Future atomic operation cleanup

[Chris Metcalf]

On 8/29/2014 9:32 AM, Adhemerval Zanella wrote:
> On 29-08-2014 10:27, Torvald Riegel wrote:
>> *If* we can make 4.7 a requirement, then I'm certainly all for using
>> just the builtins on architectures where they are available and get
>> inlined.
>>
> And that is exactly what I am asking: are we willing to raise GCC requirements
> for 2.21?  If we will, I see no issue on rework the patch to use GCC builtins.
> If we won't, I see to no point in trying to adjust this patch to use conditionally
> the GCC builtins for GCC 4.7+.

It seems a little too early still, in my opinion.  For example, RHEL 7 was
only officially released a couple of months ago, and RHEL 6 was gcc 4.4, so
Perhaps it's worth adding some mechanism to enable it for testing or
whatever (e.g. configure with --use-atomic-builtins) in the meanwhile.

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com