diff --git a/doc/html/boost_config/boost_macro_reference.html b/doc/html/boost_config/boost_macro_reference.html
index 5c39fd61..3240ba59 100644
--- a/doc/html/boost_config/boost_macro_reference.html
+++ b/doc/html/boost_config/boost_macro_reference.html
@@ -93,7 +93,7 @@
               </td>
 <td>
                 <p>
-                  The compiler exibits certain partial specialisation bug - probably
+                  The compiler exhibits certain partial specialisation bug - probably
                   Borland C++ Builder specific.
                 </p>
               </td>
@@ -1832,6 +1832,9 @@
 <td>
                 <p>
                   The library has a TR1 conforming version of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">array</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_ARRAY.
                 </p>
               </td>
 </tr>
@@ -1884,7 +1887,9 @@
               </td>
 <td>
                 <p>
-                  The library has TR1 conforming reference wrappers in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>.
+                  The library has TR1 conforming reference wrappers in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>. This macro is only guaranteed
+                  to be defined after including one of the headers from Boost.TR1.
+                  Further this macro is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
                 </p>
               </td>
 </tr>
@@ -1901,7 +1906,9 @@
               </td>
 <td>
                 <p>
-                  The library has a TR1 conforming result_of template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>.
+                  The library has a TR1 conforming result_of template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>. This macro is only guaranteed
+                  to be defined after including one of the headers from Boost.TR1.
+                  Further this macro is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
                 </p>
               </td>
 </tr>
@@ -1918,7 +1925,9 @@
               </td>
 <td>
                 <p>
-                  The library has a TR1 conforming mem_fn function template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>.
+                  The library has a TR1 conforming mem_fn function template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>. This macro is only guaranteed
+                  to be defined after including one of the headers from Boost.TR1.
+                  Further this macro is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
                 </p>
               </td>
 </tr>
@@ -1935,7 +1944,9 @@
               </td>
 <td>
                 <p>
-                  The library has a TR1 conforming bind function template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>.
+                  The library has a TR1 conforming bind function template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>. This macro is only guaranteed
+                  to be defined after including one of the headers from Boost.TR1.
+                  Further this macro is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
                 </p>
               </td>
 </tr>
@@ -1952,7 +1963,9 @@
               </td>
 <td>
                 <p>
-                  The library has a TR1 conforming function class template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>.
+                  The library has a TR1 conforming function class template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>. This macro is only guaranteed
+                  to be defined after including one of the headers from Boost.TR1.
+                  Further this macro is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
                 </p>
               </td>
 </tr>
@@ -1969,7 +1982,9 @@
               </td>
 <td>
                 <p>
-                  The library has a TR1 conforming hash function template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>.
+                  The library has a TR1 conforming hash function template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span></code>. This macro is only guaranteed
+                  to be defined after including one of the headers from Boost.TR1.
+                  Further this macro is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
                 </p>
               </td>
 </tr>
@@ -1988,6 +2003,9 @@
                 <p>
                   The library has a TR1 conforming <code class="computeroutput"><span class="identifier">shared_ptr</span></code>
                   class template in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">memory</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_SMART_PTR.
                 </p>
               </td>
 </tr>
@@ -2005,6 +2023,9 @@
 <td>
                 <p>
                   The library has a TR1 conforming version of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">random</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_RANDOM.
                 </p>
               </td>
 </tr>
@@ -2022,6 +2043,9 @@
 <td>
                 <p>
                   The library has a TR1 conforming version of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">regex</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_REGEX.
                 </p>
               </td>
 </tr>
@@ -2039,6 +2063,9 @@
 <td>
                 <p>
                   The library has a TR1 conforming version of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">tuple</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_TUPLE.
                 </p>
               </td>
 </tr>
@@ -2056,6 +2083,9 @@
 <td>
                 <p>
                   The library has a TR1 conforming version of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">type_traits</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_TYPE_TRAITS.
                 </p>
               </td>
 </tr>
@@ -2074,6 +2104,9 @@
                 <p>
                   The library has the TR1 additions to <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">utility</span><span class="special">&gt;</span></code>
                   (tuple interface to <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code>).
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_TUPLE.
                 </p>
               </td>
 </tr>
@@ -2091,6 +2124,9 @@
 <td>
                 <p>
                   The library has a TR1 conforming version of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">unordered_map</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_UNORDERED_MAP.
                 </p>
               </td>
 </tr>
@@ -2108,6 +2144,9 @@
 <td>
                 <p>
                   The library has a TR1 conforming version of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">unordered_set</span><span class="special">&gt;</span></code>.
+                  This macro is only guaranteed to be defined after including one
+                  of the headers from Boost.TR1. Further this macro is now deprecated
+                  in favour of BOOST_NO_CXX11_HDR_UNORDERED_SET.
                 </p>
               </td>
 </tr>
@@ -3656,6 +3695,29 @@
               </td>
 </tr>
 <tr>
+<td>
+                <p>
+                  <code class="computeroutput"><span class="identifier">BOOST_GCC</span></code>
+                </p>
+              </td>
+<td>
+                <p>
+                  <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">config</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
+                </p>
+              </td>
+<td>
+                <p>
+                  Defined if the compiler is really GCC, as opposed to one of the
+                  many other compilers that also define <code class="computeroutput"><span class="identifier">__GNUC__</span></code>.
+                  Has the value: <code class="computeroutput"><span class="identifier">__GNUC__</span>
+                  <span class="special">*</span> <span class="number">10000</span>
+                  <span class="special">+</span> <span class="identifier">__GNUC_MINOR__</span>
+                  <span class="special">*</span> <span class="number">100</span>
+                  <span class="special">+</span> <span class="identifier">__GNUC_PATCHLEVEL__</span></code>.
+                </p>
+              </td>
+</tr>
+<tr>
 <td>
                 <p>
                   <code class="computeroutput"><span class="identifier">BOOST_INTEL</span></code>
diff --git a/doc/html/index.html b/doc/html/index.html
index 7bfddf23..bdf89c1b 100644
--- a/doc/html/index.html
+++ b/doc/html/index.html
@@ -951,7 +951,7 @@
 </div>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"><p><small>Last revised: January 17, 2013 at 02:10:17 GMT</small></p></td>
+<td align="left"><p><small>Last revised: February 19, 2013 at 16:25:18 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>
diff --git a/doc/macro_reference.qbk b/doc/macro_reference.qbk
index 89bd4754..6b424546 100644
--- a/doc/macro_reference.qbk
+++ b/doc/macro_reference.qbk
@@ -28,7 +28,7 @@ compiler's conformance with the 2003 standard.
 
 
 [[`BOOST_BCB_PARTIAL_SPECIALIZATION_BUG`][Compiler][
-The compiler exibits certain partial specialisation bug - probably Borland
+The compiler exhibits certain partial specialisation bug - probably Borland
 C++ Builder specific.
 ]]
 [[`BOOST_FUNCTION_SCOPE_USING_DECLARATION_BREAKS_ADL`][Compiler][
@@ -429,7 +429,9 @@ The standard library lacks a conforming `std::use_facet`, but has a workaround
 class-version that does the job. This is primarily for the STLport std lib.
 ]]
 [[`BOOST_HAS_TR1_ARRAY`][Standard library][
-The library has a TR1 conforming version of `<array>`.
+The library has a TR1 conforming version of `<array>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_ARRAY.
 ]]
 [[`BOOST_HAS_TR1_COMPLEX_OVERLOADS`][Standard library][
 The library has a version of `<complex>` that supports passing scalars to the
@@ -440,46 +442,74 @@ The library has a version of `<complex>` that includes the new inverse trig
 functions from TR1.
 ]]
 [[`BOOST_HAS_TR1_REFERENCE_WRAPPER`][Standard library][
-The library has TR1 conforming reference wrappers in `<functional>`.
+The library has TR1 conforming reference wrappers in `<functional>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
 ]]
 [[`BOOST_HAS_TR1_RESULT_OF`][Standard library][
-The library has a TR1 conforming result_of template in `<functional>`.
+The library has a TR1 conforming result_of template in `<functional>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
 ]]
 [[`BOOST_HAS_TR1_MEM_FN`][Standard library][
-The library has a TR1 conforming mem_fn function template in `<functional>`.
+The library has a TR1 conforming mem_fn function template in `<functional>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
 ]]
 [[`BOOST_HAS_TR1_BIND`][Standard library][
-The library has a TR1 conforming bind function template in `<functional>`.
+The library has a TR1 conforming bind function template in `<functional>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
 ]]
 [[`BOOST_HAS_TR1_FUNCTION`][Standard library][
-The library has a TR1 conforming function class template in `<functional>`.
+The library has a TR1 conforming function class template in `<functional>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
 ]]
 [[`BOOST_HAS_TR1_HASH`][Standard library][
-The library has a TR1 conforming hash function template in `<functional>`.
+The library has a TR1 conforming hash function template in `<functional>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_FUNCTIONAL.
 ]]
 [[`BOOST_HAS_TR1_SHARED_PTR`][Standard library][
-The library has a TR1 conforming `shared_ptr` class template in `<memory>`.
+The library has a TR1 conforming `shared_ptr` class template in `<memory>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_SMART_PTR.
 ]]
 [[`BOOST_HAS_TR1_RANDOM`][Standard library][
-The library has a TR1 conforming version of `<random>`.
+The library has a TR1 conforming version of `<random>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_RANDOM.
 ]]
 [[`BOOST_HAS_TR1_REGEX`][Standard library][
-The library has a TR1 conforming version of `<regex>`.
+The library has a TR1 conforming version of `<regex>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_REGEX.
 ]]
 [[`BOOST_HAS_TR1_TUPLE`][Standard library][
-The library has a TR1 conforming version of `<tuple>`.
+The library has a TR1 conforming version of `<tuple>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_TUPLE.
 ]]
 [[`BOOST_HAS_TR1_TYPE_TRAITS`][Standard library][
-The library has a TR1 conforming version of `<type_traits>`.
+The library has a TR1 conforming version of `<type_traits>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_TYPE_TRAITS.
 ]]
 [[`BOOST_HAS_TR1_UTILITY`][Standard library][
-The library has the TR1 additions to `<utility>` (tuple interface to `std::pair`).
+The library has the TR1 additions to `<utility>` (tuple interface to `std::pair`).  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_TUPLE.
 ]]
 [[`BOOST_HAS_TR1_UNORDERED_MAP`][Standard library][
-The library has a TR1 conforming version of `<unordered_map>`.
+The library has a TR1 conforming version of `<unordered_map>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_UNORDERED_MAP.
 ]]
 [[`BOOST_HAS_TR1_UNORDERED_SET`][Standard library][
-The library has a TR1 conforming version of `<unordered_set>`.
+The library has a TR1 conforming version of `<unordered_set>`.  This macro is only guaranteed
+to be defined after including one of the headers from Boost.TR1.  Further this macro
+is now deprecated in favour of BOOST_NO_CXX11_HDR_UNORDERED_SET.
 ]]
 [[`BOOST_HAS_TR1`][Standard library][
 Implies all the other `BOOST_HAS_TR1_*` macros should be set.
@@ -973,6 +1003,11 @@ Defined to a normalised 9 digit version of _MSC_FULL_VER (which sometimes only h
 the macro has the form VVMMPPPPP where VV is the major version number, MM is the minor version number, and
 PPPPP is the compiler build number.
 ]]
+[[`BOOST_GCC`][`<boost/config.hpp>`][
+Defined if the compiler is really GCC, as opposed to one
+of the many other compilers that also define `__GNUC__`.  Has the value:
+`__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__`.
+]]
 [[`BOOST_INTEL`][`<boost/config.hpp>`][
 Defined if the compiler is an Intel compiler, takes the same value as the
 compiler version macro.
diff --git a/include/boost/config/compiler/gcc.hpp b/include/boost/config/compiler/gcc.hpp
index c0ac30af..b3e7b85f 100644
--- a/include/boost/config/compiler/gcc.hpp
+++ b/include/boost/config/compiler/gcc.hpp
@@ -11,7 +11,12 @@
 
 //  See http://www.boost.org for most recent version.
 
-//  GNU C++ compiler setup:
+//  GNU C++ compiler setup.
+
+//
+// Define BOOST_GCC so we know this is "real" GCC and not some pretender:
+//
+#define BOOST_GCC (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
 
 #if __GNUC__ < 3
 #   if __GNUC_MINOR__ == 91