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#!/bin/bash
# Copyright 2006-2018  Patrick J. Volkerding, Sebeka, MN, USA
# 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.

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=mpg123
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z* | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}

NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}

# 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

TMP=${TMP:-/tmp}
PKG=$TMP/package-${PKGNAM}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
  TARGET="x86"
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  TARGET=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  TARGET="x86-64"
elif [ "$ARCH" = "arm" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  TARGET="arm_nofpu"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  TARGET=""
fi

# If PulseAudio is not installed, configure for ALSA only and add _alsa $TAG:
if [ ! -r /usr/lib${LIBDIRSUFFIX}/pkgconfig/libpulse.pc ]; then
  TAG="_alsa"
  DEFAULT_AUDIO="--with-audio=alsa,oss,sdl --with-default-audio=alsa"
else
  # Configure for PulseAudio:
  DEFAULT_AUDIO="--with-audio=alsa,oss,sdl,pulse --with-default-audio=pulse"
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD$TAG.txz"
  exit 0
fi

# configure --help shows the following re TARGET:
# --with-cpu=i386_fpu		Use code optimized for i386 processors with floating point arithmetic
# --with-cpu=i386_nofpu		Use code optimized for i386 processors with fixed point arithmetic (experimental)
# --with-cpu=i486		Use code optimized for i486 processors (only usable alone!)
# --with-cpu=i586		Use code optimized for i586 processors
# --with-cpu=i586_dither	Use code optimized for i586 processors with dithering (noise shaping), adds 256K to binary size
# --with-cpu=3dnow		Use code optimized for 3DNow processors
# --with-cpu=3dnowext		Use code optimized for 3DNowExt processors (K6-3+, Athlon)
# --with-cpu=3dnowext_alone	Really only 3DNowExt decoder, without 3DNow fallback for flexible rate
# --with-cpu=mmx		Use code optimized for MMX processors
# --with-cpu=mmx_alone		Really only MMX decoder, without i586 fallback for flexible rate
# --with-cpu=sse		Use code optimized for SSE processors
# --with-cpu=sse_alone		Really only SSE decoder, without i586 fallback for flexible rate
# --with-cpu=x86		Pack all x86 opts into one binary (excluding i486, including dither)
# --with-cpu=x86-64		Use code optimized for x86-64 processors (AMD64 and Intel64, including dithered generic)
# --with-cpu=arm_nofpu		Use code optimized for ARM processors with fixed point arithmetic (experimental)

rm -rf $PKG
mkdir -p $PKG $TMP
cd $TMP
rm -rf ${PKGNAM}-${VERSION}
tar xvf $CWD/${PKGNAM}-$VERSION.tar.?z* || exit 1
cd ${PKGNAM}-$VERSION || exit 1

# Make sure ownerships and permissions are sane:
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 {} \;

# Configure:
CFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --sysconfdir=/etc \
  --mandir=/usr/man \
  --docdir=/usr/doc/${PKGNAM}-$VERSION \
  --with-cpu=$TARGET \
  $DEFAULT_AUDIO \
  --with-optimization=2 \
  --build=$ARCH-slackware-linux || exit 1

# Build and install:
make $NUMJOBS || make || exit 1
make install DESTDIR=$PKG || exit 1

# Don't ship .la files:
rm -f $PKG/{,usr/}lib${LIBDIRSUFFIX}/*.la

# Add compat symlinks for mpg321:
( cd $PKG/usr/bin ; ln -s mpg123 mpg321 )
( cd $PKG/usr/man/man1 ; ln -sf mpg123.1 mpg321.1 )

# 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

# 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

# Compress info files, if any:
if [ -d $PKG/usr/info ]; then
  ( cd $PKG/usr/info
    rm -f dir
    gzip -9 *
  )
fi

# Add a documentation directory:
mkdir -p $PKG/usr/doc/${PKGNAM}-$VERSION
cp -a \
  AUTHORS COPYING* ChangeLog INSTALL NEWS* README* TODO doc \
  $PKG/usr/doc/${PKGNAM}-$VERSION
#                  ^^^^^^^^^
# The ChangeLog is only a (small) pointer to an online ChangeLog...

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

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