#!/bin/bash

# this script is to help those who must compile everything except the compiler.

# For example, CentOS < 8 users.

# if using Gfortran, Gfortran >= 6 is REQUIRED

# Newer Gfortran versions e.g. Gfortran 8, 9, etc. are recommended for better performance.

# Gfortran 6 is the oldest currently supported version, so stay ahead by using say Gfortran 8 or newer.

#

# Gemini currently has a bug with Ifort, but once that's fixed, Ifort should work. For now use Gfortran.

#

# Flang, PGI and/or NAG support are anticipated soon from vendors, possibly in 2019.

# Ask if desired.

set -e # abort on any error

set -u # abort on undefined variable (a common bash goof)

# ======= user config ====================

# Arbitrary names/locations

# all libraries installed under $PREFIX/libraryname

PREFIX=$HOME/.local

# whatever name you want to name at end of each library directory, arbitrary

SUFFIX=gcc7

# working directory, so you can rebuild later without complete recompilation

WD=$HOME/libs_gemini-$SUFFIX

# for each library, switch "true" to "false" if you don't want it.

BUILDMPI=true

BUILDLAPACK=true

BUILDSCALAPACK=true

BUILDMUMPS=true

# which compilers do you want?

export FC=$(which gfortran)

export CC=$(which gcc)

export CXX=$(which g++)

echo "FC=$FC"

echo "CC=$CC"

echo "CXX=$CXX"

# ================================================

# normally don't adjust parameters below this line

# Library parameters

LAPACKGIT=https://github.com/Reference-LAPACK/lapack

LAPACKPREFIX=$PREFIX/lapack-$SUFFIX

MPIVERSION=3.1.3 # MPI 4 doesn't currently work with ScalaPack

MPIFN=openmpi-$MPIVERSION.tar.bz2

MPIURL=https://download.open-mpi.org/release/open-mpi/v3.1/$MPIFN

MPISHA1=b3c60e2bdd5a8a8e758fd741f9a5bebb84da5e81

MPIPREFIX=$PREFIX/openmpi-$MPIVERSION-$SUFFIX

SCALAPACKGIT=https://github.com/scivision/scalapack

SCALAPACKPREFIX=$PREFIX/scalapack-$SUFFIX

MUMPSGIT=https://github.com/scivision/mumps

[[ $($FC -dumpversion) < 6 ]] && { echo "Gfortran >= 6 required"; exit 1; }

cmake --version

mkdir -p $WD

#==============================================================

# OpenMPI 3.1

# At this time, Scalapack isn't compatible with OpenMPI 4

# https://www.open-mpi.org/software/ompi/v3.1/

if $BUILDMPI

then

cd $WD

[[ -f $MPIFN ]] || curl -L $MPIURL -o $MPIFN

[[ $(sha1sum $MPIFN | cut -f1 -d' ') == $MPISHA1 ]] || { echo "checksum not match $MPIFN"; exit 1; }

tar -xf $MPIFN

cd $WD/openmpi-$MPIVERSION

echo "installing OpenMPI $MPIVERSION to $MPIPREFIX"

./configure --prefix=$MPIPREFIX CC=$CC CXX=$CXX FC=$FC

make -j -l2

make install

fi

#================================================================

# LAPACK

if $BUILDLAPACK

then

cd $WD

[[ -d lapack ]] && { cd lapack; git pull; cd ..; } || git clone --depth 1 $LAPACKGIT

cd lapack

mkdir -p build

cd build

cmake -DCMAKE_INSTALL_LIBDIR=$LAPACKPREFIX ..

cmake --build -j . --target install -- -l 2

fi

#===============

# scalapack

if $BUILDSCALAPACK

then

cd $WD

[[ -d scalapack ]] && { cd scalapack; git pull; cd ..; } || git clone --depth 1 $SCALAPACKGIT

cd scalapack/build

cmake -Wno-dev -DCMAKE_INSTALL_PREFIX=$SCALAPACKPREFIX -DMPI_ROOT=$MPIPREFIX -DLAPACK_ROOT=$LAPACKPREFIX ..

cmake --build -j . --target install -- -l 2

fi

#=================

# MUMPS

if $BUILDMUMPS; then

cd $WD

[[ -d mumps ]] && { cd mumps; git pull; cd ..; } || git clone --depth 1 $MUMPSGIT mumps

cd mumps

./build_self.sh $PREFIX $SUFFIX $MPIPREFIX $LAPACKPREFIX $SCALAPACKPREFIX

fi