3.2.2. Building JULES using make

The Makefile supplied with the JULES code should be compliant with most versions of make, but is only guaranteed to work with GNU Make.

The JULES Makefile uses architecture- and compiler-specific variables that must be set by the user to the appropriate values for their system. Architecture-specific variables, such as the remove command and archiving utility to use, are specified in Makefile.common.mk. Compiler-specific variables are given in files named Makefile.comp.*. These files are provided for a number of common compilers, e.g. Makefile.comp.gfortran. To use a compiler for which a file has not been provided, the user should replace the @@ strings in the blank compiler file Makefile.comp.misc with values appropriate to their compiler.

Once the Makefile is set up for the user’s system, JULES is built by issuing a make command at the command prompt while in the directory containing the Makefile. The user must specify some options to make that will determine how JULES is built - valid values for these options are given below, and additional information is given in the comments at the head of the Makefile.

Running make will produce a JULES executable (either jules.exe, jules_debug.exe or jules_fast.exe depending on the value of BUILD) in the JULES root directory, i.e. the directory containing Makefile, src, etc. Options that can be passed to make when building JULES


Determines which version of Makefile.comp.* to use for compiler specific options.

Permitted values Purpose
gfortran Use options for the GNU Fortran compiler.
intel Use options for the Intel Fortran compiler.
nag Use options for the NAGWare compiler.
pgf Use options for the Portland Group compiler.
g95 Use options for the G95 compiler.
sun Use options for the Oracle (previously Sun) Studio compiler.
misc Use options for an unsupported compiler.

Allows different compiler flags to be used without changing the Makefile s.

Permitted values Purpose
run Default. Compile JULES normally.
debug Switch on compiler debug flags.
fast Switch on compiler optimisation flags for faster execution.

Determines whether to use a ‘real’ NetCDF library or the dummy NetCDF library provided with JULES.

Permitted values Purpose
true Use the dummy NetCDF library provided with JULES.
false Default. Use a ‘real’ NetCDF library.


Only used if CDFDUMMY=false.

The NetCDF library path (see JULES and NetCDF).



Only used if CDFDUMMY=false.

The NetCDF include path (see JULES and NetCDF). Example make commands

To create a normal JULES executable without NetCDF using the GFortran compiler:

make COMPILER=gfortran BUILD=run CDFDUMMY=true

To create a fast JULES executable with the Intel compiler using a NetCDF library:

make COMPILER=intel BUILD=fast CDF_LIB_PATH=/path/to/netcdf/lib CDF_MOD_PATH=/path/to/netcdf/include