#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2016-2020 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     makeFFTW
#
# Description
#     Build script for FFTW
#
# ----------------------------------------------
# NO USER-CONFIGURABLE SETTINGS WITHIN THIS FILE
#------------------------------------------------------------------------------
# Dynamic library ending (default is .so)
[ "$(uname -s)" = Darwin ] && EXT_SO=.dylib || EXT_SO=.so

# Short-circuit test for an installation
if [ "$1" = "-test" ]
then
    [ "$#" -eq 2 ] || { echo "${0##*/} -test : needs 1 argument"; exit 1; }
    dir="${2%/}" # <- FFTW_ARCH_PATH
    if [ -d "$dir/include" -a -r "$dir/lib$WM_COMPILER_LIB_ARCH/libfftw3$EXT_SO" ]
    then
        echo "    fftw include: $dir/include"
        echo "    fftw library: $dir/lib$WM_COMPILER_LIB_ARCH"
        exit 0
    else
        exit 2
    fi
fi
#------------------------------------------------------------------------------
# Run from third-party directory only
cd "${0%/*}" || exit
wmakeCheckPwd "$WM_THIRD_PARTY_DIR" 2>/dev/null || {
    echo "Error (${0##*/}) : not located in \$WM_THIRD_PARTY_DIR"
    echo "    Check your OpenFOAM environment and installation"
    exit 1
}
. etc/tools/ThirdPartyFunctions
#------------------------------------------------------------------------------

# FFTW version from OpenFOAM etc/config.sh file:
_foamConfig FFTW

fftwPACKAGE=${fftw_version:-fftw-system}

#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

usage: ${0##*/} [OPTION] [fftw-VERSION] [-- configure-options]
options:
  -gcc          Force use of gcc/g++
  -help

* build FFTW with
      ${fftwPACKAGE:-'unspecified FFTW version'}

USAGE
    exit 1
}
#------------------------------------------------------------------------------
exportCompiler          # Compiler info for CMake/configure

# Parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    '') ;;      # Ignore empty
    --) break;; # Extra configure options (leave on $@ for later detection)
    -h | -help) usage   ;;
    -gcc)       useGcc  ;;

    fftw-[0-9]* | fftw_[0-9]* | fftw-system )
        fftwPACKAGE="${1%%/}"
        ;;
    *)
        die "unknown option/argument: '$1'"
        ;;
    esac
    shift
done

[ -n "$fftwPACKAGE" ] || die "The fftw-VERSION was not specified"

# Nothing to build
if _foamIsNone "$fftwPACKAGE"
then
    echo "Using fftw-none (skip ThirdParty build of FFTW)"
    exit 0
elif _foamIsSystem "$fftwPACKAGE"
then
    echo "Using fftw-system (skip ThirdParty build of FFTW)"
    exit 0
fi

#------------------------------------------------------------------------------
#
# Build FFTW
# For 64-bit
# - FFTW itself will normally build into 'lib64',
#   but provide --libdir on configure to be 100% certain
# - Third-Party builds into 'lib64'
# - system is normally built into 'lib64'
#
#   FFTW_SOURCE_DIR : location of the original sources
#   FFTW_ARCH_PATH  : installation directory

FFTW_SOURCE_DIR=$sourceBASE/$fftwPACKAGE
FFTW_ARCH_PATH=$installBASE/$fftwPACKAGE

if [ -r "$FFTW_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/libfftw3$EXT_SO" ]
then
    echo "Already has FFTW shared library"
else
    echo "Starting build: FFTW ($fftwPACKAGE)"
    echo

    (
        # Configuration options:
        unset configOpt

        # Additional configure options
        if [ "$1" = "--" ]
        then
            shift
            configOpt="$configOpt $@"
        fi

        # End of configuration options
        # ----------------------------
        buildDIR=$buildBASE/$fftwPACKAGE

        cd "$FFTW_SOURCE_DIR" || exit
        export GIT_DIR="$PWD/.git" # Mask seeing our own git-repo

        rm -rf $FFTW_ARCH_PATH
        rm -rf $buildDIR
        mkdir -p $buildDIR
        cd $buildDIR

        set -x
        $FFTW_SOURCE_DIR/configure \
            --prefix=$FFTW_ARCH_PATH \
            --libdir=$FFTW_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH \
            --enable-shared --disable-static \
            --disable-fortran \
            $configOpt \
        && set +x \
        && make -j $WM_NCOMPPROCS \
        && make install \
        && echo "Built $fftwPACKAGE" \
        && pkgconfigAdjust $FFTW_ARCH_PATH
    ) || {
        echo "Error building: FFTW"
        exit 1
    }
fi

#------------------------------------------------------------------------------