diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 138a0208b20..e92e6d8a541 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,9 @@
+2016-12-07  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/18_support/headers/new/synopsis.cc: Add C++14 and C++17
+	declarations.
+	* testsuite/18_support/headers/new/synopsis_cxx98.cc: New test.
+
 2016-12-06  Felipe Magno de Almeida  <felipe@expertisesolutions.com.br>
 
 	* src/c++11/cow-stdexcept.cc: Add special case for 16 bit pointers.
diff --git a/libstdc++-v3/testsuite/18_support/headers/new/synopsis.cc b/libstdc++-v3/testsuite/18_support/headers/new/synopsis.cc
index f193bf25994..8013eea1057 100644
--- a/libstdc++-v3/testsuite/18_support/headers/new/synopsis.cc
+++ b/libstdc++-v3/testsuite/18_support/headers/new/synopsis.cc
@@ -21,18 +21,25 @@
 
 namespace std {
   class bad_alloc;
+  class bad_array_new_length;
   struct nothrow_t;
   extern const nothrow_t nothrow;
   typedef void (*new_handler)();
-  new_handler set_new_handler(new_handler new_p) throw();
   new_handler get_new_handler() noexcept;
+  new_handler set_new_handler(new_handler new_p) noexcept;
+
+#if __cplusplus > 201402L
+  enum class align_val_t : size_t;
+  // static constexpr size_t hardware_destructive_interference_size;
+  // static constexpr size_t hardware_constructive_interference_size;
+#endif
 }
 
-void* operator new(std::size_t size) throw(std::bad_alloc);
-void* operator new(std::size_t size, const std::nothrow_t&) throw();
+void* operator new(std::size_t size);
+void* operator new(std::size_t size, const std::nothrow_t&) noexcept;
 void  operator delete(void* ptr) throw();
 void  operator delete(void* ptr, const std::nothrow_t&) throw();
-void* operator new[](std::size_t size) throw(std::bad_alloc);
+void* operator new[](std::size_t size);
 void* operator new[](std::size_t size, const std::nothrow_t&) throw();
 void  operator delete[](void* ptr) throw();
 void  operator delete[](void* ptr, const std::nothrow_t&) throw();
@@ -41,3 +48,32 @@ void* operator new  (std::size_t size, void* ptr) throw();
 void* operator new[](std::size_t size, void* ptr) throw();
 void  operator delete  (void* ptr, void*) throw();
 void  operator delete[](void* ptr, void*) throw();
+
+#if __cplusplus >= 201402L
+// C++14 sized deallocation functions
+void  operator delete(void* ptr, std::size_t size) noexcept;
+void  operator delete(void* ptr, std::size_t size,
+                      const std::nothrow_t&) noexcept;
+void  operator delete[](void* ptr, std::size_t size) noexcept;
+void  operator delete[](void* ptr, std::size_t size,
+                        const std::nothrow_t&) noexcept;
+#endif
+
+#if __cplusplus > 201402L
+// C++17 (de)allocation functions for types with new-extended alignment
+void* operator new(std::size_t, std::align_val_t);
+void* operator new(std::size_t, std::align_val_t,
+                   const std::nothrow_t&) noexcept;
+void  operator delete(void*, std::align_val_t) noexcept;
+void  operator delete(void*, std::size_t, std::align_val_t) noexcept;
+void  operator delete(void*, std::align_val_t,
+                      const std::nothrow_t&) noexcept;
+
+void* operator new[](std::size_t, std::align_val_t);
+void* operator new[](std::size_t, std::align_val_t,
+                     const std::nothrow_t&) noexcept;
+void  operator delete[](void*, std::align_val_t) noexcept;
+void  operator delete[](void*, std::size_t, std::align_val_t) noexcept;
+void  operator delete[](void*, std::align_val_t,
+                        const std::nothrow_t&) noexcept;
+#endif
diff --git a/libstdc++-v3/testsuite/18_support/headers/new/synopsis_cxx98.cc b/libstdc++-v3/testsuite/18_support/headers/new/synopsis_cxx98.cc
new file mode 100644
index 00000000000..2b2abd2bbdc
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/headers/new/synopsis_cxx98.cc
@@ -0,0 +1,43 @@
+// { dg-options "-std=gnu++98" }
+// { dg-do compile }
+
+// Copyright (C) 2007-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <new>
+
+namespace std {
+  class bad_alloc;
+  struct nothrow_t;
+  extern const nothrow_t nothrow;
+  typedef void (*new_handler)();
+  new_handler set_new_handler(new_handler new_p) throw();
+}
+
+void* operator new(std::size_t size) throw(std::bad_alloc);
+void* operator new(std::size_t size, const std::nothrow_t&) throw();
+void  operator delete(void* ptr) throw();
+void  operator delete(void* ptr, const std::nothrow_t&) throw();
+void* operator new[](std::size_t size) throw(std::bad_alloc);
+void* operator new[](std::size_t size, const std::nothrow_t&) throw();
+void  operator delete[](void* ptr) throw();
+void  operator delete[](void* ptr, const std::nothrow_t&) throw();
+
+void* operator new  (std::size_t size, void* ptr) throw();
+void* operator new[](std::size_t size, void* ptr) throw();
+void  operator delete  (void* ptr, void*) throw();
+void  operator delete[](void* ptr, void*) throw();