Open Radar

 
UPDATE: Closed as Duplicate of 20335433

Summary:
Xcode's Build and Analyze generates a spurious over-release warning in an object's -dealloc method when dispatch_release() is called for the ivar backing an assign dispatch_queue_t property.

Steps to Reproduce:
1. Create an iOS app project in Xcode
2. Load the attached files into the project
3. Ensure that DispatchQueueContainer.m is built without ARC
4. Run Build and Analyze

Expected Results:
No warnings are produced for DispatchQueueContainer

Actual Results:
"Incorrect decrement of the reference count of an object that is not owned at this point by the caller" warning is produced.

Version:
OS X 10.10.3 (14D131), Xcode 6.4 (6E7)

Notes:


Configuration:
This issue is present in Xcode 6.3 and Xcode 6.4 beta, and is not present in Xcode 6.2

Attached Files:

// DispatchQueueContainer.h

#import <UIKit/UIKit.h>

@interface DispatchQueueContainer : UIView

@end

---

// DispatchQueueContainer.m

#import "DispatchQueueContainer.h"

@interface DispatchQueueContainer ()

@property (nonatomic, assign) dispatch_queue_t queue;

@end

@implementation DispatchQueueContainer

- (instancetype)init {
    self = [super init];
    if (self) {
        _queue = dispatch_queue_create("Test queue", DISPATCH_QUEUE_SERIAL);
    }
    return self;
}

- (void)dealloc {
    dispatch_release(_queue);
    
    [super dealloc];
}

@end