Add support for module-definition files to gn

tools/gn/ninja_binary_target_writer.h

 // 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.
 
 #ifndef TOOLS_GN_NINJA_BINARY_TARGET_WRITER_H_
 #define TOOLS_GN_NINJA_BINARY_TARGET_WRITER_H_
 
 #include "base/macros.h"
 #include "tools/gn/config_values.h"
 #include "tools/gn/ninja_target_writer.h"
 #include "tools/gn/toolchain.h"
 #include "tools/gn/unique_vector.h"
 
 struct EscapeOptions;
 
 // Writes a .ninja file for a binary target type (an executable, a shared
 // library, or a static library).
 class NinjaBinaryTargetWriter : public NinjaTargetWriter {
  public:
   NinjaBinaryTargetWriter(const Target* target, std::ostream& out);
   ~NinjaBinaryTargetWriter() override;
 
   void Run() override;
 
  private:
   typedef std::set<OutputFile> OutputFileSet;
 
   void WriteCompilerVars();
-  void WriteSources(std::vector<OutputFile>* object_files);
-  void WriteLinkerStuff(const std::vector<OutputFile>& object_files);
-  void WriteLinkerFlags();
+  void WriteSources(std::vector<OutputFile>* object_files,
+                    std::vector<SourceFile>* other_files);
+  void WriteLinkerStuff(const std::vector<OutputFile>& object_files,
+                        const std::vector<SourceFile>& other_files);
+  void WriteLinkerFlags(const SourceFile* def_file);

[brettw, 2015/05/27 17:27:00]

Maybe call this variable optional_def_file so it's more clear that it can be
null?

   void WriteLibs();
   void WriteOutputExtension();
   void WriteSolibs(const std::vector<OutputFile>& solibs);
 
   // Writes the stamp line for a source set. These are not linked.
   void WriteSourceSetStamp(const std::vector<OutputFile>& object_files);
 
   // Gets all target dependencies and classifies them, as well as accumulates
   // object files from source sets we need to link.
   void GetDeps(UniqueVector<OutputFile>* extra_object_files,
@@ skipping 34 matching lines @@
                                Toolchain::ToolType* computed_tool_type,
                                std::vector<OutputFile>* outputs) const;
 
   const Tool* tool_;
 
   DISALLOW_COPY_AND_ASSIGN(NinjaBinaryTargetWriter);
 };
 
 #endif  // TOOLS_GN_NINJA_BINARY_TARGET_WRITER_H_