Features: Add support for C++14 features.

Record the features implemented by GNU 4.9 and Clang 3.4.

Help/prop_gbl/CMAKE_CXX_KNOWN_FEATURES.rst

@@ -12,6 +12,11 @@ command.
 
 The features known to this version of CMake are:
 
+``cxx_aggregate_default_initializers``
+  Aggregate default initializers, as defined in N3605_.
+
+  .. _N3605: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3605.html
+
 ``cxx_alias_templates``
   Template aliases, as defined in N2258_.
 
@@ -32,16 +37,31 @@ The features known to this version of CMake are:
 
   .. _N2761: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf
 
+``cxx_attribute_deprecated``
+  ``[[deprecated]]`` attribute, as defined in N3760_.
+
+  .. _N3760: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3760.html
+
 ``cxx_auto_type``
   Automatic type deduction, as defined in N1984_.
 
   .. _N1984: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf
 
+``cxx_binary_literals``
+  Binary literals, as defined in N3472_.
+
+  .. _N3472: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf
+
 ``cxx_constexpr``
   Constant expressions, as defined in N2235_.
 
   .. _N2235: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf
 
+``cxx_contextual_conversions``
+  Contextual conversions, as defined in N3323_.
+
+  .. _N3323: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf
+
 ``cxx_decltype_incomplete_return_types``
   Decltype on incomplete return types, as defined in N3276_.
 
@@ -52,6 +72,11 @@ The features known to this version of CMake are:
 
   .. _N2343: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf
 
+``cxx_decltype_auto``
+  ``decltype(auto)`` semantics, as defined in N3638_.
+
+  .. _N3638: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3638.html
+
 ``cxx_default_function_template_args``
   Default template arguments for function templates, as defined in DR226_
 
@@ -77,6 +102,11 @@ The features known to this version of CMake are:
 
   .. _N2346: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm
 
+``cxx_digit_separators``
+  Digit separators, as defined in N3781_.
+
+  .. _N3781: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3781.pdf
+
 ``cxx_enum_forward_declarations``
   Enum forward declarations, as defined in N2764_.
 
@@ -112,6 +142,11 @@ The features known to this version of CMake are:
 
   .. _N2672: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm
 
+``cxx_generic_lambdas``
+  Generic lambdas, ss defined in N3649_.
+
+  .. _N3649: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3649.html
+
 ``cxx_inheriting_constructors``
   Inheriting constructors, as defined in N2540_.
 
@@ -127,6 +162,11 @@ The features known to this version of CMake are:
 
   .. _N2927: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2927.pdf
 
+``cxx_lambda_init_captures``
+  Initialized lambda captures, as defined in N3648_.
+
+  .. _N3648: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3648.html
+
 ``cxx_local_type_template_args``
   Local and unnamed types as template arguments, as defined in N2657_.
 
@@ -172,6 +212,16 @@ The features known to this version of CMake are:
 
   .. _N2439: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm
 
+``cxx_relaxed_constexpr``
+  Relaxed constexpr, as defined in N3652_.
+
+  .. _N3652: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html
+
+``cxx_return_type_deduction``
+  Return type deduction on normal functions, as defined in N3386_.
+
+  .. _N3386: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3386.html
+
 ``cxx_right_angle_brackets``
   Right angle bracket parsing, as defined in N1757_.
 
@@ -227,6 +277,11 @@ The features known to this version of CMake are:
 
   .. _N2765: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf
 
+``cxx_variable_templates``
+  Variable templates, as defined in N3651_.
+
+  .. _N3651: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3651.pdf
+
 ``cxx_variadic_macros``
   Variadic macros, as defined in N1653_.