From: Rob Desbois (rob.desbois_at_[hidden])
Date: 2008-04-04 09:31:32
On Thu, Apr 3, 2008 at 6:42 PM, Peter Dimov <pdimov_at_[hidden]> wrote:
> > I cannot link against Boost libraries 1.35.0 built with CodeSourcery's
> > ARM/GNU toolchain, although the build is successful.
> ...
>
>
> > undefined reference to `__sync_fetch_and_add_4'
> > collect2: ld returned 1 exit status
> >
> > With assistance on the boost-build list I've ascertained that the
> > problem is that GCC doesn't support __sync_fetch_and_add and the other
> > atomic built-ins on ARM.
> > An additional case for this may need to be added to
> > boost/detail/sp_counted_base.hpp
> >
> > I don't know enough to patch boost for this, short-term or otherwise;
> > can anyone offer any advice?
>
> Two workarounds are available: define BOOST_SP_DISABLE_THREADS to disable
> MT-safety for the reference count, or define BOOST_SP_USE_PTHREADS to use a
> pthread_mutex.
Thanks Peter that compiles now.