Index: boost/lexical_cast.hpp
===================================================================
--- boost/lexical_cast.hpp	(revision 84183)
+++ boost/lexical_cast.hpp	(revision 85160)
@@ -69,9 +69,4 @@
     throw_exception(bad_lexical_cast(typeid(Source), typeid(Target)))
 #endif
-
-#if (defined(BOOST_LCAST_HAS_INT128) && !defined(__GNUC__)) || GCC_VERSION > 40700
-#define BOOST_LCAST_HAS_INT128
-#endif
-
 
 namespace boost
@@ -317,5 +312,5 @@
 #endif
 
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
         template <> struct stream_char_common< boost::int128_type >: public boost::mpl::identity< char > {};
         template <> struct stream_char_common< boost::uint128_type >: public boost::mpl::identity< char > {};
@@ -614,5 +609,5 @@
         BOOST_LCAST_DEF(         __int64)
 #endif
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
         BOOST_LCAST_DEF(boost::int128_type)
         BOOST_LCAST_DEF(boost::uint128_type)
@@ -880,4 +875,13 @@
 #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
             BOOST_STATIC_ASSERT(!std::numeric_limits<T>::is_signed);
+
+            // GCC when used with flag -std=c++0x may not have std::numeric_limits
+            // specializations for __int128 and unsigned __int128 types.
+            // Try compilation with -std=gnu++0x or -std=gnu++11.
+            //
+            // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40856
+            BOOST_STATIC_ASSERT_MSG(std::numeric_limits<T>::is_specialized,
+                "std::numeric_limits are not specialized for integral type passed to boost::lexical_cast"
+            );
 #endif
             CharT const czero = lcast_char_constants<CharT>::zero;
@@ -1828,5 +1832,5 @@
 #endif
 
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
         bool operator<<(const boost::uint128_type& n)   { start = lcast_put_unsigned<Traits>(n, finish); return true; }
         bool operator<<(const boost::int128_type& n)    { return shl_signed(n); }
@@ -2040,5 +2044,5 @@
 #endif
 
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
             bool operator>>(boost::uint128_type& output)        { return shr_unsigned(output); }
             bool operator>>(boost::int128_type& output)         { return shr_signed(output); }
@@ -2554,5 +2558,5 @@
     }
 #endif
-#ifndef BOOST_NO_CHAR16_T
+#ifndef BOOST_NO_CXX11_CHAR16_T
     template <typename Target>
     inline Target lexical_cast(const char16_t* chars, std::size_t count)
@@ -2563,5 +2567,5 @@
     }
 #endif
-#ifndef BOOST_NO_CHAR32_T
+#ifndef BOOST_NO_CXX11_CHAR32_T
     template <typename Target>
     inline Target lexical_cast(const char32_t* chars, std::size_t count)
@@ -2720,5 +2724,4 @@
 #undef BOOST_LCAST_THROW_BAD_CAST
 #undef BOOST_LCAST_NO_WCHAR_T
-#undef BOOST_LCAST_HAS_INT128
 
 #endif // BOOST_LEXICAL_CAST_INCLUDED
Index: libs/conversion/test/lexical_cast_integral_types_test.cpp
===================================================================
--- libs/conversion/test/lexical_cast_integral_types_test.cpp	(revision 83764)
+++ libs/conversion/test/lexical_cast_integral_types_test.cpp	(revision 85160)
@@ -49,8 +49,4 @@
 #endif
 
-#if (defined(BOOST_LCAST_HAS_INT128) && !defined(__GNUC__)) || GCC_VERSION > 40700
-#define BOOST_LCAST_HAS_INT128
-#endif
-
 // Test all 65536 values if true:
 bool const lcast_test_small_integral_types_completely = false;
@@ -76,5 +72,5 @@
 void test_conversion_from_to_ulonglong();
 #endif
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
 void test_conversion_from_to_int128();
 void test_conversion_from_to_uint128();
@@ -100,5 +96,5 @@
     suite->add(BOOST_TEST_CASE(&test_conversion_from_to_ulonglong));
 #endif
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
     suite->add(BOOST_TEST_CASE(&test_conversion_from_to_int128));
     suite->add(BOOST_TEST_CASE(&test_conversion_from_to_uint128));
@@ -445,6 +441,6 @@
 
     // Overflow test case from David W. Birdsall
-    std::string must_owerflow_str = "160000000000000000000";
-    std::string must_owerflow_negative_str = "-160000000000000000000";
+    std::string must_owerflow_str =             (sizeof(T) < 16 ?  "160000000000000000000" :  "1600000000000000000000000000000000000000");
+    std::string must_owerflow_negative_str =    (sizeof(T) < 16 ? "-160000000000000000000" : "-1600000000000000000000000000000000000000");
     for (int i = 0; i < 15; ++i) {
         BOOST_CHECK_THROW(lexical_cast<T>(must_owerflow_str), bad_lexical_cast);
@@ -558,13 +554,32 @@
 
 
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
+
+template <bool Specialized, class T>
+struct test_if_specialized {
+    static void test() {}
+};
+
+template <class T>
+struct test_if_specialized<true, T> {
+    static void test() {
+        test_conversion_from_to_integral_minimal<T>();
+    }
+};
+
 void test_conversion_from_to_int128()
 {
-    test_conversion_from_to_integral_minimal<boost::int128_type>();
+    test_if_specialized<
+        std::numeric_limits<boost::int128_type>::is_specialized, 
+        boost::int128_type
+    >::test();
 }
 
 void test_conversion_from_to_uint128()
 {
-    test_conversion_from_to_integral_minimal<boost::uint128_type>();
+    test_if_specialized<
+        std::numeric_limits<boost::int128_type>::is_specialized, 
+        boost::uint128_type
+    >::test();
 }
 #endif
@@ -603,5 +618,5 @@
 #endif
 
-#ifdef BOOST_LCAST_HAS_INT128
+#ifdef BOOST_HAS_INT128
     test_integral_conversions_on_min_max_impl<boost::int128_type>();
 #endif
Index: libs/conversion/test/Jamfile.v2
===================================================================
--- libs/conversion/test/Jamfile.v2	(revision 83689)
+++ libs/conversion/test/Jamfile.v2	(revision 85160)
@@ -1,4 +1,4 @@
 # Copyright (C) 2001-2003 Douglas Gregor
-# Copyright (C) 2011-2012 Antony Polukhin
+# Copyright (C) 2011-2013 Antony Polukhin
 #
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -16,4 +16,9 @@
         <toolset>gcc-4.6:<cxxflags>-ftrapv
         <toolset>clang:<cxxflags>-ftrapv
+        # default to all warnings on:
+        <warnings>all
+        # set warnings as errors for those compilers we know we get warning free:
+        <toolset>gcc:<cxxflags>-Wextra
+        <toolset>gcc:<cxxflags>-Wno-uninitialized
     ;
 
Index: libs/conversion/test/implicit_cast_fail.cpp
===================================================================
--- libs/conversion/test/implicit_cast_fail.cpp	(revision 79364)
+++ libs/conversion/test/implicit_cast_fail.cpp	(revision 85160)
@@ -20,5 +20,7 @@
 {
     foo x = implicit_cast<foo>("foobar");
-    (void)x;  // warning suppression.
+    (void)x;            // warning suppression.
+    BOOST_CHECK(false); // suppressing warning about 'boost::unit_test::{anonymous}::unit_test_log' defined but not used
     return 0;
 }
+
Index: libs/conversion/test/lexical_cast_to_pointer_test.cpp
===================================================================
--- libs/conversion/test/lexical_cast_to_pointer_test.cpp	(revision 83689)
+++ libs/conversion/test/lexical_cast_to_pointer_test.cpp	(revision 85160)
@@ -18,4 +18,6 @@
 {
     boost::lexical_cast<char*>("Hello");
+    BOOST_CHECK(false); // suppressing warning about 'boost::unit_test::{anonymous}::unit_test_log' defined but not used
     return 0;
 }
+
Index: libs/conversion/index.html
===================================================================
--- libs/conversion/index.html	(revision 73851)
+++ libs/conversion/index.html	(revision 85160)
@@ -7,4 +7,11 @@
 <meta name="ProgId" content="FrontPage.Editor.Document">
 <title>Boost Conversion Library</title>
+<style>
+   .copyright
+    {
+        color: #666666;
+        font-size: small;
+    }
+</style>
 </head>
 
@@ -33,5 +40,9 @@
 S-Format="%d %B, %Y" startspan -->June 23, 2005<!--webbot bot="Timestamp" endspan i-checksum="30348" -->
 </p>
-
+<p class="copyright">
+    Copyright 2001 Beman Dawes.
+    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)
+</p>
 </body>
 
Index: libs/conversion/numeric_cast_test.cpp
===================================================================
--- libs/conversion/numeric_cast_test.cpp	(revision 80409)
+++ libs/conversion/numeric_cast_test.cpp	(revision 85160)
@@ -49,5 +49,5 @@
     signed char c = 0;
 
-    c = large_value;  // see if compiler generates warning
+    c = static_cast<signed char>(large_value);
 
     c = numeric_cast<signed char>( small_value );