objc_subclassing_restricted ob both parent and child classes gives no error.

Originator:zienag
Number:rdar://28753587 Date Originated:13-Oct-2016 04:08 PM
Status:Closed Resolved:No
Product:Developer Tools Product Version:8.0
Classification: Reproducible:Yes
 
Summary:
If you add objc_subclassing_restricted attribute to both parent and child classes it compiles without any error. So attribute appears to be useless, as you can't rely on it.

Steps to Reproduce:
Code to reproduce bug:

#import <Foundation/Foundation.h>

#define FINAL __attribute__((objc_subclassing_restricted))

FINAL
@interface Parent : NSObject
@end
@implementation Parent
@end

FINAL
@interface Child : Parent
@end
@implementation Child
@end

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

Expected Results:
Compile time error.

Actual Results:
Compiles without errors

Version:
Xcode Version 8.0 (8A218a)

OS X El Capitan 10.11.6 (15G1004)

Notes:


Configuration:
$ clang --version
Apple LLVM version 8.0.0 (clang-800.0.38)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Attachments:

Comments

This issue seems resolved in Xcode 8.3.

By zienag at April 1, 2017, 6:44 a.m. (reply...)

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