AddPTScotchFlags
----------------

Helpers for using `PTScotch <https://gitlab.inria.fr/scotch/scotch>`_ from
DUNE targets.

.. cmake:command:: add_dune_ptscotch_flags

  Link the given targets against the imported PTScotch targets and add the
  corresponding compile definitions.

  The command links ``PTScotch::Scotch`` when the sequential Scotch library is
  available and ``PTScotch::PTScotch`` when the parallel PTScotch library is
  available.

  .. code-block:: cmake

    add_dune_ptscotch_flags(<target> [<target>...])

  ``targets``
    One or more existing targets to configure.