Re: Linking frameworks does not work

[Wolfgang Lux]

> Am 02.05.2018 um 15:45 schrieb Andreas Höschler <ahoesch@smartsoft.de>:
> 
> Hi Wolfgang,
> 
>> On 2. May 2018, at 15:36, Wolfgang Lux <wolfgang.lux@gmail.com> wrote:
>> 
>> Selectors do not count here. They are only resolved at runtime not a link 
>> time.
>> You would need an explicit reference to a class, function or global variable 
>> from your frameworks inside the code of the test application to have the 
>> linker include those libraries in the executable.
> 
> int main (int argc, const char **argv, char** env)
>   {
>    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
>    
>    [NSApplication sharedApplication];
>    
>    controller = [[Controller  alloc] init];
>    NSLog(@"controller %@", controller);
>    [NSApp setDelegate:controller];
>    
>    [NSString stringByChaining:@"ass" count:3];
> 
> ...
> 
>    [pool release];
> 
>    return NSApplicationMain (argc, argv);
> }
> 
> Is this directly enough?

No.

> The method NSString::stringByChaining:count:] is defined/implemented in my 
> SRFoundation framework.

True. But when looking for a reference to resolve the NSString class, the 
linker is stubbornly looking for the class definition itself (which is found in 
gnustep-base) and not for any categories defined for that class. Indeed it can 
be fairly painful to get categories linked from frameworks/libraries into an 
executable. You really need a class implementation and not a category (or a 
global variable or function) to enforce linking.

Wolfgang