* cref.cc: New file.

* cref.h: New file.
	* options.h (class General_options): Add --print-symbol-counts.
	* main.cc (main): Issue defined symbol report if requested.
	* archive.cc (Archive::interpret_header): Make into a const member
	function.
	(Archive::add_symbols): Call Input_objects::archive_start and
	archive_stop.
	(Archive::const_iterator): Define new class.
	(Archive::begin, Archive::end): New functions.
	(Archive::include_all_members): Rewrite to use iterator.
	(Archive::count_members): New function.
	* archive.h (class Archive): Update declarations.
	(Archive::filename): New function.
	* object.cc: Include "cref.h".
	(Sized_relobj::Sized_relobj): Initialize defined_count_.
	(Sized_relobj::do_get_global_symbol_counts): New function.
	(Input_objects::add_object): Add object to cross-referencer.
	(Input_objects::archive_start): New function.
	(Input_objects::archive_stop): New function.
	(Input_objects::print_symbol_counts): New function.
	* object.h: Declare Cref and Archive.
	(Object::get_global_symbol_counts): New function.
	(Object::do_get_global_symbol_counts): New pure virtual function.
	(class Sized_relobj): Add defined_count_ field.  Update
	declarations.
	(class Input_objects): Add cref_ field.  Update constructor.
	Update declarations.
	* dynobj.cc (Sized_dynobj::Sized_dynobj): Initialize symbols_ and
	defined_count_.
	(Sized_dynobj::do_add_symbols): Allocate symbols_ if printing
	symbol counts.
	(Sized_dynobj::do_get_global_symbol_counts): New function.
	* dynobj.h (class Sized_dynobj): Add fields symbols_ and
	defined_count_.  Update declarations.  Define Symbols typedef.
	* symtab.cc (Symbol_table::add_from_relobj): Add defined
	parameter.  Change all callers.
	(Symbol_table::add_from_dynobj): Add sympointers and defined
	parameters.  Change all callers.
	* symtab.h (class Symbol_table): Update declarations.
	* Makefile.am (CCFILES): Add cref.cc.
	(HFILES): Add cref.h.
	* Makefile.in: Rebuild.

gold/object.h

@@ -36,6 +36,8 @@ namespace gold
 
 class General_options;
 class Task;
+class Cref;
+class Archive;
 class Layout;
 class Output_section;
 class Output_file;
@@ -421,6 +423,14 @@ class Object
   clear_view_cache_marks()
   { this->input_file()->file().clear_view_cache_marks(); }
 
+  // Get the number of global symbols defined by this object, and the
+  // number of the symbols whose final definition came from this
+  // object.
+  void
+  get_global_symbol_counts(const Symbol_table* symtab, size_t* defined,
+			   size_t* used) const
+  { this->do_get_global_symbol_counts(symtab, defined, used); }
+
  protected:
   // Read the symbols--implemented by child class.
   virtual void
@@ -476,6 +486,10 @@ class Object
   virtual Xindex*
   do_initialize_xindex() = 0;
 
+  // Implement get_global_symbol_counts--implemented by child class.
+  virtual void
+  do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0;
+
   // Get the file.  We pass on const-ness.
   Input_file*
   input_file()
@@ -1395,6 +1409,10 @@ class Sized_relobj : public Relobj
   Xindex*
   do_initialize_xindex();
 
+  // Get symbol counts.
+  void
+  do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
+
   // Get the offset of a section.
   uint64_t
   do_output_section_offset(unsigned int shndx) const
@@ -1628,6 +1646,8 @@ class Sized_relobj : public Relobj
   unsigned int output_local_dynsym_count_;
   // The entries in the symbol table for the external symbols.
   Symbols symbols_;
+  // Number of symbols defined in object file itself.
+  size_t defined_count_;
   // File offset for local symbols.
   off_t local_symbol_offset_;
   // File offset for local dynamic symbols.
@@ -1655,7 +1675,8 @@ class Input_objects
 {
  public:
   Input_objects()
-    : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_()
+    : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_(),
+      cref_(NULL)
   { }
 
   // The type of the list of input relocateable objects.
@@ -1671,6 +1692,14 @@ class Input_objects
   bool
   add_object(Object*);
 
+  // Start processing an archive.
+  void
+  archive_start(Archive*);
+
+  // Stop processing an archive.
+  void
+  archive_stop(Archive*);
+
   // For each dynamic object, check whether we've seen all of its
   // explicit dependencies.
   void
@@ -1681,6 +1710,10 @@ class Input_objects
   bool
   found_in_system_library_directory(const Object*) const;
 
+  // Print symbol counts.
+  void
+  print_symbol_counts(const Symbol_table*) const;
+
   // Iterate over all regular objects.
 
   Relobj_iterator
@@ -1723,6 +1756,8 @@ class Input_objects
   Unordered_set<std::string> sonames_;
   // The directory in which we find the libc.so.
   std::string system_library_directory_;
+  // Manage cross-references if requested.
+  Cref* cref_;
 };
 
 // Some of the information we pass to the relocation routines.  We