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#!/bin/sh

# Slackware build script for ghc

# Copyright 2015 Mikko Värri, Finland
# Updated 2018 David Spencer, Baildon, West Yorkshire, U.K.
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

PRGNAM=ghc
VERSION=${VERSION:-8.4.3}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

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

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
  TARARCH=i386
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
  TARARCH=i386
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  TARARCH="x86_64"
else
  printf "$ARCH is not supported...\n"
  exit 1
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT

if [ "${BOOTSTRAP:-yes}" = "yes" ] ; then
  BOOTSTRAPDIR=$TMP/$PRGNAM-$VERSION-bootstrap
  rm -rf $BOOTSTRAPDIR

  cd $TMP
  rm -rf $PRGNAM-$VERSION
  tar xvf $CWD/$PRGNAM-$VERSION-$TARARCH-deb8-linux.tar.xz
  cd $PRGNAM-$VERSION
  chown -R root:root .
  find -L . \
   \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
    -o -perm 511 \) -exec chmod 755 {} \; -o \
   \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
    -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

  CFLAGS="$SLKCFLAGS" \
  CXXFLAGS="$SLKCFLAGS" \
  ./configure \
    --prefix=$BOOTSTRAPDIR/usr \
    --mandir=$BOOTSTRAPDIR/usr/man \
    --docdir=$BOOTSTRAPDIR/usr/doc/$PRGNAM-$VERSION \
    --libdir=$BOOTSTRAPDIR/usr/lib${LIBDIRSUFFIX}

  # GHC binary distributions are compiled in an environment where
  # libncurses is compiled as two separate libraries: libncurses and
  # libtinfo.  Slackware has all the symbols of libtinfo in libncurses,
  # so we can soft link libtinfo to libncurses.  But let's not do that
  # system wide.  The link is needed both during build ('make install')
  # and during runtime (/usr/bin/ghc*).
  LIBTINFO_DIR=$BOOTSTRAPDIR/usr/lib$LIBDIRSUFFIX
  mkdir -p $LIBTINFO_DIR
  ln -s /lib$LIBDIRSUFFIX/libncurses.so.5 $LIBTINFO_DIR/libtinfo.so.5
  LD_LIBRARY_PATH=$LIBTINFO_DIR \
  make install
  sed -i -r -e "s|^exec |LD_LIBRARY_PATH=$LIBTINFO_DIR exec |" $BOOTSTRAPDIR/usr/bin/ghc{,-pkg}-$VERSION

  BOOTSTRAPGHC=$BOOTSTRAPDIR/usr/bin/ghc
else
  BOOTSTRAPGHC=$( which ghc 2>/dev/null )
fi

cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION-src.tar.xz
cd $PRGNAM-$VERSION
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --sysconfdir=/etc \
  --localstatedir=/var \
  --mandir=/usr/man \
  --docdir=/usr/doc/$PRGNAM-$VERSION \
  --with-ghc=$BOOTSTRAPGHC

make
make install DESTDIR=$PKG

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

# If docs were not built and installed, let's install the prebuilt manpage
# (taken from ghc-8.4.3-x86_64-deb8-linux.tar.xz)
if [ ! -d $PKG/usr/man ]; then
  install -D -m0644 $CWD/ghc.1 $PKG/usr/man/man1
fi

find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

cp -a LICENSE $PKG/usr/doc/$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}