CODEWITHSUNDEEP
iosobjective-cxcodeblock
ProBlc
ProBlc

Reputation: 121

Why is Xcode entering an uncalled funtion breakpoint with __block?

@interface DemoClass()
@property dispatch_queue_t queue;
@end

@implementation DemoClass

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

-(void)notCallFunction
{
    dispatch_async(self.queue, ^{
        __block NSDate *noUse = nil;
        NSLog(@"notCallFunction:%@",noUse);
    });
}

-(void)doSomething
{
    __block NSError *error = nil;
    dispatch_async(self.queue, ^{
        error = nil;//when add this line,notCallFunction can enter "__block NSDate *noUse =     nil" break point
        NSLog(@"doSomething");
    });
}

When I set a breakpoint in __block NSDate *noUse = nil; and call doSomething, Xcode locates the line __block NSDate *noUse = nil.

Upvotes: 0

Views: 58

Answers (1)

BastiBen
BastiBen

Reputation: 19880

I had a similar problem in the past. Turning off compiler optimizations for debug builds (-O0) fixed it for me.

Upvotes: 2

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