.. _Compilerflags:

Compiler directives
===================

DG-SWEM has been written in a semi-modular way, in order to preserve performance on when certain features are not active.  As a consequence many compiler directive are used.  The directives can be set in cmplrflg.mk.  Here is a breakdown of the compiler directive options: 

* **DRKSSP**: Indicates that strong stability preserving Runge Kutta will be used for time integration, with stage equal to or exceeding order.

* **DRKC**: Indicates Runge-Kutta-Chebyshev methods will be used for time integration,  with stage equal to or exceeding order.

* **DWETDR**: Turns the wetting and drying algorithm on.

* **DOUT_TEC**: Indicates that tecplot output will be produced relative to the NSPOOL parameters.

* **DSLOPEALL**: This means that all slope limiters will be made available for use.

* **DSLOPE5**: This means only the BDS limiter will be made available for use.

* **DARTDIF**: This means artificial diffusion will be made active.

* **DSED_LAY**: Indicates that layered sediment evolution will be computed.

* **DTRACE**: This means that a tracer field will be active, that is passively advected by the velocity field.

* **DCHEM**: This means that chemistry is turned on.

* **DP0**: Indicates that piecewise constants are available for use.

* **DP_AD**: Means that p-enrichement or p-adaptivity is activated.

* **DSWAN**: Indicates that the nearshore wave model `SWAN <http://swanmodel.sourceforge.net/>`_ will be coupled to the solution.