experiment with -Wimplicit-fallthrough

net/base/registry_controlled_domains/registry_controlled_domain.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // NB: Modelled after Mozilla's code (originally written by Pamela Greene,
 // later modified by others), but almost entirely rewritten for Chrome.
 //   (netwerk/dns/src/nsEffectiveTLDService.cpp)
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
@@ skipping 35 matching lines @@
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/net_module.h"
 #include "net/base/net_util.h"
 #include "url/gurl.h"
 #include "url/url_parse.h"
 
+// gperf intentionally uses fallthroughs.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wimplicit-fallthrough"
 #include "effective_tld_names.cc"
+#pragma clang diagnostic pop
 
 namespace net {
 namespace registry_controlled_domains {
 
 namespace {
 
 const int kExceptionRule = 1;
 const int kWildcardRule = 2;
 const int kPrivateRule = 4;
 
@@ skipping 198 matching lines @@
 }
 
 void SetFindDomainFunctionAndStringPoolForTesting(FindDomainPtr function,
                                                   const char* stringpool) {
   g_find_domain_function = function ? function : kDefaultFindDomainFunction;
   g_stringpool = stringpool ? stringpool : kDefaultStringPool;
 }
 
 }  // namespace registry_controlled_domains
 }  // namespace net