diff --git a/android/module.go b/android/module.go
index 6a2cc89..11f63bd 100644
--- a/android/module.go
+++ b/android/module.go
@@ -2866,18 +2866,31 @@
 	return strings.IndexByte(module, '/') == -1
 }
 
+// sourceOrOutputDependencyTag is the dependency tag added automatically by pathDepsMutator for any
+// module reference in a property annotated with `android:"path"` or passed to ExtractSourceDeps
+// or ExtractSourcesDeps.
+//
+// If uniquely identifies the dependency that was added as it contains both the module name used to
+// add the dependency as well as the tag. That makes it very simple to find the matching dependency
+// in GetModuleFromPathDep as all it needs to do is find the dependency whose tag matches the tag
+// used to add it. It does not need to check that the module name as returned by one of
+// Module.Name(), BaseModuleContext.OtherModuleName() or ModuleBase.BaseModuleName() matches the
+// name supplied in the tag. That means it does not need to handle differences in module names
+// caused by prebuilt_ prefix, or fully qualified module names.
 type sourceOrOutputDependencyTag struct {
 	blueprint.BaseDependencyTag
+
+	// The name of the module.
+	moduleName string
+
+	// The tag that will be passed to the module's OutputFileProducer.OutputFiles(tag) method.
 	tag string
 }
 
-func sourceOrOutputDepTag(tag string) blueprint.DependencyTag {
-	return sourceOrOutputDependencyTag{tag: tag}
+func sourceOrOutputDepTag(moduleName, tag string) blueprint.DependencyTag {
+	return sourceOrOutputDependencyTag{moduleName: moduleName, tag: tag}
 }
 
-// Deprecated, use IsSourceDepTagWithOutputTag(tag, "") instead.
-var SourceDepTag = sourceOrOutputDepTag("")
-
 // IsSourceDepTag returns true if the supplied blueprint.DependencyTag is one that was used to add
 // dependencies by either ExtractSourceDeps, ExtractSourcesDeps or automatically for properties
 // tagged with `android:"path"`.
@@ -2908,7 +2921,7 @@
 				ctx.ModuleErrorf("found source dependency duplicate: %q!", s)
 			} else {
 				set[s] = true
-				ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
+				ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(m, t), m)
 			}
 		}
 	}
@@ -2921,7 +2934,7 @@
 func ExtractSourceDeps(ctx BottomUpMutatorContext, s *string) {
 	if s != nil {
 		if m, t := SrcIsModuleWithTag(*s); m != "" {
-			ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
+			ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(m, t), m)
 		}
 	}
 }
diff --git a/android/path_properties.go b/android/path_properties.go
index 4446773..3976880 100644
--- a/android/path_properties.go
+++ b/android/path_properties.go
@@ -51,7 +51,7 @@
 	// Add dependencies to anything that is a module reference.
 	for _, s := range pathProperties {
 		if m, t := SrcIsModuleWithTag(s); m != "" {
-			ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
+			ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(m, t), m)
 		}
 	}
 }
diff --git a/android/paths.go b/android/paths.go
index 99d5ba7..bec8a51 100644
--- a/android/paths.go
+++ b/android/paths.go
@@ -88,7 +88,8 @@
 // the Path methods that rely on module dependencies having been resolved.
 type ModuleWithDepsPathContext interface {
 	EarlyModulePathContext
-	GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module
+	VisitDirectDepsBlueprint(visit func(blueprint.Module))
+	OtherModuleDependencyTag(m blueprint.Module) blueprint.DependencyTag
 }
 
 // ModuleMissingDepsPathContext is a subset of *ModuleContext methods required by
@@ -484,10 +485,27 @@
 //
 // If tag is "" then the returned module will be the dependency that was added for ":moduleName".
 // Otherwise, it is the dependency that was added for ":moduleName{tag}".
-//
-// TODO(b/193228441) Make this handle fully qualified names, e.g. //namespace:moduleName.
 func GetModuleFromPathDep(ctx ModuleWithDepsPathContext, moduleName, tag string) blueprint.Module {
-	return ctx.GetDirectDepWithTag(moduleName, sourceOrOutputDepTag(tag))
+	var found blueprint.Module
+	// The sourceOrOutputDepTag uniquely identifies the module dependency as it contains both the
+	// module name and the tag. Dependencies added automatically for properties tagged with
+	// `android:"path"` are deduped so are guaranteed to be unique. It is possible for duplicate
+	// dependencies to be added manually using ExtractSourcesDeps or ExtractSourceDeps but even then
+	// it will always be the case that the dependencies will be identical, i.e. the same tag and same
+	// moduleName referring to the same dependency module.
+	//
+	// It does not matter whether the moduleName is a fully qualified name or if the module
+	// dependency is a prebuilt module. All that matters is the same information is supplied to
+	// create the tag here as was supplied to create the tag when the dependency was added so that
+	// this finds the matching dependency module.
+	expectedTag := sourceOrOutputDepTag(moduleName, tag)
+	ctx.VisitDirectDepsBlueprint(func(module blueprint.Module) {
+		depTag := ctx.OtherModuleDependencyTag(module)
+		if depTag == expectedTag {
+			found = module
+		}
+	})
+	return found
 }
 
 // PathsAndMissingDepsForModuleSrcExcludes returns a Paths{} containing the resolved references in
diff --git a/android/paths_test.go b/android/paths_test.go
index 7675905..f4e4ce1 100644
--- a/android/paths_test.go
+++ b/android/paths_test.go
@@ -1390,7 +1390,6 @@
 			}),
 		},
 		{
-			// TODO(b/193228441): Fix broken test.
 			name: "output file provider, fully qualified name",
 			bp: `
 			test {
@@ -1398,6 +1397,10 @@
 				src: "//other:b",
 				srcs: ["//other:c"],
 			}`,
+			src:  "out/soong/.intermediates/other/b/gen/b",
+			rel:  "gen/b",
+			srcs: []string{"out/soong/.intermediates/other/c/gen/c"},
+			rels: []string{"gen/c"},
 			preparer: FixtureAddTextFile("other/Android.bp", `
 				soong_namespace {}
 
@@ -1411,10 +1414,6 @@
 					outs: ["gen/c"],
 				}
 			`),
-			errorHandler: FixtureExpectsAllErrorsToMatchAPattern([]string{
-				`"foo": missing dependencies: //other:b, is the property annotated with android:"path"`,
-				`"foo": missing dependency on "//other:c", is the property annotated with android:"path"`,
-			}),
 		},
 	}
 
diff --git a/android/soong_config_modules_test.go b/android/soong_config_modules_test.go
index 8f252d9..b2f8eaa 100644
--- a/android/soong_config_modules_test.go
+++ b/android/soong_config_modules_test.go
@@ -313,6 +313,51 @@
 	})
 }
 
+func TestNonExistentPropertyInSoongConfigModule(t *testing.T) {
+	bp := `
+		soong_config_module_type {
+			name: "acme_test",
+			module_type: "test",
+			config_namespace: "acme",
+			bool_variables: ["feature1"],
+			properties: ["made_up_property"],
+		}
+
+		acme_test {
+			name: "foo",
+			cflags: ["-DGENERIC"],
+			soong_config_variables: {
+				feature1: {
+					made_up_property: true,
+				},
+			},
+		}
+    `
+
+	fixtureForVendorVars := func(vars map[string]map[string]string) FixturePreparer {
+		return FixtureModifyProductVariables(func(variables FixtureProductVariables) {
+			variables.VendorVars = vars
+		})
+	}
+
+	GroupFixturePreparers(
+		fixtureForVendorVars(map[string]map[string]string{"acme": {"feature1": "1"}}),
+		PrepareForTestWithDefaults,
+		FixtureRegisterWithContext(func(ctx RegistrationContext) {
+			ctx.RegisterModuleType("soong_config_module_type_import", soongConfigModuleTypeImportFactory)
+			ctx.RegisterModuleType("soong_config_module_type", soongConfigModuleTypeFactory)
+			ctx.RegisterModuleType("soong_config_string_variable", soongConfigStringVariableDummyFactory)
+			ctx.RegisterModuleType("soong_config_bool_variable", soongConfigBoolVariableDummyFactory)
+			ctx.RegisterModuleType("test_defaults", soongConfigTestDefaultsModuleFactory)
+			ctx.RegisterModuleType("test", soongConfigTestModuleFactory)
+		}),
+		FixtureWithRootAndroidBp(bp),
+	).ExtendWithErrorHandler(FixtureExpectsAllErrorsToMatchAPattern([]string{
+		// TODO(b/171232169): improve the error message for non-existent properties
+		`unrecognized property "soong_config_variables`,
+	})).RunTest(t)
+}
+
 func testConfigWithVendorVars(buildDir, bp string, fs map[string][]byte, vendorVars map[string]map[string]string) Config {
 	config := TestConfig(buildDir, nil, bp, fs)
 
diff --git a/apex/platform_bootclasspath_test.go b/apex/platform_bootclasspath_test.go
index 279cf54..7209c02 100644
--- a/apex/platform_bootclasspath_test.go
+++ b/apex/platform_bootclasspath_test.go
@@ -398,6 +398,7 @@
 			name: "foo",
 			prefer: false,
 			shared_library: false,
+			permitted_packages: ["foo"],
 			public: {
 				jars: ["sdk_library/public/foo-stubs.jar"],
 				stub_srcs: ["sdk_library/public/foo_stub_sources"],
diff --git a/cc/builder.go b/cc/builder.go
index bde8c96..b0842ec 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -500,10 +500,10 @@
 		sAbiDumpFiles = make(android.Paths, 0, len(srcFiles))
 	}
 
-	cflags += " ${config.NoOverrideClangGlobalCflags}"
-	toolingCflags += " ${config.NoOverrideClangGlobalCflags}"
-	cppflags += " ${config.NoOverrideClangGlobalCflags}"
-	toolingCppflags += " ${config.NoOverrideClangGlobalCflags}"
+	cflags += " ${config.NoOverrideGlobalCflags}"
+	toolingCflags += " ${config.NoOverrideGlobalCflags}"
+	cppflags += " ${config.NoOverrideGlobalCflags}"
+	toolingCppflags += " ${config.NoOverrideGlobalCflags}"
 
 	for i, srcFile := range srcFiles {
 		objFile := android.ObjPathWithExt(ctx, subdir, srcFile, "o")
diff --git a/cc/cc_test.go b/cc/cc_test.go
index 0a74e58..0a3acb9 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -4038,14 +4038,14 @@
 	}
 
 	want := []string{
-		"${config.ArmClangThumbCflags}",
-		"${config.ArmClangCflags}",
-		"${config.CommonClangGlobalCflags}",
-		"${config.DeviceClangGlobalCflags}",
-		"${config.ClangExternalCflags}",
-		"${config.ArmToolchainClangCflags}",
-		"${config.ArmClangArmv7ANeonCflags}",
-		"${config.ArmClangGenericCflags}",
+		"${config.ArmThumbCflags}",
+		"${config.ArmCflags}",
+		"${config.CommonGlobalCflags}",
+		"${config.DeviceGlobalCflags}",
+		"${config.ExternalCflags}",
+		"${config.ArmToolchainCflags}",
+		"${config.ArmArmv7ANeonCflags}",
+		"${config.ArmGenericCflags}",
 		"android_arm_export_include_dirs",
 		"lib32_export_include_dirs",
 		"arm_export_include_dirs",
@@ -4076,7 +4076,7 @@
 		"defaults/cc/common/ndk_libandroid_support",
 		"out/soong/ndk/sysroot/usr/include",
 		"out/soong/ndk/sysroot/usr/include/arm-linux-androideabi",
-		"${config.NoOverrideClangGlobalCflags}",
+		"${config.NoOverrideGlobalCflags}",
 	}
 
 	android.AssertArrayString(t, "includes", want, includes)
diff --git a/cc/compiler.go b/cc/compiler.go
index 69ead30..b01ba43 100644
--- a/cc/compiler.go
+++ b/cc/compiler.go
@@ -392,7 +392,7 @@
 	if flags.RequiredInstructionSet != "" {
 		instructionSet = flags.RequiredInstructionSet
 	}
-	instructionSetFlags, err := tc.ClangInstructionSetFlags(instructionSet)
+	instructionSetFlags, err := tc.InstructionSetFlags(instructionSet)
 	if err != nil {
 		ctx.ModuleErrorf("%s", err)
 	}
@@ -437,15 +437,15 @@
 	flags.Global.ConlyFlags = append([]string{"${config.CommonGlobalConlyflags}"}, flags.Global.ConlyFlags...)
 	flags.Global.CppFlags = append([]string{fmt.Sprintf("${config.%sGlobalCppflags}", hod)}, flags.Global.CppFlags...)
 
-	flags.Global.AsFlags = append(flags.Global.AsFlags, tc.ClangAsflags())
-	flags.Global.CppFlags = append([]string{"${config.CommonClangGlobalCppflags}"}, flags.Global.CppFlags...)
+	flags.Global.AsFlags = append(flags.Global.AsFlags, tc.Asflags())
+	flags.Global.CppFlags = append([]string{"${config.CommonGlobalCppflags}"}, flags.Global.CppFlags...)
 	flags.Global.CommonFlags = append(flags.Global.CommonFlags,
-		tc.ClangCflags(),
-		"${config.CommonClangGlobalCflags}",
-		fmt.Sprintf("${config.%sClangGlobalCflags}", hod))
+		tc.Cflags(),
+		"${config.CommonGlobalCflags}",
+		fmt.Sprintf("${config.%sGlobalCflags}", hod))
 
 	if isThirdParty(modulePath) {
-		flags.Global.CommonFlags = append(flags.Global.CommonFlags, "${config.ClangExternalCflags}")
+		flags.Global.CommonFlags = append(flags.Global.CommonFlags, "${config.ExternalCflags}")
 	}
 
 	if tc.Bionic() {
@@ -458,11 +458,11 @@
 
 	flags.Global.AsFlags = append(flags.Global.AsFlags, "-D__ASSEMBLY__")
 
-	flags.Global.CppFlags = append(flags.Global.CppFlags, tc.ClangCppflags())
+	flags.Global.CppFlags = append(flags.Global.CppFlags, tc.Cppflags())
 
 	flags.Global.YasmFlags = append(flags.Global.YasmFlags, tc.YasmFlags())
 
-	flags.Global.CommonFlags = append(flags.Global.CommonFlags, tc.ToolchainClangCflags())
+	flags.Global.CommonFlags = append(flags.Global.CommonFlags, tc.ToolchainCflags())
 
 	cStd := config.CStdVersion
 	if String(compiler.Properties.C_std) == "experimental" {
diff --git a/cc/config/arm64_device.go b/cc/config/arm64_device.go
index af6361b..812a245 100644
--- a/cc/config/arm64_device.go
+++ b/cc/config/arm64_device.go
@@ -48,12 +48,12 @@
 		"-Wl,-z,separate-code",
 	}
 
-	arm64Lldflags = append(ClangFilterUnknownLldflags(arm64Ldflags),
+	arm64Lldflags = append(arm64Ldflags,
 		"-Wl,-z,max-page-size=4096")
 
 	arm64Cppflags = []string{}
 
-	arm64ClangCpuVariantCflags = map[string][]string{
+	arm64CpuVariantCflags = map[string][]string{
 		"cortex-a53": []string{
 			"-mcpu=cortex-a53",
 		},
@@ -99,52 +99,50 @@
 	pctx.StaticVariable("Arm64Ldflags", strings.Join(arm64Ldflags, " "))
 	pctx.StaticVariable("Arm64Lldflags", strings.Join(arm64Lldflags, " "))
 
-	pctx.StaticVariable("Arm64ClangCflags", strings.Join(ClangFilterUnknownCflags(arm64Cflags), " "))
-	pctx.StaticVariable("Arm64ClangLdflags", strings.Join(ClangFilterUnknownCflags(arm64Ldflags), " "))
-	pctx.StaticVariable("Arm64ClangLldflags", strings.Join(ClangFilterUnknownCflags(arm64Lldflags), " "))
-	pctx.StaticVariable("Arm64ClangCppflags", strings.Join(ClangFilterUnknownCflags(arm64Cppflags), " "))
+	pctx.StaticVariable("Arm64Cflags", strings.Join(arm64Cflags, " "))
+	pctx.StaticVariable("Arm64Cppflags", strings.Join(arm64Cppflags, " "))
 
-	pctx.StaticVariable("Arm64ClangArmv8ACflags", strings.Join(arm64ArchVariantCflags["armv8-a"], " "))
-	pctx.StaticVariable("Arm64ClangArmv8ABranchProtCflags", strings.Join(arm64ArchVariantCflags["armv8-a-branchprot"], " "))
-	pctx.StaticVariable("Arm64ClangArmv82ACflags", strings.Join(arm64ArchVariantCflags["armv8-2a"], " "))
-	pctx.StaticVariable("Arm64ClangArmv82ADotprodCflags", strings.Join(arm64ArchVariantCflags["armv8-2a-dotprod"], " "))
+	pctx.StaticVariable("Arm64Armv8ACflags", strings.Join(arm64ArchVariantCflags["armv8-a"], " "))
+	pctx.StaticVariable("Arm64Armv8ABranchProtCflags", strings.Join(arm64ArchVariantCflags["armv8-a-branchprot"], " "))
+	pctx.StaticVariable("Arm64Armv82ACflags", strings.Join(arm64ArchVariantCflags["armv8-2a"], " "))
+	pctx.StaticVariable("Arm64Armv82ADotprodCflags", strings.Join(arm64ArchVariantCflags["armv8-2a-dotprod"], " "))
 
-	pctx.StaticVariable("Arm64ClangCortexA53Cflags",
-		strings.Join(arm64ClangCpuVariantCflags["cortex-a53"], " "))
+	pctx.StaticVariable("Arm64CortexA53Cflags",
+		strings.Join(arm64CpuVariantCflags["cortex-a53"], " "))
 
-	pctx.StaticVariable("Arm64ClangCortexA55Cflags",
-		strings.Join(arm64ClangCpuVariantCflags["cortex-a55"], " "))
+	pctx.StaticVariable("Arm64CortexA55Cflags",
+		strings.Join(arm64CpuVariantCflags["cortex-a55"], " "))
 
-	pctx.StaticVariable("Arm64ClangKryoCflags",
-		strings.Join(arm64ClangCpuVariantCflags["kryo"], " "))
+	pctx.StaticVariable("Arm64KryoCflags",
+		strings.Join(arm64CpuVariantCflags["kryo"], " "))
 
-	pctx.StaticVariable("Arm64ClangExynosM1Cflags",
-		strings.Join(arm64ClangCpuVariantCflags["exynos-m1"], " "))
+	pctx.StaticVariable("Arm64ExynosM1Cflags",
+		strings.Join(arm64CpuVariantCflags["exynos-m1"], " "))
 
-	pctx.StaticVariable("Arm64ClangExynosM2Cflags",
-		strings.Join(arm64ClangCpuVariantCflags["exynos-m2"], " "))
+	pctx.StaticVariable("Arm64ExynosM2Cflags",
+		strings.Join(arm64CpuVariantCflags["exynos-m2"], " "))
 }
 
 var (
-	arm64ClangArchVariantCflagsVar = map[string]string{
-		"armv8-a":            "${config.Arm64ClangArmv8ACflags}",
-		"armv8-a-branchprot": "${config.Arm64ClangArmv8ABranchProtCflags}",
-		"armv8-2a":           "${config.Arm64ClangArmv82ACflags}",
-		"armv8-2a-dotprod":   "${config.Arm64ClangArmv82ADotprodCflags}",
+	arm64ArchVariantCflagsVar = map[string]string{
+		"armv8-a":            "${config.Arm64Armv8ACflags}",
+		"armv8-a-branchprot": "${config.Arm64Armv8ABranchProtCflags}",
+		"armv8-2a":           "${config.Arm64Armv82ACflags}",
+		"armv8-2a-dotprod":   "${config.Arm64Armv82ADotprodCflags}",
 	}
 
-	arm64ClangCpuVariantCflagsVar = map[string]string{
+	arm64CpuVariantCflagsVar = map[string]string{
 		"":           "",
-		"cortex-a53": "${config.Arm64ClangCortexA53Cflags}",
-		"cortex-a55": "${config.Arm64ClangCortexA55Cflags}",
-		"cortex-a72": "${config.Arm64ClangCortexA53Cflags}",
-		"cortex-a73": "${config.Arm64ClangCortexA53Cflags}",
-		"cortex-a75": "${config.Arm64ClangCortexA55Cflags}",
-		"cortex-a76": "${config.Arm64ClangCortexA55Cflags}",
-		"kryo":       "${config.Arm64ClangKryoCflags}",
-		"kryo385":    "${config.Arm64ClangCortexA53Cflags}",
-		"exynos-m1":  "${config.Arm64ClangExynosM1Cflags}",
-		"exynos-m2":  "${config.Arm64ClangExynosM2Cflags}",
+		"cortex-a53": "${config.Arm64CortexA53Cflags}",
+		"cortex-a55": "${config.Arm64CortexA55Cflags}",
+		"cortex-a72": "${config.Arm64CortexA53Cflags}",
+		"cortex-a73": "${config.Arm64CortexA53Cflags}",
+		"cortex-a75": "${config.Arm64CortexA55Cflags}",
+		"cortex-a76": "${config.Arm64CortexA55Cflags}",
+		"kryo":       "${config.Arm64KryoCflags}",
+		"kryo385":    "${config.Arm64CortexA53Cflags}",
+		"exynos-m1":  "${config.Arm64ExynosM1Cflags}",
+		"exynos-m2":  "${config.Arm64ExynosM2Cflags}",
 	}
 )
 
@@ -152,9 +150,9 @@
 	toolchainBionic
 	toolchain64Bit
 
-	ldflags              string
-	lldflags             string
-	toolchainClangCflags string
+	ldflags         string
+	lldflags        string
+	toolchainCflags string
 }
 
 func (t *toolchainArm64) Name() string {
@@ -181,24 +179,24 @@
 	return t.GccTriple()
 }
 
-func (t *toolchainArm64) ClangCflags() string {
-	return "${config.Arm64ClangCflags}"
+func (t *toolchainArm64) Cflags() string {
+	return "${config.Arm64Cflags}"
 }
 
-func (t *toolchainArm64) ClangCppflags() string {
-	return "${config.Arm64ClangCppflags}"
+func (t *toolchainArm64) Cppflags() string {
+	return "${config.Arm64Cppflags}"
 }
 
-func (t *toolchainArm64) ClangLdflags() string {
+func (t *toolchainArm64) Ldflags() string {
 	return t.ldflags
 }
 
-func (t *toolchainArm64) ClangLldflags() string {
+func (t *toolchainArm64) Lldflags() string {
 	return t.lldflags
 }
 
-func (t *toolchainArm64) ToolchainClangCflags() string {
-	return t.toolchainClangCflags
+func (t *toolchainArm64) ToolchainCflags() string {
+	return t.toolchainCflags
 }
 
 func (toolchainArm64) LibclangRuntimeLibraryArch() string {
@@ -216,9 +214,9 @@
 		panic(fmt.Sprintf("Unknown ARM architecture version: %q", arch.ArchVariant))
 	}
 
-	toolchainClangCflags := []string{arm64ClangArchVariantCflagsVar[arch.ArchVariant]}
-	toolchainClangCflags = append(toolchainClangCflags,
-		variantOrDefault(arm64ClangCpuVariantCflagsVar, arch.CpuVariant))
+	toolchainCflags := []string{arm64ArchVariantCflagsVar[arch.ArchVariant]}
+	toolchainCflags = append(toolchainCflags,
+		variantOrDefault(arm64CpuVariantCflagsVar, arch.CpuVariant))
 
 	var extraLdflags string
 	switch arch.CpuVariant {
@@ -235,7 +233,7 @@
 			"${config.Arm64Lldflags}",
 			extraLdflags,
 		}, " "),
-		toolchainClangCflags: strings.Join(toolchainClangCflags, " "),
+		toolchainCflags: strings.Join(toolchainCflags, " "),
 	}
 }
 
diff --git a/cc/config/arm64_fuchsia_device.go b/cc/config/arm64_fuchsia_device.go
index a6b5e8c..5ab27a0 100644
--- a/cc/config/arm64_fuchsia_device.go
+++ b/cc/config/arm64_fuchsia_device.go
@@ -42,47 +42,31 @@
 	return arm64GccVersion
 }
 
-func (t *toolchainFuchsiaArm64) Cflags() string {
-	return ""
-}
-
-func (t *toolchainFuchsiaArm64) Cppflags() string {
-	return ""
-}
-
-func (t *toolchainFuchsiaArm64) Ldflags() string {
-	return "-Wl,--fix-cortex-a53-843419"
-}
-
 func (t *toolchainFuchsiaArm64) IncludeFlags() string {
 	return ""
 }
 
-func (t *toolchainFuchsiaArm64) ToolchainCflags() string {
-	return "-mcpu=cortex-a53"
-}
-
 func (t *toolchainFuchsiaArm64) ClangTriple() string {
 	return "arm64-fuchsia-android"
 }
 
-func (t *toolchainFuchsiaArm64) ClangCppflags() string {
+func (t *toolchainFuchsiaArm64) Cppflags() string {
 	return "-Wno-error=deprecated-declarations"
 }
 
-func (t *toolchainFuchsiaArm64) ClangLdflags() string {
+func (t *toolchainFuchsiaArm64) Ldflags() string {
 	return "--target=arm64-fuchsia --sysroot=" + fuchsiaArm64SysRoot + " -L" + fuchsiaArm64PrebuiltLibsRoot + "/aarch64-fuchsia/lib " + "-Lprebuilts/fuchsia_sdk/arch/arm64/dist/"
 }
 
-func (t *toolchainFuchsiaArm64) ClangLldflags() string {
+func (t *toolchainFuchsiaArm64) Lldflags() string {
 	return "--target=arm64-fuchsia --sysroot=" + fuchsiaArm64SysRoot + " -L" + fuchsiaArm64PrebuiltLibsRoot + "/aarch64-fuchsia/lib " + "-Lprebuilts/fuchsia_sdk/arch/arm64/dist/"
 }
 
-func (t *toolchainFuchsiaArm64) ClangCflags() string {
+func (t *toolchainFuchsiaArm64) Cflags() string {
 	return "--target=arm64-fuchsia --sysroot=" + fuchsiaArm64SysRoot + " -I" + fuchsiaArm64SysRoot + "/include"
 }
 
-func (t *toolchainFuchsiaArm64) ToolchainClangCflags() string {
+func (t *toolchainFuchsiaArm64) ToolchainCflags() string {
 	return "-march=armv8-a"
 }
 
diff --git a/cc/config/arm64_linux_host.go b/cc/config/arm64_linux_host.go
index 83bd799..853d818 100644
--- a/cc/config/arm64_linux_host.go
+++ b/cc/config/arm64_linux_host.go
@@ -15,14 +15,15 @@
 package config
 
 import (
-	"android/soong/android"
 	"strings"
+
+	"android/soong/android"
 )
 
 var (
 	// This is a host toolchain but flags for device toolchain are required
 	// as the flags are actually for Bionic-based builds.
-	linuxCrossCflags = ClangFilterUnknownCflags(append(deviceGlobalCflags,
+	linuxCrossCflags = append(deviceGlobalCflags,
 		// clang by default enables PIC when the clang triple is set to *-android.
 		// See toolchain/llvm-project/clang/lib/Driver/ToolChains/CommonArgs.cpp#920.
 		// However, for this host target, we don't set "-android" to avoid __ANDROID__ macro
@@ -33,9 +34,9 @@
 		// This is normally in ClangExtraTargetCflags, but that's for device and we need
 		// the same for host
 		"-nostdlibinc",
-	))
+	)
 
-	linuxCrossLdflags = ClangFilterUnknownCflags([]string{
+	linuxCrossLdflags = []string{
 		"-Wl,-z,noexecstack",
 		"-Wl,-z,relro",
 		"-Wl,-z,now",
@@ -44,7 +45,7 @@
 		"-Wl,--fatal-warnings",
 		"-Wl,--hash-style=gnu",
 		"-Wl,--no-undefined-version",
-	})
+	}
 
 	// Embed the linker into host bionic binaries. This is needed to support host bionic,
 	// as the linux kernel requires that the ELF interpreter referenced by PT_INTERP be
@@ -73,9 +74,9 @@
 	return "aarch64-linux"
 }
 
-func (toolchainLinuxArm64) ClangCflags() string {
+func (toolchainLinuxArm64) Cflags() string {
 	// The inherited flags + extra flags
-	return "${config.Arm64ClangCflags} ${config.LinuxBionicArm64Cflags}"
+	return "${config.Arm64Cflags} ${config.LinuxBionicArm64Cflags}"
 }
 
 func (toolchainLinuxArm64) CrtBeginSharedBinary() []string {
@@ -84,7 +85,7 @@
 
 func linuxArm64ToolchainFactory(arch android.Arch) Toolchain {
 	archVariant := "armv8-a" // for host, default to armv8-a
-	toolchainClangCflags := []string{arm64ClangArchVariantCflagsVar[archVariant]}
+	toolchainCflags := []string{arm64ArchVariantCflagsVar[archVariant]}
 
 	// We don't specify CPU architecture for host. Conservatively assume
 	// the host CPU needs the fix
@@ -103,7 +104,7 @@
 		"${config.LinuxBionicArm64Ldflags}",
 		extraLdflags,
 	}, " ")
-	ret.toolchainArm64.toolchainClangCflags = strings.Join(toolchainClangCflags, " ")
+	ret.toolchainArm64.toolchainCflags = strings.Join(toolchainCflags, " ")
 	return &ret
 }
 
diff --git a/cc/config/arm_device.go b/cc/config/arm_device.go
index 3c27730..b5afe40 100644
--- a/cc/config/arm_device.go
+++ b/cc/config/arm_device.go
@@ -23,7 +23,6 @@
 
 var (
 	armToolchainCflags = []string{
-		"-mthumb-interwork",
 		"-msoft-float",
 	}
 
@@ -38,7 +37,7 @@
 		"-Wl,-m,armelf",
 	}
 
-	armLldflags = ClangFilterUnknownLldflags(armLdflags)
+	armLldflags = armLdflags
 
 	armArmCflags = []string{
 		"-fstrict-aliasing",
@@ -49,7 +48,7 @@
 		"-Os",
 	}
 
-	armClangArchVariantCflags = map[string][]string{
+	armArchVariantCflags = map[string][]string{
 		"armv7-a": []string{
 			"-march=armv7-a",
 			"-mfloat-abi=softfp",
@@ -72,7 +71,7 @@
 		},
 	}
 
-	armClangCpuVariantCflags = map[string][]string{
+	armCpuVariantCflags = map[string][]string{
 		"cortex-a7": []string{
 			"-mcpu=cortex-a7",
 			"-mfpu=neon-vfpv4",
@@ -181,67 +180,65 @@
 	exportStringListStaticVariable("ArmLldflags", armLldflags)
 
 	// Clang cflags
-	exportStringListStaticVariable("ArmToolchainClangCflags", ClangFilterUnknownCflags(armToolchainCflags))
-	exportStringListStaticVariable("ArmClangCflags", ClangFilterUnknownCflags(armCflags))
-	exportStringListStaticVariable("ArmClangLdflags", ClangFilterUnknownCflags(armLdflags))
-	exportStringListStaticVariable("ArmClangLldflags", ClangFilterUnknownCflags(armLldflags))
-	exportStringListStaticVariable("ArmClangCppflags", ClangFilterUnknownCflags(armCppflags))
+	exportStringListStaticVariable("ArmToolchainCflags", armToolchainCflags)
+	exportStringListStaticVariable("ArmCflags", armCflags)
+	exportStringListStaticVariable("ArmCppflags", armCppflags)
 
 	// Clang ARM vs. Thumb instruction set cflags
-	exportStringListStaticVariable("ArmClangArmCflags", ClangFilterUnknownCflags(armArmCflags))
-	exportStringListStaticVariable("ArmClangThumbCflags", ClangFilterUnknownCflags(armThumbCflags))
+	exportStringListStaticVariable("ArmArmCflags", armArmCflags)
+	exportStringListStaticVariable("ArmThumbCflags", armThumbCflags)
 
 	// Clang arch variant cflags
-	exportStringListStaticVariable("ArmClangArmv7ACflags", armClangArchVariantCflags["armv7-a"])
-	exportStringListStaticVariable("ArmClangArmv7ANeonCflags", armClangArchVariantCflags["armv7-a-neon"])
-	exportStringListStaticVariable("ArmClangArmv8ACflags", armClangArchVariantCflags["armv8-a"])
-	exportStringListStaticVariable("ArmClangArmv82ACflags", armClangArchVariantCflags["armv8-2a"])
+	exportStringListStaticVariable("ArmArmv7ACflags", armArchVariantCflags["armv7-a"])
+	exportStringListStaticVariable("ArmArmv7ANeonCflags", armArchVariantCflags["armv7-a-neon"])
+	exportStringListStaticVariable("ArmArmv8ACflags", armArchVariantCflags["armv8-a"])
+	exportStringListStaticVariable("ArmArmv82ACflags", armArchVariantCflags["armv8-2a"])
 
 	// Clang cpu variant cflags
-	exportStringListStaticVariable("ArmClangGenericCflags", armClangCpuVariantCflags[""])
-	exportStringListStaticVariable("ArmClangCortexA7Cflags", armClangCpuVariantCflags["cortex-a7"])
-	exportStringListStaticVariable("ArmClangCortexA8Cflags", armClangCpuVariantCflags["cortex-a8"])
-	exportStringListStaticVariable("ArmClangCortexA15Cflags", armClangCpuVariantCflags["cortex-a15"])
-	exportStringListStaticVariable("ArmClangCortexA53Cflags", armClangCpuVariantCflags["cortex-a53"])
-	exportStringListStaticVariable("ArmClangCortexA55Cflags", armClangCpuVariantCflags["cortex-a55"])
-	exportStringListStaticVariable("ArmClangKraitCflags", armClangCpuVariantCflags["krait"])
-	exportStringListStaticVariable("ArmClangKryoCflags", armClangCpuVariantCflags["kryo"])
+	exportStringListStaticVariable("ArmGenericCflags", armCpuVariantCflags[""])
+	exportStringListStaticVariable("ArmCortexA7Cflags", armCpuVariantCflags["cortex-a7"])
+	exportStringListStaticVariable("ArmCortexA8Cflags", armCpuVariantCflags["cortex-a8"])
+	exportStringListStaticVariable("ArmCortexA15Cflags", armCpuVariantCflags["cortex-a15"])
+	exportStringListStaticVariable("ArmCortexA53Cflags", armCpuVariantCflags["cortex-a53"])
+	exportStringListStaticVariable("ArmCortexA55Cflags", armCpuVariantCflags["cortex-a55"])
+	exportStringListStaticVariable("ArmKraitCflags", armCpuVariantCflags["krait"])
+	exportStringListStaticVariable("ArmKryoCflags", armCpuVariantCflags["kryo"])
 }
 
 var (
-	armClangArchVariantCflagsVar = map[string]string{
-		"armv7-a":      "${config.ArmClangArmv7ACflags}",
-		"armv7-a-neon": "${config.ArmClangArmv7ANeonCflags}",
-		"armv8-a":      "${config.ArmClangArmv8ACflags}",
-		"armv8-2a":     "${config.ArmClangArmv82ACflags}",
+	armArchVariantCflagsVar = map[string]string{
+		"armv7-a":      "${config.ArmArmv7ACflags}",
+		"armv7-a-neon": "${config.ArmArmv7ANeonCflags}",
+		"armv8-a":      "${config.ArmArmv8ACflags}",
+		"armv8-2a":     "${config.ArmArmv82ACflags}",
 	}
 
-	armClangCpuVariantCflagsVar = map[string]string{
-		"":               "${config.ArmClangGenericCflags}",
-		"cortex-a7":      "${config.ArmClangCortexA7Cflags}",
-		"cortex-a8":      "${config.ArmClangCortexA8Cflags}",
-		"cortex-a15":     "${config.ArmClangCortexA15Cflags}",
-		"cortex-a53":     "${config.ArmClangCortexA53Cflags}",
-		"cortex-a53.a57": "${config.ArmClangCortexA53Cflags}",
-		"cortex-a55":     "${config.ArmClangCortexA55Cflags}",
-		"cortex-a72":     "${config.ArmClangCortexA53Cflags}",
-		"cortex-a73":     "${config.ArmClangCortexA53Cflags}",
-		"cortex-a75":     "${config.ArmClangCortexA55Cflags}",
-		"cortex-a76":     "${config.ArmClangCortexA55Cflags}",
-		"krait":          "${config.ArmClangKraitCflags}",
-		"kryo":           "${config.ArmClangKryoCflags}",
-		"kryo385":        "${config.ArmClangCortexA53Cflags}",
-		"exynos-m1":      "${config.ArmClangCortexA53Cflags}",
-		"exynos-m2":      "${config.ArmClangCortexA53Cflags}",
+	armCpuVariantCflagsVar = map[string]string{
+		"":               "${config.ArmGenericCflags}",
+		"cortex-a7":      "${config.ArmCortexA7Cflags}",
+		"cortex-a8":      "${config.ArmCortexA8Cflags}",
+		"cortex-a15":     "${config.ArmCortexA15Cflags}",
+		"cortex-a53":     "${config.ArmCortexA53Cflags}",
+		"cortex-a53.a57": "${config.ArmCortexA53Cflags}",
+		"cortex-a55":     "${config.ArmCortexA55Cflags}",
+		"cortex-a72":     "${config.ArmCortexA53Cflags}",
+		"cortex-a73":     "${config.ArmCortexA53Cflags}",
+		"cortex-a75":     "${config.ArmCortexA55Cflags}",
+		"cortex-a76":     "${config.ArmCortexA55Cflags}",
+		"krait":          "${config.ArmKraitCflags}",
+		"kryo":           "${config.ArmKryoCflags}",
+		"kryo385":        "${config.ArmCortexA53Cflags}",
+		"exynos-m1":      "${config.ArmCortexA53Cflags}",
+		"exynos-m2":      "${config.ArmCortexA53Cflags}",
 	}
 )
 
 type toolchainArm struct {
 	toolchainBionic
 	toolchain32Bit
-	ldflags              string
-	lldflags             string
-	toolchainClangCflags string
+	ldflags         string
+	lldflags        string
+	toolchainCflags string
 }
 
 func (t *toolchainArm) Name() string {
@@ -274,34 +271,34 @@
 	return t.GccTriple()
 }
 
-func (t *toolchainArm) ToolchainClangCflags() string {
-	return t.toolchainClangCflags
+func (t *toolchainArm) ToolchainCflags() string {
+	return t.toolchainCflags
 }
 
-func (t *toolchainArm) ClangCflags() string {
-	return "${config.ArmClangCflags}"
+func (t *toolchainArm) Cflags() string {
+	return "${config.ArmCflags}"
 }
 
-func (t *toolchainArm) ClangCppflags() string {
-	return "${config.ArmClangCppflags}"
+func (t *toolchainArm) Cppflags() string {
+	return "${config.ArmCppflags}"
 }
 
-func (t *toolchainArm) ClangLdflags() string {
+func (t *toolchainArm) Ldflags() string {
 	return t.ldflags
 }
 
-func (t *toolchainArm) ClangLldflags() string {
+func (t *toolchainArm) Lldflags() string {
 	return t.lldflags // TODO: handle V8 cases
 }
 
-func (t *toolchainArm) ClangInstructionSetFlags(isa string) (string, error) {
+func (t *toolchainArm) InstructionSetFlags(isa string) (string, error) {
 	switch isa {
 	case "arm":
-		return "${config.ArmClangArmCflags}", nil
+		return "${config.ArmArmCflags}", nil
 	case "thumb", "":
-		return "${config.ArmClangThumbCflags}", nil
+		return "${config.ArmThumbCflags}", nil
 	default:
-		return t.toolchainBase.ClangInstructionSetFlags(isa)
+		return t.toolchainBase.InstructionSetFlags(isa)
 	}
 }
 
@@ -311,13 +308,13 @@
 
 func armToolchainFactory(arch android.Arch) Toolchain {
 	var fixCortexA8 string
-	toolchainClangCflags := make([]string, 2, 3)
+	toolchainCflags := make([]string, 2, 3)
 
-	toolchainClangCflags[0] = "${config.ArmToolchainClangCflags}"
-	toolchainClangCflags[1] = armClangArchVariantCflagsVar[arch.ArchVariant]
+	toolchainCflags[0] = "${config.ArmToolchainCflags}"
+	toolchainCflags[1] = armArchVariantCflagsVar[arch.ArchVariant]
 
-	toolchainClangCflags = append(toolchainClangCflags,
-		variantOrDefault(armClangCpuVariantCflagsVar, arch.CpuVariant))
+	toolchainCflags = append(toolchainCflags,
+		variantOrDefault(armCpuVariantCflagsVar, arch.CpuVariant))
 
 	switch arch.ArchVariant {
 	case "armv7-a-neon":
@@ -341,8 +338,8 @@
 			"${config.ArmLdflags}",
 			fixCortexA8,
 		}, " "),
-		lldflags:             "${config.ArmLldflags}",
-		toolchainClangCflags: strings.Join(toolchainClangCflags, " "),
+		lldflags:        "${config.ArmLldflags}",
+		toolchainCflags: strings.Join(toolchainCflags, " "),
 	}
 }
 
diff --git a/cc/config/bp2build.go b/cc/config/bp2build.go
index 19571f1..e7e94a8 100644
--- a/cc/config/bp2build.go
+++ b/cc/config/bp2build.go
@@ -118,7 +118,7 @@
 // quite complex to track depth-first interpolations. It's also unlikely the
 // interpolation stacks are deep (n > 1).
 func expandVar(toExpand string, stringScope exportedStringVariables, stringListScope exportedStringListVariables) []string {
-	// e.g. "${ClangExternalCflags}"
+	// e.g. "${ExternalCflags}"
 	r := regexp.MustCompile(`\${([a-zA-Z0-9_]+)}`)
 
 	// Internal recursive function.
diff --git a/cc/config/clang.go b/cc/config/clang.go
index c484fc9..9cfe28f 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -15,9 +15,10 @@
 package config
 
 import (
-	"android/soong/android"
 	"sort"
 	"strings"
+
+	"android/soong/android"
 )
 
 // Cflags that should be filtered out when compiling with clang
@@ -80,12 +81,6 @@
 	"--enable-stdcall-fixup",
 })
 
-// Ldflags that should be filtered out when linking with clang lld
-var ClangUnknownLldflags = sorted([]string{
-	"-Wl,--fix-cortex-a8",
-	"-Wl,--no-fix-cortex-a8",
-})
-
 var ClangLibToolingUnknownCflags = sorted([]string{})
 
 // List of tidy checks that should be disabled globally. When the compiler is
@@ -153,80 +148,6 @@
 		"-D__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__",
 	})
 
-	exportStringListStaticVariable("ClangExtraCppflags", []string{
-		// -Wimplicit-fallthrough is not enabled by -Wall.
-		"-Wimplicit-fallthrough",
-
-		// Enable clang's thread-safety annotations in libcxx.
-		"-D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS",
-
-		// libc++'s math.h has an #include_next outside of system_headers.
-		"-Wno-gnu-include-next",
-	})
-
-	exportStringListStaticVariable("ClangExtraTargetCflags", []string{"-nostdlibinc"})
-
-	exportStringListStaticVariable("ClangExtraNoOverrideCflags", []string{
-		"-Werror=address-of-temporary",
-		// Bug: http://b/29823425 Disable -Wnull-dereference until the
-		// new cases detected by this warning in Clang r271374 are
-		// fixed.
-		//"-Werror=null-dereference",
-		"-Werror=return-type",
-
-		// http://b/72331526 Disable -Wtautological-* until the instances detected by these
-		// new warnings are fixed.
-		"-Wno-tautological-constant-compare",
-		"-Wno-tautological-type-limit-compare",
-		// http://b/145210666
-		"-Wno-reorder-init-list",
-		// http://b/145211066
-		"-Wno-implicit-int-float-conversion",
-		// New warnings to be fixed after clang-r377782.
-		"-Wno-int-in-bool-context",          // http://b/148287349
-		"-Wno-sizeof-array-div",             // http://b/148815709
-		"-Wno-tautological-overlap-compare", // http://b/148815696
-		// New warnings to be fixed after clang-r383902.
-		"-Wno-deprecated-copy",                      // http://b/153746672
-		"-Wno-range-loop-construct",                 // http://b/153747076
-		"-Wno-misleading-indentation",               // http://b/153746954
-		"-Wno-zero-as-null-pointer-constant",        // http://b/68236239
-		"-Wno-deprecated-anon-enum-enum-conversion", // http://b/153746485
-		"-Wno-deprecated-enum-enum-conversion",      // http://b/153746563
-		"-Wno-string-compare",                       // http://b/153764102
-		"-Wno-enum-enum-conversion",                 // http://b/154138986
-		"-Wno-enum-float-conversion",                // http://b/154255917
-		"-Wno-pessimizing-move",                     // http://b/154270751
-		// New warnings to be fixed after clang-r399163
-		"-Wno-non-c-typedef-for-linkage", // http://b/161304145
-		// New warnings to be fixed after clang-r407598
-		"-Wno-string-concatenation", // http://b/175068488
-	})
-
-	// Extra cflags for external third-party projects to disable warnings that
-	// are infeasible to fix in all the external projects and their upstream repos.
-	exportStringListStaticVariable("ClangExtraExternalCflags", []string{
-		"-Wno-enum-compare",
-		"-Wno-enum-compare-switch",
-
-		// http://b/72331524 Allow null pointer arithmetic until the instances detected by
-		// this new warning are fixed.
-		"-Wno-null-pointer-arithmetic",
-
-		// Bug: http://b/29823425 Disable -Wnull-dereference until the
-		// new instances detected by this warning are fixed.
-		"-Wno-null-dereference",
-
-		// http://b/145211477
-		"-Wno-pointer-compare",
-		// http://b/145211022
-		"-Wno-xor-used-as-pow",
-		// http://b/145211022
-		"-Wno-final-dtor-non-final-class",
-
-		// http://b/165945989
-		"-Wno-psabi",
-	})
 }
 
 func ClangFilterUnknownCflags(cflags []string) []string {
@@ -255,26 +176,10 @@
 	return result
 }
 
-func ClangFilterUnknownLldflags(lldflags []string) []string {
-	result, _ := android.FilterList(lldflags, ClangUnknownLldflags)
-	return result
-}
-
 func ClangLibToolingFilterUnknownCflags(libToolingFlags []string) []string {
 	return android.RemoveListFromList(libToolingFlags, ClangLibToolingUnknownCflags)
 }
 
-func inListSorted(s string, list []string) bool {
-	for _, l := range list {
-		if s == l {
-			return true
-		} else if s < l {
-			return false
-		}
-	}
-	return false
-}
-
 func sorted(list []string) []string {
 	sort.Strings(list)
 	return list
diff --git a/cc/config/global.go b/cc/config/global.go
index 4957767..bcee06a 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -36,7 +36,6 @@
 
 		// Make paths in deps files relative
 		"-no-canonical-prefixes",
-		"-fno-canonical-system-headers",
 
 		"-DNDEBUG",
 		"-UDEBUG",
@@ -61,8 +60,6 @@
 	commonGlobalConlyflags = []string{}
 
 	deviceGlobalCflags = []string{
-		"-fdiagnostics-color",
-
 		"-ffunction-sections",
 		"-fdata-sections",
 		"-fno-short-enums",
@@ -78,6 +75,7 @@
 		"-Werror=address",
 		"-Werror=sequence-point",
 		"-Werror=format-security",
+		"-nostdlibinc",
 	}
 
 	deviceGlobalCppflags = []string{
@@ -101,7 +99,7 @@
 		"-Wl,--icf=safe",
 	}
 
-	deviceGlobalLldflags = append(ClangFilterUnknownLldflags(deviceGlobalLdflags),
+	deviceGlobalLldflags = append(deviceGlobalLdflags,
 		[]string{
 			"-fuse-ld=lld",
 		}...)
@@ -116,6 +114,15 @@
 
 	commonGlobalCppflags = []string{
 		"-Wsign-promo",
+
+		// -Wimplicit-fallthrough is not enabled by -Wall.
+		"-Wimplicit-fallthrough",
+
+		// Enable clang's thread-safety annotations in libcxx.
+		"-D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS",
+
+		// libc++'s math.h has an #include_next outside of system_headers.
+		"-Wno-gnu-include-next",
 	}
 
 	noOverrideGlobalCflags = []string{
@@ -133,6 +140,66 @@
 		// http://b/161386391 for -Wno-pointer-to-int-cast
 		"-Wno-pointer-to-int-cast",
 		"-Werror=fortify-source",
+
+		"-Werror=address-of-temporary",
+		// Bug: http://b/29823425 Disable -Wnull-dereference until the
+		// new cases detected by this warning in Clang r271374 are
+		// fixed.
+		//"-Werror=null-dereference",
+		"-Werror=return-type",
+
+		// http://b/72331526 Disable -Wtautological-* until the instances detected by these
+		// new warnings are fixed.
+		"-Wno-tautological-constant-compare",
+		"-Wno-tautological-type-limit-compare",
+		// http://b/145210666
+		"-Wno-reorder-init-list",
+		// http://b/145211066
+		"-Wno-implicit-int-float-conversion",
+		// New warnings to be fixed after clang-r377782.
+		"-Wno-int-in-bool-context",          // http://b/148287349
+		"-Wno-sizeof-array-div",             // http://b/148815709
+		"-Wno-tautological-overlap-compare", // http://b/148815696
+		// New warnings to be fixed after clang-r383902.
+		"-Wno-deprecated-copy",                      // http://b/153746672
+		"-Wno-range-loop-construct",                 // http://b/153747076
+		"-Wno-misleading-indentation",               // http://b/153746954
+		"-Wno-zero-as-null-pointer-constant",        // http://b/68236239
+		"-Wno-deprecated-anon-enum-enum-conversion", // http://b/153746485
+		"-Wno-deprecated-enum-enum-conversion",      // http://b/153746563
+		"-Wno-string-compare",                       // http://b/153764102
+		"-Wno-enum-enum-conversion",                 // http://b/154138986
+		"-Wno-enum-float-conversion",                // http://b/154255917
+		"-Wno-pessimizing-move",                     // http://b/154270751
+		// New warnings to be fixed after clang-r399163
+		"-Wno-non-c-typedef-for-linkage", // http://b/161304145
+		// New warnings to be fixed after clang-r407598
+		"-Wno-string-concatenation", // http://b/175068488
+	}
+
+	// Extra cflags for external third-party projects to disable warnings that
+	// are infeasible to fix in all the external projects and their upstream repos.
+	extraExternalCflags = []string{
+		"-Wno-enum-compare",
+		"-Wno-enum-compare-switch",
+
+		// http://b/72331524 Allow null pointer arithmetic until the instances detected by
+		// this new warning are fixed.
+		"-Wno-null-pointer-arithmetic",
+
+		// Bug: http://b/29823425 Disable -Wnull-dereference until the
+		// new instances detected by this warning are fixed.
+		"-Wno-null-dereference",
+
+		// http://b/145211477
+		"-Wno-pointer-compare",
+		// http://b/145211022
+		"-Wno-xor-used-as-pow",
+		// http://b/145211022
+		"-Wno-final-dtor-non-final-class",
+
+		// http://b/165945989
+		"-Wno-psabi",
 	}
 
 	IllegalFlags = []string{
@@ -174,20 +241,20 @@
 	exportStringListStaticVariable("HostGlobalLdflags", hostGlobalLdflags)
 	exportStringListStaticVariable("HostGlobalLldflags", hostGlobalLldflags)
 
-	// Export the static default CommonClangGlobalCflags to Bazel.
+	// Export the static default CommonGlobalCflags to Bazel.
 	// TODO(187086342): handle cflags that are set in VariableFuncs.
-	commonClangGlobalCFlags := append(
-		ClangFilterUnknownCflags(commonGlobalCflags),
+	bazelCommonGlobalCflags := append(
+		commonGlobalCflags,
 		[]string{
 			"${ClangExtraCflags}",
 			// Default to zero initialization.
 			"-ftrivial-auto-var-init=zero",
 			"-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang",
 		}...)
-	exportedStringListVars.Set("CommonClangGlobalCflags", commonClangGlobalCFlags)
+	exportedStringListVars.Set("CommonGlobalCflags", bazelCommonGlobalCflags)
 
-	pctx.VariableFunc("CommonClangGlobalCflags", func(ctx android.PackageVarContext) string {
-		flags := ClangFilterUnknownCflags(commonGlobalCflags)
+	pctx.VariableFunc("CommonGlobalCflags", func(ctx android.PackageVarContext) string {
+		flags := commonGlobalCflags
 		flags = append(flags, "${ClangExtraCflags}")
 
 		// http://b/131390872
@@ -206,23 +273,18 @@
 		return strings.Join(flags, " ")
 	})
 
-	// Export the static default DeviceClangGlobalCflags to Bazel.
+	// Export the static default DeviceGlobalCflags to Bazel.
 	// TODO(187086342): handle cflags that are set in VariableFuncs.
-	deviceClangGlobalCflags := append(ClangFilterUnknownCflags(deviceGlobalCflags), "${ClangExtraTargetCflags}")
-	exportedStringListVars.Set("DeviceClangGlobalCflags", deviceClangGlobalCflags)
+	exportedStringListVars.Set("DeviceGlobalCflags", deviceGlobalCflags)
 
-	pctx.VariableFunc("DeviceClangGlobalCflags", func(ctx android.PackageVarContext) string {
-		if ctx.Config().Fuchsia() {
-			return strings.Join(ClangFilterUnknownCflags(deviceGlobalCflags), " ")
-		} else {
-			return strings.Join(deviceClangGlobalCflags, " ")
-		}
+	pctx.VariableFunc("DeviceGlobalCflags", func(ctx android.PackageVarContext) string {
+		return strings.Join(deviceGlobalCflags, " ")
 	})
 
-	exportStringListStaticVariable("HostClangGlobalCflags", ClangFilterUnknownCflags(hostGlobalCflags))
-	exportStringListStaticVariable("NoOverrideClangGlobalCflags", append(ClangFilterUnknownCflags(noOverrideGlobalCflags), "${ClangExtraNoOverrideCflags}"))
-	exportStringListStaticVariable("CommonClangGlobalCppflags", append(ClangFilterUnknownCflags(commonGlobalCppflags), "${ClangExtraCppflags}"))
-	exportStringListStaticVariable("ClangExternalCflags", []string{"${ClangExtraExternalCflags}"})
+	exportStringListStaticVariable("HostGlobalCflags", hostGlobalCflags)
+	exportStringListStaticVariable("NoOverrideGlobalCflags", noOverrideGlobalCflags)
+	exportStringListStaticVariable("CommonGlobalCppflags", commonGlobalCppflags)
+	exportStringListStaticVariable("ExternalCflags", extraExternalCflags)
 
 	// Everything in these lists is a crime against abstraction and dependency tracking.
 	// Do not add anything to this list.
diff --git a/cc/config/toolchain.go b/cc/config/toolchain.go
index ab09751..ff556f1 100644
--- a/cc/config/toolchain.go
+++ b/cc/config/toolchain.go
@@ -82,14 +82,14 @@
 	IncludeFlags() string
 
 	ClangTriple() string
-	ToolchainClangCflags() string
-	ToolchainClangLdflags() string
-	ClangAsflags() string
-	ClangCflags() string
-	ClangCppflags() string
-	ClangLdflags() string
-	ClangLldflags() string
-	ClangInstructionSetFlags(string) (string, error)
+	ToolchainCflags() string
+	ToolchainLdflags() string
+	Asflags() string
+	Cflags() string
+	Cppflags() string
+	Ldflags() string
+	Lldflags() string
+	InstructionSetFlags(string) (string, error)
 
 	ndkTriple() string
 
@@ -136,18 +136,18 @@
 	return triple
 }
 
-func (toolchainBase) ClangInstructionSetFlags(s string) (string, error) {
+func (toolchainBase) InstructionSetFlags(s string) (string, error) {
 	if s != "" {
 		return "", fmt.Errorf("instruction_set: %s is not a supported instruction set", s)
 	}
 	return "", nil
 }
 
-func (toolchainBase) ToolchainClangCflags() string {
+func (toolchainBase) ToolchainCflags() string {
 	return ""
 }
 
-func (toolchainBase) ToolchainClangLdflags() string {
+func (toolchainBase) ToolchainLdflags() string {
 	return ""
 }
 
@@ -159,7 +159,7 @@
 	return ""
 }
 
-func (toolchainBase) ClangAsflags() string {
+func (toolchainBase) Asflags() string {
 	return ""
 }
 
diff --git a/cc/config/x86_64_device.go b/cc/config/x86_64_device.go
index 54dc6d5..c4f47a7 100644
--- a/cc/config/x86_64_device.go
+++ b/cc/config/x86_64_device.go
@@ -32,8 +32,6 @@
 		"-Wl,--hash-style=gnu",
 	}
 
-	x86_64Lldflags = ClangFilterUnknownLldflags(x86_64Ldflags)
-
 	x86_64ArchVariantCflags = map[string][]string{
 		"": []string{
 			"-march=x86-64",
@@ -102,13 +100,11 @@
 	pctx.StaticVariable("X86_64ToolchainLdflags", "-m64")
 
 	pctx.StaticVariable("X86_64Ldflags", strings.Join(x86_64Ldflags, " "))
-	pctx.StaticVariable("X86_64Lldflags", strings.Join(x86_64Lldflags, " "))
+	pctx.StaticVariable("X86_64Lldflags", strings.Join(x86_64Ldflags, " "))
 
 	// Clang cflags
-	pctx.StaticVariable("X86_64ClangCflags", strings.Join(ClangFilterUnknownCflags(x86_64Cflags), " "))
-	pctx.StaticVariable("X86_64ClangLdflags", strings.Join(ClangFilterUnknownCflags(x86_64Ldflags), " "))
-	pctx.StaticVariable("X86_64ClangLldflags", strings.Join(ClangFilterUnknownCflags(x86_64Lldflags), " "))
-	pctx.StaticVariable("X86_64ClangCppflags", strings.Join(ClangFilterUnknownCflags(x86_64Cppflags), " "))
+	pctx.StaticVariable("X86_64Cflags", strings.Join(x86_64Cflags, " "))
+	pctx.StaticVariable("X86_64Cppflags", strings.Join(x86_64Cppflags, " "))
 
 	// Yasm flags
 	pctx.StaticVariable("X86_64YasmFlags", "-f elf64 -m amd64")
@@ -117,15 +113,15 @@
 
 	// Architecture variant cflags
 	for variant, cflags := range x86_64ArchVariantCflags {
-		pctx.StaticVariable("X86_64"+variant+"VariantClangCflags",
-			strings.Join(ClangFilterUnknownCflags(cflags), " "))
+		pctx.StaticVariable("X86_64"+variant+"VariantCflags",
+			strings.Join(cflags, " "))
 	}
 }
 
 type toolchainX86_64 struct {
 	toolchainBionic
 	toolchain64Bit
-	toolchainClangCflags string
+	toolchainCflags string
 }
 
 func (t *toolchainX86_64) Name() string {
@@ -152,27 +148,27 @@
 	return t.GccTriple()
 }
 
-func (t *toolchainX86_64) ToolchainClangLdflags() string {
+func (t *toolchainX86_64) ToolchainLdflags() string {
 	return "${config.X86_64ToolchainLdflags}"
 }
 
-func (t *toolchainX86_64) ToolchainClangCflags() string {
-	return t.toolchainClangCflags
+func (t *toolchainX86_64) ToolchainCflags() string {
+	return t.toolchainCflags
 }
 
-func (t *toolchainX86_64) ClangCflags() string {
-	return "${config.X86_64ClangCflags}"
+func (t *toolchainX86_64) Cflags() string {
+	return "${config.X86_64Cflags}"
 }
 
-func (t *toolchainX86_64) ClangCppflags() string {
-	return "${config.X86_64ClangCppflags}"
+func (t *toolchainX86_64) Cppflags() string {
+	return "${config.X86_64Cppflags}"
 }
 
-func (t *toolchainX86_64) ClangLdflags() string {
+func (t *toolchainX86_64) Ldflags() string {
 	return "${config.X86_64Ldflags}"
 }
 
-func (t *toolchainX86_64) ClangLldflags() string {
+func (t *toolchainX86_64) Lldflags() string {
 	return "${config.X86_64Lldflags}"
 }
 
@@ -185,17 +181,17 @@
 }
 
 func x86_64ToolchainFactory(arch android.Arch) Toolchain {
-	toolchainClangCflags := []string{
+	toolchainCflags := []string{
 		"${config.X86_64ToolchainCflags}",
-		"${config.X86_64" + arch.ArchVariant + "VariantClangCflags}",
+		"${config.X86_64" + arch.ArchVariant + "VariantCflags}",
 	}
 
 	for _, feature := range arch.ArchFeatures {
-		toolchainClangCflags = append(toolchainClangCflags, x86_64ArchFeatureCflags[feature]...)
+		toolchainCflags = append(toolchainCflags, x86_64ArchFeatureCflags[feature]...)
 	}
 
 	return &toolchainX86_64{
-		toolchainClangCflags: strings.Join(toolchainClangCflags, " "),
+		toolchainCflags: strings.Join(toolchainCflags, " "),
 	}
 }
 
diff --git a/cc/config/x86_64_fuchsia_device.go b/cc/config/x86_64_fuchsia_device.go
index d6837c8..86558a6 100644
--- a/cc/config/x86_64_fuchsia_device.go
+++ b/cc/config/x86_64_fuchsia_device.go
@@ -46,18 +46,6 @@
 	return x86_64GccVersion
 }
 
-func (t *toolchainFuchsiaX8664) Cflags() string {
-	return ""
-}
-
-func (t *toolchainFuchsiaX8664) Cppflags() string {
-	return ""
-}
-
-func (t *toolchainFuchsiaX8664) Ldflags() string {
-	return ""
-}
-
 func (t *toolchainFuchsiaX8664) IncludeFlags() string {
 	return ""
 }
@@ -66,20 +54,20 @@
 	return "x86_64-fuchsia-android"
 }
 
-func (t *toolchainFuchsiaX8664) ClangCppflags() string {
+func (t *toolchainFuchsiaX8664) Cppflags() string {
 	return "-Wno-error=deprecated-declarations"
 }
 
-func (t *toolchainFuchsiaX8664) ClangLdflags() string {
+func (t *toolchainFuchsiaX8664) Ldflags() string {
 	return "--target=x86_64-fuchsia --sysroot=" + fuchsiaSysRoot + " -L" + fuchsiaPrebuiltLibsRoot + "/x86_64-fuchsia/lib " + "-Lprebuilts/fuchsia_sdk/arch/x64/dist/"
 
 }
 
-func (t *toolchainFuchsiaX8664) ClangLldflags() string {
+func (t *toolchainFuchsiaX8664) Lldflags() string {
 	return "--target=x86_64-fuchsia --sysroot=" + fuchsiaSysRoot + " -L" + fuchsiaPrebuiltLibsRoot + "/x86_64-fuchsia/lib " + "-Lprebuilts/fuchsia_sdk/arch/x64/dist/"
 }
 
-func (t *toolchainFuchsiaX8664) ClangCflags() string {
+func (t *toolchainFuchsiaX8664) Cflags() string {
 	return "--target=x86_64-fuchsia --sysroot=" + fuchsiaSysRoot + " -I" + fuchsiaSysRoot + "/include"
 }
 
@@ -87,7 +75,7 @@
 	return "-f elf64 -m amd64"
 }
 
-func (t *toolchainFuchsiaX8664) ToolchainClangCflags() string {
+func (t *toolchainFuchsiaX8664) ToolchainCflags() string {
 	return "-mssse3"
 }
 
diff --git a/cc/config/x86_darwin_host.go b/cc/config/x86_darwin_host.go
index 4e3e2a6..d8e70e1 100644
--- a/cc/config/x86_darwin_host.go
+++ b/cc/config/x86_darwin_host.go
@@ -26,8 +26,6 @@
 
 var (
 	darwinCflags = []string{
-		"-fdiagnostics-color",
-
 		"-fPIC",
 		"-funwind-tables",
 
@@ -41,6 +39,9 @@
 		"-DMACOSX_DEPLOYMENT_TARGET=${macMinVersion}",
 
 		"-m64",
+
+		"-integrated-as",
+		"-fstack-protector-strong",
 	}
 
 	darwinLdflags = []string{
@@ -50,15 +51,6 @@
 		"-m64",
 	}
 
-	darwinClangCflags = append(ClangFilterUnknownCflags(darwinCflags), []string{
-		"-integrated-as",
-		"-fstack-protector-strong",
-	}...)
-
-	darwinClangLdflags = ClangFilterUnknownCflags(darwinLdflags)
-
-	darwinClangLldflags = ClangFilterUnknownLldflags(darwinClangLdflags)
-
 	darwinSupportedSdkVersions = []string{
 		"10.10",
 		"10.11",
@@ -115,9 +107,9 @@
 
 	pctx.StaticVariable("DarwinGccTriple", "i686-apple-darwin11")
 
-	pctx.StaticVariable("DarwinClangCflags", strings.Join(darwinClangCflags, " "))
-	pctx.StaticVariable("DarwinClangLdflags", strings.Join(darwinClangLdflags, " "))
-	pctx.StaticVariable("DarwinClangLldflags", strings.Join(darwinClangLldflags, " "))
+	pctx.StaticVariable("DarwinCflags", strings.Join(darwinCflags, " "))
+	pctx.StaticVariable("DarwinLdflags", strings.Join(darwinLdflags, " "))
+	pctx.StaticVariable("DarwinLldflags", strings.Join(darwinLdflags, " "))
 
 	pctx.StaticVariable("DarwinYasmFlags", "-f macho -m amd64")
 }
@@ -213,20 +205,20 @@
 	return "x86_64-apple-darwin"
 }
 
-func (t *toolchainDarwin) ClangCflags() string {
-	return "${config.DarwinClangCflags}"
+func (t *toolchainDarwin) Cflags() string {
+	return "${config.DarwinCflags}"
 }
 
-func (t *toolchainDarwin) ClangCppflags() string {
+func (t *toolchainDarwin) Cppflags() string {
 	return ""
 }
 
-func (t *toolchainDarwin) ClangLdflags() string {
-	return "${config.DarwinClangLdflags}"
+func (t *toolchainDarwin) Ldflags() string {
+	return "${config.DarwinLdflags}"
 }
 
-func (t *toolchainDarwin) ClangLldflags() string {
-	return "${config.DarwinClangLldflags}"
+func (t *toolchainDarwin) Lldflags() string {
+	return "${config.DarwinLldflags}"
 }
 
 func (t *toolchainDarwin) YasmFlags() string {
diff --git a/cc/config/x86_device.go b/cc/config/x86_device.go
index 1507d98..5e510a4 100644
--- a/cc/config/x86_device.go
+++ b/cc/config/x86_device.go
@@ -21,16 +21,14 @@
 )
 
 var (
-	x86Cflags = []string{}
-
-	x86ClangCflags = append(x86Cflags, []string{
+	x86Cflags = []string{
 		"-msse3",
 
 		// -mstackrealign is needed to realign stack in native code
 		// that could be called from JNI, so that movaps instruction
 		// will work on assumed stack aligned local variables.
 		"-mstackrealign",
-	}...)
+	}
 
 	x86Cppflags = []string{}
 
@@ -38,8 +36,6 @@
 		"-Wl,--hash-style=gnu",
 	}
 
-	x86Lldflags = ClangFilterUnknownLldflags(x86Ldflags)
-
 	x86ArchVariantCflags = map[string][]string{
 		"": []string{
 			"-march=prescott",
@@ -49,35 +45,27 @@
 		},
 		"atom": []string{
 			"-march=atom",
-			"-mfpmath=sse",
 		},
 		"broadwell": []string{
 			"-march=broadwell",
-			"-mfpmath=sse",
 		},
 		"haswell": []string{
 			"-march=core-avx2",
-			"-mfpmath=sse",
 		},
 		"ivybridge": []string{
 			"-march=core-avx-i",
-			"-mfpmath=sse",
 		},
 		"sandybridge": []string{
 			"-march=corei7",
-			"-mfpmath=sse",
 		},
 		"silvermont": []string{
 			"-march=slm",
-			"-mfpmath=sse",
 		},
 		"skylake": []string{
 			"-march=skylake",
-			"-mfpmath=sse",
 		},
 		"stoneyridge": []string{
 			"-march=bdver4",
-			"-mfpmath=sse",
 		},
 	}
 
@@ -113,13 +101,11 @@
 	pctx.StaticVariable("X86ToolchainLdflags", "-m32")
 
 	pctx.StaticVariable("X86Ldflags", strings.Join(x86Ldflags, " "))
-	pctx.StaticVariable("X86Lldflags", strings.Join(x86Lldflags, " "))
+	pctx.StaticVariable("X86Lldflags", strings.Join(x86Ldflags, " "))
 
 	// Clang cflags
-	pctx.StaticVariable("X86ClangCflags", strings.Join(ClangFilterUnknownCflags(x86ClangCflags), " "))
-	pctx.StaticVariable("X86ClangLdflags", strings.Join(ClangFilterUnknownCflags(x86Ldflags), " "))
-	pctx.StaticVariable("X86ClangLldflags", strings.Join(ClangFilterUnknownCflags(x86Lldflags), " "))
-	pctx.StaticVariable("X86ClangCppflags", strings.Join(ClangFilterUnknownCflags(x86Cppflags), " "))
+	pctx.StaticVariable("X86Cflags", strings.Join(x86Cflags, " "))
+	pctx.StaticVariable("X86Cppflags", strings.Join(x86Cppflags, " "))
 
 	// Yasm flags
 	pctx.StaticVariable("X86YasmFlags", "-f elf32 -m x86")
@@ -128,15 +114,15 @@
 
 	// Architecture variant cflags
 	for variant, cflags := range x86ArchVariantCflags {
-		pctx.StaticVariable("X86"+variant+"VariantClangCflags",
-			strings.Join(ClangFilterUnknownCflags(cflags), " "))
+		pctx.StaticVariable("X86"+variant+"VariantCflags",
+			strings.Join(cflags, " "))
 	}
 }
 
 type toolchainX86 struct {
 	toolchainBionic
 	toolchain32Bit
-	toolchainClangCflags string
+	toolchainCflags string
 }
 
 func (t *toolchainX86) Name() string {
@@ -163,27 +149,27 @@
 	return "i686-linux-android"
 }
 
-func (t *toolchainX86) ToolchainClangLdflags() string {
+func (t *toolchainX86) ToolchainLdflags() string {
 	return "${config.X86ToolchainLdflags}"
 }
 
-func (t *toolchainX86) ToolchainClangCflags() string {
-	return t.toolchainClangCflags
+func (t *toolchainX86) ToolchainCflags() string {
+	return t.toolchainCflags
 }
 
-func (t *toolchainX86) ClangCflags() string {
-	return "${config.X86ClangCflags}"
+func (t *toolchainX86) Cflags() string {
+	return "${config.X86Cflags}"
 }
 
-func (t *toolchainX86) ClangCppflags() string {
-	return "${config.X86ClangCppflags}"
+func (t *toolchainX86) Cppflags() string {
+	return "${config.X86Cppflags}"
 }
 
-func (t *toolchainX86) ClangLdflags() string {
+func (t *toolchainX86) Ldflags() string {
 	return "${config.X86Ldflags}"
 }
 
-func (t *toolchainX86) ClangLldflags() string {
+func (t *toolchainX86) Lldflags() string {
 	return "${config.X86Lldflags}"
 }
 
@@ -196,17 +182,17 @@
 }
 
 func x86ToolchainFactory(arch android.Arch) Toolchain {
-	toolchainClangCflags := []string{
+	toolchainCflags := []string{
 		"${config.X86ToolchainCflags}",
-		"${config.X86" + arch.ArchVariant + "VariantClangCflags}",
+		"${config.X86" + arch.ArchVariant + "VariantCflags}",
 	}
 
 	for _, feature := range arch.ArchFeatures {
-		toolchainClangCflags = append(toolchainClangCflags, x86ArchFeatureCflags[feature]...)
+		toolchainCflags = append(toolchainCflags, x86ArchFeatureCflags[feature]...)
 	}
 
 	return &toolchainX86{
-		toolchainClangCflags: strings.Join(toolchainClangCflags, " "),
+		toolchainCflags: strings.Join(toolchainCflags, " "),
 	}
 }
 
diff --git a/cc/config/x86_linux_bionic_host.go b/cc/config/x86_linux_bionic_host.go
index e7e5f2d..4b7ba6a 100644
--- a/cc/config/x86_linux_bionic_host.go
+++ b/cc/config/x86_linux_bionic_host.go
@@ -21,9 +21,7 @@
 )
 
 var (
-	linuxBionicCflags = ClangFilterUnknownCflags([]string{
-		"-fdiagnostics-color",
-
+	linuxBionicCflags = []string{
 		"-Wa,--noexecstack",
 
 		"-fPIC",
@@ -34,21 +32,17 @@
 
 		// From x86_64_device
 		"-ffunction-sections",
-		"-finline-functions",
-		"-finline-limit=300",
 		"-fno-short-enums",
-		"-funswitch-loops",
 		"-funwind-tables",
-		"-fno-canonical-system-headers",
 
 		// Tell clang where the gcc toolchain is
 		"--gcc-toolchain=${LinuxBionicGccRoot}",
 
 		// This is normally in ClangExtraTargetCflags, but this is considered host
 		"-nostdlibinc",
-	})
+	}
 
-	linuxBionicLdflags = ClangFilterUnknownCflags([]string{
+	linuxBionicLdflags = []string{
 		"-Wl,-z,noexecstack",
 		"-Wl,-z,relro",
 		"-Wl,-z,now",
@@ -60,9 +54,7 @@
 
 		// Use the device gcc toolchain
 		"--gcc-toolchain=${LinuxBionicGccRoot}",
-	})
-
-	linuxBionicLldflags = ClangFilterUnknownLldflags(linuxBionicLdflags)
+	}
 
 	// Embed the linker into host bionic binaries. This is needed to support host bionic,
 	// as the linux kernel requires that the ELF interpreter referenced by PT_INTERP be
@@ -78,7 +70,7 @@
 func init() {
 	pctx.StaticVariable("LinuxBionicCflags", strings.Join(linuxBionicCflags, " "))
 	pctx.StaticVariable("LinuxBionicLdflags", strings.Join(linuxBionicLdflags, " "))
-	pctx.StaticVariable("LinuxBionicLldflags", strings.Join(linuxBionicLldflags, " "))
+	pctx.StaticVariable("LinuxBionicLldflags", strings.Join(linuxBionicLdflags, " "))
 
 	// Use the device gcc toolchain for now
 	pctx.StaticVariable("LinuxBionicGccRoot", "${X86_64GccRoot}")
@@ -114,29 +106,29 @@
 	return "x86_64-linux-android"
 }
 
-func (t *toolchainLinuxBionic) ClangCflags() string {
+func (t *toolchainLinuxBionic) Cflags() string {
 	return "${config.LinuxBionicCflags}"
 }
 
-func (t *toolchainLinuxBionic) ClangCppflags() string {
+func (t *toolchainLinuxBionic) Cppflags() string {
 	return ""
 }
 
-func (t *toolchainLinuxBionic) ClangLdflags() string {
+func (t *toolchainLinuxBionic) Ldflags() string {
 	return "${config.LinuxBionicLdflags}"
 }
 
-func (t *toolchainLinuxBionic) ClangLldflags() string {
+func (t *toolchainLinuxBionic) Lldflags() string {
 	return "${config.LinuxBionicLldflags}"
 }
 
-func (t *toolchainLinuxBionic) ToolchainClangCflags() string {
+func (t *toolchainLinuxBionic) ToolchainCflags() string {
 	return "-m64 -march=x86-64" +
 		// TODO: We're not really android, but we don't have a triple yet b/31393676
 		" -U__ANDROID__"
 }
 
-func (t *toolchainLinuxBionic) ToolchainClangLdflags() string {
+func (t *toolchainLinuxBionic) ToolchainLdflags() string {
 	return "-m64"
 }
 
diff --git a/cc/config/x86_linux_host.go b/cc/config/x86_linux_host.go
index c406c88..85d95d8 100644
--- a/cc/config/x86_linux_host.go
+++ b/cc/config/x86_linux_host.go
@@ -22,8 +22,6 @@
 
 var (
 	linuxCflags = []string{
-		"-fdiagnostics-color",
-
 		"-Wa,--noexecstack",
 
 		"-fPIC",
@@ -36,6 +34,10 @@
 		//See bug 12708004.
 		"-D__STDC_FORMAT_MACROS",
 		"-D__STDC_CONSTANT_MACROS",
+
+		"--gcc-toolchain=${LinuxGccRoot}",
+		"--sysroot ${LinuxGccRoot}/sysroot",
+		"-fstack-protector-strong",
 	}
 
 	linuxLdflags = []string{
@@ -43,12 +45,14 @@
 		"-Wl,-z,relro",
 		"-Wl,-z,now",
 		"-Wl,--no-undefined-version",
+
+		"--gcc-toolchain=${LinuxGccRoot}",
+		"--sysroot ${LinuxGccRoot}/sysroot",
 	}
 
 	// Extended cflags
 	linuxX86Cflags = []string{
 		"-msse3",
-		"-mfpmath=sse",
 		"-m32",
 		"-march=prescott",
 		"-D_FILE_OFFSET_BITS=64",
@@ -61,40 +65,17 @@
 
 	linuxX86Ldflags = []string{
 		"-m32",
+		"-B${LinuxGccRoot}/lib/gcc/${LinuxGccTriple}/${LinuxGccVersion}/32",
+		"-L${LinuxGccRoot}/lib/gcc/${LinuxGccTriple}/${LinuxGccVersion}/32",
+		"-L${LinuxGccRoot}/${LinuxGccTriple}/lib32",
 	}
 
 	linuxX8664Ldflags = []string{
 		"-m64",
-	}
-
-	linuxClangCflags = append(ClangFilterUnknownCflags(linuxCflags), []string{
-		"--gcc-toolchain=${LinuxGccRoot}",
-		"--sysroot ${LinuxGccRoot}/sysroot",
-		"-fstack-protector-strong",
-	}...)
-
-	linuxClangLdflags = append(ClangFilterUnknownCflags(linuxLdflags), []string{
-		"--gcc-toolchain=${LinuxGccRoot}",
-		"--sysroot ${LinuxGccRoot}/sysroot",
-	}...)
-
-	linuxClangLldflags = ClangFilterUnknownLldflags(linuxClangLdflags)
-
-	linuxX86ClangLdflags = append(ClangFilterUnknownCflags(linuxX86Ldflags), []string{
-		"-B${LinuxGccRoot}/lib/gcc/${LinuxGccTriple}/${LinuxGccVersion}/32",
-		"-L${LinuxGccRoot}/lib/gcc/${LinuxGccTriple}/${LinuxGccVersion}/32",
-		"-L${LinuxGccRoot}/${LinuxGccTriple}/lib32",
-	}...)
-
-	linuxX86ClangLldflags = ClangFilterUnknownLldflags(linuxX86ClangLdflags)
-
-	linuxX8664ClangLdflags = append(ClangFilterUnknownCflags(linuxX8664Ldflags), []string{
 		"-B${LinuxGccRoot}/lib/gcc/${LinuxGccTriple}/${LinuxGccVersion}",
 		"-L${LinuxGccRoot}/lib/gcc/${LinuxGccTriple}/${LinuxGccVersion}",
 		"-L${LinuxGccRoot}/${LinuxGccTriple}/lib64",
-	}...)
-
-	linuxX8664ClangLldflags = ClangFilterUnknownLldflags(linuxX8664ClangLdflags)
+	}
 
 	linuxAvailableLibraries = addPrefix([]string{
 		"c",
@@ -130,18 +111,16 @@
 
 	pctx.StaticVariable("LinuxGccTriple", "x86_64-linux")
 
-	pctx.StaticVariable("LinuxClangCflags", strings.Join(linuxClangCflags, " "))
-	pctx.StaticVariable("LinuxClangLdflags", strings.Join(linuxClangLdflags, " "))
-	pctx.StaticVariable("LinuxClangLldflags", strings.Join(linuxClangLldflags, " "))
+	pctx.StaticVariable("LinuxCflags", strings.Join(linuxCflags, " "))
+	pctx.StaticVariable("LinuxLdflags", strings.Join(linuxLdflags, " "))
+	pctx.StaticVariable("LinuxLldflags", strings.Join(linuxLdflags, " "))
 
-	pctx.StaticVariable("LinuxX86ClangCflags",
-		strings.Join(ClangFilterUnknownCflags(linuxX86Cflags), " "))
-	pctx.StaticVariable("LinuxX8664ClangCflags",
-		strings.Join(ClangFilterUnknownCflags(linuxX8664Cflags), " "))
-	pctx.StaticVariable("LinuxX86ClangLdflags", strings.Join(linuxX86ClangLdflags, " "))
-	pctx.StaticVariable("LinuxX86ClangLldflags", strings.Join(linuxX86ClangLldflags, " "))
-	pctx.StaticVariable("LinuxX8664ClangLdflags", strings.Join(linuxX8664ClangLdflags, " "))
-	pctx.StaticVariable("LinuxX8664ClangLldflags", strings.Join(linuxX8664ClangLldflags, " "))
+	pctx.StaticVariable("LinuxX86Cflags", strings.Join(linuxX86Cflags, " "))
+	pctx.StaticVariable("LinuxX8664Cflags", strings.Join(linuxX8664Cflags, " "))
+	pctx.StaticVariable("LinuxX86Ldflags", strings.Join(linuxX86Ldflags, " "))
+	pctx.StaticVariable("LinuxX86Lldflags", strings.Join(linuxX86Ldflags, " "))
+	pctx.StaticVariable("LinuxX8664Ldflags", strings.Join(linuxX8664Ldflags, " "))
+	pctx.StaticVariable("LinuxX8664Lldflags", strings.Join(linuxX8664Ldflags, " "))
 	// Yasm flags
 	pctx.StaticVariable("LinuxX86YasmFlags", "-f elf32 -m x86")
 	pctx.StaticVariable("LinuxX8664YasmFlags", "-f elf64 -m amd64")
@@ -189,11 +168,11 @@
 	return "i686-linux-gnu"
 }
 
-func (t *toolchainLinuxX86) ClangCflags() string {
-	return "${config.LinuxClangCflags} ${config.LinuxX86ClangCflags}"
+func (t *toolchainLinuxX86) Cflags() string {
+	return "${config.LinuxCflags} ${config.LinuxX86Cflags}"
 }
 
-func (t *toolchainLinuxX86) ClangCppflags() string {
+func (t *toolchainLinuxX86) Cppflags() string {
 	return ""
 }
 
@@ -201,28 +180,28 @@
 	return "x86_64-linux-gnu"
 }
 
-func (t *toolchainLinuxX8664) ClangCflags() string {
-	return "${config.LinuxClangCflags} ${config.LinuxX8664ClangCflags}"
+func (t *toolchainLinuxX8664) Cflags() string {
+	return "${config.LinuxCflags} ${config.LinuxX8664Cflags}"
 }
 
-func (t *toolchainLinuxX8664) ClangCppflags() string {
+func (t *toolchainLinuxX8664) Cppflags() string {
 	return ""
 }
 
-func (t *toolchainLinuxX86) ClangLdflags() string {
-	return "${config.LinuxClangLdflags} ${config.LinuxX86ClangLdflags}"
+func (t *toolchainLinuxX86) Ldflags() string {
+	return "${config.LinuxLdflags} ${config.LinuxX86Ldflags}"
 }
 
-func (t *toolchainLinuxX86) ClangLldflags() string {
-	return "${config.LinuxClangLldflags} ${config.LinuxX86ClangLldflags}"
+func (t *toolchainLinuxX86) Lldflags() string {
+	return "${config.LinuxLldflags} ${config.LinuxX86Lldflags}"
 }
 
-func (t *toolchainLinuxX8664) ClangLdflags() string {
-	return "${config.LinuxClangLdflags} ${config.LinuxX8664ClangLdflags}"
+func (t *toolchainLinuxX8664) Ldflags() string {
+	return "${config.LinuxLdflags} ${config.LinuxX8664Ldflags}"
 }
 
-func (t *toolchainLinuxX8664) ClangLldflags() string {
-	return "${config.LinuxClangLldflags} ${config.LinuxX8664ClangLldflags}"
+func (t *toolchainLinuxX8664) Lldflags() string {
+	return "${config.LinuxLldflags} ${config.LinuxX8664Lldflags}"
 }
 
 func (t *toolchainLinuxX86) YasmFlags() string {
diff --git a/cc/config/x86_windows_host.go b/cc/config/x86_windows_host.go
index b77df79..d9a7537 100644
--- a/cc/config/x86_windows_host.go
+++ b/cc/config/x86_windows_host.go
@@ -44,32 +44,28 @@
 
 		"--sysroot ${WindowsGccRoot}/${WindowsGccTriple}",
 	}
-	windowsClangCflags = append(ClangFilterUnknownCflags(windowsCflags), []string{}...)
 
 	windowsIncludeFlags = []string{
 		"-isystem ${WindowsGccRoot}/${WindowsGccTriple}/include",
 	}
 
-	windowsClangCppflags = []string{}
+	windowsCppflags = []string{}
 
-	windowsX86ClangCppflags = []string{
+	windowsX86Cppflags = []string{
 		// Use SjLj exceptions for 32-bit.  libgcc_eh implements SjLj
 		// exception model for 32-bit.
 		"-fsjlj-exceptions",
 	}
 
-	windowsX8664ClangCppflags = []string{}
+	windowsX8664Cppflags = []string{}
 
 	windowsLdflags = []string{
-		"--enable-stdcall-fixup",
 		"-Wl,--dynamicbase",
 		"-Wl,--nxcompat",
 	}
-	windowsLldflags = []string{
+	windowsLldflags = append(windowsLdflags, []string{
 		"-Wl,--Xlink=-Brepro", // Enable deterministic build
-	}
-	windowsClangLdflags  = append(ClangFilterUnknownCflags(windowsLdflags), []string{}...)
-	windowsClangLldflags = append(ClangFilterUnknownLldflags(windowsClangLdflags), windowsLldflags...)
+	}...)
 
 	windowsX86Cflags = []string{
 		"-m32",
@@ -84,28 +80,24 @@
 		"-Wl,--large-address-aware",
 		"-L${WindowsGccRoot}/${WindowsGccTriple}/lib32",
 		"-static-libgcc",
-	}
-	windowsX86ClangLdflags = append(ClangFilterUnknownCflags(windowsX86Ldflags), []string{
+
 		"-B${WindowsGccRoot}/${WindowsGccTriple}/bin",
 		"-B${WindowsGccRoot}/lib/gcc/${WindowsGccTriple}/4.8.3/32",
 		"-L${WindowsGccRoot}/lib/gcc/${WindowsGccTriple}/4.8.3/32",
 		"-B${WindowsGccRoot}/${WindowsGccTriple}/lib32",
-	}...)
-	windowsX86ClangLldflags = ClangFilterUnknownLldflags(windowsX86ClangLdflags)
+	}
 
 	windowsX8664Ldflags = []string{
 		"-m64",
 		"-L${WindowsGccRoot}/${WindowsGccTriple}/lib64",
 		"-Wl,--high-entropy-va",
 		"-static-libgcc",
-	}
-	windowsX8664ClangLdflags = append(ClangFilterUnknownCflags(windowsX8664Ldflags), []string{
+
 		"-B${WindowsGccRoot}/${WindowsGccTriple}/bin",
 		"-B${WindowsGccRoot}/lib/gcc/${WindowsGccTriple}/4.8.3",
 		"-L${WindowsGccRoot}/lib/gcc/${WindowsGccTriple}/4.8.3",
 		"-B${WindowsGccRoot}/${WindowsGccTriple}/lib64",
-	}...)
-	windowsX8664ClangLldflags = ClangFilterUnknownLldflags(windowsX8664ClangLdflags)
+	}
 
 	windowsAvailableLibraries = addPrefix([]string{
 		"gdi32",
@@ -138,21 +130,19 @@
 
 	pctx.StaticVariable("WindowsGccTriple", "x86_64-w64-mingw32")
 
-	pctx.StaticVariable("WindowsClangCflags", strings.Join(windowsClangCflags, " "))
-	pctx.StaticVariable("WindowsClangLdflags", strings.Join(windowsClangLdflags, " "))
-	pctx.StaticVariable("WindowsClangLldflags", strings.Join(windowsClangLldflags, " "))
-	pctx.StaticVariable("WindowsClangCppflags", strings.Join(windowsClangCppflags, " "))
+	pctx.StaticVariable("WindowsCflags", strings.Join(windowsCflags, " "))
+	pctx.StaticVariable("WindowsLdflags", strings.Join(windowsLdflags, " "))
+	pctx.StaticVariable("WindowsLldflags", strings.Join(windowsLldflags, " "))
+	pctx.StaticVariable("WindowsCppflags", strings.Join(windowsCppflags, " "))
 
-	pctx.StaticVariable("WindowsX86ClangCflags",
-		strings.Join(ClangFilterUnknownCflags(windowsX86Cflags), " "))
-	pctx.StaticVariable("WindowsX8664ClangCflags",
-		strings.Join(ClangFilterUnknownCflags(windowsX8664Cflags), " "))
-	pctx.StaticVariable("WindowsX86ClangLdflags", strings.Join(windowsX86ClangLdflags, " "))
-	pctx.StaticVariable("WindowsX86ClangLldflags", strings.Join(windowsX86ClangLldflags, " "))
-	pctx.StaticVariable("WindowsX8664ClangLdflags", strings.Join(windowsX8664ClangLdflags, " "))
-	pctx.StaticVariable("WindowsX8664ClangLldflags", strings.Join(windowsX8664ClangLldflags, " "))
-	pctx.StaticVariable("WindowsX86ClangCppflags", strings.Join(windowsX86ClangCppflags, " "))
-	pctx.StaticVariable("WindowsX8664ClangCppflags", strings.Join(windowsX8664ClangCppflags, " "))
+	pctx.StaticVariable("WindowsX86Cflags", strings.Join(windowsX86Cflags, " "))
+	pctx.StaticVariable("WindowsX8664Cflags", strings.Join(windowsX8664Cflags, " "))
+	pctx.StaticVariable("WindowsX86Ldflags", strings.Join(windowsX86Ldflags, " "))
+	pctx.StaticVariable("WindowsX86Lldflags", strings.Join(windowsX86Ldflags, " "))
+	pctx.StaticVariable("WindowsX8664Ldflags", strings.Join(windowsX8664Ldflags, " "))
+	pctx.StaticVariable("WindowsX8664Lldflags", strings.Join(windowsX8664Ldflags, " "))
+	pctx.StaticVariable("WindowsX86Cppflags", strings.Join(windowsX86Cppflags, " "))
+	pctx.StaticVariable("WindowsX8664Cppflags", strings.Join(windowsX8664Cppflags, " "))
 
 	pctx.StaticVariable("WindowsIncludeFlags", strings.Join(windowsIncludeFlags, " "))
 	// Yasm flags
@@ -214,36 +204,36 @@
 	return "x86_64-pc-windows-gnu"
 }
 
-func (t *toolchainWindowsX86) ClangCflags() string {
-	return "${config.WindowsClangCflags} ${config.WindowsX86ClangCflags}"
+func (t *toolchainWindowsX86) Cflags() string {
+	return "${config.WindowsCflags} ${config.WindowsX86Cflags}"
 }
 
-func (t *toolchainWindowsX8664) ClangCflags() string {
-	return "${config.WindowsClangCflags} ${config.WindowsX8664ClangCflags}"
+func (t *toolchainWindowsX8664) Cflags() string {
+	return "${config.WindowsCflags} ${config.WindowsX8664Cflags}"
 }
 
-func (t *toolchainWindowsX86) ClangCppflags() string {
-	return "${config.WindowsClangCppflags} ${config.WindowsX86ClangCppflags}"
+func (t *toolchainWindowsX86) Cppflags() string {
+	return "${config.WindowsCppflags} ${config.WindowsX86Cppflags}"
 }
 
-func (t *toolchainWindowsX8664) ClangCppflags() string {
-	return "${config.WindowsClangCppflags} ${config.WindowsX8664ClangCppflags}"
+func (t *toolchainWindowsX8664) Cppflags() string {
+	return "${config.WindowsCppflags} ${config.WindowsX8664Cppflags}"
 }
 
-func (t *toolchainWindowsX86) ClangLdflags() string {
-	return "${config.WindowsClangLdflags} ${config.WindowsX86ClangLdflags}"
+func (t *toolchainWindowsX86) Ldflags() string {
+	return "${config.WindowsLdflags} ${config.WindowsX86Ldflags}"
 }
 
-func (t *toolchainWindowsX86) ClangLldflags() string {
-	return "${config.WindowsClangLldflags} ${config.WindowsX86ClangLldflags}"
+func (t *toolchainWindowsX86) Lldflags() string {
+	return "${config.WindowsLldflags} ${config.WindowsX86Lldflags}"
 }
 
-func (t *toolchainWindowsX8664) ClangLdflags() string {
-	return "${config.WindowsClangLdflags} ${config.WindowsX8664ClangLdflags}"
+func (t *toolchainWindowsX8664) Ldflags() string {
+	return "${config.WindowsLdflags} ${config.WindowsX8664Ldflags}"
 }
 
-func (t *toolchainWindowsX8664) ClangLldflags() string {
-	return "${config.WindowsClangLldflags} ${config.WindowsX8664ClangLldflags}"
+func (t *toolchainWindowsX8664) Lldflags() string {
+	return "${config.WindowsLldflags} ${config.WindowsX8664Lldflags}"
 }
 
 func (t *toolchainWindowsX86) YasmFlags() string {
diff --git a/cc/linker.go b/cc/linker.go
index 13df232..a712391 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -479,9 +479,9 @@
 	}
 
 	if linker.useClangLld(ctx) {
-		flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.ClangLldflags())
+		flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.Lldflags())
 	} else {
-		flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.ClangLdflags())
+		flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.Ldflags())
 	}
 
 	if !ctx.toolchain().Bionic() && !ctx.Fuchsia() {
@@ -535,7 +535,7 @@
 		flags.Global.LdFlags = append(flags.Global.LdFlags, "-Wl,--hash-style=both")
 	}
 
-	flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.ToolchainClangLdflags())
+	flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.ToolchainLdflags())
 
 	if Bool(linker.Properties.Group_static_libs) {
 		flags.GroupStaticLibs = true
diff --git a/cc/makevars.go b/cc/makevars.go
index 2b326ef..393170a 100644
--- a/cc/makevars.go
+++ b/cc/makevars.go
@@ -92,8 +92,8 @@
 	ctx.Strict("RS_LLVM_AS", "${config.RSLLVMPrebuiltsPath}/llvm-as")
 	ctx.Strict("RS_LLVM_LINK", "${config.RSLLVMPrebuiltsPath}/llvm-link")
 
-	ctx.Strict("CLANG_EXTERNAL_CFLAGS", "${config.ClangExternalCflags}")
-	ctx.Strict("GLOBAL_CLANG_CFLAGS_NO_OVERRIDE", "${config.NoOverrideClangGlobalCflags}")
+	ctx.Strict("CLANG_EXTERNAL_CFLAGS", "${config.ExternalCflags}")
+	ctx.Strict("GLOBAL_CLANG_CFLAGS_NO_OVERRIDE", "${config.NoOverrideGlobalCflags}")
 	ctx.Strict("GLOBAL_CLANG_CPPFLAGS_NO_OVERRIDE", "")
 
 	ctx.Strict("BOARD_VNDK_VERSION", ctx.DeviceConfig().VndkVersion())
@@ -212,13 +212,13 @@
 	ctx.StrictRaw(makePrefix+"C_SYSTEM_INCLUDES", strings.Join(systemIncludes, " "))
 
 	if target.Arch.ArchType == android.Arm {
-		flags, err := toolchain.ClangInstructionSetFlags("arm")
+		flags, err := toolchain.InstructionSetFlags("arm")
 		if err != nil {
 			panic(err)
 		}
 		ctx.Strict(makePrefix+"arm_CFLAGS", flags)
 
-		flags, err = toolchain.ClangInstructionSetFlags("thumb")
+		flags, err = toolchain.InstructionSetFlags("thumb")
 		if err != nil {
 			panic(err)
 		}
@@ -230,29 +230,29 @@
 
 	ctx.Strict(clangPrefix+"TRIPLE", toolchain.ClangTriple())
 	ctx.Strict(clangPrefix+"GLOBAL_CFLAGS", strings.Join([]string{
-		toolchain.ClangCflags(),
-		"${config.CommonClangGlobalCflags}",
-		fmt.Sprintf("${config.%sClangGlobalCflags}", hod),
-		toolchain.ToolchainClangCflags(),
+		toolchain.Cflags(),
+		"${config.CommonGlobalCflags}",
+		fmt.Sprintf("${config.%sGlobalCflags}", hod),
+		toolchain.ToolchainCflags(),
 		clangExtras,
 		productExtraCflags,
 	}, " "))
 	ctx.Strict(clangPrefix+"GLOBAL_CPPFLAGS", strings.Join([]string{
-		"${config.CommonClangGlobalCppflags}",
+		"${config.CommonGlobalCppflags}",
 		fmt.Sprintf("${config.%sGlobalCppflags}", hod),
-		toolchain.ClangCppflags(),
+		toolchain.Cppflags(),
 	}, " "))
 	ctx.Strict(clangPrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
 		fmt.Sprintf("${config.%sGlobalLdflags}", hod),
-		toolchain.ClangLdflags(),
-		toolchain.ToolchainClangLdflags(),
+		toolchain.Ldflags(),
+		toolchain.ToolchainLdflags(),
 		productExtraLdflags,
 		clangExtras,
 	}, " "))
 	ctx.Strict(clangPrefix+"GLOBAL_LLDFLAGS", strings.Join([]string{
 		fmt.Sprintf("${config.%sGlobalLldflags}", hod),
-		toolchain.ClangLldflags(),
-		toolchain.ToolchainClangLdflags(),
+		toolchain.Lldflags(),
+		toolchain.ToolchainLdflags(),
 		productExtraLdflags,
 		clangExtras,
 	}, " "))
diff --git a/cc/object.go b/cc/object.go
index 5ded0e9..0f983c8 100644
--- a/cc/object.go
+++ b/cc/object.go
@@ -231,7 +231,7 @@
 }
 
 func (object *objectLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
-	flags.Global.LdFlags = append(flags.Global.LdFlags, ctx.toolchain().ToolchainClangLdflags())
+	flags.Global.LdFlags = append(flags.Global.LdFlags, ctx.toolchain().ToolchainLdflags())
 
 	if lds := android.OptionalPathForModuleSrc(ctx, object.Properties.Linker_script); lds.Valid() {
 		flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-T,"+lds.String())
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 19c65ca..dff9543 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -154,12 +154,23 @@
 // PRODUCT_BOOT_JARS_EXTRA variables. The AOSP makefiles specify some common Framework libraries,
 // but more product-specific libraries can be added in the product makefiles.
 //
-// Each component of the PRODUCT_BOOT_JARS and PRODUCT_BOOT_JARS_EXTRA variables is either a simple
-// name (if the library is a part of the Platform), or a colon-separated pair <apex, name> (if the
-// library is a part of a non-updatable APEX).
+// Each component of the PRODUCT_BOOT_JARS and PRODUCT_BOOT_JARS_EXTRA variables is a
+// colon-separated pair <apex>:<library>, where <apex> is the variant name of a non-updatable APEX,
+// "platform" if the library is a part of the platform in the system partition, or "system_ext" if
+// it's in the system_ext partition.
+//
+// In these variables APEXes are identified by their "variant names", i.e. the names they get
+// mounted as in /apex on device. In Soong modules that is the name set in the "apex_name"
+// properties, which default to the "name" values. For example, many APEXes have both
+// com.android.xxx and com.google.android.xxx modules in Soong, but take the same place
+// /apex/com.android.xxx at runtime. In these cases the variant name is always com.android.xxx,
+// regardless which APEX goes into the product. See also android.ApexInfo.ApexVariationName and
+// apex.apexBundleProperties.Apex_name.
 //
 // A related variable PRODUCT_UPDATABLE_BOOT_JARS contains bootclasspath libraries that are in
-// updatable APEXes. They are not included in the boot image.
+// APEXes. They are not included in the boot image. The only exception here is core-icu4j.jar that
+// has been historically part of the boot image and is now in a non updatable apex; it is treated
+// as being part of PRODUCT_BOOT_JARS and is in the boot image.
 //
 // One exception to the above rules are "coverage" builds (a special build flavor which requires
 // setting environment variable EMMA_INSTRUMENT_FRAMEWORK=true). In coverage builds the Java code in
diff --git a/java/java.go b/java/java.go
index e74185e..bd059b5 100644
--- a/java/java.go
+++ b/java/java.go
@@ -580,6 +580,10 @@
 
 	JarToExport     android.Path `android:"arch_variant"`
 	AidlIncludeDirs android.Paths
+
+	// The list of permitted packages that need to be passed to the prebuilts as they are used to
+	// create the updatable-bcp-packages.txt file.
+	PermittedPackages []string
 }
 
 func (p *librarySdkMemberProperties) PopulateFromVariant(ctx android.SdkMemberContext, variant android.Module) {
@@ -588,6 +592,8 @@
 	p.JarToExport = ctx.MemberType().(*librarySdkMemberType).jarToExportGetter(ctx, j)
 
 	p.AidlIncludeDirs = j.AidlIncludeDirs()
+
+	p.PermittedPackages = j.PermittedPackagesForUpdatableBootJars()
 }
 
 func (p *librarySdkMemberProperties) AddToPropertySet(ctx android.SdkMemberContext, propertySet android.BpPropertySet) {
@@ -606,6 +612,10 @@
 		propertySet.AddProperty("jars", []string{snapshotRelativeJavaLibPath})
 	}
 
+	if len(p.PermittedPackages) > 0 {
+		propertySet.AddProperty("permitted_packages", p.PermittedPackages)
+	}
+
 	// Do not copy anything else to the snapshot.
 	if memberType.onlyCopyJarToSnapshot {
 		return
@@ -1126,6 +1136,10 @@
 
 	Installable *bool
 
+	// If not empty, classes are restricted to the specified packages and their sub-packages.
+	// This information is used to generate the updatable-bcp-packages.txt file.
+	Permitted_packages []string
+
 	// List of shared java libs that this module has dependencies to
 	Libs []string
 
@@ -1178,6 +1192,12 @@
 	minSdkVersion android.SdkSpec
 }
 
+var _ PermittedPackagesForUpdatableBootJars = (*Import)(nil)
+
+func (j *Import) PermittedPackagesForUpdatableBootJars() []string {
+	return j.properties.Permitted_packages
+}
+
 func (j *Import) SdkVersion(ctx android.EarlyModuleContext) android.SdkSpec {
 	return android.SdkSpecFrom(ctx, String(j.properties.Sdk_version))
 }
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 2b71857..d1b4a47 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -1897,6 +1897,10 @@
 
 	// If set to true, compile dex files for the stubs. Defaults to false.
 	Compile_dex *bool
+
+	// If not empty, classes are restricted to the specified packages and their sub-packages.
+	// This information is used to generate the updatable-bcp-packages.txt file.
+	Permitted_packages []string
 }
 
 type SdkLibraryImport struct {
@@ -1995,6 +1999,12 @@
 	return module
 }
 
+var _ PermittedPackagesForUpdatableBootJars = (*SdkLibraryImport)(nil)
+
+func (module *SdkLibraryImport) PermittedPackagesForUpdatableBootJars() []string {
+	return module.properties.Permitted_packages
+}
+
 func (module *SdkLibraryImport) Prebuilt() *android.Prebuilt {
 	return &module.prebuilt
 }
@@ -2510,6 +2520,8 @@
 
 	// The paths to the doctag files to add to the prebuilt.
 	Doctag_paths android.Paths
+
+	Permitted_packages []string
 }
 
 type scopeProperties struct {
@@ -2550,6 +2562,7 @@
 	s.Shared_library = proptools.BoolPtr(sdk.sharedLibrary())
 	s.Compile_dex = sdk.dexProperties.Compile_dex
 	s.Doctag_paths = sdk.doctagPaths
+	s.Permitted_packages = sdk.PermittedPackagesForUpdatableBootJars()
 }
 
 func (s *sdkLibrarySdkMemberProperties) AddToPropertySet(ctx android.SdkMemberContext, propertySet android.BpPropertySet) {
@@ -2562,6 +2575,9 @@
 	if s.Compile_dex != nil {
 		propertySet.AddProperty("compile_dex", *s.Compile_dex)
 	}
+	if len(s.Permitted_packages) > 0 {
+		propertySet.AddProperty("permitted_packages", s.Permitted_packages)
+	}
 
 	for _, apiScope := range allApiScopes {
 		if properties, ok := s.Scopes[apiScope]; ok {
diff --git a/rust/bindgen.go b/rust/bindgen.go
index f9e6cd0..3470e51 100644
--- a/rust/bindgen.go
+++ b/rust/bindgen.go
@@ -137,15 +137,15 @@
 	implicits = append(implicits, deps.depGeneratedHeaders...)
 
 	// Default clang flags
-	cflags = append(cflags, "${cc_config.CommonClangGlobalCflags}")
+	cflags = append(cflags, "${cc_config.CommonGlobalCflags}")
 	if ctx.Device() {
-		cflags = append(cflags, "${cc_config.DeviceClangGlobalCflags}")
+		cflags = append(cflags, "${cc_config.DeviceGlobalCflags}")
 	}
 
 	// Toolchain clang flags
 	cflags = append(cflags, "-target "+ccToolchain.ClangTriple())
-	cflags = append(cflags, strings.ReplaceAll(ccToolchain.ClangCflags(), "${config.", "${cc_config."))
-	cflags = append(cflags, strings.ReplaceAll(ccToolchain.ToolchainClangCflags(), "${config.", "${cc_config."))
+	cflags = append(cflags, strings.ReplaceAll(ccToolchain.Cflags(), "${config.", "${cc_config."))
+	cflags = append(cflags, strings.ReplaceAll(ccToolchain.ToolchainCflags(), "${config.", "${cc_config."))
 
 	// Dependency clang flags and include paths
 	cflags = append(cflags, deps.depClangFlags...)
diff --git a/rust/config/x86_darwin_host.go b/rust/config/x86_darwin_host.go
index ddd93e8..8ff0dd4 100644
--- a/rust/config/x86_darwin_host.go
+++ b/rust/config/x86_darwin_host.go
@@ -78,7 +78,7 @@
 
 func (t *toolchainDarwinX8664) ToolchainLinkFlags() string {
 	// Prepend the lld flags from cc_config so we stay in sync with cc
-	return "${cc_config.DarwinClangLldflags} ${config.DarwinToolchainLinkFlags} ${config.DarwinToolchainX8664LinkFlags}"
+	return "${cc_config.DarwinLldflags} ${config.DarwinToolchainLinkFlags} ${config.DarwinToolchainX8664LinkFlags}"
 }
 
 func (t *toolchainDarwinX8664) ToolchainRustFlags() string {
diff --git a/rust/config/x86_device.go b/rust/config/x86_device.go
index aae1125..5ae30e7 100644
--- a/rust/config/x86_device.go
+++ b/rust/config/x86_device.go
@@ -65,7 +65,7 @@
 
 func (t *toolchainX86) ToolchainLinkFlags() string {
 	// Prepend the lld flags from cc_config so we stay in sync with cc
-	return "${config.DeviceGlobalLinkFlags} ${cc_config.X86ClangLldflags} ${config.X86ToolchainLinkFlags}"
+	return "${config.DeviceGlobalLinkFlags} ${cc_config.X86Lldflags} ${config.X86ToolchainLinkFlags}"
 }
 
 func (t *toolchainX86) ToolchainRustFlags() string {
diff --git a/rust/config/x86_linux_host.go b/rust/config/x86_linux_host.go
index b63e14d..a9fdaed 100644
--- a/rust/config/x86_linux_host.go
+++ b/rust/config/x86_linux_host.go
@@ -79,7 +79,7 @@
 
 func (t *toolchainLinuxX8664) ToolchainLinkFlags() string {
 	// Prepend the lld flags from cc_config so we stay in sync with cc
-	return "${cc_config.LinuxClangLldflags} ${cc_config.LinuxX8664ClangLldflags} " +
+	return "${cc_config.LinuxLldflags} ${cc_config.LinuxX8664Lldflags} " +
 		"${config.LinuxToolchainLinkFlags} ${config.LinuxToolchainX8664LinkFlags}"
 }
 
@@ -117,7 +117,7 @@
 
 func (t *toolchainLinuxX86) ToolchainLinkFlags() string {
 	// Prepend the lld flags from cc_config so we stay in sync with cc
-	return "${cc_config.LinuxClangLldflags} ${cc_config.LinuxX86ClangLldflags} " +
+	return "${cc_config.LinuxLldflags} ${cc_config.LinuxX86Lldflags} " +
 		"${config.LinuxToolchainLinkFlags} ${config.LinuxToolchainX86LinkFlags}"
 }
 
diff --git a/sdk/bootclasspath_fragment_sdk_test.go b/sdk/bootclasspath_fragment_sdk_test.go
index a458cba..1d2ab42 100644
--- a/sdk/bootclasspath_fragment_sdk_test.go
+++ b/sdk/bootclasspath_fragment_sdk_test.go
@@ -327,6 +327,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["myapex"],
     jars: ["java/mybootlib.jar"],
+    permitted_packages: ["mybootlib"],
 }
 
 java_sdk_library_import {
@@ -336,6 +337,7 @@
     apex_available: ["myapex"],
     shared_library: true,
     compile_dex: true,
+    permitted_packages: ["myothersdklibrary"],
     public: {
         jars: ["sdk_library/public/myothersdklibrary-stubs.jar"],
         stub_srcs: ["sdk_library/public/myothersdklibrary_stub_sources"],
@@ -409,6 +411,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["myapex"],
     jars: ["java/mybootlib.jar"],
+    permitted_packages: ["mybootlib"],
 }
 
 java_sdk_library_import {
@@ -418,6 +421,7 @@
     apex_available: ["myapex"],
     shared_library: true,
     compile_dex: true,
+    permitted_packages: ["myothersdklibrary"],
     public: {
         jars: ["sdk_library/public/myothersdklibrary-stubs.jar"],
         stub_srcs: ["sdk_library/public/myothersdklibrary_stub_sources"],
@@ -509,6 +513,12 @@
 				out/soong/.intermediates/frameworks/base/boot/platform-bootclasspath/android_common/hiddenapi-monolithic/index-from-classes.csv
         snapshot/hiddenapi/index.csv
 			`, rule)
+
+			// Make sure that the permitted packages from the prebuilts end up in the
+			// updatable-bcp-packages.txt file.
+			rule = module.Output("updatable-bcp-packages.txt")
+			expectedContents := `'mybootlib\nmyothersdklibrary\n'`
+			android.AssertStringEquals(t, "updatable-bcp-packages.txt", expectedContents, rule.Args["content"])
 		}),
 		snapshotTestPreparer(checkSnapshotWithSourcePreferred, preparerForSnapshot),
 		snapshotTestPreparer(checkSnapshotPreferredWithSource, preparerForSnapshot),
@@ -779,6 +789,7 @@
 				srcs: ["Test.java"],
 				compile_dex: true,
 				public: {enabled: true},
+				permitted_packages: ["mysdklibrary"],
 			}
 		`),
 	).RunTest(t)
@@ -822,6 +833,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["myapex"],
     jars: ["java/mybootlib.jar"],
+    permitted_packages: ["mybootlib"],
 }
 
 java_sdk_library_import {
@@ -831,6 +843,7 @@
     apex_available: ["//apex_available:platform"],
     shared_library: true,
     compile_dex: true,
+    permitted_packages: ["mysdklibrary"],
     public: {
         jars: ["sdk_library/public/mysdklibrary-stubs.jar"],
         stub_srcs: ["sdk_library/public/mysdklibrary_stub_sources"],
diff --git a/sdk/java_sdk_test.go b/sdk/java_sdk_test.go
index a2cfe6d..813dcfd 100644
--- a/sdk/java_sdk_test.go
+++ b/sdk/java_sdk_test.go
@@ -175,6 +175,7 @@
 			sdk_version: "none",
 			compile_dex: true,
 			host_supported: true,
+			permitted_packages: ["pkg.myjavalib"],
 		}
 	`)
 
@@ -188,6 +189,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 `),
 		checkVersionedAndroidBpContents(`
@@ -199,6 +201,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 
 sdk_snapshot {
@@ -437,6 +440,7 @@
 			system_modules: "none",
 			sdk_version: "none",
 			compile_dex: true,
+			permitted_packages: ["pkg.myjavalib"],
 		}
 	`)
 
@@ -450,6 +454,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 `),
 		checkVersionedAndroidBpContents(`
@@ -461,6 +466,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 
 module_exports_snapshot {
@@ -1045,6 +1051,7 @@
 			shared_library: false,
 			stubs_library_visibility: ["//other"],
 			stubs_source_visibility: ["//another"],
+			permitted_packages: ["pkg.myjavalib"],
 		}
 	`)
 
@@ -1058,6 +1065,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:anyapex"],
     shared_library: false,
+    permitted_packages: ["pkg.myjavalib"],
     public: {
         jars: ["sdk_library/public/myjavalib-stubs.jar"],
         stub_srcs: ["sdk_library/public/myjavalib_stub_sources"],
@@ -1090,6 +1098,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:anyapex"],
     shared_library: false,
+    permitted_packages: ["pkg.myjavalib"],
     public: {
         jars: ["sdk_library/public/myjavalib-stubs.jar"],
         stub_srcs: ["sdk_library/public/myjavalib_stub_sources"],
diff --git a/ui/build/config.go b/ui/build/config.go
index 7370627..cd6d549 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -345,12 +345,7 @@
 		return
 	}
 
-	b := &smpb.BuildConfig{
-		ForceUseGoma: proto.Bool(config.ForceUseGoma()),
-		UseGoma:      proto.Bool(config.UseGoma()),
-		UseRbe:       proto.Bool(config.UseRBE()),
-	}
-	ctx.Metrics.BuildConfig(b)
+	ctx.Metrics.BuildConfig(buildConfig(config))
 
 	s := &smpb.SystemResourceInfo{
 		TotalPhysicalMemory: proto.Uint64(config.TotalRAM()),
@@ -359,6 +354,16 @@
 	ctx.Metrics.SystemResourceInfo(s)
 }
 
+func buildConfig(config Config) *smpb.BuildConfig {
+	return &smpb.BuildConfig{
+		ForceUseGoma:    proto.Bool(config.ForceUseGoma()),
+		UseGoma:         proto.Bool(config.UseGoma()),
+		UseRbe:          proto.Bool(config.UseRBE()),
+		BazelAsNinja:    proto.Bool(config.UseBazel()),
+		BazelMixedBuild: proto.Bool(config.bazelBuildMode() == mixedBuild),
+	}
+}
+
 // getConfigArgs processes the command arguments based on the build action and creates a set of new
 // arguments to be accepted by Config.
 func getConfigArgs(action BuildAction, dir string, ctx Context, args []string) []string {
diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index 7b14c47..7d4c76b 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -26,7 +26,10 @@
 	"testing"
 
 	"android/soong/ui/logger"
+	smpb "android/soong/ui/metrics/metrics_proto"
 	"android/soong/ui/status"
+
+	"github.com/golang/protobuf/proto"
 )
 
 func testContext() Context {
@@ -995,3 +998,111 @@
 		})
 	}
 }
+
+func TestBuildConfig(t *testing.T) {
+	tests := []struct {
+		name                string
+		environ             Environment
+		useBazel            bool
+		expectedBuildConfig *smpb.BuildConfig
+	}{
+		{
+			name:    "none set",
+			environ: Environment{},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "force use goma",
+			environ: Environment{"FORCE_USE_GOMA=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(true),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "use goma",
+			environ: Environment{"USE_GOMA=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(true),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "use rbe",
+			environ: Environment{"USE_RBE=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(true),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:     "use bazel as ninja",
+			environ:  Environment{},
+			useBazel: true,
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(true),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "bazel mixed build",
+			environ: Environment{"USE_BAZEL_ANALYSIS=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(true),
+			},
+		},
+		{
+			name: "all set",
+			environ: Environment{
+				"FORCE_USE_GOMA=1",
+				"USE_GOMA=1",
+				"USE_RBE=1",
+				"USE_BAZEL_ANALYSIS=1",
+			},
+			useBazel: true,
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(true),
+				UseGoma:         proto.Bool(true),
+				UseRbe:          proto.Bool(true),
+				BazelAsNinja:    proto.Bool(true),
+				BazelMixedBuild: proto.Bool(true),
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			c := &configImpl{
+				environ:  &tc.environ,
+				useBazel: tc.useBazel,
+			}
+			config := Config{c}
+			actualBuildConfig := buildConfig(config)
+			if expected := tc.expectedBuildConfig; !proto.Equal(expected, actualBuildConfig) {
+				t.Errorf("Expected build config != actual build config: %#v != %#v", *expected, *actualBuildConfig)
+			}
+		})
+	}
+}
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index fc2cfa4..1063337 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -433,9 +433,14 @@
 }
 
 type BuildConfig struct {
-	UseGoma              *bool    `protobuf:"varint,1,opt,name=use_goma,json=useGoma" json:"use_goma,omitempty"`
-	UseRbe               *bool    `protobuf:"varint,2,opt,name=use_rbe,json=useRbe" json:"use_rbe,omitempty"`
-	ForceUseGoma         *bool    `protobuf:"varint,3,opt,name=force_use_goma,json=forceUseGoma" json:"force_use_goma,omitempty"`
+	UseGoma      *bool `protobuf:"varint,1,opt,name=use_goma,json=useGoma" json:"use_goma,omitempty"`
+	UseRbe       *bool `protobuf:"varint,2,opt,name=use_rbe,json=useRbe" json:"use_rbe,omitempty"`
+	ForceUseGoma *bool `protobuf:"varint,3,opt,name=force_use_goma,json=forceUseGoma" json:"force_use_goma,omitempty"`
+	// Whether the Bazel is acting as the Ninja executor for this build.
+	BazelAsNinja *bool `protobuf:"varint,4,opt,name=bazel_as_ninja,json=bazelAsNinja" json:"bazel_as_ninja,omitempty"`
+	// Whether build is occurring in a mixed build mode, where Bazel maintains the
+	// definition and build of some modules in cooperation with Soong.
+	BazelMixedBuild      *bool    `protobuf:"varint,5,opt,name=bazel_mixed_build,json=bazelMixedBuild" json:"bazel_mixed_build,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -487,6 +492,20 @@
 	return false
 }
 
+func (m *BuildConfig) GetBazelAsNinja() bool {
+	if m != nil && m.BazelAsNinja != nil {
+		return *m.BazelAsNinja
+	}
+	return false
+}
+
+func (m *BuildConfig) GetBazelMixedBuild() bool {
+	if m != nil && m.BazelMixedBuild != nil {
+		return *m.BazelMixedBuild
+	}
+	return false
+}
+
 type SystemResourceInfo struct {
 	// The total physical memory in bytes.
 	TotalPhysicalMemory *uint64 `protobuf:"varint,1,opt,name=total_physical_memory,json=totalPhysicalMemory" json:"total_physical_memory,omitempty"`
@@ -990,92 +1009,94 @@
 }
 
 var fileDescriptor_6039342a2ba47b72 = []byte{
-	// 1380 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x57, 0xef, 0x52, 0x1b, 0x37,
-	0x10, 0x8f, 0xc1, 0x60, 0x7b, 0xfd, 0x07, 0x23, 0xa0, 0x5c, 0x48, 0xd2, 0x52, 0xb7, 0x49, 0x99,
-	0x4e, 0x43, 0x32, 0x34, 0xc3, 0x64, 0x98, 0x4c, 0xa7, 0xe0, 0xd0, 0x34, 0x65, 0xc0, 0x8c, 0x08,
-	0x69, 0xda, 0x7e, 0x50, 0xe5, 0xb3, 0x0c, 0x97, 0xdc, 0x9d, 0x6e, 0x24, 0x1d, 0xc5, 0x79, 0xb3,
-	0x7e, 0xee, 0x4b, 0xf4, 0x05, 0xfa, 0x04, 0x7d, 0x81, 0x8e, 0x56, 0x77, 0xe6, 0x20, 0x6e, 0xc2,
-	0xe4, 0xdb, 0xe9, 0xb7, 0xbf, 0xdf, 0x6a, 0xb5, 0xd2, 0xee, 0xda, 0xd0, 0x8c, 0x84, 0x51, 0x81,
-	0xaf, 0xd7, 0x13, 0x25, 0x8d, 0x24, 0x0b, 0x5a, 0xca, 0xf8, 0x84, 0xf5, 0xd3, 0x20, 0x1c, 0xb0,
-	0xcc, 0xd4, 0xf9, 0xbb, 0x01, 0xf5, 0x7d, 0xf7, 0xbd, 0xc3, 0xb5, 0x20, 0x0f, 0x61, 0xd1, 0x11,
-	0x06, 0xdc, 0x08, 0x66, 0x82, 0x48, 0x68, 0xc3, 0xa3, 0xc4, 0x2b, 0xad, 0x96, 0xd6, 0xa6, 0x29,
-	0x41, 0xdb, 0x53, 0x6e, 0xc4, 0x8b, 0xdc, 0x42, 0x6e, 0x42, 0xd5, 0x29, 0x82, 0x81, 0x37, 0xb5,
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+	0xf6, 0x83, 0xe0, 0x89, 0xe5, 0xec, 0x2c, 0xfd, 0x92, 0x7d, 0x45, 0x64, 0x79, 0x33, 0xfc, 0x97,
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 }
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index 91d8dd9..b284bf9 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -116,6 +116,13 @@
   optional bool use_rbe = 2;
 
   optional bool force_use_goma = 3;
+
+  // Whether the Bazel is acting as the Ninja executor for this build.
+  optional bool bazel_as_ninja = 4;
+
+  // Whether build is occurring in a mixed build mode, where Bazel maintains the
+  // definition and build of some modules in cooperation with Soong.
+  optional bool bazel_mixed_build = 5;
 }
 
 message SystemResourceInfo {