* options.h (Command_line::Pre_options): New class.

(Command_line::pre_options): New member.
	* options.cc (gold::options::ready_to_register): New variable.
	(One_option::register_option): Do nothing if not registering options.
	Assert if same short option registered twice.
	(General_options::General_options): Turn off option registration when
	done constructing.
	(Command_line::Pre_options::Pre_options): New constructor.

gold/ChangeLog

@@ -1,3 +1,14 @@
+2009-08-24  Cary Coutant  <ccoutant@google.com>
+
+	* options.h (Command_line::Pre_options): New class.
+	(Command_line::pre_options): New member.
+	* options.cc (gold::options::ready_to_register): New variable.
+	(One_option::register_option): Do nothing if not registering options.
+	Assert if same short option registered twice.
+	(General_options::General_options): Turn off option registration when
+	done constructing.
+	(Command_line::Pre_options::Pre_options): New constructor.
+
 2009-08-24  Cary Coutant  <ccoutant@google.com>
 
 	* options.h (General_options::no_keep_memory): Remove incorrect

gold/options.cc

@@ -47,6 +47,11 @@ Position_dependent_options::default_options_;
 namespace options
 {
 
+// This flag is TRUE if we should register the command-line options as they
+// are constructed.  It is set after contruction of the options within
+// class Position_dependent_options.
+static bool ready_to_register = false;
+
 // This global variable is set up as General_options is constructed.
 static std::vector<const One_option*> registered_options;
 
@@ -60,6 +65,9 @@ static One_option* short_options[128];
 void
 One_option::register_option()
 {
+  if (!ready_to_register)
+    return;
+
   registered_options.push_back(this);
 
   // We can't make long_options a static Option_map because we can't
@@ -75,7 +83,10 @@ One_option::register_option()
   const int shortname_as_int = static_cast<int>(this->shortname);
   gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
   if (this->shortname != '\0')
-    short_options[shortname_as_int] = this;
+    {
+      gold_assert(short_options[shortname_as_int] == NULL);
+      short_options[shortname_as_int] = this;
+    }
 }
 
 void
@@ -714,6 +725,8 @@ General_options::General_options()
     do_demangle_(false), plugins_(),
     incremental_disposition_(INCREMENTAL_CHECK), implicit_incremental_(false)
 {
+  // Turn off option registration once construction is complete.
+  gold::options::ready_to_register = false;
 }
 
 General_options::Object_format
@@ -1039,6 +1052,13 @@ Command_line::Command_line()
 {
 }
 
+// Pre_options is the hook that sets the ready_to_register flag.
+
+Command_line::Pre_options::Pre_options()
+{
+  gold::options::ready_to_register = true;
+}
+
 // Process the command line options.  For process_one_option, i is the
 // index of argv to process next, and must be an option (that is,
 // start with a dash).  The return value is the index of the next

gold/options.h

@@ -1479,6 +1479,16 @@ class Command_line
   Command_line(const Command_line&);
   Command_line& operator=(const Command_line&);
 
+  // This is a dummy class to provide a constructor that runs before
+  // the constructor for the General_options.  The Pre_options constructor
+  // is used as a hook to set the flag enabling the options to register
+  // themselves.
+  struct Pre_options {
+    Pre_options();
+  };
+
+  // This must come before options_!
+  Pre_options pre_options_;
   General_options options_;
   Position_dependent_options position_options_;
   Script_options script_options_;