http://llvm.org/bugs/show_bug.cgi?id=10164
Summary: Issue with objc_method_family(init) in class
extension.
Product: clang
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Frontend
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
When using the objc_method_family(init) attribute in class extension, clang
does not properly infer the return type and emit a diagnostic to tell it
mismatch (whatever you set as return type).
---------- method_family_init.m
@interface Foo {}
@end
@interface Foo()
- (id)myinit __attribute__((objc_method_family(init)));
@end
@implementation Foo
- (id)myinit { return self; }
@end
------------
% clang -c method_family_init.m
method_family_init.m:9:1: warning: method is expected to return an instance of
its class type 'Foo', but is declared to return 'id'
- (id)myinit { return self; }
^ ~~
method_family_init.m:5:1: note: overridden method is part of the 'init' method
family
- (id)myinit __attribute__((objc_method_family(init)));
^
1 warning generated.
Note that setting the return type to (Foo *) will not solve the issue as clang
expect 'Foo' and not 'Foo *', which is meaningless in Obj-C.
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