__sync_-builtins cause undefined references on some sparc targets

[Jan Sommer]

On Montag, 27. Februar 2017 22:07:56 CET Eric Botcazou wrote:
> > "This __sync_() stuff seems to be used in several places in GCC. So,
> > changing libbacktrace is probably not enough. We need a general solution
> > for the __sync_() builtins on RTEMS. I don't think GCC can be changed to
> > emit __atomic_() calls for the __sync_() builtins (I would still try to
> > ask). The libgcc or libatomic is probably a good place to add them for
> > RTEMS as functions implemented via __atomic_() builtins."
> > 
> > Could someone give me some recommendations on what would be the best
> > solution to fix the problem and maybe some pointers on how to start?
> 
> I'm not sure backtrace support has much interest on embedded platforms and I 
> don't think implementing atomic operations makes any sense on LEON2, so the 
> best thing to do is probably to kludge around it in libgfortran.
> 

Is there an easy way to remove the libbacktrace dependency?
Might something like that work?: https://patchwork.ozlabs.org/patch/553017/