Re: Multiple declarations of objc_msgSend_stret
Re: Multiple declarations of objc_msgSend_stret
- Subject: Re: Multiple declarations of objc_msgSend_stret
- From: Jean-Daniel Dupas <email@hidden>
- Date: Fri, 4 Feb 2011 09:54:37 +0100
I don't know what the status of this feature in the last Xcode version, but clang supports the unused attribute on obj-c ivar.
I have something like this to workaround this kind of warning:
#if __has_feature(attribute_objc_ivar_unused)
#define UNUSED_IVAR __attribute__((unused))
#else
#define UNUSED_IVAR
#endif
and then
@interface Foo {
int ivar UNUSED_IVAR;
}
@end
Le 4 févr. 2011 à 00:59, James Bucanek a écrit :
> Hamish Allan <mailto:email@hidden> wrote (Thursday, February 3, 2011 4:05 PM -0000):
>
>> On 3 February 2011 22:46, James Bucanek <email@hidden> wrote:
>>
>>> I have numerous instance variables which are
>>> only used by categories.
>>
>> If you compile using -Xclang -fobjc-nonfragile-abi2, you can declare
>> instance variables in class extensions and kill two birds (improve
>> locality of reference, remove warnings) with one stone.
>
> I thought non-fragile instance variables required 64-bit Intel and/or 10.5.
>
> I still have to compile for 32-bit, PPC, and (occasionally) OS 10.4, so moving my instance variables into categories doesn't seem practical at this point in time.
>
>
>
> James Bucanek
> ____________________________________________________________________
> Author of Professional Xcode 3 ISBN: 9780470525227
> <http://www.proxcode3.com/>
> and Learn Objective-C for Java Developers ISBN: 9781430223696
> <http://objectivec4java.com/>
>
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-- Jean-Daniel
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