AddGMPFlags
-----------

Helpers for using `GMP <https://gmplib.org>`_ from DUNE targets.

.. cmake:command:: add_dune_gmp_flags

  Link the given targets against ``GMP::gmpxx`` and add the compile
  definition ``HAVE_GMP=1``.

  The command has an effect only when ``GMP_FOUND`` is true.

  .. code-block:: cmake

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

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