Open Radar

 
24-Jul-2012 09:12 PM Aaron KRAMER:
Summary:

    When assigning a retained object to a weak reference, the `arc-unsafe-retained-assign` warning is thrown, because the object will be released immediately after assignment. But if you assign this retained object to a weak reference *and* a normal reference in the same statement, the warning is stil thrown, even though the object will not be released immediately after assignment.

Steps to Reproduce:

    Compile the following code with Clang with -fobjc-arc set:

        __weak NSObject *weakRef;
        NSObject *normalRef;
        normalRef = weakRef = [[NSObject alloc] init];

Expected Results:

    The code should compile with no warning.

Actual Results:

    The following warning is printed:
        warning: assigning retained object to weak variable; object will be released after assignment [-Warc-unsafe-retained-assign]
            normalRef = weakRef = [[NSObject alloc] init];
                                ^ ~~~~~~~~~~~~~~~~~~~~~~~

Regression:

    The problem does not occur if the normal reference is assigned first, i.e.:

        weakRef = normalRef = [[NSObject alloc] init];