Added an option (-i) to have dump_syms output header information only.

src/common/mac/dump_syms.h

 // -*- mode: c++ -*-
 
 // Copyright (c) 2011, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
@@ skipping 94 matching lines @@
     if (object_files_.size() > 0)
       return &object_files_[0];
     return NULL;
   }
 
   // Read the selected object file's debugging information, and write it out to
   // |stream|. Return true on success; if an error occurs, report it and
   // return false.
   bool WriteSymbolFile(std::ostream &stream);
 
+  // Read the selected object file's debugging information, and write out the
+  // header only to |stream|. Return true on success; if an error occurs, report
+  // it and return false.
+  bool WriteSymbolFileHeader(std::ostream &stream);
+
   // As above, but simply return the debugging information in module
   // instead of writing it to a stream. The caller owns the resulting
   // module object and must delete it when finished.
   bool ReadSymbolData(Module** module);
 
  private:
   // Used internally.
   class DumperLineToModule;
   class LoadCommandDumper;
 
   // This method behaves similarly to NXFindBestFatArch, but it supports
   // SuperFatArch.
   SuperFatArch* FindBestMatchForArchitecture(
       cpu_type_t cpu_type, cpu_subtype_t cpu_subtype);
 
   // Return an identifier string for the file this DumpSymbols is dumping.
   std::string Identifier();
 
+
+  // Creates an empty module object.
+  bool CreateEmptyModule(scoped_ptr<Module>& module);
+
   // Read debugging information from |dwarf_sections|, which was taken from
   // |macho_reader|, and add it to |module|. On success, return true;
   // on failure, report the problem and return false.
   bool ReadDwarf(google_breakpad::Module *module,
                  const mach_o::Reader &macho_reader,
                  const mach_o::SectionMap &dwarf_sections,
                  bool handle_inter_cu_refs) const;
 
   // Read DWARF CFI or .eh_frame data from |section|, belonging to
   // |macho_reader|, and record it in |module|.  If |eh_frame| is true,
@@ skipping 35 matching lines @@
   const SuperFatArch *selected_object_file_;
 
   // A string that identifies the selected object file, for use in error
   // messages.  This is usually object_filename_, but if that refers to a
   // fat binary, it includes an indication of the particular architecture
   // within that binary.
   string selected_object_name_;
 };
 
 }  // namespace google_breakpad