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

/etc/snippets?id=ad5a8c0fc1773517b3bd27a07f9c0ab4fe47249b'>commit</a><a href='/guix/diff/etc/snippets?id=ad5a8c0fc1773517b3bd27a07f9c0ab4fe47249b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/snippets'>
<input type='hidden' name='id' value='ad5a8c0fc1773517b3bd27a07f9c0ab4fe47249b'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=ad5a8c0fc1773517b3bd27a07f9c0ab4fe47249b'>root</a>/<a href='/guix/log/etc?id=ad5a8c0fc1773517b3bd27a07f9c0ab4fe47249b'>etc</a>/<a href='/guix/log/etc/snippets?id=ad5a8c0fc1773517b3bd27a07f9c0ab4fe47249b'>snippets</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/snippets?id=ad5a8c0fc1773517b3bd27a07f9c0ab4fe47249b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-05-09 00:22:37 -0400'>2019-05-09</span></td><td><a href='/guix/commit/etc/snippets?id=4ac69ea10f54384ac893313ef738e5ad554ac328'>Add (guix bzr-download).</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/bzr-download.scm, guix/build/bzr.scm,
etc/snippets/scheme-mode/guix-bzr-reference: New files.
* Makefile.am (MODULES): Add them.
* etc/snippets/scheme-mode/guix-origin: Add "bzr-fetch" to the origin choices.
</span></span></td><td>Maxim Cournoyer</td></tr>