#!/bin/sh
#
# lapack.SlackBuild
# 2016-04-19
#
# The Linear Algebra PACKage (LAPACK) is written in Fortran90 and provides
# routines for solving systems of simultaneous linear equations,
# least-squares solutions of linear systems of equations,
# eigenvalue problems, and singular value problems.

PRGNAM=lapack
VERSION=3.6.0

# automatically determine the architecture
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i686) ARCH=i686 ;;
    i?86) ARCH=i486 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$(uname -m) ;;
  esac
fi


BUILD=${BUILD:-1}
TAG=${TAG:-scr}

HOMEPAGE="http://www.netlib.org/lapack/"
SOURCE="${PRGNAM}-${VERSION}.tgz"
DOWNLOAD="${HOMEPAGE}${SOURCE}"
MD5SUM="f2f6c67134e851fe189bb3ca1fbb5101"

REQUIRES=""

MAINTAINER="Gernot WALZL"
EMAIL="gernot.walzl@gmx.at"

DESC="Linear Algebra PACKage

LAPACK is written in Fortran90 and provides routines for
solving systems of simultaneous linear equations,
least-squares solutions of linear systems of equations,
eigenvalue problems, and singular value problems.

${HOMEPAGE}"

DOCS="$(pwd)/$0 LICENSE README"

# EOF info


# set initial variables
CWD=$(pwd)
TMP=${TMP:-/tmp}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

# exit on error
set -e

# download the source if needed
if [ ! -f $CWD/$SOURCE ]; then
  wget -O $CWD/$SOURCE $DOWNLOAD || exit 1
fi

# check for correct source file
if [ "$(md5sum $CWD/$SOURCE | cut -f 1 -d ' ')" != "$MD5SUM" ]; then
  exit 1
fi

# extract the application source
cd $TMP || exit 1
tar xvf $CWD/$SOURCE || exit 1

# change to the application source directory
cd $PRGNAM-$VERSION || exit 1

# fix permissions
chown -R root:root .
chmod -R u+w,go+r-w,a-s .

# set configure options
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"
  NOOPTFLAGS="-fPIC"
  LIBDIRSUFFIX="64"
 else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

# compile the source
cp INSTALL/make.inc.gfortran make.inc
make OPTS="$SLKCFLAGS" NOOPT="$NOOPTFLAGS" lapacklib || exit 1

# install everything into the package directory
rm -rf $PKG
mkdir -p $PKG/install
mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}
cp liblapack.a $PKG/usr/lib${LIBDIRSUFFIX}/liblapack.a || exit 1

# add documentation
if [ "$DOCS" != "" ]; then
  mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
  cp -a $DOCS $PKG/usr/doc/$PRGNAM-$VERSION
  find $PKG/usr/doc/$PRGNAM-$VERSION -type f -exec chmod 644 {} \;
fi

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

# add some description to the package
if [ "$DESC" != "" ]; then
  echo "$DESC" | sed 's/^/'$PRGNAM': /g' > $PKG/install/slack-desc
fi

# append dependency information to the package
if [ "$REQUIRES" != "" ]; then
  for REQ in $REQUIRES; do
    echo "$REQ" >> $PKG/install/slack-required
  done
fi

# build the package
cd $PKG
makepkg -l y -c n \
  $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz} \
  || exit 1

# make everything clean
cd $CWD
rm -rf $PKG
rm -rf $TMP/$PRGNAM-$VERSION