> On 12 Feb 2015, at 15:19, Jens Alfke <[email protected]> wrote:
> 
> I’m starting to add the new Objective-C nullability indicators (nullable, 
> nonnull, #pragma clang assume_nonnull, etc.) to my framework's headers. But 
> how can I do so in a backward-compatible way, so that clients building with 
> earlier versions of Xcode can use the headers without errors?
> 
> I’m guessing there’s a Clang __has_feature(…) parameter that can be used to 
> test for this, but it’s not mentioned in the release notes. Anyone know what 
> it might be?
> 
> —Jens
> _______________________________________________

I’m guessing it’s

__has_feature( nullability )

from diffing strings in the two versions of clang. 


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