Require build directories exist for some GN commands.

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 "tools/gn/commands.h"
 #include "tools/gn/filesystem_utils.h"
@@ skipping 212 matching lines @@
   }
 
   const CommandLine* cmdline = CommandLine::ForCurrentProcess();
   bool tree = cmdline->HasSwitch("tree");
   bool all = cmdline->HasSwitch("all");
   bool all_toolchains = cmdline->HasSwitch("all-toolchains");
   bool files = cmdline->HasSwitch("files");
 
   Setup* setup = new Setup;
   setup->set_check_for_bad_items(false);
-  if (!setup->DoSetup(args[0]) || !setup->Run())
+  if (!setup->DoSetup(args[0], false) || !setup->Run())
     return 1;
 
   // Figure out the target or targets that the user is querying.
   std::vector<const Target*> query;
   if (!ResolveTargetsFromCommandLinePattern(setup, args[1], all_toolchains,
                                             &query))
     return 1;
   if (query.empty()) {
     OutputString("\"" + args[1] + "\" matches no targets.\n");
     return 0;
@@ skipping 39 matching lines @@
            cur_dep != dep_end; cur_dep++)
         results.insert(cur_dep->second);
     }
     OutputResultSet(results, files);
   }
 
   return 0;
 }
 
 }  // namespace commands