Avoided "set but never used" warnings for dummy variable reads

Hi,

I'm looking for tips on how to quiet "set but never used"
warnings so that I can turn on -Werror (so any warnings
produce compilation failures).

I quite often encounter the idiom,

   integer :: nblocks_dum  ! position holder for read

   [..]

   read(8) nblocks_dum, other, useful, data

due to reading files we have no control over.  As we don't
need nblocks_dum, this produces a "set but never used"
warning for nblocks_dum.

Is there a clear way to avoid this warning, or otherwise
cir***vent it?  (I still want to this warning for otherwise
legitmate set-but-never-used cruft.)

Thanks,
--
Bil Kleb
http://fun3d.larc.nasa.gov