[Bug libgomp/85129] [openacc] Document GOMP_OPENACC_DIM

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85129

--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> I. trunk
> 
> The GOMP_OPENACC_DIM environment variable is not documented (it should have
> an entry in libgomp.texi at 'OpenACC Environment Variables').

Atm, in trunk, fopenacc-dim does not yet support the '-' syntax, so the only
dimension that GOMP_OPENACC_DIM can influence is gang.

It probably doesn't make any sense to document GOMP_OPENACC_DIM until it's
fully functioning.