Re: Quick syntax/compatibility question with libobjc2 and clang 3.4+

[Kevin Ingwersen]

The class isa is not defined, that I am pretty sure. But did you define retainCount in your @interface too? I am reading this on a phone, by the way.

But from what I know in general is, that OS X uses a more modern version of libobjc2 than the one gnustep ships. Not a big surprise, Apple hasn’t put many open source updates so far, and if I am not mistaken, the version that gnustep relies on is even older than 10.7 Lion.

Then again, I purely work on OS X…so i could be all wrong too.

Am 29.04.2014 um 05:32 schrieb Tom Bruno <thomas.bruno@me.com>:

I'm currently using libobjc2 and clang 3.4.  I was researching how NSObject is implemented just learning the ins and outs (I'm very interested in the memory management and such).

One of the things I've noticed is that placing variables in @implementation does not work on linux but seems to work fine on osx like this (Sources at end of email):

#import <objc/runtime.h>

@implementation MAObject {
    Class isa;
    volatile int32_t retainCount;
}

The compiler complains isa and retainCount do not exist.  I've kindof put together that only OSX 64bit mode will work with this code.  Is this a limitation in libobjc2 or clang on linux itself?  Is there something we can do to support this new syntax?

  Tom

Sources: 

https://www.mikeash.com/pyblog/friday-qa-2013-01-25-lets-build-nsobject.html

https://github.com/mikeash/MAObject/blob/master/MAObject.h

https://github.com/mikeash/MAObject/blob/master/MAObject.m

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