Your patch fixes the issues. In attachment patch, test case and changelog.

Thanks!

2015-12-07 11:06 GMT+01:00 Tobias Burnus <tobias.burnus@physik.fu-berlin.de>:
> I wrote:
>> I wonder whether using
>>
>> __asm__ __volatile__ ("":::"memory");
>>
>> would be sufficient as it has a way lower overhead than
>> __sync_synchronize().
>
> Namely, something like the attached patch.
>
> Regarding the original patch submission: Is there a reason that you didn't
> include the test case of Deepak from https://gcc.gnu.org/ml/fortran/2015-04/msg00062.html
> It should work as -fcoarray=lib -lcaf_single "dg-do run" test.
>
> Tobias