Change default DEFAULT_TIDY_HEADER_DIRS to empty

* Default -header-filter will now contain only module directory.
  * In a clean build of aosp_x86_64-eng, this change can reduce
    the number of (duplicated) clang-tidy warnings by 77% or more.
* When compiled with WITH_TIDY=1, if DEFAULT_TIDY_HEADER_DIRS is
  not set, warnings from a header file will be shown only if
  the file is in a module's (sub)directory.
* Set DEFAULT_TIDY_HEADER_DIRS="bionic/|bootable/|build/|cts/|\
  dalvik/|developers/|development/|frameworks/|\
  libcore/|libnativehelper/|system/"
  will get before this change's -header-filter.
* Fix a bug: Default header-filter was not added when
  tidy_flags was defined in a module.
  With this fix, some incorrectly hidden header file tidy warnings
  will now show up.

Bug: 179530304
Test: make with WITH_TIDY=1 and various setting of DEFAULT_TIDY_HEADER_DIRS
Change-Id: Ia0c05349908a730862dae36be9a2dbe4f44fb6da
diff --git a/cc/tidy.go b/cc/tidy.go
index 972ad7b..251c67b 100644
--- a/cc/tidy.go
+++ b/cc/tidy.go
@@ -20,6 +20,7 @@
 
 	"github.com/google/blueprint/proptools"
 
+	"android/soong/android"
 	"android/soong/cc/config"
 )
 
@@ -75,9 +76,17 @@
 	}
 	esc := proptools.NinjaAndShellEscapeList
 	flags.TidyFlags = append(flags.TidyFlags, esc(tidy.Properties.Tidy_flags)...)
-	// If TidyFlags is empty, add default header filter.
-	if len(flags.TidyFlags) == 0 {
-		headerFilter := "-header-filter=\"(" + ctx.ModuleDir() + "|${config.TidyDefaultHeaderDirs})\""
+	// If TidyFlags does not contain -header-filter, add default header filter.
+	// Find the substring because the flag could also appear as --header-filter=...
+	// and with or without single or double quotes.
+	if !android.SubstringInList(flags.TidyFlags, "-header-filter=") {
+		defaultDirs := ctx.Config().Getenv("DEFAULT_TIDY_HEADER_DIRS")
+		headerFilter := "-header-filter="
+		if defaultDirs == "" {
+			headerFilter += ctx.ModuleDir() + "/"
+		} else {
+			headerFilter += "\"(" + ctx.ModuleDir() + "/|" + defaultDirs + ")\""
+		}
 		flags.TidyFlags = append(flags.TidyFlags, headerFilter)
 	}