[gomp4] don't error on implicitly private induction variables in gfortran

[Jakub Jelinek]

On Fri, Jan 27, 2017 at 07:02:45AM -0800, Cesar Philippidis wrote:
> While experimenting with some new OpenACC benchmarks, I noticed that
> gfortran errors when the user explicitly marks loop induction variables
> as private. I applied this patch to gomp-4_0-branch to resolve that problem.
> 
> Cesar

> 2017-01-26  Cesar Philippidis  <cesar@codesourcery.com>
> 
> 	gcc/fortran/
> 	* openmp.c (gfc_resolve_oacc_blocks): Populate list of private
> 	variables.
> 
> 	gcc/testsuite/
> 	* gfortran.dg/goacc/implicitly-private.f90: New test.
> 
> 
> diff --git a/gcc/fortran/openmp.c b/gcc/fortran/openmp.c
> index 61940d7..2782a8d 100644
> --- a/gcc/fortran/openmp.c
> +++ b/gcc/fortran/openmp.c
> @@ -5192,7 +5192,8 @@ gfc_resolve_oacc_blocks (gfc_code *code, gfc_namespace *ns)
>  {
>    fortran_omp_context ctx;
>    oacc_function dims = OACC_FUNCTION_NONE;
> -
> +  gfc_omp_namelist *n;
> +  
>    resolve_oacc_loop_blocks (code);
>  
>    ctx.code = code;
> @@ -5217,6 +5218,10 @@ gfc_resolve_oacc_blocks (gfc_code *code, gfc_namespace *ns)
>    ctx.dims = dims;
>    omp_current_ctx = &ctx;
>  
> +  if (code->ext.omp_clauses)
> +    for (n = code->ext.omp_clauses->lists[OMP_LIST_PRIVATE]; n; n = n->next)
> +      ctx.private_iterators->add (n->sym);

Do you really want to add to private_iterators even variables that aren't
iterators, just arbitrary private variable?

	Jakub