GN: Makes GN output deterministic

tools/gn/command_refs.cc

 // Copyright (c) 2013 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.
 
 #include <map>
 #include <set>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_split.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/deps_iterator.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/input_file.h"
 #include "tools/gn/item.h"
+#include "tools/gn/pointer_set.h"
 #include "tools/gn/setup.h"
 #include "tools/gn/standard_out.h"
 #include "tools/gn/target.h"
 
 namespace commands {
 
 namespace {
 
-typedef std::set<const Target*> TargetSet;
+typedef PointerSet<const Target> TargetSet;
 typedef std::vector<const Target*> TargetVector;
 
 // Maps targets to the list of targets that depend on them.
 typedef std::multimap<const Target*, const Target*> DepMap;
 
 // Populates the reverse dependency map for the targets in the Setup.
 void FillDepMap(Setup* setup, DepMap* dep_map) {
   for (const auto& target : setup->builder()->GetAllResolvedTargets()) {
     for (const auto& dep_pair : target->GetDeps(Target::DEPS_ALL))
       dep_map->insert(std::make_pair(dep_pair.ptr, target));
@@ skipping 445 matching lines @@
 
   // If you ask for the references of a valid target, but that target has
   // nothing referencing it, we'll get here without having printed anything.
   if (!quiet && cnt == 0)
     OutputString("Nothing references this.\n", DECORATION_YELLOW);
 
   return 0;
 }
 
 }  // namespace commands