From a902e2588d3917c867632e120906019cfca409fa Mon Sep 17 00:00:00 2001
From: Chris Kennelly <ckennelly@google.com>
Date: Wed, 14 Dec 2016 14:03:55 -0800
Subject: Define LANG_CXX11 for port.h and use this to guard C++11 features.

---
 src/google/protobuf/generated_message_util.h | 4 ++--
 src/google/protobuf/stubs/port.h             | 9 +++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/google/protobuf/generated_message_util.h b/src/google/protobuf/generated_message_util.h
index 19bac7dc..14101832 100644
--- a/src/google/protobuf/generated_message_util.h
+++ b/src/google/protobuf/generated_message_util.h
@@ -46,7 +46,7 @@
 #include <google/protobuf/has_bits.h>
 
 #ifndef PROTOBUF_FINAL
-#if __cplusplus >= 201103L
+#if LANG_CXX11
 #define PROTOBUF_FINAL final
 #else
 #define PROTOBUF_FINAL
@@ -99,7 +99,7 @@ class ExplicitlyConstructed {
     }
   }
 
-#if __cplusplus >= 201103L
+#if LANG_CXX11
   constexpr
 #endif
       const T&
diff --git a/src/google/protobuf/stubs/port.h b/src/google/protobuf/stubs/port.h
index d5ef166e..72adba6d 100644
--- a/src/google/protobuf/stubs/port.h
+++ b/src/google/protobuf/stubs/port.h
@@ -97,6 +97,15 @@
 
 // ===================================================================
 // from google3/base/port.h
+
+#if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L || \
+     (defined(_MSC_VER) && _MSC_VER >= 1900))
+// Define this to 1 if the code is compiled in C++11 mode; leave it
+// undefined otherwise.  Do NOT define it to 0 -- that causes
+// '#ifdef LANG_CXX11' to behave differently from '#if LANG_CXX11'.
+#define LANG_CXX11 1
+#endif
+
 namespace google {
 namespace protobuf {
 
-- 
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