Implemented #ifdefs for OS_OBJECT_USE_OBJC

from iOS 6 and OSX 10.8 GCD objects (like semaphores) use ARC, this compiler flag adjusts the code based on whether or not the current minimum OS supports it

Core/Source/DTAttributedTextContentView.h

@@ -133,7 +133,11 @@
 
 @property (nonatomic, assign) IBOutlet id <DTAttributedTextContentViewDelegate> delegate;	// subtle simulator bug - use assign not __unsafe_unretained
 
-@property (nonatomic, assign) dispatch_semaphore_t selfLock;
+#if OS_OBJECT_USE_OBJC
+@property (nonatomic, strong) dispatch_semaphore_t selfLock;  // GCD objects use ARC
+#else
+@property (nonatomic, assign) dispatch_semaphore_t selfLock;  // GCD objects don't use ARC
+#endif
 
 
 @end

Core/Source/DTAttributedTextContentView.m

@@ -152,8 +152,10 @@ - (void)awakeFromNib
 - (void)dealloc 
 {
 	[self removeAllCustomViews];
-
+
+#if !OS_OBJECT_USE_OBJC
 	dispatch_release(selfLock);
+#endif
 }
 
 - (void)layoutSubviewsInRect:(CGRect)rect

Core/Source/DTCoreTextGlyphRun.m

@@ -23,7 +23,12 @@ @interface DTCoreTextGlyphRun ()
 @property (nonatomic, assign) CGRect frame;
 @property (nonatomic, assign) NSInteger numberOfGlyphs;
 @property (nonatomic, unsafe_unretained, readwrite) NSDictionary *attributes;
-@property (nonatomic, assign) dispatch_semaphore_t runLock;
+
+#if OS_OBJECT_USE_OBJC
+@property (nonatomic, strong) dispatch_semaphore_t runLock; // GCD objects use ARC
+#else
+@property (nonatomic, assign) dispatch_semaphore_t runLock; // GCD objects don't use ARC
+#endif
 
 @end
 
@@ -86,7 +91,9 @@ - (void)dealloc
 		CFRelease(_run);
 	}
 
+#if !OS_OBJECT_USE_OBJC
 	dispatch_release(runLock);
+#endif
 }
 
 - (NSString *)description

Core/Source/DTCoreTextLayouter.m

@@ -11,7 +11,12 @@
 @interface DTCoreTextLayouter ()
 
 @property (nonatomic, strong) NSMutableArray *frames;
-@property (nonatomic, assign) dispatch_semaphore_t selfLock;
+
+#if OS_OBJECT_USE_OBJC
+@property (nonatomic, strong) dispatch_semaphore_t selfLock;  // GCD objects use ARC
+#else
+@property (nonatomic, assign) dispatch_semaphore_t selfLock;  // GCD objects don't use ARC
+#endif
 
 - (CTFramesetterRef)framesetter;
 - (void)discardFramesetter;
@@ -53,7 +58,9 @@ - (void)dealloc
 	[self discardFramesetter];
 	SYNCHRONIZE_END(self)
 
+#if !OS_OBJECT_USE_OBJC
 	dispatch_release(selfLock);
+#endif
 }
 
 - (NSString *)description

Core/Source/DTHTMLAttributedStringBuilder.m

@@ -83,14 +83,12 @@ - (id)initWithHTML:(NSData *)data options:(NSDictionary *)options documentAttrib
 
 - (void)dealloc
 {
-#if TARGET_API_MAC_OSX
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1080
+#if !OS_OBJECT_USE_OBJC
 	dispatch_release(_stringAssemblyQueue);
 	dispatch_release(_stringAssemblyGroup);
 	dispatch_release(_stringParsingQueue);
 	dispatch_release(_stringParsingGroup);
 #endif
-#endif
 }
 
 - (BOOL)_buildString