#!/bin/bash
#
#  $Header: /u/gcmpack/MITgcm/tools/build_options/linux_ia32_gfortran,v 1.12 2013/07/22 18:40:45 jmc Exp $
#  $Name:  $
#

#  Tested with gcc-gfortran v4.1.1 on FC5, FC6, FC8, using flags
#              formally for gcc-gfortran 4.3*
#       + with gcc-gfortran v4.3.0 on FC9

#-------
# 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 -m32}
  FC=${FC:=mpif77 -m32}
  F90C=${F90C:=mpif90 -m32}
else
  CC=gcc
  FC=gfortran
  F90C=gfortran
fi

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

NOOPTFLAGS='-O0'
NOOPTFILES=''

has_sse2=f
grep flags /proc/cpuinfo | grep sse2 > /dev/null 2>&1  &&  has_sse2=t

# Requires gfortran from 2006 onwards for -fconvert=big-endian
FFLAGS="$FFLAGS -fconvert=big-endian -fimplicit-none"
#- otherwise, switch to the home-made byte-swap:
#DEFINES="-D_BYTESWAPIO $DEFINES"

if test "x$IEEE" = x ; then     #- with optimisation:
    FOPTIM='-O3 -funroll-loops'
   #if test "x$has_sse2" = xt ; then
   #    FOPTIM="$FOPTIM -ftree-vectorize -msse -msse2"  # <-- from optfile gfortran4.4
   #fi
else
  if test "x$DEVEL" = x ; then  #- no optimisation + IEEE :
    if test "x$has_sse2" = xt ; then
        FOPTIM='-O0 -mfpmath=sse -msse -msse2'
    else
        FOPTIM='-O0 -ffloat-store'
    fi
  else                          #- development/check options:
    FOPTIM='-O0 -ffloat-store'
    FOPTIM="$FOPTIM -g -ffpe-trap=invalid,zero,overflow -fbounds-check"
  fi
fi
#  version 4.3.0 has problems with option "-malign-double" ;
#  may want to put it back with older/newer version (when it works)
#FOPTIM="$FOPTIM -malign-double"
F90FLAGS=$FFLAGS
F90OPTIM=$FOPTIM
CFLAGS='-O0'

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

if [ "x$NETCDF_ROOT" != x ] ; then
    INCLUDEDIR="${NETCDF_ROOT}/include"
    INCLUDES="-I${NETCDF_ROOT}/include"
    LIBDIR="${NETCDF_ROOT}/lib"
    LIBS="-L${NETCDF_ROOT}/lib"
elif [ "x$NETCDF_HOME" != x ]; then
    INCLUDEDIR="${NETCDF_HOME}/include"
    INCLUDES="-I${NETCDF_HOME}/include"
    LIBDIR="${NETCDF_HOME}/lib"
    LIBS="-L${NETCDF_HOME}/lib"
elif [ "x$NETCDF_INC" != x -a "x$NETCDF_LIB" != x ]; then
    NETCDF_INC=`echo $NETCDF_INC | sed 's/-I//g'`
    NETCDF_LIB=`echo $NETCDF_LIB | sed 's/-L//g'`
    INCLUDEDIR="${NETCDF_INC}"
    INCLUDES="-I${NETCDF_INC}"
    LIBDIR="${NETCDF_LIB}"
    LIBS="-L${NETCDF_LIB}"
elif [ "x$NETCDF_INCDIR" != x -a "x$NETCDF_LIBDIR" != x ]; then
    INCLUDEDIR="${NETCDF_INCDIR}"
    INCLUDES="-I${NETCDF_INCDIR}"
    LIBDIR="${NETCDF_LIBDIR}"
    LIBS="-L${NETCDF_LIBDIR}"
elif test -d /usr/include/netcdf-3 ; then
    INCLUDES='-I/usr/include/netcdf-3'
    LIBS='-L/usr/lib/netcdf-3'
elif test -d /usr/include/netcdf ; then
    INCLUDES='-I/usr/include/netcdf'
elif test -d /usr/local/netcdf ; then
    INCLUDES='-I/usr/local/netcdf/include'
    LIBS='-L/usr/local/netcdf/lib'
elif test -d /usr/local/include/netcdf.inc ; then
    INCLUDES='-I/usr/local/include'
    LIBS='-L/usr/local/lib'
fi

if [ -n "$MPI_INC_DIR" -a "x$MPI" = xtrue ] ; then
    INCLUDES="$INCLUDES -I$MPI_INC_DIR"
    INCLUDEDIRS="$INCLUDEDIRS $MPI_INC_DIR"
    #- used for parallel (MPI) DIVA
    MPIINCLUDEDIR="$MPI_INC_DIR"
   #MPI_HEADER_FILES='mpif.h mpiof.h'
fi