[cfe-dev] Obj-C false positive warning with deprecation and instancetype?

[jahanian]

On Jan 11, 2012, at 10:49 AM, jahanian wrote:

> 
> On Jan 11, 2012, at 8:10 AM, Sean McBride wrote:
> 
>> Hi all,
>> 
>> Using clang r147866 on Mac OS X 10.7, the code below causes this warning:
>> 
>> $ clang -fsyntax-only test.m 
>> test.m:18:11: warning: 'initWithContentsOfURL:' is deprecated [-Wdeprecated-declarations]
>>       return [[[self alloc] initWithContentsOfURL:inURL] autorelease];
>>                ^
>> 
>> NSString has a deprecated method initWithContentsOfURL:, but in my own class it's not deprecated.  I would have thought that between my own use of instancetype and clang's special casing of alloc that this should not warn.  Is it a false positive bug?
> 
> It is not false positive. [self alloc] is of type 'id'. Not knowing which initWithContentsOfURL gets called, clang goes out of its way to issue the deprecated warning so user can take action.
> You can make your intention known to clang by type-casting [self alloc].
> 
> - Fariborz


If alloc is using instancetype then you shouldn't see this warning. Please file a bug report with the pre-processed file.

- Fariborz