Index: boost/program_options/cmdline.hpp
===================================================================
--- boost/program_options/cmdline.hpp	(revision 57720)
+++ boost/program_options/cmdline.hpp	(working copy)
@@ -26,7 +26,7 @@
     enum style_t {
         /// Allow "--long_name" style
         allow_long = 1,
-        /// Alow "-<single character" style
+        /// Allow "-<single character" style
         allow_short = allow_long << 1,
         /// Allow "-" in short options
         allow_dash_for_short = allow_short << 1,
Index: boost/program_options/errors.hpp
===================================================================
--- boost/program_options/errors.hpp	(revision 57720)
+++ boost/program_options/errors.hpp	(working copy)
@@ -21,6 +21,7 @@
     class BOOST_PROGRAM_OPTIONS_DECL error : public std::logic_error {
     public:
         error(const std::string& what) : std::logic_error(what) {}
+
     };
 
     class BOOST_PROGRAM_OPTIONS_DECL invalid_syntax : public error {
@@ -42,8 +43,20 @@
     class BOOST_PROGRAM_OPTIONS_DECL unknown_option : public error {
     public:
         unknown_option(const std::string& name)
-        : error(std::string("unknown option ").append(name)) 
+        : error(std::string("unknown option ").append(name)), 
+          m_option_name(name)
         {}
+
+        // gcc says that throw specification on dtor is loosened
+        // without this line
+        ~unknown_option() throw() {}
+        
+        const std::string& get_option_name() const throw()
+        { 
+           return m_option_name; 
+        }
+    private:
+       std::string m_option_name;
     };
 
     /** Class thrown when there's ambiguity amoung several possible options. */
@@ -65,7 +78,19 @@
         user called a method which cannot return them all. */
     class BOOST_PROGRAM_OPTIONS_DECL multiple_values : public error {
     public:
-        multiple_values(const std::string& what) : error(what) {}
+        multiple_values(const std::string& what) 
+         : error(what), m_option_name() {}
+        ~multiple_values() throw() {}
+        
+        void set_option_name(const std::string& option);
+        
+        const std::string& get_option_name() const throw()
+        {
+           return m_option_name;
+        }
+    private:
+        std::string m_option_name; // The name of the option which
+                                   // caused the exception.        
     };
 
     /** Class thrown when there are several occurrences of an
@@ -73,7 +98,20 @@
         them all. */
     class BOOST_PROGRAM_OPTIONS_DECL multiple_occurrences : public error {
     public:
-        multiple_occurrences(const std::string& what) : error(what) {}
+        multiple_occurrences(const std::string& what) 
+         : error(what), m_option_name() {}
+        ~multiple_occurrences() throw() {}
+        
+        void set_option_name(const std::string& option);
+        
+        const std::string& get_option_name() const throw()
+        {
+           return m_option_name;
+        }
+
+    private:        
+        std::string m_option_name; // The name of the option which
+                                   // caused the exception.
     };
 
     /** Class thrown when value of option is incorrect. */
@@ -82,7 +120,12 @@
         validation_error(const std::string& what) : error(what) {}
         ~validation_error() throw() {}
         void set_option_name(const std::string& option);
-
+        
+        const std::string& get_option_name() const throw()
+        {
+           return m_option_name;
+        }
+        
         const char* what() const throw();
     private:
         mutable std::string m_message; // For on-demand formatting in 'what'
Index: libs/program_options/test/Jamfile.v2
===================================================================
--- libs/program_options/test/Jamfile.v2	(revision 57720)
+++ libs/program_options/test/Jamfile.v2	(working copy)
@@ -27,6 +27,7 @@
     [ po-test positional_options_test.cpp ]
     [ po-test unicode_test.cpp ] 
     [ po-test winmain.cpp ] 
+    [ po-test exception_test.cpp ]
     ;
         
 exe test_convert : test_convert.cpp ;   
Index: libs/program_options/test/exception_test.cpp
===================================================================
--- libs/program_options/test/exception_test.cpp	(revision 0)
+++ libs/program_options/test/exception_test.cpp	(revision 0)
@@ -0,0 +1,127 @@
+// Copyright Sascha Ochsenknecht 2009.
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+
+#include <boost/program_options/parsers.hpp>
+#include <boost/program_options/options_description.hpp>
+#include <boost/program_options/variables_map.hpp>
+#include <boost/program_options/cmdline.hpp>
+using namespace boost::program_options;
+
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <cassert>
+using namespace std;
+
+#include "minitest.hpp"
+
+
+
+void test_unknown_option() 
+{
+   options_description desc;
+   desc.add_options()
+        ("cfgfile,c", value<string>(), "the configfile")
+      ;
+
+   const char* cmdline[] = {"program", "-c", "file", "-f", "anotherfile"};
+   
+   variables_map vm;
+   try {
+      store(parse_command_line(sizeof(cmdline)/sizeof(const char*), 
+                                    const_cast<char**>(cmdline), desc), vm);
+   }
+   catch (unknown_option& e)
+   {
+      BOOST_CHECK_EQUAL(e.get_option_name(), "-f");      
+      BOOST_CHECK_EQUAL(string(e.what()), "unknown option -f");
+   }
+}
+
+
+
+void test_multiple_values() 
+{
+   options_description desc;
+   desc.add_options()
+        ("cfgfile,c", value<string>()->multitoken(), "the config file")
+        ("output,o", value<string>(), "the output file")
+      ;
+
+   const char* cmdline[] = { "program", "-o", "fritz", "hugo", "--cfgfile", "file", "c", "-o", "text.out" };
+   
+   variables_map vm;
+   try {
+      store(parse_command_line(sizeof(cmdline)/sizeof(const char*), 
+                                    const_cast<char**>(cmdline), desc), vm);
+      notify(vm);
+   }
+   catch (validation_error& e)
+   {
+      // TODO: this is currently validation_error, shouldn't it be multiple_values ???
+      // 
+      //   multiple_values is thrown only at one place untyped_value::xparse(),
+      //    but I think this can never be reached
+      //   because: untyped_value always has one value and this is filtered before reach specific
+      //   validation and parsing
+      //
+      BOOST_CHECK_EQUAL(e.get_option_name(), "cfgfile");      
+      BOOST_CHECK_EQUAL(string(e.what()), "in option 'cfgfile': multiple values not allowed");
+   }
+}
+
+
+void test_multiple_occurrences()
+{
+   options_description desc;
+   desc.add_options()
+        ("cfgfile,c", value<string>(), "the configfile")
+      ;
+
+   const char* cmdline[] = {"program", "--cfgfile", "file", "-c", "anotherfile"};
+   
+   variables_map vm;
+   try {
+      store(parse_command_line(sizeof(cmdline)/sizeof(const char*), 
+                                    const_cast<char**>(cmdline), desc), vm);
+      notify(vm);
+   }
+   catch (multiple_occurrences& e)
+   {
+      BOOST_CHECK_EQUAL(e.get_option_name(), "cfgfile");      
+      BOOST_CHECK_EQUAL(string(e.what()), "multiple_occurrences");
+   }
+}
+
+
+
+
+int main(int /*ac*/, char** /*av*/)
+{
+   test_unknown_option();
+   test_multiple_values();
+   test_multiple_occurrences();
+
+   bool helpflag = false;
+
+   options_description desc;
+   desc.add_options()
+        ("cfgfile,c", value<string>(), "the configfile")
+        ("help,h", value<bool>(&helpflag)->implicit_value(true), "help")
+      ;
+
+   const char* cmdline[] = {"program", "--cfgfile", "hugo", "-h", "yes"  };
+   
+   variables_map vm;
+      store(parse_command_line(sizeof(cmdline)/sizeof(const char*), 
+                                    const_cast<char**>(cmdline), desc), vm);
+      notify(vm);
+
+   cout << " help: " << (helpflag ? "true" : "false") << endl;
+
+
+   return 0;
+}
Index: libs/program_options/src/value_semantic.cpp
===================================================================
--- libs/program_options/src/value_semantic.cpp	(revision 57720)
+++ libs/program_options/src/value_semantic.cpp	(working copy)
@@ -223,7 +223,20 @@
 #endif                       
 
 
+    void multiple_values::set_option_name(const std::string& option_name)
+    {
+        m_option_name = option_name;
+    }
 
+
+
+    void multiple_occurrences::set_option_name(const std::string& option_name)
+    {
+        m_option_name = option_name;
+    }
+
+
+
     void validation_error::set_option_name(const std::string& option_name)
     {
         m_option_name = option_name;
Index: libs/program_options/src/variables_map.cpp
===================================================================
--- libs/program_options/src/variables_map.cpp	(revision 57720)
+++ libs/program_options/src/variables_map.cpp	(working copy)
@@ -80,6 +80,16 @@
                 e.set_option_name(name);
                 throw;
             }
+            catch(multiple_occurrences& e)
+            {
+                e.set_option_name(name);
+                throw;
+            }
+            catch(multiple_values& e) 
+            {
+                e.set_option_name(name);
+                throw;
+            }
 #endif
             v.m_value_semantic = d.semantic();