[patch libstdc++] Optimize synchronization in std::future if futexes are available.

[Jonathan Wakely]

On 17/01/15 01:45 -0500, Hans-Peter Nilsson wrote:
>On Fri, 16 Jan 2015, pinskia@gmail.com wrote:
>> > On Jan 16, 2015, at 9:57 PM, David Edelsohn <dje.gcc@gmail.com> wrote:
>> >
>> > This patch has broken bootstrap on AIX
>> >
>> > May I mention that this really should have been tested on systems
>> > other than x86 Linux.
>>
>> It also broke all newlib targets too. So you could have tested one listed in the sim-test web page.
>
>For those interested, PR64638.

Should be fixed in trunk now, by this patch.

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