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This patch was downloaded from https://sft.its.cern.ch/jira/browse/ROOT-7047.
It fixes the build of clang 3.5 with GCC 5.  File paths have been adjusted.

From 00f3ed6eee41da871799ad0fd19153c7682d61fe Mon Sep 17 00:00:00 2001
From: Alexander Klimov <alserkli@inbox.ru>
Date: Mon, 26 Jan 2015 18:45:23 +0200
Subject: [PATCH] [ADT/IntrusiveRefCntPtr] Give friend access to
 IntrusiveRefCntPtr<X> so the relevant move constructor can
 access 'Obj'.

From LLVM upstream:
Author: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date:   Tue Sep 23 06:06:43 2014 +0000
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218295 91177308-0d34-0410-b5e6-96231b3b80d8
---
 interpreter/llvm/src/include/llvm/ADT/IntrusiveRefCntPtr.h |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/llvm/ADT/IntrusiveRefCntPtr.h b/include/llvm/ADT/IntrusiveRefCntPtr.h
index f9df378..c859c98 100644
--- a/include/llvm/ADT/IntrusiveRefCntPtr.h
+++ b/include/llvm/ADT/IntrusiveRefCntPtr.h
@@ -197,6 +197,9 @@ public:
   private:
     void retain() { if (Obj) IntrusiveRefCntPtrInfo<T>::retain(Obj); }
     void release() { if (Obj) IntrusiveRefCntPtrInfo<T>::release(Obj); }
+
+    template <typename X>
+    friend class IntrusiveRefCntPtr;
   };
 
   template<class T, class U>
-- 
1.7.10.4