#!/bin/bash

# libpng.SlackBuild
# by Stuart Winter <stuart@armedslack.org> for the Slackware porting Project.
# Heavily based on the original Slackware build script.
# 14-Jun-2004

# Record toolchain & other info for the build log:
slackbuildinfo

# Paths to skeleton port's source & real Slackware source tree:
export CWD=$SLACKSOURCE/$PKGSERIES/$PKGNAM
export PORTCWD=$PWD

# Temporary build locations:
export TMPBUILD=$TMP/build-$PKGNAM
export PKG=$TMP/package-$PKGNAM
mkpkgdirs # Delete & re-create temporary directories then cd into $TMPBUILD

# Determine the CFLAGS for the known architectures:
case $ARCH in
   arm)     SLKCFLAGS="-march=armv4 -mtune=xscale" ;;
   powerpc) SLKCFLAGS="" ;;
   sparc)   SLKCFLAGS="" ;;
   *)       SLKCFLAGS="" ;;
esac

# Create some package framework:
# (make install fails to do this)
mkdir -p $PKG/usr/{man/man{3,5},lib/pkgconfig,bin,include/libpng12,doc/$PKGNAM-$VERSION}

# Extract source:
tar xvvf $CWD/$PKGNAM-$VERSION.tar.bz2
cd $PKGNAM-$VERSION
slackhousekeeping

# Might as well link to -lz -lm, since the ./configure seems
# to be doing it that way now...  finally.  That'll prevent
# a couple of emails a week.  :-)
zcat $CWD/libpng.libs.diff.gz | patch -p1 --verbose || failpatch

# Need this to substitute macros, but we'll keep using the
# pre-built Makefile for now anyway...
./configure --prefix=/usr

# Link the custom makefile:
ln -sf scripts/makefile.linux ./Makefile

# Build:
make $NUMJOBS CC="cc $SLKCFLAGS" prefix=/usr || failmake
make install prefix=/usr DESTDIR=$PKG || failinstall

# This symlink is needed to keep old applications running:
# I guess the real lib used the major number 3, then 0 for
# a short while, and now .3 again.  Hopefully it will stay
# this way as it was .3 in Slackware 10.2.  One can hope.
( cd $PKG/usr/lib
  if [ ! -e libpng.so.0 -a -e libpng.so.3 ]; then
     ln -sf libpng.so.3 libpng.so.0
  fi )

# Install docs:
cp -favv ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO libpng.txt example.c \
         $PKG/usr/doc/$PKGNAM-$VERSION

# If necessary, start the fakeroot server so we can set file/dir ownerships:
start_fakeroot

# Apply generic Slackware packaging policies:
cd $PKG
slackstripall   # strip all .a archives and all ELFs
slackgzpages -i # compress man & info pages and delete usr/info/dir
slackslack      # chown -R root:root, chmod -R og-w, slackchown, slack644docs
slackdesc       # install slack-desc and doinst.sh
slackmp         # run makepkg -l y -c n

# Perform any final checks on the package:
cd $PKG
slackhlinks     # search for any hard links