"up-to-date" should only use hyphens when used as compound modifier of a noun

tools/gn/ninja_binary_target_writer.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 "tools/gn/ninja_binary_target_writer.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include <cstring>
@@ skipping 253 matching lines @@
 
 void NinjaBinaryTargetWriter::Run() {
   // Figure out what source types are needed.
   SourceFileTypeSet used_types;
   for (const auto& source : target_->sources())
     used_types.Set(GetSourceFileType(source));
 
   WriteCompilerVars(used_types);
 
   // The input dependencies will be an order-only dependency. This will cause
-  // Ninja to make sure the inputs are up-to-date before compiling this source,
+  // Ninja to make sure the inputs are up to date before compiling this source,
   // but changes in the inputs deps won't cause the file to be recompiled.
   //
   // This is important to prevent changes in unrelated actions that are
   // upstream of this target from causing everything to be recompiled.
   //
   // Why can we get away with this rather than using implicit deps ("|", which
   // will force rebuilds when the inputs change)? For source code, the
   // computed dependencies of all headers will be computed by the compiler,
   // which will cause source rebuilds if any "real" upstream dependencies
   // change.
@@ skipping 730 matching lines @@
           "\n"
           "In the latter case, either rename one of the files or move one of\n"
           "the sources to a separate source_set to avoid them both being in\n"
           "the same target.");
       g_scheduler->FailWithError(err);
       return false;
     }
   }
   return true;
 }