On Aug 15, 2011, at 11:19 AM, Martin Hewitson wrote:

> 
> On Aug 15, 2011, at 08:13 PM, David Duncan wrote:
> 
>> On Aug 15, 2011, at 10:56 AM, Martin Hewitson wrote:
>> 
>>> Is it ok to declare a property to be NSPopover, even if that class doesn't 
>>> exist on 10.6? 
>> 
>> Yes. Using a class as a data type doesn't create linkage.
>> 
>>> I tried the 
>>> 
>>> if ([NSPopover class]) {}
>>> 
>>> trick, but I get the same error when running on 10.6.8. I'll try some more 
>>> in case I made a mistake, but….
>> 
>> 
>> But again, are you building with Clang? :).
> 
> No, the project is set to use "System default (LLVM GCC 4.2)". You would 
> rather recommend "Apple LLVM compiler 2.1" ?


You can either use LLVM Compiler (aka Clang, I forget that it was renamed in 
Xcode!) or you can use the NSClassFromString I mentioned earlier. Either will 
solve the problem, but weak linked classes are only supported in LLVM/Clang.
--
David Duncan

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