#!/bin/sh

# Slackware build script for arpack

# Written by Pablo Santamaria (pablosantamaria@gmail.com)

PRGNAM=arpack
VERSION=${VERSION:-2.1}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i486 ;;
    arm*) ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

MAJOR=$(echo $VERSION | cut -d. -f1)

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf ARPACK
tar xvf $CWD/${PRGNAM}96.tar.gz
tar xvf $CWD/patch.tar.gz

patch -p0 < $CWD/arpack-2.1-redhat.patch
patch -p0 < $CWD/arpack-etime.patch
patch -p0 < $CWD/arpack-second-bug.patch

cd ARPACK
chown -R root:root .
find . \
 \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
 -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
 -exec chmod 644 {} \;

mkdir static shared
cd shared
for dir in ../SRC ../UTIL; do
  make -f $dir/Makefile VPATH=$dir srcdir=$dir \
       FC=gfortran FFLAGS="-std=legacy $SLKCFLAGS -fPIC" \
       single double complex complex16
done
gcc -shared -lblas -llapack -Wl,-soname,libarpack.so.$MAJOR -o libarpack.so.$VERSION *.o
cd ..
cd static
for dir in ../SRC ../UTIL; do
  make -f $dir/Makefile VPATH=$dir srcdir=$dir \
       FC=gfortran FFLAGS="-std=legacy $SLKCFLAGS" \
       single double complex complex16
done
ar rv libarpack.a *.o
ranlib libarpack.a
cd ..

mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}
install -p -m644 static/libarpack.a $PKG/usr/lib${LIBDIRSUFFIX}
install -p -m755 shared/libarpack.so.$VERSION $PKG/usr/lib${LIBDIRSUFFIX}
( cd $PKG/usr/lib${LIBDIRSUFFIX}
  ln -s libarpack.so.$VERSION libarpack.so.$MAJOR
  ln -s libarpack.so.$MAJOR libarpack.so )

find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a DOCUMENTS/* $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}