Merge branch 'boost_no_cxx11_sfinae_expr' of https://github.com/glenfe/config into pr114

# Fixed Conflicts:
#	checks/Jamfile.v2
#	checks/test_case.cpp
#	test/all/Jamfile.v2
#	test/config_test.cpp

Also added some more documentation to tie together the various SFINAE macros.  Regenerated the docs.

doc/html/boost_config/boost_macro_reference.html

@@ -517,7 +517,7 @@
                   is covered by <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#337" target="_top">Core
                   Language DR337</a>, but is not part of the current standard.
                   Fortunately most compilers that support SFINAE also support this
-                  DR.
+                  DR. See also BOOST_NO_SFINAE and BOOST_NO_SFINAE_EXPR
                 </p>
               </td>
 </tr>
@@ -864,7 +864,8 @@
 <td>
                 <p>
                   The compiler does not support the "Substitution Failure Is
-                  Not An Error" meta-programming idiom.
+                  Not An Error" meta-programming idiom. This is the lightweight
+                  pre-C++11 version of SFINAE.
                 </p>
               </td>
 </tr>
@@ -882,6 +883,8 @@
 <td>
                 <p>
                   The compiler does not support usage of SFINAE with arbitrary expressions.
+                  This is the post-C++11 SFINAE, but excludes a few specific corner
+                  cases, see also BOOST_NO_CXX11_SFINAE_EXPR.
                 </p>
               </td>
 </tr>
@@ -3073,6 +3076,22 @@
               </td>
 </tr>
 <tr>
+<td>
+                <p>
+                  <code class="computeroutput"><span class="identifier">BOOST_NO_CXX11_SFINAE_EXPR</span></code>
+                </p>
+              </td>
+<td>
+                <p>
+                  The compiler does not support usage of C++11 SFINAE with arbitrary
+                  expressions. Use this macro only if you are using all of the features
+                  of SFINAE including substitution-failure-on-private-member-access.
+                  Otherwise use BOOST_NO_SFINAE_EXPR or BOOST_NO_SFINAE which get
+                  defined for fewer compilers.
+                </p>
+              </td>
+</tr>
+<tr>
 <td>
                 <p>
                   <code class="computeroutput"><span class="identifier">BOOST_NO_CXX11_SMART_PTR</span></code>

doc/html/index.html

@@ -990,7 +990,7 @@
 </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: February 05, 2017 at 19:01:00 GMT</small></p></td>
+<td align="left"><p><small>Last revised: February 05, 2017 at 19:27:06 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>

doc/macro_reference.qbk

@@ -138,7 +138,7 @@ The standard library lacks `<iostream>`, `<istream>` or `<ostream>`.
 [[`BOOST_NO_IS_ABSTRACT`][Compiler][
 The C++ compiler does not support SFINAE with abstract types, this is covered
 by __CORE_LANGUAGE_DR337__, but is not part of the current standard.  Fortunately
-most compilers that support SFINAE also support this DR.
+most compilers that support SFINAE also support this DR.  See also BOOST_NO_SFINAE and BOOST_NO_SFINAE_EXPR
 ]]
 [[`BOOST_NO_LIMITS`][Standard library][
 The C++ implementation does not provide the `<limits>` header. Never check for
@@ -218,10 +218,11 @@ of an object is not supported.
 ]]
 [[`BOOST_NO_SFINAE`][Compiler][
 The compiler does not support the "Substitution Failure Is Not An Error"
-meta-programming idiom.
+meta-programming idiom.  This is the lightweight pre-C++11 version of SFINAE.
 ]]
 [[`BOOST_NO_SFINAE_EXPR`][Compiler][
-The compiler does not support usage of SFINAE with arbitrary expressions.
+The compiler does not support usage of SFINAE with arbitrary expressions.  This is the
+post-C++11 SFINAE, but excludes a few specific corner cases, see also BOOST_NO_CXX11_SFINAE_EXPR.
 ]]
 [[`BOOST_NO_STD_ALLOCATOR`][Standard library][
 The C++ standard library does not provide a standards conforming
@@ -695,6 +696,11 @@ r-value references.
 [[`BOOST_NO_CXX11_SCOPED_ENUMS`][The compiler does not support
 scoped enumerations (`enum class`). 
 ]]
+[[`BOOST_NO_CXX11_SFINAE_EXPR`][The compiler does not support
+usage of C++11 SFINAE with arbitrary expressions.  Use this macro only if you
+are using all of the features of SFINAE including substitution-failure-on-private-member-access.  
+Otherwise use BOOST_NO_SFINAE_EXPR or BOOST_NO_SFINAE which get defined for fewer compilers.
+]]
 [[`BOOST_NO_CXX11_SMART_PTR`][The standard library header <memory> has no shared_ptr and unique_ptr.]]
 [[`BOOST_NO_CXX11_STATIC_ASSERT`][The compiler does not support
 `static_assert`.