diff --git a/aconfig/codegen/cc_aconfig_library_test.go b/aconfig/codegen/cc_aconfig_library_test.go
index d01d13b..2f6c1a6 100644
--- a/aconfig/codegen/cc_aconfig_library_test.go
+++ b/aconfig/codegen/cc_aconfig_library_test.go
@@ -74,11 +74,6 @@
     		srcs: ["libaconfig_storage_read_api_cc.cc"],
 			}
 
-			cc_library {
-    		name: "libaconfig_storage_protos_cc",
-    		srcs: ["libaconfig_storage_protos_cc.cc"],
-			}
-
 			cc_aconfig_library {
 				name: "my_cc_aconfig_library",
 				aconfig_declarations: "my_aconfig_declarations",
@@ -137,12 +132,6 @@
     		srcs: ["libaconfig_storage_read_api_cc.cc"],
 			}
 
-			cc_library {
-    		name: "libaconfig_storage_protos_cc",
-    		srcs: ["libaconfig_storage_protos_cc.cc"],
-			}
-
-
 			cc_aconfig_library {
 				name: "my_cc_aconfig_library",
 				aconfig_declarations: "my_aconfig_declarations",
@@ -214,12 +203,6 @@
 			srcs: ["libaconfig_storage_read_api_cc.cc"],
 			vendor_available: true,
 		}
-
-		cc_library {
-			name: "libaconfig_storage_protos_cc",
-			srcs: ["libaconfig_storage_protos_cc.cc"],
-			vendor_available: true,
-		}
 	`
 	result := android.GroupFixturePreparers(
 		PrepareForTestWithAconfigBuildComponents,
diff --git a/android/apex.go b/android/apex.go
index fcbd13e..2ac6ed0 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -350,7 +350,8 @@
 // ApexModuleBase provides the default implementation for the ApexModule interface. APEX-aware
 // modules are expected to include this struct and call InitApexModule().
 type ApexModuleBase struct {
-	ApexProperties ApexProperties
+	ApexProperties     ApexProperties
+	apexPropertiesLock sync.Mutex // protects ApexProperties during parallel apexDirectlyInAnyMutator
 
 	canHaveApexVariants bool
 
@@ -761,18 +762,22 @@
 
 // UpdateDirectlyInAnyApex uses the final module to store if any variant of this module is directly
 // in any APEX, and then copies the final value to all the modules. It also copies the
-// DirectlyInAnyApex value to any direct dependencies with a CopyDirectlyInAnyApexTag dependency
-// tag.
+// DirectlyInAnyApex value to any transitive dependencies with a CopyDirectlyInAnyApexTag
+// dependency tag.
 func UpdateDirectlyInAnyApex(mctx BottomUpMutatorContext, am ApexModule) {
 	base := am.apexModuleBase()
-	// Copy DirectlyInAnyApex and InAnyApex from any direct dependencies with a
+	// Copy DirectlyInAnyApex and InAnyApex from any transitive dependencies with a
 	// CopyDirectlyInAnyApexTag dependency tag.
-	mctx.VisitDirectDeps(func(dep Module) {
-		if _, ok := mctx.OtherModuleDependencyTag(dep).(CopyDirectlyInAnyApexTag); ok {
-			depBase := dep.(ApexModule).apexModuleBase()
+	mctx.WalkDeps(func(child, parent Module) bool {
+		if _, ok := mctx.OtherModuleDependencyTag(child).(CopyDirectlyInAnyApexTag); ok {
+			depBase := child.(ApexModule).apexModuleBase()
+			depBase.apexPropertiesLock.Lock()
+			defer depBase.apexPropertiesLock.Unlock()
 			depBase.ApexProperties.DirectlyInAnyApex = base.ApexProperties.DirectlyInAnyApex
 			depBase.ApexProperties.InAnyApex = base.ApexProperties.InAnyApex
+			return true
 		}
+		return false
 	})
 
 	if base.ApexProperties.DirectlyInAnyApex {
diff --git a/android/config.go b/android/config.go
index 76c590a..6007451 100644
--- a/android/config.go
+++ b/android/config.go
@@ -827,6 +827,10 @@
 	return value == "0" || value == "n" || value == "no" || value == "off" || value == "false"
 }
 
+func (c *config) TargetsJava21() bool {
+	return c.IsEnvTrue("EXPERIMENTAL_TARGET_JAVA_VERSION_21")
+}
+
 // EnvDeps returns the environment variables this build depends on. The first
 // call to this function blocks future reads from the environment.
 func (c *config) EnvDeps() map[string]string {
diff --git a/android/selects_test.go b/android/selects_test.go
index 42a8941..6f980ce 100644
--- a/android/selects_test.go
+++ b/android/selects_test.go
@@ -546,6 +546,24 @@
 			},
 		},
 		{
+			name: "Unhandled string value",
+			bp: `
+			my_module_type {
+				name: "foo",
+				my_string: select(soong_config_variable("my_namespace", "my_variable"), {
+					"foo": "a",
+					"bar": "b",
+				}),
+			}
+			`,
+			vendorVars: map[string]map[string]string{
+				"my_namespace": {
+					"my_variable": "baz",
+				},
+			},
+			expectedError: `my_string: soong_config_variable\("my_namespace", "my_variable"\) had value "baz", which was not handled by the select statement`,
+		},
+		{
 			name: "Select on boolean",
 			bp: `
 			my_module_type {
@@ -596,7 +614,7 @@
 				}),
 			}
 			`,
-			expectedError: "foo",
+			expectedError: `my_string: boolean_var_for_testing\(\) had value undefined, which was not handled by the select statement`,
 		},
 		{
 			name: "Select on boolean undefined with default",
@@ -711,6 +729,55 @@
 				},
 			},
 		},
+		{
+			name: "Soong config value variable on configurable property",
+			bp: `
+			soong_config_module_type {
+				name: "soong_config_my_module_type",
+				module_type: "my_module_type",
+				config_namespace: "my_namespace",
+				value_variables: ["my_variable"],
+				properties: ["my_string", "my_string_list"],
+			}
+
+			soong_config_my_module_type {
+				name: "foo",
+				my_string_list: ["before.cpp"],
+				soong_config_variables: {
+					my_variable: {
+						my_string_list: ["after_%s.cpp"],
+						my_string: "%s.cpp",
+					},
+				},
+			}
+			`,
+			provider: selectsTestProvider{
+				my_string:      proptools.StringPtr("foo.cpp"),
+				my_string_list: &[]string{"before.cpp", "after_foo.cpp"},
+			},
+			vendorVars: map[string]map[string]string{
+				"my_namespace": {
+					"my_variable": "foo",
+				},
+			},
+		},
+		{
+			name: "Property appending with variable",
+			bp: `
+			my_variable = ["b.cpp"]
+			my_module_type {
+				name: "foo",
+				my_string_list: ["a.cpp"] + my_variable + select(soong_config_variable("my_namespace", "my_variable"), {
+					"a": ["a.cpp"],
+					"b": ["b.cpp"],
+					default: ["c.cpp"],
+				}),
+			}
+			`,
+			provider: selectsTestProvider{
+				my_string_list: &[]string{"a.cpp", "b.cpp", "c.cpp"},
+			},
+		},
 	}
 
 	for _, tc := range testCases {
@@ -718,6 +785,7 @@
 			fixtures := GroupFixturePreparers(
 				PrepareForTestWithDefaults,
 				PrepareForTestWithArchMutator,
+				PrepareForTestWithSoongConfigModuleBuildComponents,
 				FixtureRegisterWithContext(func(ctx RegistrationContext) {
 					ctx.RegisterModuleType("my_module_type", newSelectsMockModule)
 					ctx.RegisterModuleType("my_defaults", newSelectsMockModuleDefaults)
@@ -772,7 +840,7 @@
 		myStringStr = *p.my_string
 	}
 	myNonconfigurableStringStr := "nil"
-	if p.my_string != nil {
+	if p.my_nonconfigurable_string != nil {
 		myNonconfigurableStringStr = *p.my_nonconfigurable_string
 	}
 	return fmt.Sprintf(`selectsTestProvider {
diff --git a/android/soongconfig/modules.go b/android/soongconfig/modules.go
index c910974..87af774 100644
--- a/android/soongconfig/modules.go
+++ b/android/soongconfig/modules.go
@@ -733,11 +733,18 @@
 		case reflect.Bool:
 			// Nothing to do
 		case reflect.Struct:
-			fieldName = append(fieldName, propStruct.Type().Field(i).Name)
-			if err := s.printfIntoPropertyRecursive(fieldName, field, configValue); err != nil {
-				return err
+			if proptools.IsConfigurable(field.Type()) {
+				if err := proptools.PrintfIntoConfigurable(field.Interface(), configValue); err != nil {
+					fieldName = append(fieldName, propStruct.Type().Field(i).Name)
+					return fmt.Errorf("soong_config_variables.%s.%s: %s", s.variable, strings.Join(fieldName, "."), err)
+				}
+			} else {
+				fieldName = append(fieldName, propStruct.Type().Field(i).Name)
+				if err := s.printfIntoPropertyRecursive(fieldName, field, configValue); err != nil {
+					return err
+				}
+				fieldName = fieldName[:len(fieldName)-1]
 			}
-			fieldName = fieldName[:len(fieldName)-1]
 		default:
 			fieldName = append(fieldName, propStruct.Type().Field(i).Name)
 			return fmt.Errorf("soong_config_variables.%s.%s: unsupported property type %q", s.variable, strings.Join(fieldName, "."), kind)
diff --git a/android/variable.go b/android/variable.go
index a3fdafb..684aab0 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -181,8 +181,9 @@
 		// release_aidl_use_unfrozen is "true" when a device can
 		// use the unfrozen versions of AIDL interfaces.
 		Release_aidl_use_unfrozen struct {
-			Cflags []string
-			Cmd    *string
+			Cflags          []string
+			Cmd             *string
+			Vintf_fragments []string
 		}
 	} `android:"arch_variant"`
 }
diff --git a/apex/aconfig_test.go b/apex/aconfig_test.go
index 726041c..14c0b63 100644
--- a/apex/aconfig_test.go
+++ b/apex/aconfig_test.go
@@ -23,6 +23,7 @@
 	"android/soong/genrule"
 	"android/soong/java"
 	"android/soong/rust"
+
 	"github.com/google/blueprint/proptools"
 )
 
@@ -173,10 +174,6 @@
 					name: "libaconfig_storage_read_api_cc",
 					srcs: ["libaconfig_storage_read_api_cc.cc"],
 				}
-				cc_library {
-					name: "libaconfig_storage_protos_cc",
-					srcs: ["libaconfig_storage_protos_cc.cc"],
-				}
 				aconfig_declarations {
 					name: "my_aconfig_declarations_bar",
 					package: "com.example.package",
@@ -436,10 +433,6 @@
 					name: "libaconfig_storage_read_api_cc",
 					srcs: ["libaconfig_storage_read_api_cc.cc"],
 				}
-				cc_library {
-					name: "libaconfig_storage_protos_cc",
-					srcs: ["libaconfig_storage_protos_cc.cc"],
-				}
 				aconfig_declarations {
 					name: "my_aconfig_declarations_foo",
 					package: "com.example.package",
@@ -501,10 +494,6 @@
 					name: "libaconfig_storage_read_api_cc",
 					srcs: ["libaconfig_storage_read_api_cc.cc"],
 				}
-				cc_library {
-					name: "libaconfig_storage_protos_cc",
-					srcs: ["libaconfig_storage_protos_cc.cc"],
-				}
 				aconfig_declarations {
 					name: "my_aconfig_declarations_foo",
 					package: "com.example.package",
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 965b4be..4cac0cc 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -10709,10 +10709,6 @@
 			name: "libaconfig_storage_read_api_cc",
 			srcs: ["libaconfig_storage_read_api_cc.cc"],
 		}
-		cc_library {
-			name: "libaconfig_storage_protos_cc",
-			srcs: ["libaconfig_storage_protos_cc.cc"],
-		}
 	`)
 
 	mod := ctx.ModuleForTests("myapex", "android_common_myapex")
diff --git a/apex/platform_bootclasspath_test.go b/apex/platform_bootclasspath_test.go
index 9f1e1e1..4a20cf0 100644
--- a/apex/platform_bootclasspath_test.go
+++ b/apex/platform_bootclasspath_test.go
@@ -865,6 +865,36 @@
 			},
 		}
 
+		// Another prebuilt apex, but this is not selected during the build.
+		prebuilt_apex {
+			name: "com.google.android.myapex.v2", // mainline prebuilt selection logic in soong relies on the naming convention com.google.android
+			apex_name: "myapex",
+			source_apex_name: "myapex",
+			src: "myapex.apex",
+			exported_bootclasspath_fragments: ["apex-fragment.v2"],
+		}
+
+		java_import {
+			name: "bar",
+			jars: ["bar.jar"],
+			apex_available: ["myapex"],
+			permitted_packages: ["bar"],
+		}
+
+		prebuilt_bootclasspath_fragment {
+			name: "apex-fragment.v2",
+			contents: ["bar"], // Unlike the source fragment, this is missing foo
+			apex_available:[ "myapex" ],
+			hidden_api: {
+				annotation_flags: "my-bootclasspath-fragment/annotation-flags.csv",
+				metadata: "my-bootclasspath-fragment/metadata.csv",
+				index: "my-bootclasspath-fragment/index.csv",
+				stub_flags: "my-bootclasspath-fragment/stub-flags.csv",
+				all_flags: "my-bootclasspath-fragment/all-flags.csv",
+			},
+		}
+
+
 		apex_contributions {
 			name: "my_apex_contributions",
 			api_domain: "myapex",
diff --git a/apex/prebuilt.go b/apex/prebuilt.go
index b2afa39..9ad5159 100644
--- a/apex/prebuilt.go
+++ b/apex/prebuilt.go
@@ -848,7 +848,9 @@
 
 func (p *Prebuilt) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	// Validate contents of classpath fragments
-	validateApexClasspathFragments(ctx)
+	if !p.IsHideFromMake() {
+		validateApexClasspathFragments(ctx)
+	}
 
 	p.apexKeysPath = writeApexKeys(ctx, p)
 	// TODO(jungjw): Check the key validity.
@@ -1074,7 +1076,9 @@
 
 func (a *ApexSet) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	// Validate contents of classpath fragments
-	validateApexClasspathFragments(ctx)
+	if !a.IsHideFromMake() {
+		validateApexClasspathFragments(ctx)
+	}
 
 	a.apexKeysPath = writeApexKeys(ctx, a)
 	a.installFilename = a.InstallFilename()
diff --git a/cc/builder.go b/cc/builder.go
index d817d82..7a3394a 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -638,7 +638,7 @@
 		ccCmd = "${config.ClangBin}/" + ccCmd
 
 		if flags.clangVerify {
-			postCmd = " && touch $$out"
+			postCmd = " && touch " + objFile.String()
 		}
 
 		var implicitOutputs android.WritablePaths
diff --git a/cc/config/toolchain.go b/cc/config/toolchain.go
index 7dc990b..5d8c351 100644
--- a/cc/config/toolchain.go
+++ b/cc/config/toolchain.go
@@ -209,58 +209,58 @@
 	return list
 }
 
-func LibclangRuntimeLibrary(t Toolchain, library string) string {
+func LibclangRuntimeLibrary(library string) string {
 	return "libclang_rt." + library
 }
 
-func BuiltinsRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "builtins")
+func BuiltinsRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("builtins")
 }
 
-func AddressSanitizerRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "asan")
+func AddressSanitizerRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("asan")
 }
 
-func AddressSanitizerStaticRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "asan.static")
+func AddressSanitizerStaticRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("asan.static")
 }
 
-func AddressSanitizerCXXStaticRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "asan_cxx.static")
+func AddressSanitizerCXXStaticRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("asan_cxx.static")
 }
 
-func HWAddressSanitizerRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "hwasan")
+func HWAddressSanitizerRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("hwasan")
 }
 
-func HWAddressSanitizerStaticLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "hwasan_static")
+func HWAddressSanitizerStaticLibrary() string {
+	return LibclangRuntimeLibrary("hwasan_static")
 }
 
-func UndefinedBehaviorSanitizerRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "ubsan_standalone")
+func UndefinedBehaviorSanitizerRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("ubsan_standalone")
 }
 
-func UndefinedBehaviorSanitizerMinimalRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "ubsan_minimal")
+func UndefinedBehaviorSanitizerMinimalRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("ubsan_minimal")
 }
 
-func ThreadSanitizerRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "tsan")
+func ThreadSanitizerRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("tsan")
 }
 
-func ScudoRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "scudo")
+func ScudoRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("scudo")
 }
 
-func ScudoMinimalRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "scudo_minimal")
+func ScudoMinimalRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("scudo_minimal")
 }
 
-func LibFuzzerRuntimeLibrary(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "fuzzer")
+func LibFuzzerRuntimeLibrary() string {
+	return LibclangRuntimeLibrary("fuzzer")
 }
 
-func LibFuzzerRuntimeInterceptors(t Toolchain) string {
-	return LibclangRuntimeLibrary(t, "fuzzer_interceptors")
+func LibFuzzerRuntimeInterceptors() string {
+	return LibclangRuntimeLibrary("fuzzer_interceptors")
 }
diff --git a/cc/fuzz.go b/cc/fuzz.go
index 164ec99..92f2c5e 100644
--- a/cc/fuzz.go
+++ b/cc/fuzz.go
@@ -128,13 +128,13 @@
 	if ctx.Config().Getenv("FUZZ_FRAMEWORK") == "AFL" {
 		deps.HeaderLibs = append(deps.HeaderLibs, "libafl_headers")
 	} else {
-		deps.StaticLibs = append(deps.StaticLibs, config.LibFuzzerRuntimeLibrary(ctx.toolchain()))
+		deps.StaticLibs = append(deps.StaticLibs, config.LibFuzzerRuntimeLibrary())
 		// Fuzzers built with HWASAN should use the interceptors for better
 		// mutation based on signals in strcmp, memcpy, etc. This is only needed for
 		// fuzz targets, not generic HWASAN-ified binaries or libraries.
 		if module, ok := ctx.Module().(*Module); ok {
 			if module.IsSanitizerEnabled(Hwasan) {
-				deps.StaticLibs = append(deps.StaticLibs, config.LibFuzzerRuntimeInterceptors(ctx.toolchain()))
+				deps.StaticLibs = append(deps.StaticLibs, config.LibFuzzerRuntimeInterceptors())
 			}
 		}
 	}
diff --git a/cc/linker.go b/cc/linker.go
index f325c12..1b5a33a 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -431,7 +431,7 @@
 	if ctx.toolchain().Bionic() {
 		// libclang_rt.builtins has to be last on the command line
 		if linker.Properties.libCrt() && !ctx.header() {
-			deps.UnexportedStaticLibs = append(deps.UnexportedStaticLibs, config.BuiltinsRuntimeLibrary(ctx.toolchain()))
+			deps.UnexportedStaticLibs = append(deps.UnexportedStaticLibs, config.BuiltinsRuntimeLibrary())
 		}
 
 		if inList("libdl", deps.SharedLibs) {
@@ -454,7 +454,7 @@
 		}
 	} else if ctx.toolchain().Musl() {
 		if linker.Properties.libCrt() && !ctx.header() {
-			deps.UnexportedStaticLibs = append(deps.UnexportedStaticLibs, config.BuiltinsRuntimeLibrary(ctx.toolchain()))
+			deps.UnexportedStaticLibs = append(deps.UnexportedStaticLibs, config.BuiltinsRuntimeLibrary())
 		}
 	}
 
diff --git a/cc/makevars.go b/cc/makevars.go
index 51bcbf0..9d29aff 100644
--- a/cc/makevars.go
+++ b/cc/makevars.go
@@ -28,6 +28,16 @@
 	modulesWarningsAllowedKey    = android.NewOnceKey("ModulesWarningsAllowed")
 	modulesUsingWnoErrorKey      = android.NewOnceKey("ModulesUsingWnoError")
 	modulesMissingProfileFileKey = android.NewOnceKey("ModulesMissingProfileFile")
+	sanitizerVariables           = map[string]string{
+		"ADDRESS_SANITIZER_RUNTIME_LIBRARY":   config.AddressSanitizerRuntimeLibrary(),
+		"HWADDRESS_SANITIZER_RUNTIME_LIBRARY": config.HWAddressSanitizerRuntimeLibrary(),
+		"HWADDRESS_SANITIZER_STATIC_LIBRARY":  config.HWAddressSanitizerStaticLibrary(),
+		"UBSAN_RUNTIME_LIBRARY":               config.UndefinedBehaviorSanitizerRuntimeLibrary(),
+		"UBSAN_MINIMAL_RUNTIME_LIBRARY":       config.UndefinedBehaviorSanitizerMinimalRuntimeLibrary(),
+		"TSAN_RUNTIME_LIBRARY":                config.ThreadSanitizerRuntimeLibrary(),
+		"SCUDO_RUNTIME_LIBRARY":               config.ScudoRuntimeLibrary(),
+		"SCUDO_MINIMAL_RUNTIME_LIBRARY":       config.ScudoMinimalRuntimeLibrary(),
+	}
 )
 
 func init() {
@@ -261,43 +271,9 @@
 	}, " "))
 
 	if target.Os.Class == android.Device {
-		sanitizerVariables := map[string]string{
-			"ADDRESS_SANITIZER_RUNTIME_LIBRARY":   config.AddressSanitizerRuntimeLibrary(toolchain),
-			"HWADDRESS_SANITIZER_RUNTIME_LIBRARY": config.HWAddressSanitizerRuntimeLibrary(toolchain),
-			"HWADDRESS_SANITIZER_STATIC_LIBRARY":  config.HWAddressSanitizerStaticLibrary(toolchain),
-			"UBSAN_RUNTIME_LIBRARY":               config.UndefinedBehaviorSanitizerRuntimeLibrary(toolchain),
-			"UBSAN_MINIMAL_RUNTIME_LIBRARY":       config.UndefinedBehaviorSanitizerMinimalRuntimeLibrary(toolchain),
-			"TSAN_RUNTIME_LIBRARY":                config.ThreadSanitizerRuntimeLibrary(toolchain),
-			"SCUDO_RUNTIME_LIBRARY":               config.ScudoRuntimeLibrary(toolchain),
-			"SCUDO_MINIMAL_RUNTIME_LIBRARY":       config.ScudoMinimalRuntimeLibrary(toolchain),
-		}
-
 		for variable, value := range sanitizerVariables {
 			ctx.Strict(secondPrefix+variable, value)
 		}
-
-		sanitizerLibs := android.SortedStringValues(sanitizerVariables)
-		var sanitizerLibStems []string
-		ctx.VisitAllModules(func(m android.Module) {
-			if !m.Enabled(ctx) {
-				return
-			}
-
-			ccModule, _ := m.(*Module)
-			if ccModule == nil || ccModule.library == nil || !ccModule.library.shared() {
-				return
-			}
-
-			if android.InList(strings.TrimPrefix(ctx.ModuleName(m), "prebuilt_"), sanitizerLibs) &&
-				m.Target().Os == target.Os && m.Target().Arch.ArchType == target.Arch.ArchType {
-				outputFile := ccModule.outputFile
-				if outputFile.Valid() {
-					sanitizerLibStems = append(sanitizerLibStems, outputFile.Path().Base())
-				}
-			}
-		})
-		sanitizerLibStems = android.SortedUniqueStrings(sanitizerLibStems)
-		ctx.Strict(secondPrefix+"SANITIZER_STEMS", strings.Join(sanitizerLibStems, " "))
 	}
 
 	// This is used by external/gentoo/...
diff --git a/cc/sanitize.go b/cc/sanitize.go
index 1a94729..e6075ad 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -25,6 +25,7 @@
 
 	"android/soong/android"
 	"android/soong/cc/config"
+	"android/soong/etc"
 )
 
 var (
@@ -408,6 +409,8 @@
 	android.RegisterMakeVarsProvider(pctx, cfiMakeVarsProvider)
 	android.RegisterMakeVarsProvider(pctx, hwasanMakeVarsProvider)
 	android.RegisterMakeVarsProvider(pctx, memtagStackMakeVarsProvider)
+
+	RegisterSanitizerLibrariesTxtType(android.InitRegistrationContext)
 }
 
 func (sanitize *sanitize) props() []interface{} {
@@ -1316,7 +1319,7 @@
 				} 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());
+					memtagStackStaticLibs(mctx.Config()).add(c, c.Module().Name())
 				}
 			}
 		} else if c.IsSanitizerEnabled(s.sanitizer) {
@@ -1522,25 +1525,25 @@
 		if Bool(sanProps.Address) {
 			if toolchain.Musl() || (c.staticBinary() && toolchain.Bionic()) {
 				// Use a static runtime for musl to match what clang does for glibc.
-				addStaticDeps(config.AddressSanitizerStaticRuntimeLibrary(toolchain), false)
-				addStaticDeps(config.AddressSanitizerCXXStaticRuntimeLibrary(toolchain), false)
+				addStaticDeps(config.AddressSanitizerStaticRuntimeLibrary(), false)
+				addStaticDeps(config.AddressSanitizerCXXStaticRuntimeLibrary(), false)
 			} else {
-				runtimeSharedLibrary = config.AddressSanitizerRuntimeLibrary(toolchain)
+				runtimeSharedLibrary = config.AddressSanitizerRuntimeLibrary()
 			}
 		} else if Bool(sanProps.Hwaddress) {
 			if c.staticBinary() {
-				addStaticDeps(config.HWAddressSanitizerStaticLibrary(toolchain), true)
+				addStaticDeps(config.HWAddressSanitizerStaticLibrary(), true)
 				addStaticDeps("libdl", false)
 			} else {
-				runtimeSharedLibrary = config.HWAddressSanitizerRuntimeLibrary(toolchain)
+				runtimeSharedLibrary = config.HWAddressSanitizerRuntimeLibrary()
 			}
 		} else if Bool(sanProps.Thread) {
-			runtimeSharedLibrary = config.ThreadSanitizerRuntimeLibrary(toolchain)
+			runtimeSharedLibrary = config.ThreadSanitizerRuntimeLibrary()
 		} else if Bool(sanProps.Scudo) {
 			if len(diagSanitizers) == 0 && !c.sanitize.Properties.UbsanRuntimeDep {
-				runtimeSharedLibrary = config.ScudoMinimalRuntimeLibrary(toolchain)
+				runtimeSharedLibrary = config.ScudoMinimalRuntimeLibrary()
 			} else {
-				runtimeSharedLibrary = config.ScudoRuntimeLibrary(toolchain)
+				runtimeSharedLibrary = config.ScudoRuntimeLibrary()
 			}
 		} else if len(diagSanitizers) > 0 || c.sanitize.Properties.UbsanRuntimeDep ||
 			Bool(sanProps.Fuzzer) ||
@@ -1553,17 +1556,17 @@
 				// Also manually add a static runtime for musl to match what clang does for glibc.
 				// Otherwise dlopening libraries that depend on libclang_rt.ubsan_standalone.so fails with:
 				// Error relocating ...: initial-exec TLS resolves to dynamic definition
-				addStaticDeps(config.UndefinedBehaviorSanitizerRuntimeLibrary(toolchain)+".static", true)
+				addStaticDeps(config.UndefinedBehaviorSanitizerRuntimeLibrary()+".static", true)
 			} else {
-				runtimeSharedLibrary = config.UndefinedBehaviorSanitizerRuntimeLibrary(toolchain)
+				runtimeSharedLibrary = config.UndefinedBehaviorSanitizerRuntimeLibrary()
 			}
 		}
 
 		if enableMinimalRuntime(c.sanitize) || c.sanitize.Properties.MinimalRuntimeDep {
-			addStaticDeps(config.UndefinedBehaviorSanitizerMinimalRuntimeLibrary(toolchain), true)
+			addStaticDeps(config.UndefinedBehaviorSanitizerMinimalRuntimeLibrary(), true)
 		}
 		if c.sanitize.Properties.BuiltinsDep {
-			addStaticDeps(config.BuiltinsRuntimeLibrary(toolchain), true)
+			addStaticDeps(config.BuiltinsRuntimeLibrary(), true)
 		}
 
 		if runtimeSharedLibrary != "" && (toolchain.Bionic() || toolchain.Musl()) {
@@ -1787,3 +1790,126 @@
 func memtagStackMakeVarsProvider(ctx android.MakeVarsContext) {
 	memtagStackStaticLibs(ctx.Config()).exportToMake(ctx)
 }
+
+type sanitizerLibrariesTxtModule struct {
+	android.ModuleBase
+
+	outputFile android.OutputPath
+}
+
+var _ etc.PrebuiltEtcModule = (*sanitizerLibrariesTxtModule)(nil)
+var _ android.OutputFileProducer = (*sanitizerLibrariesTxtModule)(nil)
+
+func RegisterSanitizerLibrariesTxtType(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("sanitizer_libraries_txt", sanitizerLibrariesTxtFactory)
+}
+
+func sanitizerLibrariesTxtFactory() android.Module {
+	m := &sanitizerLibrariesTxtModule{}
+	android.InitAndroidArchModule(m, android.DeviceSupported, android.MultilibCommon)
+	return m
+}
+
+type sanitizerLibraryDependencyTag struct {
+	blueprint.BaseDependencyTag
+}
+
+func (t sanitizerLibraryDependencyTag) AllowDisabledModuleDependency(target android.Module) bool {
+	return true
+}
+
+var _ android.AllowDisabledModuleDependency = (*sanitizerLibraryDependencyTag)(nil)
+
+func (txt *sanitizerLibrariesTxtModule) DepsMutator(actx android.BottomUpMutatorContext) {
+	targets := actx.Config().Targets[android.Android]
+	depTag := sanitizerLibraryDependencyTag{}
+
+	for _, target := range targets {
+		variation := append(target.Variations(),
+			blueprint.Variation{Mutator: "image", Variation: ""},
+			blueprint.Variation{Mutator: "sdk", Variation: ""},
+			blueprint.Variation{Mutator: "link", Variation: "shared"},
+		)
+		for _, lib := range android.SortedStringValues(sanitizerVariables) {
+			if actx.OtherModuleFarDependencyVariantExists(variation, lib) {
+				actx.AddFarVariationDependencies(variation, depTag, lib)
+			}
+
+			prebuiltLibName := "prebuilt_" + lib
+			if actx.OtherModuleFarDependencyVariantExists(variation, prebuiltLibName) {
+				actx.AddFarVariationDependencies(variation, depTag, prebuiltLibName)
+			}
+		}
+	}
+
+}
+
+func (txt *sanitizerLibrariesTxtModule) getSanitizerLibs(ctx android.ModuleContext) string {
+	var sanitizerLibStems []string
+
+	ctx.VisitDirectDepsIf(func(m android.Module) bool {
+		if !m.Enabled(ctx) {
+			return false
+		}
+
+		ccModule, _ := m.(*Module)
+		if ccModule == nil || ccModule.library == nil || !ccModule.library.shared() {
+			return false
+		}
+
+		targets := ctx.Config().Targets[android.Android]
+
+		for _, target := range targets {
+			if m.Target().Os == target.Os && m.Target().Arch.ArchType == target.Arch.ArchType {
+				return true
+			}
+		}
+
+		return false
+	}, func(m android.Module) {
+		ccModule, _ := m.(*Module)
+		outputFile := ccModule.outputFile
+		if outputFile.Valid() {
+			sanitizerLibStems = append(sanitizerLibStems, outputFile.Path().Base())
+		}
+	})
+
+	sanitizerLibStems = android.SortedUniqueStrings(sanitizerLibStems)
+	return strings.Join(sanitizerLibStems, "\n")
+}
+
+func (txt *sanitizerLibrariesTxtModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+	filename := txt.Name()
+
+	txt.outputFile = android.PathForModuleOut(ctx, filename).OutputPath
+	android.WriteFileRule(ctx, txt.outputFile, txt.getSanitizerLibs(ctx))
+
+	installPath := android.PathForModuleInstall(ctx, "etc")
+	ctx.InstallFile(installPath, filename, txt.outputFile)
+}
+
+func (txt *sanitizerLibrariesTxtModule) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{{
+		Class:      "ETC",
+		OutputFile: android.OptionalPathForPath(txt.outputFile),
+	}}
+}
+
+// PrebuiltEtcModule interface
+func (txt *sanitizerLibrariesTxtModule) OutputFile() android.OutputPath {
+	return txt.outputFile
+}
+
+// PrebuiltEtcModule interface
+func (txt *sanitizerLibrariesTxtModule) BaseDir() string {
+	return "etc"
+}
+
+// PrebuiltEtcModule interface
+func (txt *sanitizerLibrariesTxtModule) SubDir() string {
+	return ""
+}
+
+func (txt *sanitizerLibrariesTxtModule) OutputFiles(tag string) (android.Paths, error) {
+	return android.Paths{txt.outputFile}, nil
+}
diff --git a/cmd/release_config/build_flag_declarations/main.go b/cmd/release_config/build_flag_declarations/main.go
index 8315f59..7fdd084 100644
--- a/cmd/release_config/build_flag_declarations/main.go
+++ b/cmd/release_config/build_flag_declarations/main.go
@@ -73,7 +73,7 @@
 		(*flagArtifacts)[*fa.FlagDeclaration.Name] = fa
 	}
 
-	message := flagArtifacts.GenerateFlagArtifacts()
+	message := flagArtifacts.GenerateFlagDeclarationArtifacts()
 	err = rc_lib.WriteFormattedMessage(flags.output, flags.format, message)
 	if err != nil {
 		errorExit(err)
diff --git a/cmd/release_config/release_config_lib/flag_artifact.go b/cmd/release_config/release_config_lib/flag_artifact.go
index cdd5af9..6919ff5 100644
--- a/cmd/release_config/release_config_lib/flag_artifact.go
+++ b/cmd/release_config/release_config_lib/flag_artifact.go
@@ -82,24 +82,33 @@
 	return &ret
 }
 
-func (fa *FlagArtifact) GenerateFlagArtifact() *rc_proto.FlagArtifact {
-	ret := &rc_proto.FlagArtifact{FlagDeclaration: fa.FlagDeclaration}
-	if fa.Value != nil {
-		ret.Value = fa.Value
+func (fa *FlagArtifact) GenerateFlagDeclarationArtifact() *rc_proto.FlagDeclarationArtifact {
+	ret := &rc_proto.FlagDeclarationArtifact{
+		Name:            fa.FlagDeclaration.Name,
+		DeclarationPath: fa.Traces[0].Source,
 	}
-	if len(fa.Traces) > 0 {
-		ret.Traces = fa.Traces
+	if namespace := fa.FlagDeclaration.GetNamespace(); namespace != "" {
+		ret.Namespace = proto.String(namespace)
+	}
+	if description := fa.FlagDeclaration.GetDescription(); description != "" {
+		ret.Description = proto.String(description)
+	}
+	if workflow := fa.FlagDeclaration.GetWorkflow(); workflow != rc_proto.Workflow_Workflow_Unspecified {
+		ret.Workflow = &workflow
+	}
+	if containers := fa.FlagDeclaration.GetContainers(); containers != nil {
+		ret.Containers = containers
 	}
 	return ret
 }
 
-func (fas *FlagArtifacts) GenerateFlagArtifacts() *rc_proto.FlagArtifacts {
-	ret := &rc_proto.FlagArtifacts{FlagArtifacts: []*rc_proto.FlagArtifact{}}
+func (fas *FlagArtifacts) GenerateFlagDeclarationArtifacts() *rc_proto.FlagDeclarationArtifacts {
+	ret := &rc_proto.FlagDeclarationArtifacts{FlagDeclarationArtifacts: []*rc_proto.FlagDeclarationArtifact{}}
 	for _, fa := range *fas {
-		ret.FlagArtifacts = append(ret.FlagArtifacts, fa.GenerateFlagArtifact())
+		ret.FlagDeclarationArtifacts = append(ret.FlagDeclarationArtifacts, fa.GenerateFlagDeclarationArtifact())
 	}
-	slices.SortFunc(ret.FlagArtifacts, func(a, b *rc_proto.FlagArtifact) int {
-		return cmp.Compare(*a.FlagDeclaration.Name, *b.FlagDeclaration.Name)
+	slices.SortFunc(ret.FlagDeclarationArtifacts, func(a, b *rc_proto.FlagDeclarationArtifact) int {
+		return cmp.Compare(*a.Name, *b.Name)
 	})
 	return ret
 }
diff --git a/cmd/release_config/release_config_proto/Android.bp b/cmd/release_config/release_config_proto/Android.bp
index 8c47f2a..c34d203 100644
--- a/cmd/release_config/release_config_proto/Android.bp
+++ b/cmd/release_config/release_config_proto/Android.bp
@@ -24,6 +24,8 @@
         "golang-protobuf-runtime-protoimpl",
     ],
     srcs: [
+        "build_flags_common.pb.go",
+        "build_flags_declarations.pb.go",
         "build_flags_src.pb.go",
         "build_flags_out.pb.go",
     ],
diff --git a/cmd/release_config/release_config_proto/build_flags_common.pb.go b/cmd/release_config/release_config_proto/build_flags_common.pb.go
new file mode 100644
index 0000000..1e927db
--- /dev/null
+++ b/cmd/release_config/release_config_proto/build_flags_common.pb.go
@@ -0,0 +1,169 @@
+//
+// Copyright (C) 2024 The Android Open-Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.30.0
+// 	protoc        v3.21.12
+// source: build_flags_common.proto
+
+package release_config_proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type Workflow int32
+
+const (
+	Workflow_Workflow_Unspecified Workflow = 0
+	// Boolean value flags that progress from false to true.
+	Workflow_LAUNCH Workflow = 1
+	// String value flags that get updated with new version strings to control
+	// prebuilt inclusion.
+	Workflow_PREBUILT Workflow = 2
+	// Manually managed outside flags.  These are likely to be found in a
+	// different directory than flags with other workflows.
+	Workflow_MANUAL Workflow = 3
+)
+
+// Enum value maps for Workflow.
+var (
+	Workflow_name = map[int32]string{
+		0: "Workflow_Unspecified",
+		1: "LAUNCH",
+		2: "PREBUILT",
+		3: "MANUAL",
+	}
+	Workflow_value = map[string]int32{
+		"Workflow_Unspecified": 0,
+		"LAUNCH":               1,
+		"PREBUILT":             2,
+		"MANUAL":               3,
+	}
+)
+
+func (x Workflow) Enum() *Workflow {
+	p := new(Workflow)
+	*p = x
+	return p
+}
+
+func (x Workflow) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (Workflow) Descriptor() protoreflect.EnumDescriptor {
+	return file_build_flags_common_proto_enumTypes[0].Descriptor()
+}
+
+func (Workflow) Type() protoreflect.EnumType {
+	return &file_build_flags_common_proto_enumTypes[0]
+}
+
+func (x Workflow) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *Workflow) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = Workflow(num)
+	return nil
+}
+
+// Deprecated: Use Workflow.Descriptor instead.
+func (Workflow) EnumDescriptor() ([]byte, []int) {
+	return file_build_flags_common_proto_rawDescGZIP(), []int{0}
+}
+
+var File_build_flags_common_proto protoreflect.FileDescriptor
+
+var file_build_flags_common_proto_rawDesc = []byte{
+	0x0a, 0x18, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x66, 0x6c, 0x61, 0x67, 0x73, 0x5f, 0x63, 0x6f,
+	0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x1c, 0x61, 0x6e, 0x64, 0x72,
+	0x6f, 0x69, 0x64, 0x2e, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66,
+	0x69, 0x67, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2a, 0x4a, 0x0a, 0x08, 0x77, 0x6f, 0x72, 0x6b,
+	0x66, 0x6c, 0x6f, 0x77, 0x12, 0x18, 0x0a, 0x14, 0x57, 0x6f, 0x72, 0x6b, 0x66, 0x6c, 0x6f, 0x77,
+	0x5f, 0x55, 0x6e, 0x73, 0x70, 0x65, 0x63, 0x69, 0x66, 0x69, 0x65, 0x64, 0x10, 0x00, 0x12, 0x0a,
+	0x0a, 0x06, 0x4c, 0x41, 0x55, 0x4e, 0x43, 0x48, 0x10, 0x01, 0x12, 0x0c, 0x0a, 0x08, 0x50, 0x52,
+	0x45, 0x42, 0x55, 0x49, 0x4c, 0x54, 0x10, 0x02, 0x12, 0x0a, 0x0a, 0x06, 0x4d, 0x41, 0x4e, 0x55,
+	0x41, 0x4c, 0x10, 0x03, 0x42, 0x33, 0x5a, 0x31, 0x61, 0x6e, 0x64, 0x72, 0x6f, 0x69, 0x64, 0x2f,
+	0x73, 0x6f, 0x6f, 0x6e, 0x67, 0x2f, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f,
+	0x6e, 0x66, 0x69, 0x67, 0x2f, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e,
+	0x66, 0x69, 0x67, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+}
+
+var (
+	file_build_flags_common_proto_rawDescOnce sync.Once
+	file_build_flags_common_proto_rawDescData = file_build_flags_common_proto_rawDesc
+)
+
+func file_build_flags_common_proto_rawDescGZIP() []byte {
+	file_build_flags_common_proto_rawDescOnce.Do(func() {
+		file_build_flags_common_proto_rawDescData = protoimpl.X.CompressGZIP(file_build_flags_common_proto_rawDescData)
+	})
+	return file_build_flags_common_proto_rawDescData
+}
+
+var file_build_flags_common_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_build_flags_common_proto_goTypes = []interface{}{
+	(Workflow)(0), // 0: android.release_config_proto.workflow
+}
+var file_build_flags_common_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_build_flags_common_proto_init() }
+func file_build_flags_common_proto_init() {
+	if File_build_flags_common_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_build_flags_common_proto_rawDesc,
+			NumEnums:      1,
+			NumMessages:   0,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_build_flags_common_proto_goTypes,
+		DependencyIndexes: file_build_flags_common_proto_depIdxs,
+		EnumInfos:         file_build_flags_common_proto_enumTypes,
+	}.Build()
+	File_build_flags_common_proto = out.File
+	file_build_flags_common_proto_rawDesc = nil
+	file_build_flags_common_proto_goTypes = nil
+	file_build_flags_common_proto_depIdxs = nil
+}
diff --git a/cmd/release_config/release_config_proto/build_flags_common.proto b/cmd/release_config/release_config_proto/build_flags_common.proto
new file mode 100644
index 0000000..d5d6101
--- /dev/null
+++ b/cmd/release_config/release_config_proto/build_flags_common.proto
@@ -0,0 +1,36 @@
+//
+// Copyright (C) 2024 The Android Open-Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+package android.release_config_proto;
+option go_package = "android/soong/release_config/release_config_proto";
+
+// This protobuf file defines common messages used in the rest of the build flag
+// protos.
+
+enum workflow {
+  Workflow_Unspecified = 0;
+
+  // Boolean value flags that progress from false to true.
+  LAUNCH = 1;
+
+  // String value flags that get updated with new version strings to control
+  // prebuilt inclusion.
+  PREBUILT = 2;
+
+  // Manually managed outside flags.  These are likely to be found in a
+  // different directory than flags with other workflows.
+  MANUAL = 3;
+}
diff --git a/cmd/release_config/release_config_proto/build_flags_declarations.pb.go b/cmd/release_config/release_config_proto/build_flags_declarations.pb.go
new file mode 100644
index 0000000..c0573ed
--- /dev/null
+++ b/cmd/release_config/release_config_proto/build_flags_declarations.pb.go
@@ -0,0 +1,301 @@
+//
+// Copyright (C) 2024 The Android Open-Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.30.0
+// 	protoc        v3.21.12
+// source: build_flags_declarations.proto
+
+package release_config_proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type FlagDeclarationArtifact struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The name of the flag.
+	// See # name for format detail
+	Name *string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	// Namespace the flag belongs to (required)
+	// See # namespace for format detail
+	Namespace *string `protobuf:"bytes,2,opt,name=namespace" json:"namespace,omitempty"`
+	// Text description of the flag's purpose.
+	Description *string `protobuf:"bytes,3,opt,name=description" json:"description,omitempty"`
+	// Where the flag was declared.
+	DeclarationPath *string `protobuf:"bytes,5,opt,name=declaration_path,json=declarationPath" json:"declaration_path,omitempty"`
+	// Workflow for this flag.
+	Workflow *Workflow `protobuf:"varint,205,opt,name=workflow,enum=android.release_config_proto.Workflow" json:"workflow,omitempty"`
+	// The container for this flag.  This overrides any default container given
+	// in the release_config_map message.
+	Containers []string `protobuf:"bytes,206,rep,name=containers" json:"containers,omitempty"`
+}
+
+func (x *FlagDeclarationArtifact) Reset() {
+	*x = FlagDeclarationArtifact{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_build_flags_declarations_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FlagDeclarationArtifact) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FlagDeclarationArtifact) ProtoMessage() {}
+
+func (x *FlagDeclarationArtifact) ProtoReflect() protoreflect.Message {
+	mi := &file_build_flags_declarations_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FlagDeclarationArtifact.ProtoReflect.Descriptor instead.
+func (*FlagDeclarationArtifact) Descriptor() ([]byte, []int) {
+	return file_build_flags_declarations_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *FlagDeclarationArtifact) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *FlagDeclarationArtifact) GetNamespace() string {
+	if x != nil && x.Namespace != nil {
+		return *x.Namespace
+	}
+	return ""
+}
+
+func (x *FlagDeclarationArtifact) GetDescription() string {
+	if x != nil && x.Description != nil {
+		return *x.Description
+	}
+	return ""
+}
+
+func (x *FlagDeclarationArtifact) GetDeclarationPath() string {
+	if x != nil && x.DeclarationPath != nil {
+		return *x.DeclarationPath
+	}
+	return ""
+}
+
+func (x *FlagDeclarationArtifact) GetWorkflow() Workflow {
+	if x != nil && x.Workflow != nil {
+		return *x.Workflow
+	}
+	return Workflow_Workflow_Unspecified
+}
+
+func (x *FlagDeclarationArtifact) GetContainers() []string {
+	if x != nil {
+		return x.Containers
+	}
+	return nil
+}
+
+type FlagDeclarationArtifacts struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The artifacts
+	FlagDeclarationArtifacts []*FlagDeclarationArtifact `protobuf:"bytes,1,rep,name=flag_declaration_artifacts,json=flagDeclarationArtifacts" json:"flag_declaration_artifacts,omitempty"`
+}
+
+func (x *FlagDeclarationArtifacts) Reset() {
+	*x = FlagDeclarationArtifacts{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_build_flags_declarations_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FlagDeclarationArtifacts) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FlagDeclarationArtifacts) ProtoMessage() {}
+
+func (x *FlagDeclarationArtifacts) ProtoReflect() protoreflect.Message {
+	mi := &file_build_flags_declarations_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FlagDeclarationArtifacts.ProtoReflect.Descriptor instead.
+func (*FlagDeclarationArtifacts) Descriptor() ([]byte, []int) {
+	return file_build_flags_declarations_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *FlagDeclarationArtifacts) GetFlagDeclarationArtifacts() []*FlagDeclarationArtifact {
+	if x != nil {
+		return x.FlagDeclarationArtifacts
+	}
+	return nil
+}
+
+var File_build_flags_declarations_proto protoreflect.FileDescriptor
+
+var file_build_flags_declarations_proto_rawDesc = []byte{
+	0x0a, 0x1e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x66, 0x6c, 0x61, 0x67, 0x73, 0x5f, 0x64, 0x65,
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+	0x5f, 0x64, 0x65, 0x63, 0x6c, 0x61, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x61, 0x72, 0x74,
+	0x69, 0x66, 0x61, 0x63, 0x74, 0x52, 0x18, 0x66, 0x6c, 0x61, 0x67, 0x44, 0x65, 0x63, 0x6c, 0x61,
+	0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x41, 0x72, 0x74, 0x69, 0x66, 0x61, 0x63, 0x74, 0x73, 0x42,
+	0x33, 0x5a, 0x31, 0x61, 0x6e, 0x64, 0x72, 0x6f, 0x69, 0x64, 0x2f, 0x73, 0x6f, 0x6f, 0x6e, 0x67,
+	0x2f, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2f,
+	0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x70,
+	0x72, 0x6f, 0x74, 0x6f,
+}
+
+var (
+	file_build_flags_declarations_proto_rawDescOnce sync.Once
+	file_build_flags_declarations_proto_rawDescData = file_build_flags_declarations_proto_rawDesc
+)
+
+func file_build_flags_declarations_proto_rawDescGZIP() []byte {
+	file_build_flags_declarations_proto_rawDescOnce.Do(func() {
+		file_build_flags_declarations_proto_rawDescData = protoimpl.X.CompressGZIP(file_build_flags_declarations_proto_rawDescData)
+	})
+	return file_build_flags_declarations_proto_rawDescData
+}
+
+var file_build_flags_declarations_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_build_flags_declarations_proto_goTypes = []interface{}{
+	(*FlagDeclarationArtifact)(nil),  // 0: android.release_config_proto.flag_declaration_artifact
+	(*FlagDeclarationArtifacts)(nil), // 1: android.release_config_proto.flag_declaration_artifacts
+	(Workflow)(0),                    // 2: android.release_config_proto.workflow
+}
+var file_build_flags_declarations_proto_depIdxs = []int32{
+	2, // 0: android.release_config_proto.flag_declaration_artifact.workflow:type_name -> android.release_config_proto.workflow
+	0, // 1: android.release_config_proto.flag_declaration_artifacts.flag_declaration_artifacts:type_name -> android.release_config_proto.flag_declaration_artifact
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
+}
+
+func init() { file_build_flags_declarations_proto_init() }
+func file_build_flags_declarations_proto_init() {
+	if File_build_flags_declarations_proto != nil {
+		return
+	}
+	file_build_flags_common_proto_init()
+	if !protoimpl.UnsafeEnabled {
+		file_build_flags_declarations_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FlagDeclarationArtifact); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_build_flags_declarations_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FlagDeclarationArtifacts); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_build_flags_declarations_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_build_flags_declarations_proto_goTypes,
+		DependencyIndexes: file_build_flags_declarations_proto_depIdxs,
+		MessageInfos:      file_build_flags_declarations_proto_msgTypes,
+	}.Build()
+	File_build_flags_declarations_proto = out.File
+	file_build_flags_declarations_proto_rawDesc = nil
+	file_build_flags_declarations_proto_goTypes = nil
+	file_build_flags_declarations_proto_depIdxs = nil
+}
diff --git a/cmd/release_config/release_config_proto/build_flags_declarations.proto b/cmd/release_config/release_config_proto/build_flags_declarations.proto
new file mode 100644
index 0000000..e0cf099
--- /dev/null
+++ b/cmd/release_config/release_config_proto/build_flags_declarations.proto
@@ -0,0 +1,75 @@
+//
+// Copyright (C) 2024 The Android Open-Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+package android.release_config_proto;
+option go_package = "android/soong/release_config/release_config_proto";
+
+import "build_flags_common.proto";
+
+// This protobuf file defines messages used to represent the
+// all_build_flag_declarations artifact for use in automated systems, such as
+// Gantry.
+//
+// The following format requirements apply across various message fields:
+//
+// # name: name of the flag
+//
+//    format: an uppercase string in SNAKE_CASE format starting with RELEASE_,
+//      no consecutive underscores, and no leading digit. For example
+//      RELEASE_MY_PACKAGE_FLAG is a valid name, while MY_PACKAGE_FLAG, and
+//      RELEASE_MY_PACKAGE__FLAG are invalid.
+//
+// # package: package to which the flag belongs
+//
+//    format: lowercase strings in snake_case format, delimited by dots, no
+//      consecutive underscores and no leading digit in each string. For example
+//      com.android.mypackage is a valid name while com.android.myPackage,
+//      com.android.1mypackage are invalid
+
+message flag_declaration_artifact {
+  // The name of the flag.
+  // See # name for format detail
+  optional string name = 1;
+
+  // Namespace the flag belongs to (required)
+  // See # namespace for format detail
+  optional string namespace = 2;
+
+  // Text description of the flag's purpose.
+  optional string description = 3;
+
+  // reserve this for bug, if needed.
+  reserved 4;
+
+  // Where the flag was declared.
+  optional string declaration_path = 5;
+
+  // Workflow for this flag.
+  optional workflow workflow = 205;
+
+  // The container for this flag.  This overrides any default container given
+  // in the release_config_map message.
+  repeated string containers = 206;
+
+  // The package associated with this flag.
+  // (when Gantry is ready for it) optional string package = 207;
+  reserved 207;
+}
+
+message flag_declaration_artifacts {
+  // The artifacts
+  repeated flag_declaration_artifact flag_declaration_artifacts = 1;
+}
diff --git a/cmd/release_config/release_config_proto/build_flags_out.pb.go b/cmd/release_config/release_config_proto/build_flags_out.pb.go
index 73cc1dc..42ae6f9 100644
--- a/cmd/release_config/release_config_proto/build_flags_out.pb.go
+++ b/cmd/release_config/release_config_proto/build_flags_out.pb.go
@@ -15,7 +15,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.33.0
+// 	protoc-gen-go v1.30.0
 // 	protoc        v3.21.12
 // source: build_flags_out.proto
 
diff --git a/cmd/release_config/release_config_proto/build_flags_src.pb.go b/cmd/release_config/release_config_proto/build_flags_src.pb.go
index a538236..1b63961 100644
--- a/cmd/release_config/release_config_proto/build_flags_src.pb.go
+++ b/cmd/release_config/release_config_proto/build_flags_src.pb.go
@@ -15,7 +15,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.33.0
+// 	protoc-gen-go v1.30.0
 // 	protoc        v3.21.12
 // source: build_flags_src.proto
 
@@ -35,73 +35,6 @@
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-type Workflow int32
-
-const (
-	Workflow_Workflow_Unspecified Workflow = 0
-	// Boolean value flags that progress from false to true.
-	Workflow_LAUNCH Workflow = 1
-	// String value flags that get updated with new version strings to control
-	// prebuilt inclusion.
-	Workflow_PREBUILT Workflow = 2
-	// Manually managed outside flags.  These are likely to be found in a
-	// different directory than flags with other workflows.
-	Workflow_MANUAL Workflow = 3
-)
-
-// Enum value maps for Workflow.
-var (
-	Workflow_name = map[int32]string{
-		0: "Workflow_Unspecified",
-		1: "LAUNCH",
-		2: "PREBUILT",
-		3: "MANUAL",
-	}
-	Workflow_value = map[string]int32{
-		"Workflow_Unspecified": 0,
-		"LAUNCH":               1,
-		"PREBUILT":             2,
-		"MANUAL":               3,
-	}
-)
-
-func (x Workflow) Enum() *Workflow {
-	p := new(Workflow)
-	*p = x
-	return p
-}
-
-func (x Workflow) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (Workflow) Descriptor() protoreflect.EnumDescriptor {
-	return file_build_flags_src_proto_enumTypes[0].Descriptor()
-}
-
-func (Workflow) Type() protoreflect.EnumType {
-	return &file_build_flags_src_proto_enumTypes[0]
-}
-
-func (x Workflow) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Do not use.
-func (x *Workflow) UnmarshalJSON(b []byte) error {
-	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
-	if err != nil {
-		return err
-	}
-	*x = Workflow(num)
-	return nil
-}
-
-// Deprecated: Use Workflow.Descriptor instead.
-func (Workflow) EnumDescriptor() ([]byte, []int) {
-	return file_build_flags_src_proto_rawDescGZIP(), []int{0}
-}
-
 type Value struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -586,75 +519,72 @@
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 	0x2e, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xa5, 0x01, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x12,
-	0x2e, 0x0a, 0x11, 0x75, 0x6e, 0x73, 0x70, 0x65, 0x63, 0x69, 0x66, 0x69, 0x65, 0x64, 0x5f, 0x76,
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+	0x6c, 0x79, 0x18, 0x04, 0x20, 0x01, 0x28, 0x08, 0x52, 0x10, 0x61, 0x63, 0x6f, 0x6e, 0x66, 0x69,
+	0x67, 0x46, 0x6c, 0x61, 0x67, 0x73, 0x4f, 0x6e, 0x6c, 0x79, 0x22, 0x3b, 0x0a, 0x0d, 0x72, 0x65,
+	0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x61, 0x6c, 0x69, 0x61, 0x73, 0x12, 0x12, 0x0a, 0x04, 0x6e,
+	0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12,
+	0x16, 0x0a, 0x06, 0x74, 0x61, 0x72, 0x67, 0x65, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x06, 0x74, 0x61, 0x72, 0x67, 0x65, 0x74, 0x22, 0xac, 0x01, 0x0a, 0x12, 0x72, 0x65, 0x6c, 0x65,
+	0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x6d, 0x61, 0x70, 0x12, 0x45,
+	0x0a, 0x07, 0x61, 0x6c, 0x69, 0x61, 0x73, 0x65, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32,
+	0x2b, 0x2e, 0x61, 0x6e, 0x64, 0x72, 0x6f, 0x69, 0x64, 0x2e, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73,
+	0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x72,
+	0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x61, 0x6c, 0x69, 0x61, 0x73, 0x52, 0x07, 0x61, 0x6c,
+	0x69, 0x61, 0x73, 0x65, 0x73, 0x12, 0x20, 0x0a, 0x0b, 0x64, 0x65, 0x73, 0x63, 0x72, 0x69, 0x70,
+	0x74, 0x69, 0x6f, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x64, 0x65, 0x73, 0x63,
+	0x72, 0x69, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x2d, 0x0a, 0x12, 0x64, 0x65, 0x66, 0x61, 0x75,
+	0x6c, 0x74, 0x5f, 0x63, 0x6f, 0x6e, 0x74, 0x61, 0x69, 0x6e, 0x65, 0x72, 0x73, 0x18, 0x03, 0x20,
+	0x03, 0x28, 0x09, 0x52, 0x11, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74, 0x43, 0x6f, 0x6e, 0x74,
+	0x61, 0x69, 0x6e, 0x65, 0x72, 0x73, 0x42, 0x33, 0x5a, 0x31, 0x61, 0x6e, 0x64, 0x72, 0x6f, 0x69,
+	0x64, 0x2f, 0x73, 0x6f, 0x6f, 0x6e, 0x67, 0x2f, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f,
+	0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2f, 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x5f, 0x63,
+	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f,
 }
 
 var (
@@ -669,22 +599,21 @@
 	return file_build_flags_src_proto_rawDescData
 }
 
-var file_build_flags_src_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
 var file_build_flags_src_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
 var file_build_flags_src_proto_goTypes = []interface{}{
-	(Workflow)(0),            // 0: android.release_config_proto.workflow
-	(*Value)(nil),            // 1: android.release_config_proto.value
-	(*FlagDeclaration)(nil),  // 2: android.release_config_proto.flag_declaration
-	(*FlagValue)(nil),        // 3: android.release_config_proto.flag_value
-	(*ReleaseConfig)(nil),    // 4: android.release_config_proto.release_config
-	(*ReleaseAlias)(nil),     // 5: android.release_config_proto.release_alias
-	(*ReleaseConfigMap)(nil), // 6: android.release_config_proto.release_config_map
+	(*Value)(nil),            // 0: android.release_config_proto.value
+	(*FlagDeclaration)(nil),  // 1: android.release_config_proto.flag_declaration
+	(*FlagValue)(nil),        // 2: android.release_config_proto.flag_value
+	(*ReleaseConfig)(nil),    // 3: android.release_config_proto.release_config
+	(*ReleaseAlias)(nil),     // 4: android.release_config_proto.release_alias
+	(*ReleaseConfigMap)(nil), // 5: android.release_config_proto.release_config_map
+	(Workflow)(0),            // 6: android.release_config_proto.workflow
 }
 var file_build_flags_src_proto_depIdxs = []int32{
-	1, // 0: android.release_config_proto.flag_declaration.value:type_name -> android.release_config_proto.value
-	0, // 1: android.release_config_proto.flag_declaration.workflow:type_name -> android.release_config_proto.workflow
-	1, // 2: android.release_config_proto.flag_value.value:type_name -> android.release_config_proto.value
-	5, // 3: android.release_config_proto.release_config_map.aliases:type_name -> android.release_config_proto.release_alias
+	0, // 0: android.release_config_proto.flag_declaration.value:type_name -> android.release_config_proto.value
+	6, // 1: android.release_config_proto.flag_declaration.workflow:type_name -> android.release_config_proto.workflow
+	0, // 2: android.release_config_proto.flag_value.value:type_name -> android.release_config_proto.value
+	4, // 3: android.release_config_proto.release_config_map.aliases:type_name -> android.release_config_proto.release_alias
 	4, // [4:4] is the sub-list for method output_type
 	4, // [4:4] is the sub-list for method input_type
 	4, // [4:4] is the sub-list for extension type_name
@@ -697,6 +626,7 @@
 	if File_build_flags_src_proto != nil {
 		return
 	}
+	file_build_flags_common_proto_init()
 	if !protoimpl.UnsafeEnabled {
 		file_build_flags_src_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Value); i {
@@ -782,14 +712,13 @@
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_build_flags_src_proto_rawDesc,
-			NumEnums:      1,
+			NumEnums:      0,
 			NumMessages:   6,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_build_flags_src_proto_goTypes,
 		DependencyIndexes: file_build_flags_src_proto_depIdxs,
-		EnumInfos:         file_build_flags_src_proto_enumTypes,
 		MessageInfos:      file_build_flags_src_proto_msgTypes,
 	}.Build()
 	File_build_flags_src_proto = out.File
diff --git a/cmd/release_config/release_config_proto/build_flags_src.proto b/cmd/release_config/release_config_proto/build_flags_src.proto
index cb0d9d9..6623294 100644
--- a/cmd/release_config/release_config_proto/build_flags_src.proto
+++ b/cmd/release_config/release_config_proto/build_flags_src.proto
@@ -17,6 +17,8 @@
 package android.release_config_proto;
 option go_package = "android/soong/release_config/release_config_proto";
 
+import "build_flags_common.proto";
+
 // This protobuf file defines messages used to represent the build flags used by
 // a release in a more human-editable form.  It is used for on-disk files in the
 // source tree.
@@ -42,21 +44,6 @@
 //      com.android.mypackage is a valid name while com.android.myPackage,
 //      com.android.1mypackage are invalid
 
-enum workflow {
-  Workflow_Unspecified = 0;
-
-  // Boolean value flags that progress from false to true.
-  LAUNCH = 1;
-
-  // String value flags that get updated with new version strings to control
-  // prebuilt inclusion.
-  PREBUILT = 2;
-
-  // Manually managed outside flags.  These are likely to be found in a
-  // different directory than flags with other workflows.
-  MANUAL = 3;
-}
-
 message value {
   oneof val {
     bool unspecified_value = 200;
diff --git a/cmd/release_config/release_config_proto/regen.sh b/cmd/release_config/release_config_proto/regen.sh
index 1846c4d..23e3115 100644
--- a/cmd/release_config/release_config_proto/regen.sh
+++ b/cmd/release_config/release_config_proto/regen.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 
-aprotoc --go_out=paths=source_relative:. build_flags_src.proto build_flags_out.proto
+aprotoc --go_out=paths=source_relative:. build_flags_src.proto build_flags_out.proto build_flags_common.proto build_flags_declarations.proto
diff --git a/go.mod b/go.mod
index 1174958..13834fc 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module android/soong
 
-go 1.21
+go 1.22
 
 require (
 	github.com/google/blueprint v0.0.0
diff --git a/go.work b/go.work
index 7c6022b..9a7e6db 100644
--- a/go.work
+++ b/go.work
@@ -1,4 +1,4 @@
-go 1.21
+go 1.22
 
 use (
 	.
diff --git a/java/base.go b/java/base.go
index e97d28d..b9e236c 100644
--- a/java/base.go
+++ b/java/base.go
@@ -715,6 +715,7 @@
 	// doesn't make sense) or framework libraries (e.g. libraries found in the InstrumentFrameworkModules list) unless EMMA_INSTRUMENT_FRAMEWORK is true.
 	apexInfo, _ := android.ModuleProvider(ctx, android.ApexInfoProvider)
 	isJacocoAgent := ctx.ModuleName() == "jacocoagent"
+
 	if j.DirectlyInAnyApex() && !isJacocoAgent && !apexInfo.IsForPlatform() {
 		if !inList(ctx.ModuleName(), config.InstrumentFrameworkModules) {
 			return true
diff --git a/java/java.go b/java/java.go
index e3f4824..9fe7a2f 100644
--- a/java/java.go
+++ b/java/java.go
@@ -567,6 +567,12 @@
 		return normalizeJavaVersion(ctx, javaVersion)
 	} else if ctx.Device() {
 		return defaultJavaLanguageVersion(ctx, sdkContext.SdkVersion(ctx))
+	} else if ctx.Config().TargetsJava21() {
+		// Temporary experimental flag to be able to try and build with
+		// java version 21 options.  The flag, if used, just sets Java
+		// 21 as the default version, leaving any components that
+		// target an older version intact.
+		return JAVA_VERSION_21
 	} else {
 		return JAVA_VERSION_17
 	}
diff --git a/java/sdk.go b/java/sdk.go
index d972c19..4ef4ee2 100644
--- a/java/sdk.go
+++ b/java/sdk.go
@@ -65,6 +65,12 @@
 		return JAVA_VERSION_9
 	} else if sdk.FinalOrFutureInt() <= 33 {
 		return JAVA_VERSION_11
+	} else if ctx.Config().TargetsJava21() {
+		// Temporary experimental flag to be able to try and build with
+		// java version 21 options.  The flag, if used, just sets Java
+		// 21 as the default version, leaving any components that
+		// target an older version intact.
+		return JAVA_VERSION_21
 	} else {
 		return JAVA_VERSION_17
 	}
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 8c91288..72eb6e3 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -1506,6 +1506,12 @@
 
 var _ android.InstallNeededDependencyTag = sdkLibraryComponentTag{}
 
+// To satisfy the CopyDirectlyInAnyApexTag interface. Implementation library of the sdk library
+// in an apex is considered to be directly in the apex, as if it was listed in java_libs.
+func (t sdkLibraryComponentTag) CopyDirectlyInAnyApex() {}
+
+var _ android.CopyDirectlyInAnyApexTag = implLibraryTag
+
 func (t sdkLibraryComponentTag) InstallDepNeeded() bool {
 	return t.name == "xml-permissions-file" || t.name == "impl-library"
 }