diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index dbb7d8e4b54..8ad9c2f29f8 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,13 @@
 2019-01-15  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/erase_if.h [__cplusplus > 201703L]
+	(__cpp_lib_erase_if): Only define for C++2a.
+	* include/std/iterator [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
+	(__cpp_lib_null_iterators): Define.
+	* include/std/version [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
+	(__cpp_lib_null_iterators): Define.
+	[__cpp_impl_destroying_delete] (__cpp_lib_destroying_delete): Define.
+
 	* doc/xml/manual/status_cxx2017.xml: Document P0032R3 and P0307R2
 	status.
 	* include/bits/stl_uninitialized.h (__cpp_lib_raw_memory_algorithms):
diff --git a/libstdc++-v3/include/bits/erase_if.h b/libstdc++-v3/include/bits/erase_if.h
index d84f5ffc8ed..4641dbebd85 100644
--- a/libstdc++-v3/include/bits/erase_if.h
+++ b/libstdc++-v3/include/bits/erase_if.h
@@ -38,7 +38,9 @@ namespace std
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
-#define __cpp_lib_erase_if 201900L
+#if __cplusplus > 201703L
+# define __cpp_lib_erase_if 201900L
+#endif
 
   namespace __detail
   {
diff --git a/libstdc++-v3/include/std/iterator b/libstdc++-v3/include/std/iterator
index 5c6903c1cff..9d9e19c4c6b 100644
--- a/libstdc++-v3/include/std/iterator
+++ b/libstdc++-v3/include/std/iterator
@@ -67,4 +67,8 @@
 #include <bits/streambuf_iterator.h>
 #include <bits/range_access.h>
 
+#if __cplusplus >= 201402L && ! defined _GLIBCXX_DEBUG // PR libstdc++/70303
+# define __cpp_lib_null_iterators 201304L
+#endif
+
 #endif /* _GLIBCXX_ITERATOR */
diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index f49a45940f9..36d291dcf93 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -42,6 +42,10 @@
 # define __cpp_lib_uncaught_exceptions 201411L
 #endif
 
+#if __cpp_impl_destroying_delete
+# define __cpp_lib_destroying_delete 201806L
+#endif
+
 #if __cplusplus >= 201103L
 // c++11
 #define __cpp_lib_allocator_is_always_equal 201411
@@ -71,6 +75,9 @@
 #define __cpp_lib_is_final 201402L
 #define __cpp_lib_make_reverse_iterator 201402
 #define __cpp_lib_make_unique 201304
+#ifndef _GLIBCXX_DEBUG // PR libstdc++/70303
+# define __cpp_lib_null_iterators 201304L
+#endif
 #define __cpp_lib_quoted_string_io 201304
 #define __cpp_lib_robust_nonmodifying_seq_ops 201304
 #ifdef _GLIBCXX_HAS_GTHREADS