Re: [Swarm-Support] Link break troubles with a swarm-objc-based application on macosX

[Bill Northcott]

On 20/02/2008, at 9:16 AM, Thomas Louail wrote:
> I'm trying to compile and run on my mac an objc-swarm app that i co- 
> developp, and which compiles and runs perfectly on a linux (debian)  
> machine, with gcc 3-3 and swarm 2-1 installed on it.
> Tiger is running on my mac and i have gcc 4.0.1 installed. I  
> installed the binairies provided on swarm.org (thanks Bill  
> Northcott !), and payed attention to first install all the needed  
> stuff (tcl/tk, hdf, x11 and so on). The installation seems allright,  
> since i can compile and run under X11 the swarmapps provided on the  
> website (conway, mousetrap, etc.)
> ......
> /usr/bin/ld: Undefined symbols:
> _objc_msgSend
> .objc_class_name_ListShuffler_c
..........
> 1) i could compile the swarmapps downloaded in the archive provided  
> on the website, which prooves my swarm install is configured and  
> ready to go. I fig
> 2) this swarm-objc-based-code compiles, links (with gcc 3.4) and  
> runs on a linux machine without difficulties, but doesn't on my mac

It seems from the errors, that you are attempting to link the Apple  
Objective-C runtime instead of the Swarm modified GNU version.  This  
would not arise on Linux because the GNU version is the default.

If the provided examples compile and run while your code has problems  
linking the appropriate runtime, it would appear likely the issue is  
to do with your makefile.

Compare the link line from a build of the examples which work with the  
your link line that fails.  I think you may be missing a -nostdlib  
option.  Unfortunately, I no long have access to a Mac running Tiger  
and my Swarm build system is a bit rotted.  I am hoping to get a  
Leopard binary out in the near future, but that will not help on Tiger  
as it will use the 4 way fat libffi which is part of Leopard.

Bill Northcott