diff --git a/cc/config/tidy.go b/cc/config/tidy.go
new file mode 100644
index 0000000..dd39421
--- /dev/null
+++ b/cc/config/tidy.go
@@ -0,0 +1,106 @@
+// Copyright 2016 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"strings"
+)
+
+func init() {
+	// Most Android source files are not clang-tidy clean yet.
+	// Global tidy checks include only google*, performance*,
+	// and misc-macro-parentheses, but not google-readability*
+	// or google-runtime-references.
+	pctx.StaticVariable("TidyDefaultGlobalChecks", strings.Join([]string{
+		"-*",
+		"google*",
+		"misc-macro-parentheses",
+		"performance*",
+		"-google-readability*",
+		"-google-runtime-references",
+	}, ","))
+
+	// There are too many clang-tidy warnings in external and vendor projects.
+	// Enable only some google checks for these projects.
+	pctx.StaticVariable("TidyExternalVendorChecks", strings.Join([]string{
+		"-*",
+		"google*",
+		"-google-build-using-namespace",
+		"-google-default-arguments",
+		"-google-explicit-constructor",
+		"-google-readability*",
+		"-google-runtime-int",
+		"-google-runtime-references",
+	}, ","))
+
+	// Give warnings to header files only in selected directories.
+	// Do not give warnings to external or vendor header files, which contain too
+	// many warnings.
+	pctx.StaticVariable("TidyDefaultHeaderDirs", strings.Join([]string{
+		"art/",
+		"bionic/",
+		"bootable/",
+		"build/",
+		"cts/",
+		"dalvik/",
+		"developers/",
+		"development/",
+		"frameworks/",
+		"libcore/",
+		"libnativehelper/",
+		"system/",
+	}, "|"))
+}
+
+type PathBasedTidyCheck struct {
+	PathPrefix string
+	Checks     string
+}
+
+const tidyDefault = "${config.TidyDefaultGlobalChecks}"
+const tidyExternalVendor = "${config.TidyExternalVendorChecks}"
+
+// This is a map of local path prefixes to the set of default clang-tidy checks
+// to be used.
+// The last matched local_path_prefix should be the most specific to be used.
+var DefaultLocalTidyChecks = []PathBasedTidyCheck{
+	{"external/", tidyExternalVendor},
+	{"external/google", tidyDefault},
+	{"external/webrtc", tidyDefault},
+	{"frameworks/compile/mclinker/", tidyExternalVendor},
+	{"hardware/qcom", tidyExternalVendor},
+	{"vendor/", tidyExternalVendor},
+	{"vendor/google", tidyDefault},
+	{"vendor/google_devices", tidyExternalVendor},
+}
+
+var reversedDefaultLocalTidyChecks = reverseTidyChecks(DefaultLocalTidyChecks)
+
+func reverseTidyChecks(in []PathBasedTidyCheck) []PathBasedTidyCheck {
+	ret := make([]PathBasedTidyCheck, len(in))
+	for i, check := range in {
+		ret[len(in)-i-1] = check
+	}
+	return ret
+}
+
+func TidyChecksForDir(dir string) string {
+	for _, pathCheck := range reversedDefaultLocalTidyChecks {
+		if strings.HasPrefix(dir, pathCheck.PathPrefix) {
+			return pathCheck.Checks
+		}
+	}
+	return tidyDefault
+}