#!/bin/bash

#  $Header: /u/gcmpack/MITgcm/tools/build_options/linux_amd64_gfortran,v 1.19 2012/07/02 16:39:59 heimbach Exp $
#  $Name: checkpoint63s $

# Build options for gfortran compiler (GNU) on Linux AMD64 platform
#
#  Tested with gcc-gfortran v4.1.x as shipped with Fedora Core 6,7,8
#         with gcc-gfortran v4.3.x as shipped with Fedora Core 9,10
#
# OpenMP : Tested on dickens with gcc-gfortran v4.3.2 as shipped with FC 10
#              on baudelaire with gcc-gfortran v4.4.5 as shipped with FC 13
#              on danton     with gcc-gfortran v4.5.1 as shipped with FC 14
#              on acesgrid   with gcc-gfortran v4.6.0 as shipped with FC 15
#
# MPI : Tested on acesgrid (Fedora Core 15), using:
#       module load gcc     (Version 4.6.0)
#   and with mpich1:
#       module load mvapich
#   or  with mpich2:
#       module load mvapich2
#   or  with openmpi:
#       module load openmpi
# and on baudelaire.csail.mit.edu (FC13), using:
#       export MPI_GCC_DIR=/srv/software/gcc/gcc-packages/gcc-4.4.5/mpich2/mpich2-1.3
#       export MPI_INC_DIR=$MPI_GCC_DIR/include
#       export PATH=$MPI_GCC_DIR/bin:$PATH
#
# and on IRIDIS at Southampton
# http://www.southampton.ac.uk/isolutions/computing/hpc/iridis/
#    with
#       module load openmpi/1.4.3/gcc-4.3.3
#    and
#       export MPI_INC_DIR=$MPIROOT/include

#-------
# run with OpenMP: needs to set environment var. OMP_NUM_THREADS
#    and generally, needs to increase the thread stack-size:
#   -  sh,bash:
#     > export OMP_NUM_THREADS=2
#     > export GOMP_STACKSIZE=400m
#   - csh,tcsh:
#     > setenv OMP_NUM_THREADS 2
#     > setenv GOMP_STACKSIZE 400m
#-------
if test "x$MPI" = xtrue ; then
  CC=${CC:=mpicc}
  FC=${FC:=mpif77}
  F90C=${F90C:=mpif90}
else
  CC=gcc
  FC=gfortran
  F90C=gfortran
fi

DEFINES='-DWORDLENGTH=4 -DNML_TERMINATOR'
CPP='cpp -traditional -P'
EXTENDED_SRC_FLAG='-ffixed-line-length-132'
F90FIXEDFORMAT='-ffixed-form'
GET_FC_VERSION="--version"
OMPFLAG='-fopenmp'

NOOPTFLAGS='-O0'
NOOPTFILES=''

# Requires gfortran from 2006 onwards for -fconvert=big-endian
FFLAGS="$FFLAGS -fconvert=big-endian -fimplicit-none"
# for big objects:
FFLAGS="$FFLAGS -fPIC"
#- might want to use '-fdefault-real-8' for fizhi pkg:
#FFLAGS="$FFLAGS -fdefault-real-8 -fdefault-double-8"

if test "x$IEEE" = x ; then     #- with optimisation:
   #- full optimisation
    FOPTIM='-O3 -funroll-loops'
    NOOPTFILES="$NOOPTFILES ini_masks_etc.F"
   #- can use -O2 (safe optimisation) to avoid Pb with some gcc version of -O3:
   #FOPTIM='-O2 -funroll-loops'
else
   # these may also be useful, but require specific gfortran versions:
   # -Wnonstd-intrinsics  for gfortran <= 4.3
   # -Wintrinsics-std     for gfortran >= 4.4
   # -Wno-tabs            for gfortran >= 4.3
    FFLAGS="$FFLAGS -Waliasing -Wampersand -Wsurprising -Wline-truncation"
   #- to get plenty of warnings: -Wall -Wextra (older form: -Wall -W) or:
   #FFLAGS="$FFLAGS -Wconversion -Wimplicit-interface -Wunused-labels"
if test "x$DEVEL" = x ; then  #- no optimisation + IEEE :
    FOPTIM='-O0'
  else                          #- development/check options:
    FOPTIM='-O0 -g -fbounds-check'
    FOPTIM="$FOPTIM -ffpe-trap=invalid,zero,overflow -finit-real=inf"
  fi
fi

F90FLAGS=$FFLAGS
F90OPTIM=$FOPTIM
CFLAGS='-O0 -fPIC'

INCLUDEDIRS=''
INCLUDES=''
LIBS=''


if [ "x$NETCDF" != x ] ; then
    INCLUDEDIR="$NETCDF/include"
    INCLUDES="-I$NETCDF/include"
    LIBDIR="$NETCDF/lib"
    LIBS="-L$NETCDF/lib"
fi

if [ -n "$MPI_INC_DIR" -a "x$MPI" = xtrue ] ; then
    INCLUDES="$INCLUDES -I$MPI_INC_DIR"
    INCLUDEDIRS="$INCLUDEDIRS $MPI_INC_DIR"
    MPIINCLUDEDIR="$MPI_INC_DIR"

fi