From dc062a0844d9d5050724302478f2d1c0cf0c813e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Lalinsk=C3=BD?= <lalinsky@gmail.com>
Date: Sun, 15 May 2011 00:07:29 +0200
Subject: [PATCH] Make RefCounter compile on OS X with the 10.4 SDK

The 10.4 SDK defines OSAtomic functions as int32_t, while 10.5 and newer SDKs
define them as volatile int32_t. This caused a compilation error when
compiling against the 10.4 SDK.

I'd have prefered a preprocessor-based solution, but I couldn't find any
macro that says the SDK version, so I copied this cast solution from
Apple's WebKit. I assume then know what they are doing if they have to
workaround their own API. :)
---
 taglib/toolkit/taglib.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/taglib/toolkit/taglib.h b/taglib/toolkit/taglib.h
index 922640d1..c42f1bde 100644
--- a/taglib/toolkit/taglib.h
+++ b/taglib/toolkit/taglib.h
@@ -100,8 +100,8 @@ namespace TagLib {
     RefCounter() : refCount(1) {}
 
 #ifdef TAGLIB_ATOMIC_MAC
-    void ref() { OSAtomicIncrement32Barrier(&refCount); }
-    bool deref() { return ! OSAtomicDecrement32Barrier(&refCount); }
+    void ref() { OSAtomicIncrement32Barrier(const_cast<int32_t*>(&refCount)); }
+    bool deref() { return ! OSAtomicDecrement32Barrier(const_cast<int32_t*>(&refCount)); }
     int32_t count() { return refCount; }
   private:
     volatile int32_t refCount;