missing symbols in libstdc++.so.6 built from the 4.9 branch

[Ramana Radhakrishnan]

On 01/07/14 20:58, John David Anglin wrote:
> On 1-Jul-14, at 5:32 AM, Jonathan Wakely wrote:
>
>> On 1 July 2014 09:40, Matthias Klose wrote:
>>> - HPPA (build log [2]), is missing all the future_base symbols and
>>>    exception_ptr13exception symbols, current_exception and
>>>    rethrow_exception.
>>
>> This implies ATOMIC_INT_LOCK_FREE <= 1 for that target. Our future and
>> exception_ptr implementations rely on usable atomics.
>
> ARM and HPPA use kernel assisted libraries for atomic support.  Not
> exactly
> lock free, but possibly good enough...
>
> Currently, c-cppbuiltin.c doesn't provide proper defines for this
> support.  We
> currently define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4, etc, in
> pa-linux.h.  I'll experiment with defining ATOMIC_INT_LOCK_FREE there.

We then need to do the same on ARM especially for older architectures 
that don't have these sync patterns.

Ramana

>
> Thanks,
> Dave
> --
> John David Anglin	dave.anglin@bell.net
>
>
>
>