Document value of __cplusplus for C++14

	* doc/cpp.texi (Standard Predefined Macros): Document value of
	__cplusplus for C++14.

From-SVN: r228448

gcc/ChangeLog

+2015-10-03  Jonathan Wakely  <jwakely@redhat.com>
+
+	* doc/cpp.texi (Standard Predefined Macros): Document value of
+	__cplusplus for C++14.
+
 2015-10-02  Bernd Schmidt  <bernds@codesourcery.com>
 
 	* gcc.c (process_command): Use spec_machine rather than

gcc/doc/cpp.texi

@@ -1925,10 +1925,13 @@ This macro is defined when the C++ compiler is in use.  You can use
 @code{__cplusplus} to test whether a header is compiled by a C compiler
 or a C++ compiler.  This macro is similar to @code{__STDC_VERSION__}, in
 that it expands to a version number.  Depending on the language standard
-selected, the value of the macro is @code{199711L}, as mandated by the
-1998 C++ standard; @code{201103L}, per the 2011 C++ standard; an
-unspecified value strictly larger than @code{201103L} for the experimental 
-languages enabled by @option{-std=c++1y} and @option{-std=gnu++1y}.
+selected, the value of the macro is
+@code{199711L} for the 1998 C++ standard,
+@code{201103L} for the 2011 C++ standard,
+@code{201402L} for the 2014 C++ standard,
+or an unspecified value strictly larger than @code{201402L} for the
+experimental languages enabled by @option{-std=c++1z} and
+@option{-std=gnu++1z}.
 
 @item __OBJC__
 This macro is defined, with value 1, when the Objective-C compiler is in