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

2d1db61f7d6c63aa9'>tree</a><a href='/guix/commit/gnu/packages/chicken.scm?id=cea2e7633ddbce9ce467d752d1db61f7d6c63aa9'>commit</a><a href='/guix/diff/gnu/packages/chicken.scm?id=cea2e7633ddbce9ce467d752d1db61f7d6c63aa9'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/chicken.scm'>
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<div class='path'>path: <a href='/guix/log/?id=cea2e7633ddbce9ce467d752d1db61f7d6c63aa9'>root</a>/<a href='/guix/log/gnu?id=cea2e7633ddbce9ce467d752d1db61f7d6c63aa9'>gnu</a>/<a href='/guix/log/gnu/packages?id=cea2e7633ddbce9ce467d752d1db61f7d6c63aa9'>packages</a>/<a href='/guix/log/gnu/packages/chicken.scm?id=cea2e7633ddbce9ce467d752d1db61f7d6c63aa9'>chicken.scm</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/gnu/packages/chicken.scm?id=cea2e7633ddbce9ce467d752d1db61f7d6c63aa9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-08-31 10:44:46 +0200'>2024-08-31</span></td><td><a href='/guix/commit/gnu/packages/chicken.scm?id=84728d5ba408c11344f78a6da50fd720d74e3c0a'>gnu: Do not eagerly load (gnu packages commencement).</a><span class='msg-avail'>...<span class='msg-tooltip'>As its top comment says, this module is not meant to be imported to avoid
circular module dependencies.

* gnu/packages/chicken.scm (chicken) [propagated-inputs]: Resolve
gcc-toolchain lazily.
* gnu/packages/plan9.scm (plan9port): Likewise.
* gnu/packages/raspberry-pi.scm (raspi-arm64-chainloader)
[native-inputs]: Resolve ld-wrapper lazily.

Change-Id: Ie9859046ed32b67dc53bcc5444d6ae162e5d4022
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2024-07-22 10:58:51 -0500'>2024-07-22</span></td><td><a href='/guix/commit/gnu/packages/chicken.scm?id=e4aabf42b33346849cb565199cfafc49d4f0aeff'>Revert "gnu: chicken: Update to 5.4.0."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 9c3c2293fdc22a6b032bf41d09a6ebe4442324cb.
</span></span></td><td>jgart</td></tr>
<tr><td><span title='2024-07-19 16:40:54 -0500'>2024-07-19</span></td><td><a href='/guix/commit/gnu/packages/chicken.scm?id=9c3c2293fdc22a6b032bf41d09a6ebe4442324cb'>gnu: chicken: Update to 5.4.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chicken.scm (chicken): Update to 5.4.0.

Change-Id: I448bdc25a5cb11e55c7ebb9d9e0cf1876ca958d8
Signed-off-by: jgart &lt;jgart@dismail.de&gt;
</span></span></td><td>Ashish SHUKLA</td></tr>
<tr><td><span title='2023-12-12 11:53:36 -0500'>2023-12-12</span></td><td><a href='/guix/commit/gnu/packages/chicken.scm?id=58bbb38c5bd2e42aab9e9408d8c9d8da3409f178'>gnu: chicken: Update to 5.3.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/chicken.scm (chicken): Update to 5.3.0.

Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
Change-Id: Id3ec15da586ddfc6dae924c0c8031fd7a4613660
</span></span></td><td>Daniel Ziltener</td></tr>