From e2fb1d982291bfc87693d8a0744213ef22a75c14 Mon Sep 17 00:00:00 2001
From: Antal Tátrai <antal.tatrai@gmail.com>
Date: Tue, 8 Mar 2016 20:01:42 +0100
Subject: Comment has been added to fix (issue #1266)

---
 src/google/protobuf/map.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/google/protobuf/map.h')

diff --git a/src/google/protobuf/map.h b/src/google/protobuf/map.h
index 9dd42572..37e19b0a 100644
--- a/src/google/protobuf/map.h
+++ b/src/google/protobuf/map.h
@@ -548,6 +548,10 @@ class Map {
     !defined(GOOGLE_PROTOBUF_OS_NACL) && !defined(GOOGLE_PROTOBUF_OS_ANDROID)
     template<class NodeType, class... Args>
     void construct(NodeType* p, Args&&... args) {
+      // Clang 3.6 doesn't compile static casting to void* directly. (Issue #1266)
+      // According C++ standard 5.2.9/1: "The static_cast operator shall not cast
+      // away constness". So first the maybe const pointer is casted to const void* and
+      // after the const void* is const casted.
       new (const_cast<void*>(static_cast<const void*>(p))) NodeType(std::forward<Args>(args)...);
     }
 
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