How can I tell Clang to ignore `property incompatible with [super class] property type` warning?

Question

I have a super class like this:

@protocol AOCellDelegate;

@interface AOBaseCell : UITableViewCell
@property (nonatomic, weak) id<AOCellDelegate>delegate;
// ... other stuff ...
@end

Where AOCellDelegate is declared in a separate AOCellDelegate.h file (not all controllers will care to be the cell delegate, so I don't want to force them to import it).

I have a subclass of AOBaseCell that looks like this:

@protocol AOTextCellDelegate;

@interface AOTextCell : AOBaseCell
@property (nonatomic, weak) id<AOTextCellDelegate>delegate;
// ... other stuff...
@end

Where AOTextCellDelegate is declared in AOTextCellDelegate.h as conforming to AOCellDelegate like this:

@protocol AOTextCellDelegate <AOCellDelegate>
// ... methods ...
@end

Xcode / Clang incorrectly gives this warning:

property type 'id<AOTextCellDelegate>' is incompatible with type 'id<AOCellDelegate>' inherited from 'AOBaseCell'

It is compatible because AOTextCellDelegate conforms to AOCellDelegate, but Clang can't tell this because AOTextCellDelegate.h isn't imported in AOTextCell.h.

How can I tell Xcode / Clang to ignore this warning on this file only?

Per this other StackOverflow question, I believe that I need to use #pragma to ignore it. However, I don't see a warning identifier specified in the log (just the above message).

Answer 1

I couldn't figure out a way to use #pragma to silence this warning. However, I was able to let Clang know that the subclass delegate property was compatible with the super delegate property by doing the following:

@protcol AOCellDelegate; // technically, not needed because it's imported from super header
@protocol AOTextCellDelegate;

@interface AOTextCell : AOBaseCell
@property (nonatomic, weak) id<AOCellDelegate, AOTextCellDelegate>delegate;
// ... other stuff...
@end