Index: g++.dg/cpp1y/feat-cxx11-neg.C
===================================================================
--- g++.dg/cpp1y/feat-cxx11-neg.C	(revision 0)
+++ g++.dg/cpp1y/feat-cxx11-neg.C	(working copy)
@@ -0,0 +1,35 @@
+// { dg-do compile { target c++11_only } }
+
+// These *are* defined in C++14 onwards.
+
+#ifndef __cpp_binary_literals
+#  error "__cpp_binary_literals" // { dg-error "error" }
+#endif
+
+#ifndef __cpp_init_captures
+#  error "__cpp_init_captures" // { dg-error "error" }
+#endif
+
+#ifndef __cpp_generic_lambdas
+#  error "__cpp_generic_lambdas" // { dg-error "error" }
+#endif
+
+#ifndef __cpp_decltype_auto
+#  error "__cpp_decltype_auto" // { dg-error "error" }
+#endif
+
+#ifndef __cpp_return_type_deduction
+#  error "__cpp_return_type_deduction" // { dg-error "error" }
+#endif
+
+#ifndef __cpp_runtime_arrays
+#  error "__cpp_runtime_arrays" // { dg-error "error" }
+#endif
+
+#ifndef __cpp_digit_separators
+#  error "__cpp_digit_separators" // { dg-error "error" }
+#endif
+
+#ifndef __cpp_attribute_deprecated
+#  error "__cpp_attribute_deprecated" // { dg-error "error" }
+#endif
Index: g++.dg/cpp1y/feat-cxx11.C
===================================================================
--- g++.dg/cpp1y/feat-cxx11.C	(revision 0)
+++ g++.dg/cpp1y/feat-cxx11.C	(working copy)
@@ -0,0 +1,73 @@
+// { dg-do compile { target c++11_only } }
+
+#ifndef __cpp_unicode_characters
+#  error "__cpp_unicode_characters"
+#elif  __cpp_unicode_characters != 200704
+#  error "__cpp_unicode_characters != 200704"
+#endif
+
+#ifndef __cpp_raw_strings
+#  error "__cpp_raw_strings"
+#elif  __cpp_raw_strings != 200710
+#  error "__cpp_raw_strings != 200710"
+#endif
+
+#ifndef __cpp_unicode_literals
+#  error "__cpp_unicode_literals"
+#elif  __cpp_unicode_literals != 200710
+#  error "__cpp_unicode_literals != 200710"
+#endif
+
+#ifndef __cpp_user_defined_literals
+#  error "__cpp_user_defined_literals"
+#elif  __cpp_user_defined_literals != 200809
+#  error "__cpp_user_defined_literals != 200809"
+#endif
+
+#ifndef __cpp_lambdas
+#  error "__cpp_lambdas"
+#elif  __cpp_lambdas != 200907
+#  error "__cpp_lambdas != 200907"
+#endif
+
+#ifndef __cpp_constexpr
+#  error "__cpp_constexpr"
+#elif  __cpp_constexpr != 200704
+#  error "__cpp_constexpr != 200704"
+#endif
+
+#ifndef __cpp_static_assert
+#  error "__cpp_static_assert"
+#elif  __cpp_static_assert != 200410
+#  error "__cpp_static_assert != 200410"
+#endif
+
+#ifndef __cpp_decltype
+#  error "__cpp_decltype"
+#elif  __cpp_decltype != 200707
+#  error "__cpp_decltype != 200707"
+#endif
+
+#ifndef __cpp_attributes
+#  error "__cpp_attributes"
+#elif  __cpp_attributes != 200809
+#  error "__cpp_attributes != 200809"
+#endif
+
+#ifndef __cpp_rvalue_reference
+#  error "__cpp_rvalue_reference"
+#elif  __cpp_rvalue_reference != 200610
+#  error "__cpp_rvalue_reference != 200610"
+#endif
+
+#ifndef __cpp_variadic_templates
+#  error "__cpp_variadic_templates"
+#elif  __cpp_variadic_templates != 200704
+#  error "__cpp_variadic_templates != 200704"
+#endif
+
+#ifndef __cpp_alias_templates
+#  error "__cpp_alias_templates"
+#elif  __cpp_alias_templates != 200704
+#  error "__cpp_alias_templates != 200704"
+#endif
Index: g++.dg/cpp1y/feat-cxx14-neg.C
===================================================================
--- g++.dg/cpp1y/feat-cxx14-neg.C	(revision 0)
+++ g++.dg/cpp1y/feat-cxx14-neg.C	(working copy)
@@ -0,0 +1,8 @@
+// { dg-do compile { target c++1y } }
+
+//  TODO: Change != to == when C++14 constexpr goes in.
+#ifndef __cpp_constexpr
+#  error "__cpp_constexpr"
+#elif __cpp_constexpr != 200704
+#  error "__cpp_constexpr != 200704" // { dg-error "error" }
+#endif
Index: g++.dg/cpp1y/feat-cxx14.C
===================================================================
--- g++.dg/cpp1y/feat-cxx14.C	(revision 0)
+++ g++.dg/cpp1y/feat-cxx14.C	(working copy)
@@ -0,0 +1,187 @@
+// { dg-do compile { target c++1y } }
+// { dg-options "-I . -I testinc" }
+
+// Begin C++11 tests.
+
+#ifndef __cpp_unicode_characters
+#  error "__cpp_unicode_characters"
+#endif
+
+#ifndef __cpp_raw_strings
+#  error "__cpp_raw_strings"
+#endif
+
+#ifndef __cpp_unicode_literals
+#  error "__cpp_unicode_literals"
+#endif
+
+#ifndef __cpp_user_defined_literals
+#  error "__cpp_user_defined_literals"
+#endif
+
+#ifndef __cpp_lambdas
+#  error "__cpp_lambdas"
+#endif
+
+#ifndef __cpp_constexpr
+#  error "__cpp_constexpr"
+#endif
+
+#ifndef __cpp_static_assert
+#  error "__cpp_static_assert"
+#endif
+
+#ifndef __cpp_decltype
+#  error "__cpp_decltype"
+#endif
+
+#ifndef __cpp_attributes
+#  error "__cpp_attributes"
+#endif
+
+#ifndef __cpp_rvalue_reference
+#  error "__cpp_rvalue_reference"
+#endif
+
+#ifndef __cpp_variadic_templates
+#  error "__cpp_variadic_templates"
+#endif
+
+// Begin C++14 tests.
+
+#ifndef __cpp_binary_literals
+#  error "__cpp_binary_literals"
+#endif
+
+#ifndef __cpp_init_captures
+#  error "__cpp_init_captures"
+#endif
+
+#ifndef __cpp_generic_lambdas
+#  error "__cpp_generic_lambdas"
+#endif
+
+//  TODO: Change <= to < when C++14 constexpr goes in.
+#ifdef __cpp_constexpr
+#  if __cpp_constexpr <= 201304
+#    error "__cpp_constexpr"
+#  endif
+#endif
+
+#ifndef __cpp_decltype_auto
+#  error "__cpp_decltype_auto"
+#endif
+
+#ifndef __cpp_return_type_deduction
+#  error "__cpp_return_type_deduction"
+#endif
+
+#ifndef __cpp_runtime_arrays
+#  error "__cpp_runtime_arrays"
+#endif
+
+//  Aggregate initializers not in yet.
+#ifdef __cpp_aggregate_nsdmi
+#  error "__cpp_aggregate_nsdmi"
+#endif
+
+//  Variable templates not in yet.
+#ifdef __cpp_variable_templates
+#  error "__cpp_variable_templates"
+#endif
+
+#ifndef __cpp_digit_separators
+#  error "__cpp_digit_separators"
+#endif
+
+#ifndef __cpp_attribute_deprecated
+#  error "__cpp_attribute_deprecated"
+#endif
+
+//  Sized deallocation not in yet.
+#ifdef __cpp_sized_deallocation
+#  error "__cpp_sized_deallocation"
+#endif
+
+// Begin include checks.
+
+//  Check for __has_include macro.
+#ifndef __has_include
+#  error "__has_include"
+#endif
+
+//  Quoted complex.h should find at least the bracket version (use operator).
+#if __has_include__ "complex.h"
+#else
+#  error "complex.h"
+#endif
+
+//  Try known bracket header (use operator).
+#if __has_include__(<complex>)
+#else
+#  error "<complex>"
+#endif
+
+//  Define and use a macro to invoke the operator.
+#define sluggo(TXT) __has_include__(TXT)
+
+#if sluggo(<complex>)
+#else
+#  error "<complex>"
+#endif
+
+#if ! sluggo(<complex>)
+#  error "<complex>"
+#else
+#endif
+
+//  Quoted complex.h should find at least the bracket version.
+#if __has_include("complex.h")
+#else
+#  error "complex.h"
+#endif
+
+//  Try known local quote header.
+#if __has_include("complex_literals.h")
+#else
+#  error "\"complex_literals.h\""
+#endif
+
+//  Try nonexistent bracket header.
+#if __has_include(<stuff>)
+#  error "<stuff>"
+#else
+#endif
+
+//  Try nonexistent quote header.
+#if __has_include("phlegm")
+#  error "\"phlegm\""
+#else
+#endif
+
+//  Test __has_include_next.
+#if __has_include("phoobhar.h")
+#  include "phoobhar.h"
+#else
+#  error "phoobhar.h"
+#endif
+
+//  Try a macro.
+#define COMPLEX_INC "complex.h"
+#if __has_include(COMPLEX_INC)
+#else
+#  error COMPLEX_INC
+#endif
+
+//  Realistic use of __has_include.
+#if __has_include(<array>)
+#  define STD_ARRAY 1
+#  include <array>
+  template<typename _Tp, size_t _Num>
+    using array = std::array<_Tp, _Num>;
+#elif __has_include(<tr1/array>)
+#  define TR1_ARRAY 1
+#  include <tr1/array>
+  template<typename _Tp, size_t _Num>
+    typedef std::tr1::array<_Tp, _Num> array;
+#endif
Index: g++.dg/cpp1y/phoobhar.h
===================================================================
--- g++.dg/cpp1y/phoobhar.h	(revision 0)
+++ g++.dg/cpp1y/phoobhar.h	(working copy)
@@ -0,0 +1,16 @@
+
+int
+phoo();
+
+int
+bhar();
+
+#ifndef __has_include_next
+#  error "__has_include_next"
+#else
+#  if __has_include_next("phoobhar.h")
+#    include_next "phoobhar.h"
+#  else
+#    error "phoobhar.h"
+#  endif
+#endif
