			}
 
@@ -60,7 +62,7 @@
 	entry := android.AndroidMkEntriesForTest(t, result.TestContext, module)[0]
 
 	makeVar := entry.EntryMap["LOCAL_ACONFIG_FILES"]
-	android.EnsureListContainsSuffix(t, makeVar, "android_common/aconfig_merged.pb")
+	android.EnsureListContainsSuffix(t, makeVar, "android_common/system/aconfig_merged.pb")
 }
 
 func TestAndroidMkJavaLibrary(t *testing.T) {
@@ -175,6 +177,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 				exportable: true,
 			}
@@ -200,6 +203,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 			}
 
@@ -234,3 +238,52 @@
 func TestUnsupportedMode(t *testing.T) {
 	testCodegenModeWithError(t, "mode: `unsupported`,", "mode: \"unsupported\" is not a supported mode")
 }
+
+func TestMkEntriesMatchedContainer(t *testing.T) {
+	result := android.GroupFixturePreparers(
+		PrepareForTestWithAconfigBuildComponents,
+		java.PrepareForTestWithJavaDefaultModules).
+		ExtendWithErrorHandler(android.FixtureExpectsNoErrors).
+		RunTestWithBp(t, `
+			aconfig_declarations {
+				name: "my_aconfig_declarations_foo",
+				package: "com.example.package.foo",
+				container: "system",
+				srcs: ["foo.aconfig"],
+			}
+
+			java_aconfig_library {
+				name: "my_java_aconfig_library_foo",
+				aconfig_declarations: "my_aconfig_declarations_foo",
+			}
+
+			aconfig_declarations {
+				name: "my_aconfig_declarations_bar",
+				package: "com.example.package.bar",
+				container: "system_ext",
+				srcs: ["bar.aconfig"],
+			}
+
+			java_aconfig_library {
+				name: "my_java_aconfig_library_bar",
+				aconfig_declarations: "my_aconfig_declarations_bar",
+			}
+
+			java_library {
+				name: "my_module",
+				srcs: [
+					"src/foo.java",
+				],
+				static_libs: [
+					"my_java_aconfig_library_foo",
+					"my_java_aconfig_library_bar",
+				],
+				platform_apis: true,
+			}
+		`)
+
+	module := result.ModuleForTests("my_module", "android_common").Module()
+	entry := android.AndroidMkEntriesForTest(t, result.TestContext, module)[0]
+	makeVar := entry.EntryMap["LOCAL_ACONFIG_FILES"]
+	android.EnsureListContainsSuffix(t, makeVar, "my_aconfig_declarations_foo/intermediate.pb")
+}
diff --git a/aconfig/codegen/rust_aconfig_library_test.go b/aconfig/codegen/rust_aconfig_library_test.go
index fe28f94..523b464 100644
--- a/aconfig/codegen/rust_aconfig_library_test.go
+++ b/aconfig/codegen/rust_aconfig_library_test.go
@@ -46,6 +46,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 			}
 
@@ -131,6 +132,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 			}
 			rust_aconfig_library {
@@ -193,6 +195,7 @@
 			aconfig_declarations {
 				name: "my_aconfig_declarations",
 				package: "com.example.package",
+				container: "com.android.foo",
 				srcs: ["foo.aconfig"],
 			}
 			rust_aconfig_library {
diff --git a/android/Android.bp b/android/Android.bp
index f130d3a..f0be44b 100644
--- a/android/Android.bp
+++ b/android/Android.bp
@@ -60,6 +60,7 @@
         "license_metadata.go",
         "license_sdk_member.go",
         "licenses.go",
+        "logtags.go",
         "makevars.go",
         "metrics.go",
         "module.go",
diff --git a/android/androidmk.go b/android/androidmk.go
index 07f7c58..53f0609 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -36,6 +36,7 @@
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/bootstrap"
 	"github.com/google/blueprint/pathtools"
+	"github.com/google/blueprint/proptools"
 )
 
 func init() {
@@ -541,6 +542,11 @@
 		a.SetPath("LOCAL_SOONG_INSTALLED_MODULE", base.katiInstalls[len(base.katiInstalls)-1].to)
 		a.SetString("LOCAL_SOONG_INSTALL_PAIRS", base.katiInstalls.BuiltInstalled())
 		a.SetPaths("LOCAL_SOONG_INSTALL_SYMLINKS", base.katiSymlinks.InstallPaths().Paths())
+	} else {
+		// Soong may not have generated the install rule also when `no_full_install: true`.
+		// Mark this module as uninstallable in order to prevent Make from creating an
+		// install rule there.
+		a.SetBoolIfTrue("LOCAL_UNINSTALLABLE_MODULE", proptools.Bool(base.commonProperties.No_full_install))
 	}
 
 	if len(base.testData) > 0 {
diff --git a/android/config.go b/android/config.go
index b60eb5c..f6711e6 100644
--- a/android/config.go
+++ b/android/config.go
@@ -818,12 +818,12 @@
 }
 
 func (c *config) IsEnvTrue(key string) bool {
-	value := c.Getenv(key)
+	value := strings.ToLower(c.Getenv(key))
 	return value == "1" || value == "y" || value == "yes" || value == "on" || value == "true"
 }
 
 func (c *config) IsEnvFalse(key string) bool {
-	value := c.Getenv(key)
+	value := strings.ToLower(c.Getenv(key))
 	return value == "0" || value == "n" || value == "no" || value == "off" || value == "false"
 }
 
@@ -2104,6 +2104,7 @@
 		"RELEASE_APEX_CONTRIBUTIONS_IPSEC",
 		"RELEASE_APEX_CONTRIBUTIONS_MEDIA",
 		"RELEASE_APEX_CONTRIBUTIONS_MEDIAPROVIDER",
+		"RELEASE_APEX_CONTRIBUTIONS_MODULE_METADATA",
 		"RELEASE_APEX_CONTRIBUTIONS_NETWORKSTACKGOOGLE",
 		"RELEASE_APEX_CONTRIBUTIONS_NEURALNETWORKS",
 		"RELEASE_APEX_CONTRIBUTIONS_ONDEVICEPERSONALIZATION",
diff --git a/android/logtags.go b/android/logtags.go
new file mode 100644
index 0000000..d11cccf
--- /dev/null
+++ b/android/logtags.go
@@ -0,0 +1,56 @@
+// Copyright 2024 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import "github.com/google/blueprint"
+
+func init() {
+	RegisterParallelSingletonType("logtags", LogtagsSingleton)
+}
+
+type LogtagsInfo struct {
+	Logtags Paths
+}
+
+var LogtagsProviderKey = blueprint.NewProvider[*LogtagsInfo]()
+
+func LogtagsSingleton() Singleton {
+	return &logtagsSingleton{}
+}
+
+type logtagsSingleton struct{}
+
+func MergedLogtagsPath(ctx PathContext) OutputPath {
+	return PathForIntermediates(ctx, "all-event-log-tags.txt")
+}
+
+func (l *logtagsSingleton) GenerateBuildActions(ctx SingletonContext) {
+	var allLogtags Paths
+	ctx.VisitAllModules(func(module Module) {
+		if !module.ExportedToMake() {
+			return
+		}
+		if logtagsInfo, ok := SingletonModuleProvider(ctx, module, LogtagsProviderKey); ok {
+			allLogtags = append(allLogtags, logtagsInfo.Logtags...)
+		}
+	})
+
+	builder := NewRuleBuilder(pctx, ctx)
+	builder.Command().
+		BuiltTool("merge-event-log-tags").
+		FlagWithOutput("-o ", MergedLogtagsPath(ctx)).
+		Inputs(SortedUniquePaths(allLogtags))
+	builder.Build("all-event-log-tags.txt", "merge logtags")
+}
diff --git a/android/module.go b/android/module.go
index effca03..f8fec3a 100644
--- a/android/module.go
+++ b/android/module.go
@@ -484,6 +484,11 @@
 	// Set by osMutator.
 	CommonOSVariant bool `blueprint:"mutated"`
 
+	// When set to true, this module is not installed to the full install path (ex: under
+	// out/target/product/<name>/<partition>). It can be installed only to the packaging
+	// modules like android_filesystem.
+	No_full_install *bool
+
 	// When HideFromMake is set to true, no entry for this variant will be emitted in the
 	// generated Android.mk file.
 	HideFromMake bool `blueprint:"mutated"`
diff --git a/android/module_context.go b/android/module_context.go
index dea22ba..605d3ba 100644
--- a/android/module_context.go
+++ b/android/module_context.go
@@ -444,6 +444,21 @@
 	return false
 }
 
+// Tells whether this module is installed to the full install path (ex:
+// out/target/product/<name>/<partition>) or not. If this returns false, the install build rule is
+// not created and this module can only be installed to packaging modules like android_filesystem.
+func (m *moduleContext) requiresFullInstall() bool {
+	if m.skipInstall() {
+		return false
+	}
+
+	if proptools.Bool(m.module.base().commonProperties.No_full_install) {
+		return false
+	}
+
+	return true
+}
+
 func (m *moduleContext) InstallFile(installPath InstallPath, name string, srcPath Path,
 	deps ...InstallPath) InstallPath {
 	return m.installFile(installPath, name, srcPath, deps, false, true, nil)
@@ -490,7 +505,7 @@
 		m.module.base().hooks.runInstallHooks(m, srcPath, fullInstallPath, false)
 	}
 
-	if !m.skipInstall() {
+	if m.requiresFullInstall() {
 		deps = append(deps, InstallPaths(m.module.base().installFilesDepSet.ToList())...)
 		deps = append(deps, m.module.base().installedInitRcPaths...)
 		deps = append(deps, m.module.base().installedVintfFragmentsPaths...)
@@ -563,7 +578,7 @@
 	if err != nil {
 		panic(fmt.Sprintf("Unable to generate symlink between %q and %q: %s", fullInstallPath.Base(), srcPath.Base(), err))
 	}
-	if !m.skipInstall() {
+	if m.requiresFullInstall() {
 
 		if m.Config().KatiEnabled() {
 			// When creating the symlink rule in Soong but embedding in Make, write the rule to a
@@ -612,7 +627,7 @@
 	fullInstallPath := installPath.Join(m, name)
 	m.module.base().hooks.runInstallHooks(m, nil, fullInstallPath, true)
 
-	if !m.skipInstall() {
+	if m.requiresFullInstall() {
 		if m.Config().KatiEnabled() {
 			// When creating the symlink rule in Soong but embedding in Make, write the rule to a
 			// makefile instead of directly to the ninja file so that main.mk can add the
diff --git a/android/mutator.go b/android/mutator.go
index 75ba650..9cfdb60 100644
--- a/android/mutator.go
+++ b/android/mutator.go
@@ -293,15 +293,14 @@
 	// WalkDeps, etc.
 	AddInterVariantDependency(tag blueprint.DependencyTag, from, to blueprint.Module)
 
-	// ReplaceDependencies replaces all dependencies on the identical variant of the module with the
-	// specified name with the current variant of this module.  Replacements don't take effect until
-	// after the mutator pass is finished.
+	// ReplaceDependencies finds all the variants of the module with the specified name, then
+	// replaces all dependencies onto those variants with the current variant of this module.
+	// Replacements don't take effect until after the mutator pass is finished.
 	ReplaceDependencies(string)
 
-	// ReplaceDependencies replaces all dependencies on the identical variant of the module with the
-	// specified name with the current variant of this module as long as the supplied predicate returns
-	// true.
-	//
+	// ReplaceDependenciesIf finds all the variants of the module with the specified name, then
+	// replaces all dependencies onto those variants with the current variant of this module
+	// as long as the supplied predicate returns true.
 	// Replacements don't take effect until after the mutator pass is finished.
 	ReplaceDependenciesIf(string, blueprint.ReplaceDependencyPredicate)
 
@@ -595,11 +594,16 @@
 
 func (a *androidTransitionMutator) Mutate(ctx blueprint.BottomUpMutatorContext, variation string) {
 	if am, ok := ctx.Module().(Module); ok {
+		if variation != "" {
+			// TODO: this should really be checking whether the TransitionMutator affected this module, not
+			//  the empty variant, but TransitionMutator has no concept of skipping a module.
+			base := am.base()
+			base.commonProperties.DebugMutators = append(base.commonProperties.DebugMutators, a.name)
+			base.commonProperties.DebugVariations = append(base.commonProperties.DebugVariations, variation)
+		}
+
 		mctx := bottomUpMutatorContextFactory(ctx, am, a.finalPhase)
 		defer bottomUpMutatorContextPool.Put(mctx)
-		base := am.base()
-		base.commonProperties.DebugMutators = append(base.commonProperties.DebugMutators, a.name)
-		base.commonProperties.DebugVariations = append(base.commonProperties.DebugVariations, variation)
 		a.mutator.Mutate(mctx, variation)
 	}
 }
diff --git a/android/override_module.go b/android/override_module.go
index 1341f53..163f7b7 100644
--- a/android/override_module.go
+++ b/android/override_module.go
@@ -28,6 +28,7 @@
 // module based on it.
 
 import (
+	"fmt"
 	"sort"
 	"sync"
 
@@ -120,7 +121,7 @@
 	addOverride(o OverrideModule)
 	getOverrides() []OverrideModule
 
-	override(ctx BaseModuleContext, m Module, o OverrideModule)
+	override(ctx BaseModuleContext, bm OverridableModule, o OverrideModule)
 	GetOverriddenBy() string
 	GetOverriddenByModuleDir() string
 
@@ -191,15 +192,14 @@
 }
 
 // Overrides a base module with the given OverrideModule.
-func (b *OverridableModuleBase) override(ctx BaseModuleContext, m Module, o OverrideModule) {
-
+func (b *OverridableModuleBase) override(ctx BaseModuleContext, bm OverridableModule, o OverrideModule) {
 	for _, p := range b.overridableProperties {
 		for _, op := range o.getOverridingProperties() {
 			if proptools.TypeEqual(p, op) {
 				err := proptools.ExtendProperties(p, op, nil, proptools.OrderReplace)
 				if err != nil {
 					if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
-						ctx.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
+						ctx.OtherModulePropertyErrorf(bm, propertyErr.Property, "%s", propertyErr.Err.Error())
 					} else {
 						panic(err)
 					}
@@ -210,7 +210,7 @@
 	// Adds the base module to the overrides property, if exists, of the overriding module. See the
 	// comment on OverridableModuleBase.overridesProperty for details.
 	if b.overridesProperty != nil {
-		*b.overridesProperty = append(*b.overridesProperty, ctx.ModuleName())
+		*b.overridesProperty = append(*b.overridesProperty, ctx.OtherModuleName(bm))
 	}
 	b.overridableModuleProperties.OverriddenBy = o.Name()
 	b.overridableModuleProperties.OverriddenByModuleDir = o.ModuleDir()
@@ -235,7 +235,7 @@
 // to keep them in this order and not put any order mutators between them.
 func RegisterOverridePostDepsMutators(ctx RegisterMutatorsContext) {
 	ctx.BottomUp("override_deps", overrideModuleDepsMutator).Parallel()
-	ctx.BottomUp("perform_override", performOverrideMutator).Parallel()
+	ctx.Transition("override", &overrideTransitionMutator{})
 	// overridableModuleDepsMutator calls OverridablePropertiesDepsMutator so that overridable modules can
 	// add deps from overridable properties.
 	ctx.BottomUp("overridable_deps", overridableModuleDepsMutator).Parallel()
@@ -262,18 +262,6 @@
 			ctx.PropertyErrorf("base", "%q is not a valid module name", base)
 			return
 		}
-		// See if there's a prebuilt module that overrides this override module with prefer flag,
-		// in which case we call HideFromMake on the corresponding variant later.
-		ctx.VisitDirectDepsWithTag(PrebuiltDepTag, func(dep Module) {
-			prebuilt := GetEmbeddedPrebuilt(dep)
-			if prebuilt == nil {
-				panic("PrebuiltDepTag leads to a non-prebuilt module " + dep.Name())
-			}
-			if prebuilt.UsePrebuilt() {
-				module.setOverriddenByPrebuilt(dep)
-				return
-			}
-		})
 		baseModule := ctx.AddDependency(ctx.Module(), overrideBaseDepTag, *module.getOverrideModuleProperties().Base)[0]
 		if o, ok := baseModule.(OverridableModule); ok {
 			overrideModule := ctx.Module().(OverrideModule)
@@ -285,11 +273,13 @@
 
 // Now, goes through all overridable modules, finds all modules overriding them, creates a local
 // variant for each of them, and performs the actual overriding operation by calling override().
-func performOverrideMutator(ctx BottomUpMutatorContext) {
+type overrideTransitionMutator struct{}
+
+func (overrideTransitionMutator) Split(ctx BaseModuleContext) []string {
 	if b, ok := ctx.Module().(OverridableModule); ok {
 		overrides := b.getOverrides()
 		if len(overrides) == 0 {
-			return
+			return []string{""}
 		}
 		variants := make([]string, len(overrides)+1)
 		// The first variant is for the original, non-overridden, base module.
@@ -297,27 +287,69 @@
 		for i, o := range overrides {
 			variants[i+1] = o.(Module).Name()
 		}
-		mods := ctx.CreateLocalVariations(variants...)
-		// Make the original variation the default one to depend on if no other override module variant
-		// is specified.
-		ctx.AliasVariation(variants[0])
-		for i, o := range overrides {
-			mods[i+1].(OverridableModule).override(ctx, mods[i+1], o)
-			if prebuilt := o.getOverriddenByPrebuilt(); prebuilt != nil {
-				// The overriding module itself, too, is overridden by a prebuilt.
-				// Perform the same check for replacement
-				checkInvariantsForSourceAndPrebuilt(ctx, mods[i+1], prebuilt)
-				// Copy the flag and hide it in make
-				mods[i+1].ReplacedByPrebuilt()
-			}
-		}
+		return variants
 	} else if o, ok := ctx.Module().(OverrideModule); ok {
 		// Create a variant of the overriding module with its own name. This matches the above local
 		// variant name rule for overridden modules, and thus allows ReplaceDependencies to match the
 		// two.
-		ctx.CreateLocalVariations(o.Name())
-		// To allow dependencies to be added without having to know the above variation.
-		ctx.AliasVariation(o.Name())
+		return []string{o.Name()}
+	}
+
+	return []string{""}
+}
+
+func (overrideTransitionMutator) OutgoingTransition(ctx OutgoingTransitionContext, sourceVariation string) string {
+	if o, ok := ctx.Module().(OverrideModule); ok {
+		if ctx.DepTag() == overrideBaseDepTag {
+			return o.Name()
+		}
+	}
+
+	// Variations are always local and shouldn't affect the variant used for dependencies
+	return ""
+}
+
+func (overrideTransitionMutator) IncomingTransition(ctx IncomingTransitionContext, incomingVariation string) string {
+	if _, ok := ctx.Module().(OverridableModule); ok {
+		return incomingVariation
+	} else if o, ok := ctx.Module().(OverrideModule); ok {
+		// To allow dependencies to be added without having to know the variation.
+		return o.Name()
+	}
+
+	return ""
+}
+
+func (overrideTransitionMutator) Mutate(ctx BottomUpMutatorContext, variation string) {
+	if o, ok := ctx.Module().(OverrideModule); ok {
+		overridableDeps := ctx.GetDirectDepsWithTag(overrideBaseDepTag)
+		if len(overridableDeps) > 1 {
+			panic(fmt.Errorf("expected a single dependency with overrideBaseDepTag, found %q", overridableDeps))
+		} else if len(overridableDeps) == 1 {
+			b := overridableDeps[0].(OverridableModule)
+			b.override(ctx, b, o)
+
+			checkPrebuiltReplacesOverride(ctx, b)
+		}
+	}
+}
+
+func checkPrebuiltReplacesOverride(ctx BottomUpMutatorContext, b OverridableModule) {
+	// See if there's a prebuilt module that overrides this override module with prefer flag,
+	// in which case we call HideFromMake on the corresponding variant later.
+	prebuiltDeps := ctx.GetDirectDepsWithTag(PrebuiltDepTag)
+	for _, prebuiltDep := range prebuiltDeps {
+		prebuilt := GetEmbeddedPrebuilt(prebuiltDep)
+		if prebuilt == nil {
+			panic("PrebuiltDepTag leads to a non-prebuilt module " + prebuiltDep.Name())
+		}
+		if prebuilt.UsePrebuilt() {
+			// The overriding module itself, too, is overridden by a prebuilt.
+			// Perform the same check for replacement
+			checkInvariantsForSourceAndPrebuilt(ctx, b, prebuiltDep)
+			// Copy the flag and hide it in make
+			b.ReplacedByPrebuilt()
+		}
 	}
 }
 
diff --git a/android/paths.go b/android/paths.go
index 2b33f67..39b660c 100644
--- a/android/paths.go
+++ b/android/paths.go
@@ -277,6 +277,7 @@
 
 type genPathProvider interface {
 	genPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleGenPath
+	genPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir, ext string, trimExt string) ModuleGenPath
 }
 type objPathProvider interface {
 	objPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleObjPath
@@ -295,6 +296,16 @@
 	return PathForModuleGen(ctx)
 }
 
+// GenPathWithExtAndTrimExt derives a new file path in ctx's generated sources directory
+// from the current path, but with the new extension and trim the suffix.
+func GenPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir string, p Path, ext string, trimExt string) ModuleGenPath {
+	if path, ok := p.(genPathProvider); ok {
+		return path.genPathWithExtAndTrimExt(ctx, subdir, ext, trimExt)
+	}
+	ReportPathErrorf(ctx, "Tried to create generated file from unsupported path: %s(%s)", reflect.TypeOf(p).Name(), p)
+	return PathForModuleGen(ctx)
+}
+
 // ObjPathWithExt derives a new file path in ctx's object directory from the
 // current path, but with the new extension.
 func ObjPathWithExt(ctx ModuleOutPathContext, subdir string, p Path, ext string) ModuleObjPath {
@@ -1507,6 +1518,17 @@
 	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }
 
+func (p SourcePath) genPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir, ext string, trimExt string) ModuleGenPath {
+	// If Trim_extension being set, force append Output_extension without replace original extension.
+	if trimExt != "" {
+		if ext != "" {
+			return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt)+"."+ext)
+		}
+		return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt))
+	}
+	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
+}
+
 func (p SourcePath) objPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleObjPath {
 	return PathForModuleObj(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }
@@ -1594,6 +1616,17 @@
 	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }
 
+func (p ModuleGenPath) genPathWithExtAndTrimExt(ctx ModuleOutPathContext, subdir, ext string, trimExt string) ModuleGenPath {
+	// If Trim_extension being set, force append Output_extension without replace original extension.
+	if trimExt != "" {
+		if ext != "" {
+			return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt)+"."+ext)
+		}
+		return PathForModuleGen(ctx, subdir, strings.TrimSuffix(p.path, trimExt))
+	}
+	return PathForModuleGen(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
+}
+
 func (p ModuleGenPath) objPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleObjPath {
 	return PathForModuleObj(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
 }
diff --git a/android/sdk_version.go b/android/sdk_version.go
index b2ff960..01b55d0 100644
--- a/android/sdk_version.go
+++ b/android/sdk_version.go
@@ -40,9 +40,15 @@
 // SdkKind represents a particular category of an SDK spec like public, system, test, etc.
 type SdkKind int
 
+// These are generally ordered from the narrower sdk version to the wider sdk version,
+// but not all entries have a strict subset/superset relationship.
+// For example, SdkTest and SdkModule do not have a strict subset/superset relationship but both
+// are supersets of SdkSystem.
+// The general trend should be kept when an additional sdk kind is added.
 const (
 	SdkInvalid SdkKind = iota
 	SdkNone
+	SdkToolchain // API surface provided by ART to compile other API domains
 	SdkCore
 	SdkCorePlatform
 	SdkIntraCore // API surface provided by one core module to another
@@ -53,7 +59,6 @@
 	SdkModule
 	SdkSystemServer
 	SdkPrivate
-	SdkToolchain // API surface provided by ART to compile other API domains
 )
 
 // String returns the string representation of this SdkKind
diff --git a/android/selects_test.go b/android/selects_test.go
index 8563285..d9499a5 100644
--- a/android/selects_test.go
+++ b/android/selects_test.go
@@ -633,6 +633,61 @@
 			},
 			expectedError: "Expected all branches of a select on condition boolean_var_for_testing\\(\\) to have type bool, found string",
 		},
+		{
+			name: "Assigning select to nonconfigurable bool",
+			bp: `
+			my_module_type {
+				name: "foo",
+				my_nonconfigurable_bool: select(arch(), {
+					"x86_64": true,
+					default: false,
+				}),
+			}
+			`,
+			expectedError: `can't assign select statement to non-configurable property "my_nonconfigurable_bool"`,
+		},
+		{
+			name: "Assigning select to nonconfigurable string",
+			bp: `
+			my_module_type {
+				name: "foo",
+				my_nonconfigurable_string: select(arch(), {
+					"x86_64": "x86!",
+					default: "unknown!",
+				}),
+			}
+			`,
+			expectedError: `can't assign select statement to non-configurable property "my_nonconfigurable_string"`,
+		},
+		{
+			name: "Assigning appended selects to nonconfigurable string",
+			bp: `
+			my_module_type {
+				name: "foo",
+				my_nonconfigurable_string: select(arch(), {
+					"x86_64": "x86!",
+					default: "unknown!",
+				}) + select(os(), {
+					"darwin": "_darwin!",
+					default: "unknown!",
+				}),
+			}
+			`,
+			expectedError: `can't assign select statement to non-configurable property "my_nonconfigurable_string"`,
+		},
+		{
+			name: "Assigning select to nonconfigurable string list",
+			bp: `
+			my_module_type {
+				name: "foo",
+				my_nonconfigurable_string_list: select(arch(), {
+					"x86_64": ["foo", "bar"],
+					default: ["baz", "qux"],
+				}),
+			}
+			`,
+			expectedError: `can't assign select statement to non-configurable property "my_nonconfigurable_string_list"`,
+		},
 	}
 
 	for _, tc := range testCases {
@@ -674,11 +729,14 @@
 }
 
 type selectsTestProvider struct {
-	my_bool               *bool
-	my_string             *string
-	my_string_list        *[]string
-	my_paths              *[]string
-	replacing_string_list *[]string
+	my_bool                        *bool
+	my_string                      *string
+	my_string_list                 *[]string
+	my_paths                       *[]string
+	replacing_string_list          *[]string
+	my_nonconfigurable_bool        *bool
+	my_nonconfigurable_string      *string
+	my_nonconfigurable_string_list []string
 }
 
 func (p *selectsTestProvider) String() string {
@@ -690,23 +748,42 @@
 	if p.my_string != nil {
 		myStringStr = *p.my_string
 	}
+	myNonconfigurableStringStr := "nil"
+	if p.my_string != nil {
+		myNonconfigurableStringStr = *p.my_nonconfigurable_string
+	}
 	return fmt.Sprintf(`selectsTestProvider {
 	my_bool: %v,
 	my_string: %s,
     my_string_list: %s,
     my_paths: %s,
 	replacing_string_list %s,
-}`, myBoolStr, myStringStr, p.my_string_list, p.my_paths, p.replacing_string_list)
+	my_nonconfigurable_bool: %v,
+	my_nonconfigurable_string: %s,
+	my_nonconfigurable_string_list: %s,
+}`,
+		myBoolStr,
+		myStringStr,
+		p.my_string_list,
+		p.my_paths,
+		p.replacing_string_list,
+		p.my_nonconfigurable_bool,
+		myNonconfigurableStringStr,
+		p.my_nonconfigurable_string_list,
+	)
 }
 
 var selectsTestProviderKey = blueprint.NewProvider[selectsTestProvider]()
 
 type selectsMockModuleProperties struct {
-	My_bool               proptools.Configurable[bool]
-	My_string             proptools.Configurable[string]
-	My_string_list        proptools.Configurable[[]string]
-	My_paths              proptools.Configurable[[]string] `android:"path"`
-	Replacing_string_list proptools.Configurable[[]string] `android:"replace_instead_of_append,arch_variant"`
+	My_bool                        proptools.Configurable[bool]
+	My_string                      proptools.Configurable[string]
+	My_string_list                 proptools.Configurable[[]string]
+	My_paths                       proptools.Configurable[[]string] `android:"path"`
+	Replacing_string_list          proptools.Configurable[[]string] `android:"replace_instead_of_append,arch_variant"`
+	My_nonconfigurable_bool        *bool
+	My_nonconfigurable_string      *string
+	My_nonconfigurable_string_list []string
 }
 
 type selectsMockModule struct {
@@ -717,11 +794,14 @@
 
 func (p *selectsMockModule) GenerateAndroidBuildActions(ctx ModuleContext) {
 	SetProvider(ctx, selectsTestProviderKey, selectsTestProvider{
-		my_bool:               p.properties.My_bool.Get(ctx),
-		my_string:             p.properties.My_string.Get(ctx),
-		my_string_list:        p.properties.My_string_list.Get(ctx),
-		my_paths:              p.properties.My_paths.Get(ctx),
-		replacing_string_list: p.properties.Replacing_string_list.Get(ctx),
+		my_bool:                        p.properties.My_bool.Get(ctx),
+		my_string:                      p.properties.My_string.Get(ctx),
+		my_string_list:                 p.properties.My_string_list.Get(ctx),
+		my_paths:                       p.properties.My_paths.Get(ctx),
+		replacing_string_list:          p.properties.Replacing_string_list.Get(ctx),
+		my_nonconfigurable_bool:        p.properties.My_nonconfigurable_bool,
+		my_nonconfigurable_string:      p.properties.My_nonconfigurable_string,
+		my_nonconfigurable_string_list: p.properties.My_nonconfigurable_string_list,
 	})
 }
 
diff --git a/androidmk/androidmk/android.go b/androidmk/androidmk/android.go
index 9d61e1c..8a8bb2e 100644
--- a/androidmk/androidmk/android.go
+++ b/androidmk/androidmk/android.go
@@ -151,7 +151,7 @@
 			"LOCAL_CLANG_CFLAGS":                  "clang_cflags",
 			"LOCAL_YACCFLAGS":                     "yacc.flags",
 			"LOCAL_SANITIZE_RECOVER":              "sanitize.recover",
-			"LOCAL_LOGTAGS_FILES":                 "logtags",
+			"LOCAL_SOONG_LOGTAGS_FILES":           "logtags",
 			"LOCAL_EXPORT_HEADER_LIBRARY_HEADERS": "export_header_lib_headers",
 			"LOCAL_EXPORT_SHARED_LIBRARY_HEADERS": "export_shared_lib_headers",
 			"LOCAL_EXPORT_STATIC_LIBRARY_HEADERS": "export_static_lib_headers",
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 3e284b1..0b26f16 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -3671,34 +3671,13 @@
 
 func vndkLibrariesTxtFiles(vers ...string) (result string) {
 	for _, v := range vers {
-		if v == "current" {
-			for _, txt := range []string{"vndkcore", "vndksp", "vndkprivate", "vndkproduct"} {
-				result += `
-					` + txt + `_libraries_txt {
-						name: "` + txt + `.libraries.txt",
-						insert_vndk_version: true,
-					}
-				`
-			}
+		for _, txt := range []string{"llndk", "vndkcore", "vndksp", "vndkprivate", "vndkproduct"} {
 			result += `
-				llndk_libraries_txt {
-					name: "llndk.libraries.txt",
-				}
-				llndk_libraries_txt_for_apex {
-					name: "llndk.libraries.txt.apex",
-					stem: "llndk.libraries.txt",
-					insert_vndk_version: true,
-				}
-			`
-		} else {
-			for _, txt := range []string{"llndk", "vndkcore", "vndksp", "vndkprivate", "vndkproduct"} {
-				result += `
 					prebuilt_etc {
 						name: "` + txt + `.libraries.` + v + `.txt",
 						src: "dummy.txt",
 					}
 				`
-			}
 		}
 	}
 	return
@@ -11428,6 +11407,7 @@
 			aconfig_declarations {
 				name: "%[1]s",
 				package: "com.example.package",
+				container: "system",
 				srcs: [
 					"%[1]s.aconfig",
 				],
diff --git a/cc/androidmk.go b/cc/androidmk.go
index ef26366..071d829 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -88,7 +88,7 @@
 		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
 			func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
 				if len(c.Properties.Logtags) > 0 {
-					entries.AddStrings("LOCAL_LOGTAGS_FILES", c.Properties.Logtags...)
+					entries.AddStrings("LOCAL_SOONG_LOGTAGS_FILES", c.logtagsPaths.Strings()...)
 				}
 				// Note: Pass the exact value of AndroidMkSystemSharedLibs to the Make
 				// world, even if it is an empty list. In the Make world,
diff --git a/cc/cc.go b/cc/cc.go
index e3954d7..b48a573 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -50,6 +50,7 @@
 	ctx.PreDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.BottomUp("sdk", sdkMutator).Parallel()
 		ctx.BottomUp("vndk", VndkMutator).Parallel()
+		ctx.BottomUp("llndk", llndkMutator).Parallel()
 		ctx.BottomUp("link", LinkageMutator).Parallel()
 		ctx.BottomUp("test_per_src", TestPerSrcMutator).Parallel()
 		ctx.BottomUp("version", versionMutator).Parallel()
@@ -319,7 +320,7 @@
 
 	// *.logtags files, to combine together in order to generate the /system/etc/event-log-tags
 	// file
-	Logtags []string
+	Logtags []string `android:"path"`
 
 	// Make this module available when building for ramdisk.
 	// On device without a dedicated recovery partition, the module is only
@@ -908,6 +909,8 @@
 
 	// Aconfig files for all transitive deps.  Also exposed via TransitiveDeclarationsInfo
 	mergedAconfigFiles map[string]android.Paths
+
+	logtagsPaths android.Paths
 }
 
 func (c *Module) AddJSONData(d *map[string]interface{}) {
@@ -1997,6 +2000,11 @@
 func (c *Module) GenerateAndroidBuildActions(actx android.ModuleContext) {
 	ctx := moduleContextFromAndroidModuleContext(actx, c)
 
+	c.logtagsPaths = android.PathsForModuleSrc(actx, c.Properties.Logtags)
+	android.SetProvider(ctx, android.LogtagsProviderKey, &android.LogtagsInfo{
+		Logtags: c.logtagsPaths,
+	})
+
 	// If Test_only is set on a module in bp file, respect the setting, otherwise
 	// see if is a known test module type.
 	testOnly := c.testModule || c.testLibrary()
diff --git a/cc/linker.go b/cc/linker.go
index 9686697..56a68b2 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -330,6 +330,7 @@
 		deps.StaticLibs = removeListFromList(deps.StaticLibs, linker.Properties.Target.Vendor.Exclude_static_libs)
 		deps.HeaderLibs = append(deps.HeaderLibs, linker.Properties.Target.Vendor.Header_libs...)
 		deps.HeaderLibs = removeListFromList(deps.HeaderLibs, linker.Properties.Target.Vendor.Exclude_header_libs)
+		deps.ReexportHeaderLibHeaders = removeListFromList(deps.ReexportHeaderLibHeaders, linker.Properties.Target.Vendor.Exclude_header_libs)
 		deps.ReexportStaticLibHeaders = removeListFromList(deps.ReexportStaticLibHeaders, linker.Properties.Target.Vendor.Exclude_static_libs)
 		deps.WholeStaticLibs = removeListFromList(deps.WholeStaticLibs, linker.Properties.Target.Vendor.Exclude_static_libs)
 		deps.RuntimeLibs = removeListFromList(deps.RuntimeLibs, linker.Properties.Target.Vendor.Exclude_runtime_libs)
@@ -342,6 +343,7 @@
 		deps.StaticLibs = append(deps.StaticLibs, linker.Properties.Target.Product.Static_libs...)
 		deps.StaticLibs = removeListFromList(deps.StaticLibs, linker.Properties.Target.Product.Exclude_static_libs)
 		deps.HeaderLibs = removeListFromList(deps.HeaderLibs, linker.Properties.Target.Product.Exclude_header_libs)
+		deps.ReexportHeaderLibHeaders = removeListFromList(deps.ReexportHeaderLibHeaders, linker.Properties.Target.Product.Exclude_header_libs)
 		deps.ReexportStaticLibHeaders = removeListFromList(deps.ReexportStaticLibHeaders, linker.Properties.Target.Product.Exclude_static_libs)
 		deps.WholeStaticLibs = removeListFromList(deps.WholeStaticLibs, linker.Properties.Target.Product.Exclude_static_libs)
 		deps.RuntimeLibs = removeListFromList(deps.RuntimeLibs, linker.Properties.Target.Product.Exclude_runtime_libs)
diff --git a/cc/llndk_library.go b/cc/llndk_library.go
index 9e727a1..ae9da98 100644
--- a/cc/llndk_library.go
+++ b/cc/llndk_library.go
@@ -16,12 +16,12 @@
 
 import (
 	"android/soong/android"
+	"android/soong/etc"
 	"strings"
 )
 
 var (
 	llndkLibrarySuffix = ".llndk"
-	llndkHeadersSuffix = ".llndk"
 )
 
 // Holds properties to describe a stub shared library based on the provided version file.
@@ -78,3 +78,138 @@
 	ctx.Strict("LLNDK_MOVED_TO_APEX_LIBRARIES",
 		strings.Join(android.SortedKeys(movedToApexLlndkLibraries), " "))
 }
+
+func init() {
+	RegisterLlndkLibraryTxtType(android.InitRegistrationContext)
+}
+
+func RegisterLlndkLibraryTxtType(ctx android.RegistrationContext) {
+	ctx.RegisterParallelSingletonModuleType("llndk_libraries_txt", llndkLibrariesTxtFactory)
+}
+
+type llndkLibrariesTxtModule struct {
+	android.SingletonModuleBase
+
+	outputFile  android.OutputPath
+	moduleNames []string
+	fileNames   []string
+}
+
+var _ etc.PrebuiltEtcModule = &llndkLibrariesTxtModule{}
+var _ android.OutputFileProducer = &llndkLibrariesTxtModule{}
+
+// llndk_libraries_txt is a singleton module whose content is a list of LLNDK libraries
+// generated by Soong but can be referenced by other modules.
+// For example, apex_vndk can depend on these files as prebuilt.
+// Make uses LLNDK_LIBRARIES to determine which libraries to install.
+// HWASAN is only part of the LL-NDK in builds in which libc depends on HWASAN.
+// Therefore, by removing the library here, we cause it to only be installed if libc
+// depends on it.
+func llndkLibrariesTxtFactory() android.SingletonModule {
+	m := &llndkLibrariesTxtModule{}
+	android.InitAndroidArchModule(m, android.DeviceSupported, android.MultilibCommon)
+	return m
+}
+
+func (txt *llndkLibrariesTxtModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+	filename := txt.Name()
+
+	txt.outputFile = android.PathForModuleOut(ctx, filename).OutputPath
+
+	installPath := android.PathForModuleInstall(ctx, "etc")
+	ctx.InstallFile(installPath, filename, txt.outputFile)
+}
+
+func (txt *llndkLibrariesTxtModule) GenerateSingletonBuildActions(ctx android.SingletonContext) {
+	ctx.VisitAllModules(func(m android.Module) {
+		if c, ok := m.(*Module); ok && c.VendorProperties.IsLLNDK && !c.Header() && !c.IsVndkPrebuiltLibrary() {
+			filename, err := getVndkFileName(c)
+			if err != nil {
+				ctx.ModuleErrorf(m, "%s", err)
+			}
+
+			if !strings.HasPrefix(ctx.ModuleName(m), "libclang_rt.hwasan") {
+				txt.moduleNames = append(txt.moduleNames, ctx.ModuleName(m))
+			}
+			txt.fileNames = append(txt.fileNames, filename)
+		}
+	})
+	txt.moduleNames = android.SortedUniqueStrings(txt.moduleNames)
+	txt.fileNames = android.SortedUniqueStrings(txt.fileNames)
+
+	android.WriteFileRule(ctx, txt.outputFile, strings.Join(txt.fileNames, "\n"))
+}
+
+func (txt *llndkLibrariesTxtModule) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{{
+		Class:      "ETC",
+		OutputFile: android.OptionalPathForPath(txt.outputFile),
+		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
+			func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
+				entries.SetString("LOCAL_MODULE_STEM", txt.outputFile.Base())
+			},
+		},
+	}}
+}
+
+func (txt *llndkLibrariesTxtModule) MakeVars(ctx android.MakeVarsContext) {
+	ctx.Strict("LLNDK_LIBRARIES", strings.Join(txt.moduleNames, " "))
+}
+
+// PrebuiltEtcModule interface
+func (txt *llndkLibrariesTxtModule) OutputFile() android.OutputPath {
+	return txt.outputFile
+}
+
+// PrebuiltEtcModule interface
+func (txt *llndkLibrariesTxtModule) BaseDir() string {
+	return "etc"
+}
+
+// PrebuiltEtcModule interface
+func (txt *llndkLibrariesTxtModule) SubDir() string {
+	return ""
+}
+
+func (txt *llndkLibrariesTxtModule) OutputFiles(tag string) (android.Paths, error) {
+	return android.Paths{txt.outputFile}, nil
+}
+
+func llndkMutator(mctx android.BottomUpMutatorContext) {
+	m, ok := mctx.Module().(*Module)
+	if !ok {
+		return
+	}
+
+	if shouldSkipLlndkMutator(m) {
+		return
+	}
+
+	lib, isLib := m.linker.(*libraryDecorator)
+	prebuiltLib, isPrebuiltLib := m.linker.(*prebuiltLibraryLinker)
+
+	if m.InVendorOrProduct() && isLib && lib.hasLLNDKStubs() {
+		m.VendorProperties.IsLLNDK = true
+	}
+	if m.InVendorOrProduct() && isPrebuiltLib && prebuiltLib.hasLLNDKStubs() {
+		m.VendorProperties.IsLLNDK = true
+	}
+
+	if m.IsVndkPrebuiltLibrary() && !m.IsVndk() {
+		m.VendorProperties.IsLLNDK = true
+	}
+}
+
+// Check for modules that mustn't be LLNDK
+func shouldSkipLlndkMutator(m *Module) bool {
+	if !m.Enabled() {
+		return true
+	}
+	if !m.Device() {
+		return true
+	}
+	if m.Target().NativeBridge == android.NativeBridgeEnabled {
+		return true
+	}
+	return false
+}
diff --git a/cc/prebuilt.go b/cc/prebuilt.go
index cbb5d58..e9f790f 100644
--- a/cc/prebuilt.go
+++ b/cc/prebuilt.go
@@ -177,7 +177,7 @@
 				implicits = append(implicits, importLibOutputFile)
 
 				ctx.Build(pctx, android.BuildParams{
-					Rule:        android.Cp,
+					Rule:        android.CpExecutable,
 					Description: "prebuilt import library",
 					Input:       importLibSrc,
 					Output:      importLibOutputFile,
@@ -188,7 +188,7 @@
 			}
 
 			ctx.Build(pctx, android.BuildParams{
-				Rule:        android.Cp,
+				Rule:        android.CpExecutable,
 				Description: "prebuilt shared library",
 				Implicits:   implicits,
 				Input:       in,
diff --git a/cc/sanitize.go b/cc/sanitize.go
index db046ec..a0cbb51 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -55,7 +55,6 @@
 		// higher number of "optimized out" stack variables.
 		// b/112437883.
 		"-instcombine-lower-dbg-declare=0",
-		"-hwasan-use-after-scope=1",
 		"-dom-tree-reachability-max-bbs-to-explore=128",
 	}
 
@@ -82,7 +81,8 @@
 		"-fno-sanitize-recover=integer,undefined"}
 	hwasanGlobalOptions = []string{"heap_history_size=1023", "stack_history_size=512",
 		"export_memory_stats=0", "max_malloc_fill_size=131072", "malloc_fill_byte=0"}
-	memtagStackCommonFlags = []string{"-march=armv8-a+memtag", "-mllvm", "-dom-tree-reachability-max-bbs-to-explore=128"}
+	memtagStackCommonFlags = []string{"-march=armv8-a+memtag"}
+	memtagStackLlvmFlags = []string{"-dom-tree-reachability-max-bbs-to-explore=128"}
 
 	hostOnlySanitizeFlags   = []string{"-fno-sanitize-recover=all"}
 	deviceOnlySanitizeFlags = []string{"-fsanitize-trap=all"}
@@ -176,11 +176,11 @@
 
 func (t SanitizerType) registerMutators(ctx android.RegisterMutatorsContext) {
 	switch t {
-	case cfi, Hwasan, Asan, tsan, Fuzzer, scs:
+	case cfi, Hwasan, Asan, tsan, Fuzzer, scs, Memtag_stack:
 		sanitizer := &sanitizerSplitMutator{t}
 		ctx.TopDown(t.variationName()+"_markapexes", sanitizer.markSanitizableApexesMutator)
 		ctx.Transition(t.variationName(), sanitizer)
-	case Memtag_heap, Memtag_stack, Memtag_globals, intOverflow:
+	case Memtag_heap, Memtag_globals, intOverflow:
 		// do nothing
 	default:
 		panic(fmt.Errorf("unknown SanitizerType %d", t))
@@ -407,6 +407,7 @@
 
 	android.RegisterMakeVarsProvider(pctx, cfiMakeVarsProvider)
 	android.RegisterMakeVarsProvider(pctx, hwasanMakeVarsProvider)
+	android.RegisterMakeVarsProvider(pctx, memtagStackMakeVarsProvider)
 }
 
 func (sanitize *sanitize) props() []interface{} {
@@ -683,10 +684,14 @@
 		s.Diag.Cfi = nil
 	}
 
-	// HWASan ramdisk (which is built from recovery) goes over some bootloader limit.
-	// Keep libc instrumented so that ramdisk / vendor_ramdisk / recovery can run hwasan-instrumented code if necessary.
-	if (ctx.inRamdisk() || ctx.inVendorRamdisk() || ctx.inRecovery()) && !strings.HasPrefix(ctx.ModuleDir(), "bionic/libc") {
-		s.Hwaddress = nil
+	if ctx.inRamdisk() || ctx.inVendorRamdisk() || ctx.inRecovery() {
+		// HWASan ramdisk (which is built from recovery) goes over some bootloader limit.
+		// Keep libc instrumented so that ramdisk / vendor_ramdisk / recovery can run hwasan-instrumented code if necessary.
+		if !strings.HasPrefix(ctx.ModuleDir(), "bionic/libc") {
+			s.Hwaddress = nil
+		}
+		// Memtag stack in ramdisk makes pKVM unhappy.
+		s.Memtag_stack = nil
 	}
 
 	if ctx.staticBinary() {
@@ -879,6 +884,13 @@
 		flags.Local.CFlags = append(flags.Local.CFlags, memtagStackCommonFlags...)
 		flags.Local.AsFlags = append(flags.Local.AsFlags, memtagStackCommonFlags...)
 		flags.Local.LdFlags = append(flags.Local.LdFlags, memtagStackCommonFlags...)
+
+		for _, flag := range memtagStackLlvmFlags {
+			flags.Local.CFlags = append(flags.Local.CFlags, "-mllvm", flag)
+		}
+		for _, flag := range memtagStackLlvmFlags {
+			flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-mllvm,"+flag)
+		}
 	}
 
 	if (Bool(sanProps.Memtag_heap) || Bool(sanProps.Memtag_stack) || Bool(sanProps.Memtag_globals)) && ctx.binary() {
@@ -1303,6 +1315,8 @@
 					hwasanStaticLibs(mctx.Config()).add(c, c.Module().Name())
 				} else if s.sanitizer == cfi {
 					cfiStaticLibs(mctx.Config()).add(c, c.Module().Name())
+				} else if s.sanitizer == Memtag_stack {
+					memtagStackStaticLibs(mctx.Config()).add(c, c.Module().Name());
 				}
 			}
 		} else if c.IsSanitizerEnabled(s.sanitizer) {
@@ -1715,6 +1729,14 @@
 	}).(*sanitizerStaticLibsMap)
 }
 
+var memtagStackStaticLibsKey = android.NewOnceKey("memtagStackStaticLibs")
+
+func memtagStackStaticLibs(config android.Config) *sanitizerStaticLibsMap {
+	return config.Once(memtagStackStaticLibsKey, func() interface{} {
+		return newSanitizerStaticLibsMap(Memtag_stack)
+	}).(*sanitizerStaticLibsMap)
+}
+
 func enableMinimalRuntime(sanitize *sanitize) bool {
 	if sanitize.isSanitizerEnabled(Asan) {
 		return false
@@ -1761,3 +1783,7 @@
 func hwasanMakeVarsProvider(ctx android.MakeVarsContext) {
 	hwasanStaticLibs(ctx.Config()).exportToMake(ctx)
 }
+
+func memtagStackMakeVarsProvider(ctx android.MakeVarsContext) {
+	memtagStackStaticLibs(ctx.Config()).exportToMake(ctx)
+}
diff --git a/cc/testing.go b/cc/testing.go
index 20c435a..4b4e866 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -554,6 +554,7 @@
 		ctx.RegisterModuleType("vndk_prebuilt_shared", VndkPrebuiltSharedFactory)
 
 		RegisterVndkLibraryTxtTypes(ctx)
+		RegisterLlndkLibraryTxtType(ctx)
 	}),
 
 	// Additional files needed in tests that disallow non-existent source files.
@@ -570,17 +571,17 @@
 
 	// Additional files needed in tests that disallow non-existent source.
 	android.MockFS{
-		"defaults/cc/common/libc.map.txt":      nil,
-		"defaults/cc/common/libdl.map.txt":     nil,
-		"defaults/cc/common/libft2.map.txt":    nil,
-		"defaults/cc/common/libm.map.txt":      nil,
-		"defaults/cc/common/ndk_libc++_shared": nil,
-		"defaults/cc/common/crtbegin_so.c":     nil,
-		"defaults/cc/common/crtbegin.c":        nil,
-		"defaults/cc/common/crtend_so.c":       nil,
-		"defaults/cc/common/crtend.c":          nil,
-		"defaults/cc/common/crtbrand.c":        nil,
-		"external/compiler-rt/lib/cfi/cfi_blocklist.txt":   nil,
+		"defaults/cc/common/libc.map.txt":                nil,
+		"defaults/cc/common/libdl.map.txt":               nil,
+		"defaults/cc/common/libft2.map.txt":              nil,
+		"defaults/cc/common/libm.map.txt":                nil,
+		"defaults/cc/common/ndk_libc++_shared":           nil,
+		"defaults/cc/common/crtbegin_so.c":               nil,
+		"defaults/cc/common/crtbegin.c":                  nil,
+		"defaults/cc/common/crtend_so.c":                 nil,
+		"defaults/cc/common/crtend.c":                    nil,
+		"defaults/cc/common/crtbrand.c":                  nil,
+		"external/compiler-rt/lib/cfi/cfi_blocklist.txt": nil,
 
 		"defaults/cc/common/libclang_rt.ubsan_minimal.android_arm64.a": nil,
 		"defaults/cc/common/libclang_rt.ubsan_minimal.android_arm.a":   nil,
@@ -702,6 +703,7 @@
 	ctx.RegisterModuleType("vndk_prebuilt_shared", VndkPrebuiltSharedFactory)
 
 	RegisterVndkLibraryTxtTypes(ctx)
+	RegisterLlndkLibraryTxtType(ctx)
 
 	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
 	android.RegisterPrebuiltMutators(ctx)
diff --git a/cc/vndk.go b/cc/vndk.go
index 14b44b6..50e6d4b 100644
--- a/cc/vndk.go
+++ b/cc/vndk.go
@@ -219,7 +219,6 @@
 type moduleListerFunc func(ctx android.SingletonContext) (moduleNames, fileNames []string)
 
 var (
-	llndkLibraries                = vndkModuleLister(func(m *Module) bool { return m.VendorProperties.IsLLNDK && !m.Header() })
 	vndkSPLibraries               = vndkModuleLister(func(m *Module) bool { return m.VendorProperties.IsVNDKSP })
 	vndkCoreLibraries             = vndkModuleLister(func(m *Module) bool { return m.VendorProperties.IsVNDKCore })
 	vndkPrivateLibraries          = vndkModuleLister(func(m *Module) bool { return m.VendorProperties.IsVNDKPrivate })
@@ -378,19 +377,12 @@
 	prebuiltLib, isPrebuiltLib := m.linker.(*prebuiltLibraryLinker)
 
 	if m.InVendorOrProduct() && isLib && lib.hasLLNDKStubs() {
-		m.VendorProperties.IsLLNDK = true
 		m.VendorProperties.IsVNDKPrivate = Bool(lib.Properties.Llndk.Private)
 	}
 	if m.InVendorOrProduct() && isPrebuiltLib && prebuiltLib.hasLLNDKStubs() {
-		m.VendorProperties.IsLLNDK = true
 		m.VendorProperties.IsVNDKPrivate = Bool(prebuiltLib.Properties.Llndk.Private)
 	}
 
-	if m.IsVndkPrebuiltLibrary() && !m.IsVndk() {
-		m.VendorProperties.IsLLNDK = true
-		// TODO(b/280697209): copy "llndk.private" flag to vndk_prebuilt_shared
-	}
-
 	if (isLib && lib.buildShared()) || (isPrebuiltLib && prebuiltLib.buildShared()) {
 		if m.vndkdep != nil && m.vndkdep.isVndk() && !m.vndkdep.isVndkExt() {
 			processVndkLibrary(mctx, m)
@@ -404,8 +396,6 @@
 }
 
 func RegisterVndkLibraryTxtTypes(ctx android.RegistrationContext) {
-	ctx.RegisterParallelSingletonModuleType("llndk_libraries_txt", llndkLibrariesTxtFactory)
-	ctx.RegisterParallelSingletonModuleType("llndk_libraries_txt_for_apex", llndkLibrariesTxtApexOnlyFactory)
 	ctx.RegisterParallelSingletonModuleType("vndksp_libraries_txt", vndkSPLibrariesTxtFactory)
 	ctx.RegisterParallelSingletonModuleType("vndkcore_libraries_txt", vndkCoreLibrariesTxtFactory)
 	ctx.RegisterParallelSingletonModuleType("vndkprivate_libraries_txt", vndkPrivateLibrariesTxtFactory)
@@ -435,25 +425,6 @@
 var _ etc.PrebuiltEtcModule = &vndkLibrariesTxt{}
 var _ android.OutputFileProducer = &vndkLibrariesTxt{}
 
-// llndk_libraries_txt is a singleton module whose content is a list of LLNDK libraries
-// generated by Soong.
-// Make uses LLNDK_LIBRARIES to determine which libraries to install.
-// HWASAN is only part of the LLNDK in builds in which libc depends on HWASAN.
-// Therefore, by removing the library here, we cause it to only be installed if libc
-// depends on it.
-func llndkLibrariesTxtFactory() android.SingletonModule {
-	return newVndkLibrariesWithMakeVarFilter(llndkLibraries, "LLNDK_LIBRARIES", "libclang_rt.hwasan")
-}
-
-// llndk_libraries_txt_for_apex is a singleton module that provide the same LLNDK libraries list
-// with the llndk_libraries_txt, but skips setting make variable LLNDK_LIBRARIES. So, it must not
-// be used without installing llndk_libraries_txt singleton.
-// We include llndk_libraries_txt by default to install the llndk.libraries.txt file to system/etc.
-// This singleton module is to install the llndk.libraries.<ver>.txt file to vndk apex.
-func llndkLibrariesTxtApexOnlyFactory() android.SingletonModule {
-	return newVndkLibrariesWithMakeVarFilter(llndkLibraries, "", "libclang_rt.hwasan")
-}
-
 // vndksp_libraries_txt is a singleton module whose content is a list of VNDKSP libraries
 // generated by Soong but can be referenced by other modules.
 // For example, apex_vndk can depend on these files as prebuilt.
diff --git a/cmd/release_config/build_flag/main.go b/cmd/release_config/build_flag/main.go
index ec7d64f..56c49d8 100644
--- a/cmd/release_config/build_flag/main.go
+++ b/cmd/release_config/build_flag/main.go
@@ -325,7 +325,12 @@
 	}
 
 	if len(commonFlags.targetReleases) == 0 {
-		commonFlags.targetReleases = rc_lib.StringList{"trunk_staging"}
+		release, ok := os.LookupEnv("TARGET_RELEASE")
+		if ok {
+			commonFlags.targetReleases = rc_lib.StringList{release}
+		} else {
+			commonFlags.targetReleases = rc_lib.StringList{"trunk_staging"}
+		}
 	}
 
 	if err = os.Chdir(commonFlags.top); err != nil {
diff --git a/cmd/release_config/crunch_flags/main.go b/cmd/release_config/crunch_flags/main.go
index 95342b1..4d763c8 100644
--- a/cmd/release_config/crunch_flags/main.go
+++ b/cmd/release_config/crunch_flags/main.go
@@ -21,6 +21,7 @@
 	manualFlagNamePrefixes []string = []string{
 		"RELEASE_ACONFIG_",
 		"RELEASE_PLATFORM_",
+		"RELEASE_BUILD_FLAGS_",
 	}
 
 	// Set `aconfig_flags_only: true` in these release configs.
diff --git a/cmd/release_config/release_config/main.go b/cmd/release_config/release_config/main.go
index c443257..101dbe3 100644
--- a/cmd/release_config/release_config/main.go
+++ b/cmd/release_config/release_config/main.go
@@ -35,6 +35,7 @@
 	var product string
 	var allMake bool
 	var useBuildVar bool
+	var guard bool
 
 	defaultRelease := os.Getenv("TARGET_RELEASE")
 	if defaultRelease == "" {
@@ -52,6 +53,7 @@
 	flag.BoolVar(&pb, "pb", true, "write artifacts as binary protobuf")
 	flag.BoolVar(&allMake, "all_make", true, "write makefiles for all release configs")
 	flag.BoolVar(&useBuildVar, "use_get_build_var", false, "use get_build_var PRODUCT_RELEASE_CONFIG_MAPS")
+	flag.BoolVar(&guard, "guard", true, "whether to guard with RELEASE_BUILD_FLAGS_IN_PROTOBUF")
 
 	flag.Parse()
 
@@ -70,26 +72,27 @@
 	if err != nil {
 		panic(err)
 	}
-	releaseName := config.Name
 	err = os.MkdirAll(outputDir, 0775)
 	if err != nil {
 		panic(err)
 	}
 
-	if err = config.WritePartitionBuildFlags(outputDir, product, targetRelease); err != nil {
-		panic(err)
-	}
-
-	if allMake {
+	makefilePath := filepath.Join(outputDir, fmt.Sprintf("release_config-%s-%s.mk", product, targetRelease))
+	useProto, ok := config.FlagArtifacts["RELEASE_BUILD_FLAGS_IN_PROTOBUF"]
+	if guard && (!ok || rc_lib.MarshalValue(useProto.Value) == "") {
+		// We were told to guard operation and either we have no build flag, or it is False.
+		// Write an empty file so that release_config.mk will use the old process.
+		os.WriteFile(makefilePath, []byte{}, 0644)
+	} else if allMake {
+		// Write one makefile per release config, using the canonical release name.
 		for k, _ := range configs.ReleaseConfigs {
-			makefilePath := filepath.Join(outputDir, fmt.Sprintf("release_config-%s-%s.mk", product, k))
+			makefilePath = filepath.Join(outputDir, fmt.Sprintf("release_config-%s-%s.mk", product, k))
 			err = configs.WriteMakefile(makefilePath, k)
 			if err != nil {
 				panic(err)
 			}
 		}
 	} else {
-		makefilePath := filepath.Join(outputDir, fmt.Sprintf("release_config-%s-%s.mk", product, releaseName))
 		err = configs.WriteMakefile(makefilePath, targetRelease)
 		if err != nil {
 			panic(err)
@@ -113,4 +116,8 @@
 			panic(err)
 		}
 	}
+	if err = config.WritePartitionBuildFlags(outputDir, product, targetRelease); err != nil {
+		panic(err)
+	}
+
 }
diff --git a/cmd/release_config/release_config_lib/flag_value.go b/cmd/release_config/release_config_lib/flag_value.go
index e155e77..59021e2 100644
--- a/cmd/release_config/release_config_lib/flag_value.go
+++ b/cmd/release_config/release_config_lib/flag_value.go
@@ -52,6 +52,9 @@
 }
 
 func MarshalValue(value *rc_proto.Value) string {
+	if value == nil {
+		return ""
+	}
 	switch val := value.Val.(type) {
 	case *rc_proto.Value_UnspecifiedValue:
 		// Value was never set.
diff --git a/cmd/release_config/release_config_lib/flag_value_test.go b/cmd/release_config/release_config_lib/flag_value_test.go
index aaa4caf..8a98baf 100644
--- a/cmd/release_config/release_config_lib/flag_value_test.go
+++ b/cmd/release_config/release_config_lib/flag_value_test.go
@@ -24,7 +24,7 @@
 	"google.golang.org/protobuf/proto"
 )
 
-type testCaseFlagValue struct {
+type testCaseFlagValueFactory struct {
 	protoPath string
 	name      string
 	data      []byte
@@ -32,14 +32,14 @@
 	err       error
 }
 
-func (tc testCaseFlagValue) assertProtoEqual(t *testing.T, expected, actual proto.Message) {
+func (tc testCaseFlagValueFactory) assertProtoEqual(t *testing.T, expected, actual proto.Message) {
 	if !proto.Equal(expected, actual) {
 		t.Errorf("Expected %q found %q", expected, actual)
 	}
 }
 
-func TestFlagValue(t *testing.T) {
-	testCases := []testCaseFlagValue{
+func TestFlagValueFactory(t *testing.T) {
+	testCases := []testCaseFlagValueFactory{
 		{
 			name:      "stringVal",
 			protoPath: "build/release/flag_values/test/RELEASE_FOO.textproto",
@@ -65,3 +65,50 @@
 		tc.assertProtoEqual(t, &tc.expected, &actual.proto)
 	}
 }
+
+type testCaseMarshalValue struct {
+	name     string
+	value    *rc_proto.Value
+	expected string
+}
+
+func TestMarshalValue(t *testing.T) {
+	testCases := []testCaseMarshalValue{
+		{
+			name:     "nil",
+			value:    nil,
+			expected: "",
+		},
+		{
+			name:     "unspecified",
+			value:    &rc_proto.Value{},
+			expected: "",
+		},
+		{
+			name:     "false",
+			value:    &rc_proto.Value{Val: &rc_proto.Value_BoolValue{false}},
+			expected: "",
+		},
+		{
+			name:     "true",
+			value:    &rc_proto.Value{Val: &rc_proto.Value_BoolValue{true}},
+			expected: "true",
+		},
+		{
+			name:     "string",
+			value:    &rc_proto.Value{Val: &rc_proto.Value_StringValue{"BAR"}},
+			expected: "BAR",
+		},
+		{
+			name:     "obsolete",
+			value:    &rc_proto.Value{Val: &rc_proto.Value_Obsolete{true}},
+			expected: " #OBSOLETE",
+		},
+	}
+	for _, tc := range testCases {
+		actual := MarshalValue(tc.value)
+		if actual != tc.expected {
+			t.Errorf("Expected %q found %q", tc.expected, actual)
+		}
+	}
+}
diff --git a/cmd/release_config/release_config_lib/release_config.go b/cmd/release_config/release_config_lib/release_config.go
index e51ff08..f25cc6e 100644
--- a/cmd/release_config/release_config_lib/release_config.go
+++ b/cmd/release_config/release_config_lib/release_config.go
@@ -90,7 +90,13 @@
 		if !ok {
 			return fmt.Errorf("Could not inherit flag %s from %s", name, iConfig.Name)
 		}
-		if len(fa.Traces) > 1 {
+		if name == "RELEASE_ACONFIG_VALUE_SETS" {
+			if len(fa.Traces) > 0 {
+				myFa.Traces = append(myFa.Traces, fa.Traces...)
+				myFa.Value = &rc_proto.Value{Val: &rc_proto.Value_StringValue{
+					myFa.Value.GetStringValue() + " " + fa.Value.GetStringValue()}}
+			}
+		} else if len(fa.Traces) > 1 {
 			// A value was assigned. Set our value.
 			myFa.Traces = append(myFa.Traces, fa.Traces[1:]...)
 			myFa.Value = fa.Value
@@ -111,21 +117,7 @@
 
 	// Start with only the flag declarations.
 	config.FlagArtifacts = configs.FlagArtifacts.Clone()
-	// Add RELEASE_ACONFIG_VALUE_SETS
-	workflowManual := rc_proto.Workflow(rc_proto.Workflow_MANUAL)
-	releaseAconfigValueSets := FlagArtifact{
-		FlagDeclaration: &rc_proto.FlagDeclaration{
-			Name:        proto.String("RELEASE_ACONFIG_VALUE_SETS"),
-			Namespace:   proto.String("android_UNKNOWN"),
-			Description: proto.String("Aconfig value sets assembled by release-config"),
-			Workflow:    &workflowManual,
-			Containers:  []string{"system", "system_ext", "product", "vendor"},
-			Value:       &rc_proto.Value{Val: &rc_proto.Value_UnspecifiedValue{false}},
-		},
-		DeclarationIndex: -1,
-		Traces:           []*rc_proto.Tracepoint{},
-	}
-	config.FlagArtifacts["RELEASE_ACONFIG_VALUE_SETS"] = &releaseAconfigValueSets
+	releaseAconfigValueSets := config.FlagArtifacts["RELEASE_ACONFIG_VALUE_SETS"]
 
 	// Generate any configs we need to inherit.  This will detect loops in
 	// the config.
@@ -154,27 +146,22 @@
 	}
 	contributionsToApply = append(contributionsToApply, config.Contributions...)
 
-	myAconfigValueSets := strings.Split(releaseAconfigValueSets.Value.GetStringValue(), " ")
-	myAconfigValueSetsMap := map[string]bool{}
-	for _, v := range myAconfigValueSets {
-		myAconfigValueSetsMap[v] = true
-	}
+	workflowManual := rc_proto.Workflow(rc_proto.Workflow_MANUAL)
 	myDirsMap := make(map[int]bool)
 	for _, contrib := range contributionsToApply {
 		contribAconfigValueSets := []string{}
-		// Gather the aconfig_value_sets from this contribution that are not already in the list.
+		// Gather the aconfig_value_sets from this contribution, allowing duplicates for simplicity.
 		for _, v := range contrib.proto.AconfigValueSets {
-			if _, ok := myAconfigValueSetsMap[v]; !ok {
-				contribAconfigValueSets = append(contribAconfigValueSets, v)
-				myAconfigValueSetsMap[v] = true
-			}
+			contribAconfigValueSets = append(contribAconfigValueSets, v)
 		}
-		myAconfigValueSets = append(myAconfigValueSets, contribAconfigValueSets...)
+		contribAconfigValueSetsString := strings.Join(contribAconfigValueSets, " ")
+		releaseAconfigValueSets.Value = &rc_proto.Value{Val: &rc_proto.Value_StringValue{
+			releaseAconfigValueSets.Value.GetStringValue() + " " + contribAconfigValueSetsString}}
 		releaseAconfigValueSets.Traces = append(
 			releaseAconfigValueSets.Traces,
 			&rc_proto.Tracepoint{
 				Source: proto.String(contrib.path),
-				Value:  &rc_proto.Value{Val: &rc_proto.Value_StringValue{strings.Join(contribAconfigValueSets, " ")}},
+				Value:  &rc_proto.Value{Val: &rc_proto.Value_StringValue{contribAconfigValueSetsString}},
 			})
 
 		myDirsMap[contrib.DeclarationIndex] = true
@@ -204,6 +191,16 @@
 			}
 		}
 	}
+	// Now remove any duplicates from the actual value of RELEASE_ACONFIG_VALUE_SETS
+	myAconfigValueSets := []string{}
+	myAconfigValueSetsMap := map[string]bool{}
+	for _, v := range strings.Split(releaseAconfigValueSets.Value.GetStringValue(), " ") {
+		if myAconfigValueSetsMap[v] {
+			continue
+		}
+		myAconfigValueSetsMap[v] = true
+		myAconfigValueSets = append(myAconfigValueSets, v)
+	}
 	releaseAconfigValueSets.Value = &rc_proto.Value{Val: &rc_proto.Value_StringValue{strings.TrimSpace(strings.Join(myAconfigValueSets, " "))}}
 
 	directories := []string{}
diff --git a/cmd/release_config/release_config_lib/release_configs.go b/cmd/release_config/release_config_lib/release_configs.go
index cedf247..3429400 100644
--- a/cmd/release_config/release_config_lib/release_configs.go
+++ b/cmd/release_config/release_config_lib/release_configs.go
@@ -95,7 +95,7 @@
 }
 
 func ReleaseConfigsFactory() (c *ReleaseConfigs) {
-	return &ReleaseConfigs{
+	configs := ReleaseConfigs{
 		Aliases:              make(map[string]*string),
 		FlagArtifacts:        make(map[string]*FlagArtifact),
 		ReleaseConfigs:       make(map[string]*ReleaseConfig),
@@ -103,6 +103,21 @@
 		configDirs:           []string{},
 		configDirIndexes:     make(ReleaseConfigDirMap),
 	}
+	workflowManual := rc_proto.Workflow(rc_proto.Workflow_MANUAL)
+	releaseAconfigValueSets := FlagArtifact{
+		FlagDeclaration: &rc_proto.FlagDeclaration{
+			Name:        proto.String("RELEASE_ACONFIG_VALUE_SETS"),
+			Namespace:   proto.String("android_UNKNOWN"),
+			Description: proto.String("Aconfig value sets assembled by release-config"),
+			Workflow:    &workflowManual,
+			Containers:  []string{"system", "system_ext", "product", "vendor"},
+			Value:       &rc_proto.Value{Val: &rc_proto.Value_UnspecifiedValue{false}},
+		},
+		DeclarationIndex: -1,
+		Traces:           []*rc_proto.Tracepoint{},
+	}
+	configs.FlagArtifacts["RELEASE_ACONFIG_VALUE_SETS"] = &releaseAconfigValueSets
+	return &configs
 }
 
 func ReleaseConfigMapFactory(protoPath string) (m *ReleaseConfigMap) {
@@ -166,6 +181,9 @@
 		}
 		m.FlagDeclarations = append(m.FlagDeclarations, *flagDeclaration)
 		name := *flagDeclaration.Name
+		if name == "RELEASE_ACONFIG_VALUE_SETS" {
+			return fmt.Errorf("%s: %s is a reserved build flag", path, name)
+		}
 		if def, ok := configs.FlagArtifacts[name]; !ok {
 			configs.FlagArtifacts[name] = &FlagArtifact{FlagDeclaration: flagDeclaration, DeclarationIndex: ConfigDirIndex}
 		} else if !proto.Equal(def.FlagDeclaration, flagDeclaration) {
@@ -176,7 +194,7 @@
 			FlagValue{path: path, proto: rc_proto.FlagValue{
 				Name: proto.String(name), Value: flagDeclaration.Value}})
 		if configs.FlagArtifacts[name].Redacted {
-			return fmt.Errorf("%s may not be redacted by default.", *flagDeclaration.Name)
+			return fmt.Errorf("%s may not be redacted by default.", name)
 		}
 		return nil
 	})
@@ -203,6 +221,9 @@
 			if fmt.Sprintf("%s.textproto", *flagValue.proto.Name) != filepath.Base(path) {
 				return fmt.Errorf("%s incorrectly sets value for flag %s", path, *flagValue.proto.Name)
 			}
+			if *flagValue.proto.Name == "RELEASE_ACONFIG_VALUE_SETS" {
+				return fmt.Errorf("%s: %s is a reserved build flag", path, *flagValue.proto.Name)
+			}
 			releaseConfigContribution.FlagValues = append(releaseConfigContribution.FlagValues, flagValue)
 			return nil
 		})
@@ -382,7 +403,9 @@
 		if len(releaseConfigMapPaths) == 0 {
 			return nil, fmt.Errorf("No maps found")
 		}
-		warnf("No --map argument provided.  Using: --map %s\n", strings.Join(releaseConfigMapPaths, " --map "))
+		if !useBuildVar {
+			warnf("No --map argument provided.  Using: --map %s\n", strings.Join(releaseConfigMapPaths, " --map "))
+		}
 	}
 
 	configs := ReleaseConfigsFactory()
diff --git a/etc/prebuilt_etc.go b/etc/prebuilt_etc.go
index d1c1d85..025ba27 100644
--- a/etc/prebuilt_etc.go
+++ b/etc/prebuilt_etc.go
@@ -55,6 +55,9 @@
 	ctx.RegisterModuleType("prebuilt_usr_share", PrebuiltUserShareFactory)
 	ctx.RegisterModuleType("prebuilt_usr_share_host", PrebuiltUserShareHostFactory)
 	ctx.RegisterModuleType("prebuilt_usr_hyphendata", PrebuiltUserHyphenDataFactory)
+	ctx.RegisterModuleType("prebuilt_usr_keylayout", PrebuiltUserKeyLayoutFactory)
+	ctx.RegisterModuleType("prebuilt_usr_keychars", PrebuiltUserKeyCharsFactory)
+	ctx.RegisterModuleType("prebuilt_usr_idc", PrebuiltUserIdcFactory)
 	ctx.RegisterModuleType("prebuilt_font", PrebuiltFontFactory)
 	ctx.RegisterModuleType("prebuilt_firmware", PrebuiltFirmwareFactory)
 	ctx.RegisterModuleType("prebuilt_dsp", PrebuiltDSPFactory)
@@ -609,6 +612,39 @@
 	return module
 }
 
+// prebuilt_usr_keylayout is for a prebuilt artifact that is installed in
+// <partition>/usr/keylayout/<sub_dir> directory.
+func PrebuiltUserKeyLayoutFactory() android.Module {
+	module := &PrebuiltEtc{}
+	InitPrebuiltEtcModule(module, "usr/keylayout")
+	// This module is device-only
+	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
+	android.InitDefaultableModule(module)
+	return module
+}
+
+// prebuilt_usr_keychars is for a prebuilt artifact that is installed in
+// <partition>/usr/keychars/<sub_dir> directory.
+func PrebuiltUserKeyCharsFactory() android.Module {
+	module := &PrebuiltEtc{}
+	InitPrebuiltEtcModule(module, "usr/keychars")
+	// This module is device-only
+	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
+	android.InitDefaultableModule(module)
+	return module
+}
+
+// prebuilt_usr_idc is for a prebuilt artifact that is installed in
+// <partition>/usr/idc/<sub_dir> directory.
+func PrebuiltUserIdcFactory() android.Module {
+	module := &PrebuiltEtc{}
+	InitPrebuiltEtcModule(module, "usr/idc")
+	// This module is device-only
+	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
+	android.InitDefaultableModule(module)
+	return module
+}
+
 // prebuilt_font installs a font in <partition>/fonts directory.
 func PrebuiltFontFactory() android.Module {
 	module := &PrebuiltEtc{}
diff --git a/etc/prebuilt_etc_test.go b/etc/prebuilt_etc_test.go
index dd9958c..3ee2340 100644
--- a/etc/prebuilt_etc_test.go
+++ b/etc/prebuilt_etc_test.go
@@ -287,6 +287,48 @@
 	android.AssertPathRelativeToTopEquals(t, "install dir", expected, p.installDirPath)
 }
 
+func TestPrebuiltPrebuiltUserKeyLayoutInstallDirPath(t *testing.T) {
+	result := prepareForPrebuiltEtcTest.RunTestWithBp(t, `
+	prebuilt_usr_keylayout {
+			name: "foo.conf",
+			src: "foo.conf",
+			sub_dir: "bar",
+		}
+	`)
+
+	p := result.Module("foo.conf", "android_arm64_armv8-a").(*PrebuiltEtc)
+	expected := "out/soong/target/product/test_device/system/usr/keylayout/bar"
+	android.AssertPathRelativeToTopEquals(t, "install dir", expected, p.installDirPath)
+}
+
+func TestPrebuiltPrebuiltUserKeyCharsInstallDirPath(t *testing.T) {
+	result := prepareForPrebuiltEtcTest.RunTestWithBp(t, `
+	prebuilt_usr_keychars {
+			name: "foo.conf",
+			src: "foo.conf",
+			sub_dir: "bar",
+		}
+	`)
+
+	p := result.Module("foo.conf", "android_arm64_armv8-a").(*PrebuiltEtc)
+	expected := "out/soong/target/product/test_device/system/usr/keychars/bar"
+	android.AssertPathRelativeToTopEquals(t, "install dir", expected, p.installDirPath)
+}
+
+func TestPrebuiltPrebuiltUserIdcInstallDirPath(t *testing.T) {
+	result := prepareForPrebuiltEtcTest.RunTestWithBp(t, `
+	prebuilt_usr_idc {
+			name: "foo.conf",
+			src: "foo.conf",
+			sub_dir: "bar",
+		}
+	`)
+
+	p := result.Module("foo.conf", "android_arm64_armv8-a").(*PrebuiltEtc)
+	expected := "out/soong/target/product/test_device/system/usr/idc/bar"
+	android.AssertPathRelativeToTopEquals(t, "install dir", expected, p.installDirPath)
+}
+
 func TestPrebuiltFontInstallDirPath(t *testing.T) {
 	result := prepareForPrebuiltEtcTest.RunTestWithBp(t, `
 		prebuilt_font {
diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index 5bcfce7..b342ae9 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -127,6 +127,10 @@
 	// the make version.
 	Include_make_built_files string
 
+	// When set, builds etc/event-log-tags file by merging logtags from all dependencies.
+	// Default is false
+	Build_logtags *bool
+
 	Fsverity fsverityProperties
 }
 
@@ -295,6 +299,7 @@
 	f.buildNonDepsFiles(ctx, builder, rootDir)
 	f.addMakeBuiltFiles(ctx, builder, rootDir)
 	f.buildFsverityMetadataFiles(ctx, builder, specs, rootDir, rebasedDir)
+	f.buildEventLogtagsFile(ctx, builder, rebasedDir)
 
 	// run host_init_verifier
 	// Ideally we should have a concept of pluggable linters that verify the generated image.
@@ -435,6 +440,7 @@
 
 	f.buildNonDepsFiles(ctx, builder, rootDir)
 	f.buildFsverityMetadataFiles(ctx, builder, specs, rootDir, rebasedDir)
+	f.buildEventLogtagsFile(ctx, builder, rebasedDir)
 
 	output := android.PathForModuleOut(ctx, f.installFileName()).OutputPath
 	cmd := builder.Command().
@@ -492,6 +498,37 @@
 		Text(android.PathForArbitraryOutput(ctx, stagingDir).String())
 }
 
+func (f *filesystem) buildEventLogtagsFile(ctx android.ModuleContext, builder *android.RuleBuilder, rebasedDir android.OutputPath) {
+	if !proptools.Bool(f.properties.Build_logtags) {
+		return
+	}
+
+	logtagsFilePaths := make(map[string]bool)
+	ctx.WalkDeps(func(child, parent android.Module) bool {
+		if logtagsInfo, ok := android.OtherModuleProvider(ctx, child, android.LogtagsProviderKey); ok {
+			for _, path := range logtagsInfo.Logtags {
+				logtagsFilePaths[path.String()] = true
+			}
+		}
+		return true
+	})
+
+	if len(logtagsFilePaths) == 0 {
+		return
+	}
+
+	etcPath := rebasedDir.Join(ctx, "etc")
+	eventLogtagsPath := etcPath.Join(ctx, "event-log-tags")
+	builder.Command().Text("mkdir").Flag("-p").Text(etcPath.String())
+	cmd := builder.Command().BuiltTool("merge-event-log-tags").
+		FlagWithArg("-o ", eventLogtagsPath.String()).
+		FlagWithInput("-m ", android.MergedLogtagsPath(ctx))
+
+	for _, path := range android.SortedKeys(logtagsFilePaths) {
+		cmd.Text(path)
+	}
+}
+
 type partition interface {
 	PartitionType() string
 }
diff --git a/genrule/genrule.go b/genrule/genrule.go
index 43f4fe5..4ff82e6 100644
--- a/genrule/genrule.go
+++ b/genrule/genrule.go
@@ -714,13 +714,13 @@
 			rule := getSandboxedRuleBuilder(ctx, android.NewRuleBuilder(pctx, ctx).Sbox(genDir, nil))
 
 			for _, in := range shard {
-				outFile := android.GenPathWithExt(ctx, finalSubDir, in, String(properties.Output_extension))
+				outFile := android.GenPathWithExtAndTrimExt(ctx, finalSubDir, in, String(properties.Output_extension), String(properties.Trim_extension))
 
 				// If sharding is enabled, then outFile is the path to the output file in
 				// the shard directory, and copyTo is the path to the output file in the
 				// final directory.
 				if len(shards) > 1 {
-					shardFile := android.GenPathWithExt(ctx, genSubDir, in, String(properties.Output_extension))
+					shardFile := android.GenPathWithExtAndTrimExt(ctx, genSubDir, in, String(properties.Output_extension), String(properties.Trim_extension))
 					copyTo = append(copyTo, outFile)
 					outFile = shardFile
 				}
@@ -786,6 +786,9 @@
 
 	// Additional files needed for build that are not tooling related.
 	Data []string `android:"path"`
+
+	// Trim the matched extension for each input file, and it should start with ".".
+	Trim_extension *string
 }
 
 const defaultShardSize = 50
diff --git a/genrule/genrule_test.go b/genrule/genrule_test.go
index 2dc6a79..1df887b 100644
--- a/genrule/genrule_test.go
+++ b/genrule/genrule_test.go
@@ -894,6 +894,155 @@
 	)
 }
 
+func TestGenSrcsWithTrimExtAndOutpuExtension(t *testing.T) {
+	result := android.GroupFixturePreparers(
+		prepareForGenRuleTest,
+		android.FixtureMergeMockFs(android.MockFS{
+			"external-protos/path/Android.bp": []byte(`
+				filegroup {
+					name: "external-protos",
+					srcs: [
+					    "baz.a.b.c.proto/baz.a.b.c.proto",
+					    "bar.a.b.c.proto",
+					    "qux.ext.a.b.c.proto",
+					],
+				}
+			`),
+			"package-dir/Android.bp": []byte(`
+				gensrcs {
+					name: "module-name",
+					cmd: "mkdir -p $(genDir) && cat $(in) >> $(genDir)/$(out)",
+					srcs: [
+						"src/foo.a.b.c.proto",
+						":external-protos",
+					],
+
+					trim_extension: ".a.b.c.proto",
+					output_extension: "proto.h",
+				}
+			`),
+		}),
+	).RunTest(t)
+
+	exportedIncludeDir := "out/soong/.intermediates/package-dir/module-name/gen/gensrcs"
+	gen := result.Module("module-name", "").(*Module)
+
+	android.AssertPathsRelativeToTopEquals(
+		t,
+		"include path",
+		[]string{exportedIncludeDir},
+		gen.exportedIncludeDirs,
+	)
+	android.AssertPathsRelativeToTopEquals(
+		t,
+		"files",
+		[]string{
+			exportedIncludeDir + "/package-dir/src/foo.proto.h",
+			exportedIncludeDir + "/external-protos/path/baz.a.b.c.proto/baz.proto.h",
+			exportedIncludeDir + "/external-protos/path/bar.proto.h",
+			exportedIncludeDir + "/external-protos/path/qux.ext.proto.h",
+		},
+		gen.outputFiles,
+	)
+}
+
+func TestGenSrcsWithTrimExtButNoOutpuExtension(t *testing.T) {
+	result := android.GroupFixturePreparers(
+		prepareForGenRuleTest,
+		android.FixtureMergeMockFs(android.MockFS{
+			"external-protos/path/Android.bp": []byte(`
+				filegroup {
+					name: "external-protos",
+					srcs: [
+					    "baz.a.b.c.proto/baz.a.b.c.proto",
+					    "bar.a.b.c.proto",
+					    "qux.ext.a.b.c.proto",
+					],
+				}
+			`),
+			"package-dir/Android.bp": []byte(`
+				gensrcs {
+					name: "module-name",
+					cmd: "mkdir -p $(genDir) && cat $(in) >> $(genDir)/$(out)",
+					srcs: [
+						"src/foo.a.b.c.proto",
+						":external-protos",
+					],
+
+					trim_extension: ".a.b.c.proto",
+				}
+			`),
+		}),
+	).RunTest(t)
+
+	exportedIncludeDir := "out/soong/.intermediates/package-dir/module-name/gen/gensrcs"
+	gen := result.Module("module-name", "").(*Module)
+
+	android.AssertPathsRelativeToTopEquals(
+		t,
+		"include path",
+		[]string{exportedIncludeDir},
+		gen.exportedIncludeDirs,
+	)
+	android.AssertPathsRelativeToTopEquals(
+		t,
+		"files",
+		[]string{
+			exportedIncludeDir + "/package-dir/src/foo",
+			exportedIncludeDir + "/external-protos/path/baz.a.b.c.proto/baz",
+			exportedIncludeDir + "/external-protos/path/bar",
+			exportedIncludeDir + "/external-protos/path/qux.ext",
+		},
+		gen.outputFiles,
+	)
+}
+
+func TestGenSrcsWithOutpuExtension(t *testing.T) {
+	result := android.GroupFixturePreparers(
+		prepareForGenRuleTest,
+		android.FixtureMergeMockFs(android.MockFS{
+			"external-protos/path/Android.bp": []byte(`
+				filegroup {
+					name: "external-protos",
+					srcs: ["baz/baz.a.b.c.proto", "bar.a.b.c.proto"],
+				}
+			`),
+			"package-dir/Android.bp": []byte(`
+				gensrcs {
+					name: "module-name",
+					cmd: "mkdir -p $(genDir) && cat $(in) >> $(genDir)/$(out)",
+					srcs: [
+						"src/foo.a.b.c.proto",
+						":external-protos",
+					],
+
+					output_extension: "proto.h",
+				}
+			`),
+		}),
+	).RunTest(t)
+
+	exportedIncludeDir := "out/soong/.intermediates/package-dir/module-name/gen/gensrcs"
+	gen := result.Module("module-name", "").(*Module)
+
+	android.AssertPathsRelativeToTopEquals(
+		t,
+		"include path",
+		[]string{exportedIncludeDir},
+		gen.exportedIncludeDirs,
+	)
+	android.AssertPathsRelativeToTopEquals(
+		t,
+		"files",
+		[]string{
+			exportedIncludeDir + "/package-dir/src/foo.a.b.c.proto.h",
+			exportedIncludeDir + "/external-protos/path/baz/baz.a.b.c.proto.h",
+			exportedIncludeDir + "/external-protos/path/bar.a.b.c.proto.h",
+		},
+		gen.outputFiles,
+	)
+}
+
 func TestPrebuiltTool(t *testing.T) {
 	testcases := []struct {
 		name             string
diff --git a/java/aar_test.go b/java/aar_test.go
index d6dbe3c..18efd20 100644
--- a/java/aar_test.go
+++ b/java/aar_test.go
@@ -15,8 +15,9 @@
 package java
 
 import (
-	"android/soong/android"
 	"testing"
+
+	"android/soong/android"
 )
 
 func TestAarImportProducesJniPackages(t *testing.T) {
@@ -98,6 +99,7 @@
 		aconfig_declarations {
 			name: "bar",
 			package: "com.example.package.bar",
+			container: "com.android.foo",
 			srcs: [
 				"bar.aconfig",
 			],
@@ -105,6 +107,7 @@
 		aconfig_declarations {
 			name: "baz",
 			package: "com.example.package.baz",
+			container: "com.android.foo",
 			srcs: [
 				"baz.aconfig",
 			],
diff --git a/java/androidmk.go b/java/androidmk.go
index a52d439..9cd0baf 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -92,11 +92,7 @@
 			ExtraEntries: []android.AndroidMkExtraEntriesFunc{
 				func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
 					if len(library.logtagsSrcs) > 0 {
-						var logtags []string
-						for _, l := range library.logtagsSrcs {
-							logtags = append(logtags, l.Rel())
-						}
-						entries.AddStrings("LOCAL_LOGTAGS_FILES", logtags...)
+						entries.AddStrings("LOCAL_SOONG_LOGTAGS_FILES", library.logtagsSrcs.Strings()...)
 					}
 
 					if library.installFile == nil {
@@ -457,6 +453,8 @@
 				if app.Name() != "framework-res" {
 					android.SetAconfigFileMkEntries(&app.ModuleBase, entries, app.mergedAconfigFiles)
 				}
+
+				entries.AddStrings("LOCAL_SOONG_LOGTAGS_FILES", app.logtagsSrcs.Strings()...)
 			},
 		},
 		ExtraFooters: []android.AndroidMkExtraFootersFunc{
diff --git a/java/app_test.go b/java/app_test.go
index eab40e7..a7c48a1 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -4382,6 +4382,7 @@
 		aconfig_declarations {
 			name: "bar",
 			package: "com.example.package.bar",
+			container: "com.android.foo",
 			srcs: [
 				"bar.aconfig",
 			],
@@ -4389,6 +4390,7 @@
 		aconfig_declarations {
 			name: "baz",
 			package: "com.example.package.baz",
+			container: "com.android.foo",
 			srcs: [
 				"baz.aconfig",
 			],
diff --git a/java/classpath_fragment.go b/java/classpath_fragment.go
index 0ebab4d..07bc5c1 100644
--- a/java/classpath_fragment.go
+++ b/java/classpath_fragment.go
@@ -151,10 +151,14 @@
 	return jars
 }
 
+func (c *ClasspathFragmentBase) outputFilename() string {
+	return strings.ToLower(c.classpathType.String()) + ".pb"
+}
+
 func (c *ClasspathFragmentBase) generateClasspathProtoBuildActions(ctx android.ModuleContext, configuredJars android.ConfiguredJarList, jars []classpathJar) {
 	generateProto := proptools.BoolDefault(c.properties.Generate_classpaths_proto, true)
 	if generateProto {
-		outputFilename := strings.ToLower(c.classpathType.String()) + ".pb"
+		outputFilename := c.outputFilename()
 		c.outputFilepath = android.PathForModuleOut(ctx, outputFilename).OutputPath
 		c.installDirPath = android.PathForModuleInstall(ctx, "etc", "classpaths")
 
@@ -181,6 +185,10 @@
 	android.SetProvider(ctx, ClasspathFragmentProtoContentInfoProvider, classpathProtoInfo)
 }
 
+func (c *ClasspathFragmentBase) installClasspathProto(ctx android.ModuleContext) android.InstallPath {
+	return ctx.InstallFile(c.installDirPath, c.outputFilename(), c.outputFilepath)
+}
+
 func writeClasspathsTextproto(ctx android.ModuleContext, output android.WritablePath, jars []classpathJar) {
 	var content strings.Builder
 
diff --git a/java/droidstubs.go b/java/droidstubs.go
index 08caf91..730be14 100644
--- a/java/droidstubs.go
+++ b/java/droidstubs.go
@@ -604,6 +604,11 @@
 	}
 }
 
+// AndroidPlusUpdatableJar is the name of some extra jars added into `module-lib` and
+// `system-server` directories that contain all the APIs provided by the platform and updatable
+// modules because the `android.jar` files do not. See b/337836752.
+const AndroidPlusUpdatableJar = "android-plus-updatable.jar"
+
 func (d *Droidstubs) apiLevelsGenerationFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, stubsType StubsType, apiVersionsXml android.WritablePath) {
 	if len(d.properties.Api_levels_annotations_dirs) == 0 {
 		ctx.PropertyErrorf("api_levels_annotations_dirs",
@@ -621,7 +626,8 @@
 	// privileged apps that are only defined since API level 21 (Lollipop), fallback to public stubs
 	// for older releases. Similarly, module-lib falls back to system API.
 	var sdkDirs []string
-	switch proptools.StringDefault(d.properties.Api_levels_sdk_type, "public") {
+	apiLevelsSdkType := proptools.StringDefault(d.properties.Api_levels_sdk_type, "public")
+	switch apiLevelsSdkType {
 	case "system-server":
 		sdkDirs = []string{"system-server", "module-lib", "system", "public"}
 	case "module-lib":
@@ -635,9 +641,22 @@
 		return
 	}
 
+	// Construct a pattern to match the appropriate extensions that should be included in the
+	// generated api-versions.xml file.
+	//
 	// Use the first item in the sdkDirs array as that is the sdk type for the target API levels
 	// being generated but has the advantage over `Api_levels_sdk_type` as it has been validated.
-	extensionsPattern := fmt.Sprintf(`/extensions/[0-9]+/%s/.*\.jar`, sdkDirs[0])
+	// The exception is for system-server which needs to include module-lib and system-server. That
+	// is because while system-server extends module-lib the system-server extension directory only
+	// contains service-* modules which provide system-server APIs it does not list the modules which
+	// only provide a module-lib, so they have to be included separately.
+	extensionSurfacesPattern := sdkDirs[0]
+	if apiLevelsSdkType == "system-server" {
+		// Take the first two items in sdkDirs, which are system-server and module-lib, and construct
+		// a pattern that will match either.
+		extensionSurfacesPattern = strings.Join(sdkDirs[0:2], "|")
+	}
+	extensionsPattern := fmt.Sprintf(`/extensions/[0-9]+/(%s)/.*\.jar`, extensionSurfacesPattern)
 
 	var dirs []string
 	var extensions_dir string
@@ -648,16 +667,24 @@
 			// Grab the first extensions_dir and we find while scanning ExportedDroiddocDir.deps;
 			// ideally this should be read from prebuiltApis.properties.Extensions_*
 			for _, dep := range t.deps {
+				// Check to see if it matches an extension first.
+				depBase := dep.Base()
 				if extRegex.MatchString(dep.String()) && d.properties.Extensions_info_file != nil {
 					if extensions_dir == "" {
 						extensions_dir = t.dir.String() + "/extensions"
 					}
 					cmd.Implicit(dep)
-				}
-				if dep.Base() == filename {
+				} else if depBase == filename {
+					// Check to see if it matches a dessert release for an SDK, e.g. Android, Car, Wear, etc..
 					cmd.Implicit(dep)
-				}
-				if filename != "android.jar" && dep.Base() == "android.jar" {
+				} else if depBase == AndroidPlusUpdatableJar && d.properties.Extensions_info_file != nil {
+					// The output api-versions.xml has been requested to include information on SDK
+					// extensions. That means it also needs to include
+					// so
+					// The module-lib and system-server directories should use `android-plus-updatable.jar`
+					// instead of `android.jar`. See AndroidPlusUpdatableJar for more information.
+					cmd.Implicit(dep)
+				} else if filename != "android.jar" && depBase == "android.jar" {
 					// Metalava implicitly searches these patterns:
 					//  prebuilts/tools/common/api-versions/android-%/android.jar
 					//  prebuilts/sdk/%/public/android.jar
@@ -675,9 +702,25 @@
 		}
 	})
 
+	// Generate the list of --android-jar-pattern options. The order matters so the first one which
+	// matches will be the one that is used for a specific api level..
 	for _, sdkDir := range sdkDirs {
 		for _, dir := range dirs {
-			cmd.FlagWithArg("--android-jar-pattern ", fmt.Sprintf("%s/%%/%s/%s", dir, sdkDir, filename))
+			addPattern := func(jarFilename string) {
+				cmd.FlagWithArg("--android-jar-pattern ", fmt.Sprintf("%s/%%/%s/%s", dir, sdkDir, jarFilename))
+			}
+
+			if sdkDir == "module-lib" || sdkDir == "system-server" {
+				// The module-lib and system-server android.jars do not include the updatable modules (as
+				// doing so in the source would introduce dependency cycles and the prebuilts have to
+				// match the sources). So, instead an additional `android-plus-updatable.jar` will be used
+				// that does include the updatable modules and this pattern will match that. This pattern
+				// is added in addition to the following pattern to decouple this change from the change
+				// to add the `android-plus-updatable.jar`.
+				addPattern(AndroidPlusUpdatableJar)
+			}
+
+			addPattern(filename)
 		}
 	}
 
@@ -1327,7 +1370,7 @@
 // use a strict naming convention
 var (
 	droidstubsModuleNamingToSdkKind = map[string]android.SdkKind{
-		//public is commented out since the core libraries use public in their java_sdk_library names
+		// public is commented out since the core libraries use public in their java_sdk_library names
 		"intracore":     android.SdkIntraCore,
 		"intra.core":    android.SdkIntraCore,
 		"system_server": android.SdkSystemServer,
diff --git a/java/droidstubs_test.go b/java/droidstubs_test.go
index 8da695f..6a14f36 100644
--- a/java/droidstubs_test.go
+++ b/java/droidstubs_test.go
@@ -379,6 +379,7 @@
 	aconfig_declarations {
 		name: "bar",
 		package: "com.example.package",
+		container: "com.android.foo",
 		srcs: [
 			"bar.aconfig",
 		],
@@ -434,6 +435,7 @@
 	aconfig_declarations {
 		name: "bar",
 		package: "com.example.package",
+		container: "com.android.foo",
 		srcs: [
 			"bar.aconfig",
 		],
diff --git a/java/gen.go b/java/gen.go
index 68a9b53..1b4f4c7 100644
--- a/java/gen.go
+++ b/java/gen.go
@@ -27,7 +27,6 @@
 
 func init() {
 	pctx.SourcePathVariable("logtagsCmd", "build/make/tools/java-event-log-tags.py")
-	pctx.SourcePathVariable("mergeLogtagsCmd", "build/make/tools/merge-event-log-tags.py")
 	pctx.SourcePathVariable("logtagsLib", "build/make/tools/event_log_tags.py")
 }
 
@@ -37,12 +36,6 @@
 			Command:     "$logtagsCmd -o $out $in",
 			CommandDeps: []string{"$logtagsCmd", "$logtagsLib"},
 		})
-
-	mergeLogtags = pctx.AndroidStaticRule("mergeLogtags",
-		blueprint.RuleParams{
-			Command:     "$mergeLogtagsCmd -o $out $in",
-			CommandDeps: []string{"$mergeLogtagsCmd", "$logtagsLib"},
-		})
 )
 
 func genAidl(ctx android.ModuleContext, aidlFiles android.Paths, aidlGlobalFlags string, aidlIndividualFlags map[string]string, deps android.Paths) android.Paths {
@@ -178,37 +171,9 @@
 		outSrcFiles = append(outSrcFiles, srcJarFiles...)
 	}
 
+	android.SetProvider(ctx, android.LogtagsProviderKey, &android.LogtagsInfo{
+		Logtags: j.logtagsSrcs,
+	})
+
 	return outSrcFiles
 }
-
-func LogtagsSingleton() android.Singleton {
-	return &logtagsSingleton{}
-}
-
-type logtagsProducer interface {
-	logtags() android.Paths
-}
-
-func (j *Module) logtags() android.Paths {
-	return j.logtagsSrcs
-}
-
-var _ logtagsProducer = (*Module)(nil)
-
-type logtagsSingleton struct{}
-
-func (l *logtagsSingleton) GenerateBuildActions(ctx android.SingletonContext) {
-	var allLogtags android.Paths
-	ctx.VisitAllModules(func(module android.Module) {
-		if logtags, ok := module.(logtagsProducer); ok {
-			allLogtags = append(allLogtags, logtags.logtags()...)
-		}
-	})
-
-	ctx.Build(pctx, android.BuildParams{
-		Rule:        mergeLogtags,
-		Description: "merge logtags",
-		Output:      android.PathForIntermediates(ctx, "all-event-log-tags.txt"),
-		Inputs:      allLogtags,
-	})
-}
diff --git a/java/java.go b/java/java.go
index 725e25a..30581f2 100644
--- a/java/java.go
+++ b/java/java.go
@@ -75,7 +75,6 @@
 		ctx.BottomUp("jacoco_deps", jacocoDepsMutator).Parallel()
 	})
 
-	ctx.RegisterParallelSingletonType("logtags", LogtagsSingleton)
 	ctx.RegisterParallelSingletonType("kythe_java_extract", kytheExtractJavaFactory)
 }
 
diff --git a/java/java_test.go b/java/java_test.go
index a1192bb..2f27932 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -2801,6 +2801,7 @@
 	aconfig_declarations {
 		name: "bar",
 		package: "com.example.package",
+		container: "com.android.foo",
 		srcs: [
 			"bar.aconfig",
 		],
diff --git a/java/lint.go b/java/lint.go
index 31e7f35..82fac91 100644
--- a/java/lint.go
+++ b/java/lint.go
@@ -612,7 +612,7 @@
 		apiVersionsDb := findModuleOrErr(ctx, files.apiVersionsModule)
 		if apiVersionsDb == nil {
 			if !ctx.Config().AllowMissingDependencies() {
-				ctx.Errorf("lint: missing module api_versions_public")
+				ctx.Errorf("lint: missing module %s", files.apiVersionsModule)
 			}
 			return
 		}
@@ -620,7 +620,7 @@
 		sdkAnnotations := findModuleOrErr(ctx, files.annotationsModule)
 		if sdkAnnotations == nil {
 			if !ctx.Config().AllowMissingDependencies() {
-				ctx.Errorf("lint: missing module sdk-annotations.zip")
+				ctx.Errorf("lint: missing module %s", files.annotationsModule)
 			}
 			return
 		}
diff --git a/java/platform_bootclasspath.go b/java/platform_bootclasspath.go
index 4db426e..b3c9ce5 100644
--- a/java/platform_bootclasspath.go
+++ b/java/platform_bootclasspath.go
@@ -221,6 +221,7 @@
 	// ART and platform boot jars must have a corresponding entry in DEX2OATBOOTCLASSPATH
 	classpathJars := configuredJarListToClasspathJars(ctx, configuredJars, BOOTCLASSPATH, DEX2OATBOOTCLASSPATH)
 	b.classpathFragmentBase().generateClasspathProtoBuildActions(ctx, configuredJars, classpathJars)
+	b.classpathFragmentBase().installClasspathProto(ctx)
 }
 
 func (b *platformBootclasspathModule) configuredJars(ctx android.ModuleContext) android.ConfiguredJarList {
diff --git a/java/rro_test.go b/java/rro_test.go
index d697ec6..742c839 100644
--- a/java/rro_test.go
+++ b/java/rro_test.go
@@ -421,6 +421,7 @@
 		aconfig_declarations {
 			name: "bar",
 			package: "com.example.package.bar",
+			container: "com.android.foo",
 			srcs: [
 				"bar.aconfig",
 			],
@@ -428,6 +429,7 @@
 		aconfig_declarations {
 			name: "baz",
 			package: "com.example.package.baz",
+			container: "com.android.foo",
 			srcs: [
 				"baz.aconfig",
 			],
diff --git a/java/sdk_library_test.go b/java/sdk_library_test.go
index 0f163e6..34c63ac 100644
--- a/java/sdk_library_test.go
+++ b/java/sdk_library_test.go
@@ -1715,6 +1715,7 @@
 		aconfig_declarations {
 			name: "bar",
 			package: "com.example.package",
+			container: "com.android.foo",
 			srcs: [
 				"bar.aconfig",
 			],
diff --git a/java/systemserver_classpath_fragment.go b/java/systemserver_classpath_fragment.go
index b291e70..bad2cf1 100644
--- a/java/systemserver_classpath_fragment.go
+++ b/java/systemserver_classpath_fragment.go
@@ -69,6 +69,7 @@
 	configuredJars = configuredJars.AppendList(&standaloneConfiguredJars)
 	classpathJars = append(classpathJars, standaloneClasspathJars...)
 	p.classpathFragmentBase().generateClasspathProtoBuildActions(ctx, configuredJars, classpathJars)
+	p.classpathFragmentBase().installClasspathProto(ctx)
 }
 
 func (p *platformSystemServerClasspathModule) configuredJars(ctx android.ModuleContext) android.ConfiguredJarList {
diff --git a/rust/config/global.go b/rust/config/global.go
index ba08560..03333b8 100644
--- a/rust/config/global.go
+++ b/rust/config/global.go
@@ -53,6 +53,9 @@
 		"--color=always",
 		"-Z dylib-lto",
 		"-Z link-native-libraries=no",
+
+		// cfg flag to indicate that we are building in AOSP with Soong
+		"--cfg soong",
 	}
 
 	LinuxHostGlobalLinkFlags = []string{
diff --git a/rust/project_json.go b/rust/project_json.go
index ad9b690..05fc09b 100644
--- a/rust/project_json.go
+++ b/rust/project_json.go
@@ -96,7 +96,7 @@
 		var childId int
 		cInfo, known := singleton.knownCrates[rChild.Name()]
 		if !known {
-			childId, ok = singleton.addCrate(ctx, rChild, make(map[string]int))
+			childId, ok = singleton.addCrate(ctx, rChild)
 			if !ok {
 				return
 			}
@@ -128,7 +128,8 @@
 // addCrate adds a crate to singleton.project.Crates ensuring that required
 // dependencies are also added. It returns the index of the new crate in
 // singleton.project.Crates
-func (singleton *projectGeneratorSingleton) addCrate(ctx android.SingletonContext, rModule *Module, deps map[string]int) (int, bool) {
+func (singleton *projectGeneratorSingleton) addCrate(ctx android.SingletonContext, rModule *Module) (int, bool) {
+	deps := make(map[string]int)
 	rootModule, err := rModule.compiler.checkedCrateRootPath()
 	if err != nil {
 		return 0, false
@@ -180,7 +181,7 @@
 	if cInfo, ok := singleton.knownCrates[module.Name()]; ok {
 		// If we have a new device variant, override the old one
 		if !cInfo.Device && rModule.Device() {
-			singleton.addCrate(ctx, rModule, cInfo.Deps)
+			singleton.addCrate(ctx, rModule)
 			return
 		}
 		crate := singleton.project.Crates[cInfo.Idx]
@@ -188,7 +189,7 @@
 		singleton.project.Crates[cInfo.Idx] = crate
 		return
 	}
-	singleton.addCrate(ctx, rModule, make(map[string]int))
+	singleton.addCrate(ctx, rModule)
 }
 
 func (singleton *projectGeneratorSingleton) GenerateBuildActions(ctx android.SingletonContext) {
diff --git a/scripts/run-soong-tests-with-go-tools.sh b/scripts/run-soong-tests-with-go-tools.sh
index 93c622e..1fbb1fc 100755
--- a/scripts/run-soong-tests-with-go-tools.sh
+++ b/scripts/run-soong-tests-with-go-tools.sh
@@ -74,6 +74,6 @@
     (cd "$dir";
      eval ${network_jail} -- ${GOROOT}/bin/go build ./...
      eval ${network_jail} -- ${GOROOT}/bin/go test ./...
-     eval ${network_jail} -- ${GOROOT}/bin/go test -race -short ./...
+     eval ${network_jail} -- ${GOROOT}/bin/go test -race -timeout 20m -short ./...
     )
 done
diff --git a/ui/build/rbe.go b/ui/build/rbe.go
index 5142a41..8fa147f 100644
--- a/ui/build/rbe.go
+++ b/ui/build/rbe.go
@@ -159,12 +159,6 @@
 		fmt.Fprintln(ctx.Writer, "")
 		return
 	}
-	if config.GoogleProdCredsExist() {
-		return
-	}
-	fmt.Fprintln(ctx.Writer, "")
-	fmt.Fprintln(ctx.Writer, "\033[33mWARNING: Missing LOAS credentials, please run `gcert`. This is required for a successful build execution. See go/rbe-android-default-announcement for more information.\033[0m")
-	fmt.Fprintln(ctx.Writer, "")
 }
 
 // DumpRBEMetrics creates a metrics protobuf file containing RBE related metrics.