On 12/02/2015 11:35 AM, Jakub Jelinek wrote:
> On Wed, Dec 02, 2015 at 11:16:10AM -0800, Cesar Philippidis wrote:
>>> --- gcc/testsuite/gfortran.dg/goacc/coarray_2.f90
>>> +++ gcc/testsuite/gfortran.dg/goacc/coarray_2.f90
>>> @@ -3,6 +3,7 @@
>>> !
>>> ! PR fortran/63861
>>> ! { dg-xfail-if "<http://gcc.gnu.org/PR63861>" { *-*-* } }
>>> +! { dg-excess-errors "TODO" }
>>
>> This host_data patch exposed a bug in the fortran front end where it was
>> allowing arrays to be used as reduction variables. If replace you
>> replace codimension with dimension, you'd see a similar ICE. The
>> attached patch, while it doesn't make any attempt to fix the gimplifier
>> changes, does teach the fortran front end to error on acc reductions
>> containing array variables.
>
> Does the OpenACC standard disallow array reductions?
> Just asking, because OpenMP allows them (up to 4.0 only in Fortran,
> in 4.5 also C/C++ array sections are allowed).
>
> If the OpenACC standard disallows them, then it is desirable to reject them
> and the patch is ok, otherwise you should try harder to support them ;).
Array reductions aren't supported in OpenACC 2.0.
Cesar
