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


On 1 July 2014 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.

It should already be defined, but its value is what matters for
libstdc++'s purposes.

To be honest I'm not sure if we really need the value to be greater
than one, if it's equal to one that might work. We'd need to check
though.


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