Re: [OpenACC 0/7] host_data construct

[Jakub Jelinek <jakub@redhat.com>]

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 ;).

	Jakub