Re: weak linking questions
Re: weak linking questions
- Subject: Re: weak linking questions
- From: Aurélien Hugelé <email@hidden>
- Date: Wed, 26 May 2004 01:09:30 +0200
On 25 May 2004, at 23:46, Aurilien Hugeli wrote:
hi list !
i would like to add some details i think i have understood now...
i've succeeded to make my application jaguar compatible using the weak
linking feature. The app ran on jaguar perfectly.
I don't know what did i changed, or what did i misunderstood because
now it does not work anymore on jaguar, saying that NSMutableIndexSet
is not in Cocoa (this class is panther only...)
all my project/targets are correctly set to "Mac OS X deployment target
: 10.2", in deployment, and i can see this setting/flag in the build
log...
i have checked using nm -mg and ALL my symbols are hard linked :(
i've of course cleaned everything... no way
so here is my question, because i feel i misunderstood something :
if i implement something like this :
NSMutableIndexSet *aSet = [[NSMutableIndexSet alloc] init];
AND is in deployment target 10.2 AND is in deployment build, any call
to a weak symbol on jaguar should return NULL ok ?
so NSMutableIndexSet *aSet = [[NSMutableIndexSet alloc] init]; should
do "nothing" (but should not crash !)
am i wrong ?
this is were i think the problem is... in fact the weak linking do not
work as i expect : it works for simple C function or C object type, but
it does not work for ObjC classes ... am i wrong on this point ? weak
linking does not work for "complex" objC selector... that's why
NSMutableIndexSet *aSet = [[NSMutableIndexSet alloc] init] is not weak
linked ???
i basically found a hack on cocoa-faq, but i insist on the fact that i
DID NOT NEED this hack about 6h ago, when weak linking seemed to work
!!!
the hack is :
Class mutableIndexSetClass = NSClassFromString(@"NSMutableIndexSet");
id indexesSet = [mutableIndexSetClass indexSet];
it basically works... the app launch on jaguar... and now i have
exception like this :
[NSScrollView setAutohidesScrollers:] selector not recognized... of
course i know it is panther only, but should n't it do nothing since
setAutohidesScrollers should be NULL because of weak linking ?
[read addtions above]
What may have i done to break weak linking (i'm pretty sure i did not
modify anything in my project/targets setting)
is there a bug with weak linking ??
thanks a lot for any help of people that master weak linking :D
so *must* i use the hack described above ? must i *always* use
respondsToSelector: when using 10.3 selector of 10.3 objects ?
(of course i already use respondsToSelector with 10.3 selector on
*10.2* objects) ?
thanks !
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