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Re: __sync_-builtins cause undefined references on some sparc targets
- From: Eric Botcazou <ebotcazou at libertysurf dot fr>
- To: Jan dot Sommer at dlr dot de
- Cc: gcc at gcc dot gnu dot org, devel at rtems dot org
- Date: Mon, 27 Feb 2017 22:07:56 +0100
- Subject: Re: __sync_-builtins cause undefined references on some sparc targets
- Authentication-results: sourceware.org; auth=none
- References: <DE6CFD2ED4BCD440A2DE18E253A8FDF45A376F@DLREXMBX01.intra.dlr.de>
> "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.
--
Eric Botcazou