> On Sep 20, 2016, at 2:47 PM, Sean McBride <s...@rogue-research.com> wrote:
> On Tue, 20 Sep 2016 14:26:27 -0700, David Duncan said:
>>> On Sep 20, 2016, at 1:21 PM, Sean McBride <s...@rogue-research.com> wrote:
>>> Hi all,
>>> WWDC 2016 Session 203 "What's New in Cocoa" at around 43:37 in the
>> video, says that if you link against the 10.11 SDK that NSTableView's
>> delegate is weak.  So I went and wrapped my delegate nil-ing in:
>>>     [tableView setDelegate:nil];
>>>     [tableView setDataSource:nil];
>>> #endif
>>> yet (with NSZombie especially), I easily reproduce message-to-zombie
>> crashes with builds that are made against the Xcode 7.3.1 10.11 SDK.
>> On which OS version?
> At runtime: 10.9.5, 10.10.5, and 10.11.6.
>> The macro above only says “do this if I link against an SDK prior to
>> 10.11” – that doesn’t handle what happens at runtime when you are on
>> 10.10 or below. In particular, if you plan to deploy back to prior to
>> 10.11, then you would want to either do a runtime check, or for trivial
>> code like this always run the code until your MIN_ALLOWED (deployment
>> target) is >= 10.11.
> Yes, I'm aware of these differences.  I'm also aware, as you surely are, that 
> sometimes behaviour depends (only) on what SDK you link against.

Sure, but that generally only applies to that OS or later, as we cannot 
generally change the behavior of older OSes (there are specific recent 
exceptions to that, but they are typically fairly low level and targeted). I 
don’t think the speaker here was trying to imply that this feature was 
available prior to 10.11.

> Besides, I both build and run on 10.11.6 and yet I see these 
> message-to-zombie crashes after removing the setDelegate:nil code.

Thats pretty much what I was trying to verify, and so this sounds like this is 
a bug somewhere. I would highly recommend filing it.
David Duncan


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