AW: AW: AW: Undefined reference to `__sync_bool_compare_and_swap_4' for some Leon configurations with gfortran

[Sebastian Huber]

On 27/02/17 15:15, Jan.Sommer at dlr.de wrote:
>> -----Ursprüngliche Nachricht-----
>> >Von: Sebastian Huber [mailto:sebastian.huber at embedded-brains.de]
>> >Gesendet: Montag, 27. Februar 2017 15:11
>> >An: Sommer, Jan;devel at rtems.org
>> >Betreff: Re: AW: AW: Undefined reference to
>> >`__sync_bool_compare_and_swap_4' for some Leon configurations with
>> >gfortran
>> >
>> >On 27/02/17 15:08,Jan.Sommer at dlr.de  wrote:
>>> > >Ok, thanks for the clarification.
>>> > >I will try to create a patch for gcc and put rtems CC for the discussion.
>> >
>> >Another option would be to provide the __sync_() stuff also via libatomic.
>> >
> True. I will ask on the gcc mailinglist what they would prefer.
>

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.

-- 
Sebastian Huber, embedded brains GmbH

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