Support for source_target_relative expansion in GN

tools/gn/ninja_action_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_action_target_writer.h"
 
 #include <stddef.h>
 
 #include "base/strings/string_util.h"
 #include "tools/gn/deps_iterator.h"
@@ skipping 166 matching lines @@
     // Response files require a unique name be defined.
     if (target_->action_values().uses_rsp_file())
       out_ << "  unique_name = " << i << std::endl;
 
     // The required types is the union of the args and response file. This
     // might theoretically duplicate a definition if the same substitution is
     // used in both the args and the reponse file. However, this should be
     // very unusual (normally the substitutions will go in one place or the
     // other) and the redundant assignment won't bother Ninja.
     SubstitutionWriter::WriteNinjaVariablesForSource(
-        settings_, sources[i],
+        target_, settings_, sources[i],
         target_->action_values().args().required_types(),
         args_escape_options, out_);
     SubstitutionWriter::WriteNinjaVariablesForSource(
-        settings_, sources[i],
+        target_, settings_, sources[i],
         target_->action_values().rsp_file_contents().required_types(),
         args_escape_options, out_);
 
     if (target_->action_values().has_depfile()) {
       out_ << "  depfile = ";
       WriteDepfile(sources[i]);
       out_ << std::endl;
     }
   }
 }
 
 void NinjaActionTargetWriter::WriteOutputFilesForBuildLine(
     const SourceFile& source,
     std::vector<OutputFile>* output_files) {
   size_t first_output_index = output_files->size();
 
   SubstitutionWriter::ApplyListToSourceAsOutputFile(
-      settings_, target_->action_values().outputs(), source, output_files);
+      target_, settings_, target_->action_values().outputs(), source,
+      output_files);
 
   for (size_t i = first_output_index; i < output_files->size(); i++) {
     out_ << " ";
     path_output_.WriteFile(out_, (*output_files)[i]);
   }
 }
 
 void NinjaActionTargetWriter::WriteDepfile(const SourceFile& source) {
   path_output_.WriteFile(out_,
       SubstitutionWriter::ApplyPatternToSourceAsOutputFile(
-          settings_, target_->action_values().depfile(), source));
+          target_, settings_, target_->action_values().depfile(), source));
 }