[LLVMbugs] [Bug 10309] New: Can't override a virtual function and return a more specific ObjC type

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10309

           Summary: Can't override a virtual function and return a more
                    specific ObjC type
           Product: new-bugs
           Version: unspecified
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: alee at mimsoftware.com
                CC: llvmbugs at cs.uiuc.edu


#import <Foundation/Foundation.h>

@interface Test : NSObject
@end

@interface TestX : Test
@end

class Top {
    virtual Test* getTest();
};
class Bottom: public Top {
    virtual TestX* getTest(); //Error generated on this line
};

LLVM outputs the following error: virtual function 'getTest' has a different
return type ('TestX *') than the function it overrides (which has return type
'Test *')

TestX is a subclass of Test in this scenario so there should be no error here
(legitimately narrowing the return type).

Using the Apple LLVM compiler 3.0 in Xcode 4.2 Build 4D58.  It's worth noting
that this same code compiles cleanly under GCC 4.2.

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