Add arflags to GN

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 767 matching lines @@
 
   // End of the link "build" line.
   out_ << std::endl;
 
   // The remaining things go in the inner scope of the link line.
   if (target_->output_type() == Target::EXECUTABLE ||
       target_->output_type() == Target::SHARED_LIBRARY ||
       target_->output_type() == Target::LOADABLE_MODULE) {
     WriteLinkerFlags(optional_def_file);
     WriteLibs();
+  } else if (target_->output_type() == Target::STATIC_LIBRARY) {
+    out_ << "  arflags =";
+    RecursiveTargetConfigStringsToStream(target_, &ConfigValues::arflags,
+                                         GetFlagOptions(), out_);
+    out_ << std::endl;
   }
   WriteOutputSubstitutions();
   WriteSolibs(solibs);
 }
 
 void NinjaBinaryTargetWriter::WriteLinkerFlags(
     const SourceFile* optional_def_file) {
   out_ << "  ldflags =";
 
   // First the ldflags from the target and its config.
-  EscapeOptions flag_options = GetFlagOptions();
   RecursiveTargetConfigStringsToStream(target_, &ConfigValues::ldflags,
-                                       flag_options, out_);
+                                       GetFlagOptions(), out_);
 
   // Followed by library search paths that have been recursively pushed
   // through the dependency tree.
   const OrderedSet<SourceDir> all_lib_dirs = target_->all_lib_dirs();
   if (!all_lib_dirs.empty()) {
     // Since we're passing these on the command line to the linker and not
     // to Ninja, we need to do shell escaping.
     PathOutput lib_path_output(path_output_.current_dir(),
                                settings_->build_settings()->root_path_utf8(),
                                ESCAPE_NINJA_COMMAND);
@@ skipping 191 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;
 }