OK, problem solved, sort of. Using NSClassFromString makes it work on both
systems. I think I prefer this solution rather than hacking the headers.
Many thanks to all who helped!
Martin
On Aug 15, 2011, at 08:31 PM, Greg Parker wrote:
> On Aug 15, 2011, at 10:50 AM, David Duncan wrote:
>> On Aug 15, 2011, at 10:47 AM, Kyle Sluder wrote:
>>> On Mon, Aug 15, 2011 at 10:45 AM, David Duncan <david.dun...@apple.com>
>>> wrote:
>>>> In either case, the best general way to determine availability of
>>>> weak-linked implementations is to test for them directly rather than using
>>>> a system version check (like gestalt). If your using Clang (which I
>>>> suspect you are not given your error) you could just use:
>>>>
>>>> "if ([NSPopover class]) { /* do stuff with popovers */ } else { /* do
>>>> stuff without */ }"
>>>
>>> Is it the case that this check will only work on 10.6.8 or newer, and
>>> that one should fall back on NSClassFromString() if supporting an
>>> older version of Snow Leopard?
>>
>> I'd actually forgotten that this required 10.6.8. If you can require 10.6.8,
>> I would use the new style universally. If you cannot I would use the
>> NSClassFromString style until you can.
>
> There's a bug here. The Objective-C runtime on 10.6.8 supports weak-linked
> classes, but the NS_CLASS_AVAILABLE macro does not know that.
>
> You can fix this if you are willing to hack your SDK headers. In
> Foundation/NSObjCRuntime.h, find the macro definition of NS_CLASS_AVAILABLE,
> and remove the check for __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_7.
>
>
> --
> Greg Parker gpar...@apple.com Runtime Wrangler
>
>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Martin Hewitson
Albert-Einstein-Institut
Max-Planck-Institut fuer
Gravitationsphysik und Universitaet Hannover
Callinstr. 38, 30167 Hannover, Germany
Tel: +49-511-762-17121, Fax: +49-511-762-5861
E-Mail: martin.hewit...@aei.mpg.de
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