#!/bin/sh

# Copyright 2013, 2014, 2015  Patrick J. Volkerding, Sebeka, MN, USA
# Copyright 2014  Heinz Wiesinger, Amsterdam, NL
# 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.


PKGNAM=gc
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.xz | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-3}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) export ARCH=i586 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( uname -m ) ;;
  esac
fi

NUMJOBS=${NUMJOBS:-" -j7 "}

CWD=$(pwd)
TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM
rm -rf $PKG
mkdir -p $PKG/usr

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

cd $TMP
rm -rf $PKGNAM-$VERSION $PKGNAM-$(echo $VERSION | cut -b 1-3)
tar xvf $CWD/$PKGNAM-$VERSION.tar.xz || exit 1
cd $PKGNAM-$VERSION 2> /dev/null || cd $PKGNAM-$(echo $VERSION | cut -b 1-3) || exit 1
tar xvf $CWD/libatomic_ops-$VERSION.tar.xz || exit 1
mv libatomic_ops-$VERSION libatomic_ops
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 {} \;

# https://github.com/ivmai/bdwgc/pull/51
zcat $CWD/noelision.patch.gz | patch -p1 --verbose || exit 1

# Guarding GC_setup_mark_lock usage with PARALLEL_MARK is required to avoid
# an undefined reference in non-PARALLEL_MARK configurations:
zcat $CWD/refer_to_GC_setup_mark_lock_only_in_PARALLEL_MARK_code.patch.gz | patch -p0 --verbose || exit 1

sed -i 's#pkgdata#doc#' doc/doc.am
sed -i 's#pkgdata#doc#' libatomic_ops/Makefile.am
sed -i 's#pkgdata#doc#' libatomic_ops/doc/Makefile.am

autoreconf -vif
automake --add-missing

# See bugzilla.redhat.com/689877 for -DUSE_GET_STACKBASE_FOR_MAIN

CFLAGS="$SLKCFLAGS -DUSE_GET_STACKBASE_FOR_MAIN" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --infodir=/usr/info \
  --mandir=/usr/man \
  --disable-dependency-tracking \
  --enable-cplusplus \
  --enable-large-config \
  --enable-parallel-mark \
  --enable-threads=posix \
  --with-libatomic-ops=no \
  --build=$ARCH-slackware-linux

# NOTE:  Using --disable-static exports a subset of symbols, and has caused
# some things that use gc to break.  So it is recommended to build the static
# libraries and then remove them before packaging.

# Does not like parallel make...
make $NUMJOBS || make || exit 1
make install DESTDIR=$PKG || exit 1

mkdir -p $PKG/usr/man/man3
sed -i -e 's/GC_MALLOC 1L/gc 3/' doc/gc.man
install -m 644 doc/gc.man $PKG/usr/man/man3/gc.3

# Install libatomic_ops
cd libatomic_ops
  make install DESTDIR=$PKG || exit 1
cd -

# Remove static libraries that we don't want in the package, and fix the
# .la files to remove the references to them:
( cd $PKG/usr/lib${LIBDIRSUFFIX}
  for static in libcord libgc libgccpp ; do
    rm --verbose ${static}.a
    sed -i "s#old_library='.*'#old_library=''#g" ${static}.la
  done
)

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

# Compress and link manpages, if any:
if [ -d $PKG/usr/man ]; then
  ( cd $PKG/usr/man
    for manpagedir in $(find . -type d -name "man*") ; do
      ( cd $manpagedir
        for eachpage in $( find . -type l -maxdepth 1) ; do
          ln -s $( readlink $eachpage ).gz $eachpage.gz
          rm $eachpage
        done
        gzip -9 *.?
      )
    done
  )
fi

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
mv $PKG/usr/share/doc/* $PKG/usr/doc/$PKGNAM-$VERSION/
rm -f $PKG/usr/doc/$PKGNAM-$VERSION/gc/gc.man
rm -rf $PKG/usr/share
cp -a \
  README.QUICK TODO \
  $PKG/usr/doc/$PKGNAM-$VERSION

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

cd $PKG
/sbin/makepkg -l y -c n $TMP/$PKGNAM-$VERSION-$ARCH-$BUILD.txz