Compilation and Installation

Procedure

Use PuTTY to log in to the server as the root user.
Run the following commands to create and go to the NEMO installation directory:
```
mkdir -p /path/to/NEMO
cd /path/to/NEMO
```

Run the following commands to configure the NEMO environment variables:

echo "export NETCDF_DIR=/path/to/NETCDF" >> nemo-env.sh
echo "export HDF_DIR=/path/to/HDF5" >> nemo-env.sh
echo "export XIOS_DIR=/path/to/XIOS/xios-1.0" >> nemo-env.sh
source nemo-env.sh

Run the following command to decompress the installation package:
```
unzip NEMO_releases_release-3.6-10083.zip
```
Run the following command to go to the NEMO source code directory:
```
cd NEMO/releases/release-3.6/NEMOGCM
```

Run the following command to create an arch-aarch64_gnu.fcm file:

Create arch-aarch64_gnu.fcm.
```
vi ARCH/arch-aarch64_gnu.fcm
```

Press i to enter the insert mode and add the following content:

#generic gfortran compiler options for linux 
#NCDF_INC    netcdf include file 
#NCDF_LIB    netcdf library 
#FC          Fortran compiler command 
#FCFLAGS     Fortran compiler flags 
#FFLAGS      Fortran 77 compiler flags 
#LD          linker 
#LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a 
#FPPFLAGS    pre-processing flags 
#AR          assembler 
#ARFLAGS     assembler flags 
#MK          make 
#USER_INC    additional include files for the compiler,  e.g. -I<include dir> 
#USER_LIB    additional libraries to pass to the linker, e.g. -l<library> 
#CC          C compiler used to compile conv for AGRIF 
#CFLAGS      compiler flags used with CC 
# 
#Note that: 
# - unix variables "$..." are accpeted and will be evaluated before calling fcm. 
# - fcm variables are starting with a % (and not a $) 
%NCDF_HOME           $NETCDF_DIR
%HDF5_HOME           $HDF_DIR
%XIOS_HOME           $XIOS_DIR

%NCDF_INC            -I%NCDF_HOME/include -I%HDF5_HOME/include
%NCDF_LIB            -L%HDF5_HOME/lib -L/%NCDF_HOME/lib -lnetcdf -lnetcdff
%XIOS_INC            -I%XIOS_HOME/inc
%XIOS_LIB            -L%XIOS_HOME/lib -lxios

%CPP                 cpp -Dkey_nosignedzero
%FC                  mpif90 -c -cpp
%FCFLAGS             -mcpu=native -fdefault-real-8 -fdefault-double-8 -O3 -funroll-all-loops -fcray-pointer -ffree-line-length-none -g
%FFLAGS              %FCFLAGS
%LD                  mpif90
%LDFLAGS             -lstdc++
%FPPFLAGS            -P -C -traditional
%AR                  ar
%ARFLAGS             rs
%MK                  gmake
%USER_INC            %XIOS_INC %NCDF_INC
%USER_LIB            %XIOS_LIB %NCDF_LIB

%CC                  cc
%CFLAGS              -O0

Ensure that no space exists at the end of a line or empty line.

Press Esc, type :wq!, and press Enter to save the file and exit.

Run the following commands to compile and install the software:

chmod 777 ./ -R
cd ./CONFIG/
./makenemo -m aarch64_gnu -j 32 -r AMM12 -n 'MY_AMM12' add_key "key_nosignedzero"

Parent topic: NEMO V3.6 Porting Guide (CentOS 7.6)