On May 3, 2012, at 2:54 PM, Florian Pilz wrote:

> Hi again. I just stumbled about this problem for another time and rethought 
> Ulis explanation. The point of my writing is: Ulis explanation is wrong. The 
> program compiles (with a warning) and runs perfectly fine. So basically Xcode 
> tells me, that it must know the implementation details, which are not given 
> in the header file (but may be added in the implementation file -- therefore 
> a warning rather an error).

Please post your code in its entirety.

I just tried this, and it gives me a warning:

// t.m
#import <Foundation/Foundation.h>

@protocol FooProto;

@interface SomeClass : NSObject <FooProto>
@end

@implementation SomeClass
@end

int main(int argc, char **argv)
{
    [SomeClass new];
    return 0;
}

@protocol FooProto
@end
// END t.m

% clang -o t t.m -framework Foundation
t.m:5:34: warning: cannot find protocol definition for 'FooProto'
1 warning generated.

--Kyle Sluder
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