#!/bin/bash
#
# cross-compile win32 libraries for syslog-win32
# on exit libraries are in cross-libs directory
#
# required environment variables: DISTFILES
# honoured environment variables: CFLAGS, HOST
#

#
# define distfiles
#
libiconv=libiconv-1.9.2.tar.gz
gettext=gettext-0.14.1.tar.gz
zlib=zlib-1.2.2.tar.bz2
regex=regex-0.12.tar.gz
glib=glib-2.6.3.tar.bz2

function distfiles()
{
	echo $libiconv
	echo $gettext
	echo $zlib
	echo $regex
	echo $glib
}

#
# check DISTFILES and distfiles
#
if [ -z "$DISTFILES" ] ; then
	echo "You should specify location of source tarballs with the help of DISTFILES environment variable"
	exit 1
fi

for file in `distfiles` ; do
	if [ -f "$DISTFILES"/$file ] ; then continue ; fi
	echo $file not found
	exit 1
done

#
# set environment variables if not set yet
#
if [ -z "$CFLAGS" ] ; then
	export CFLAGS="-Os -g"
fi

if [ -z "$HOST" ] ; then
	export HOST=i686-pc-mingw32
fi

#
# a wrapper for subsequent commands
#
function run()
{
	echo "$@"
	"$@" || exit 1
}

#
# unpack routine
#
function unpack_tarball()
{
	if [[ zip == ${1:(-3)} ]] ; then
		run unzip "$1"
	else
		if [[ bz2 == ${1:(-3)} ]] ; then arch=j
		elif [[ gz == ${1:(-2)} ]] ; then arch=z
		elif [[ tar == ${1:(-3)} ]] ; then arch=
		else
			echo "Unknown distfile type"
			exit 1
		fi
		run tar -x${arch}f "$1"
	fi
}

#
# create build directories
#
export PREFIX=`pwd`/cross-libs
run mkdir -p cross-libs
run mkdir -p cross-build
run pushd cross-build

#
# build libiconv
#
unpack_tarball "$DISTFILES"/$libiconv
run pushd libiconv*
run ./configure --prefix="$PREFIX" --host=$HOST --disable-nls
run make
run make install
run popd
run rm -Rf libiconv*

#
# build gettext
#
unpack_tarball "$DISTFILES"/$gettext
run pushd gettext*/gettext-runtime
CPPFLAGS=-I"$PREFIX"/include LDFLAGS=-L"$PREFIX"/lib \
run ./configure --prefix="$PREFIX" --host=$HOST --enable-relocatable --with-libiconv-prefix="$PREFIX"
run make
run make install
run popd
run rm -Rf gettext*

#
# build zlib
# TO DO: use original makefile; dllname must be like in official windoze distro
#
unpack_tarball "$DISTFILES"/$zlib
run pushd zlib*
cat >configure.ac <<EOF
AC_INIT(zlib,1.2.2)
AM_INIT_AUTOMAKE
AC_CANONICAL_HOST
AC_PROG_CC
AC_PROG_LIBTOOL
AC_OUTPUT(Makefile)
EOF
cat >Makefile.am <<EOF
lib_LTLIBRARIES = libz.la
libz_la_SOURCES = adler32.c compress.c crc32.c deflate.c gzio.c \
                  infback.c inffast.c inflate.c inftrees.c trees.c uncompr.c zutil.c
include_HEADERS = zlib.h
libz_la_LDFLAGS = -no-undefined -release 1
EOF
run aclocal
run libtoolize
run autoconf
run automake --foreign --add-missing
run ./configure --prefix="$PREFIX" --host=$HOST
run make
run make install
run popd
run rm -Rf zlib*

#
# build regex
# NOT NEEDED
#
unpack_tarball "$DISTFILES"/$regex
run pushd regex*
cat >configure.ac <<EOF
AC_INIT(regex,0.12)
AM_INIT_AUTOMAKE
AC_CANONICAL_HOST
AC_PROG_CC
AC_PROG_LIBTOOL
AC_OUTPUT(Makefile)
EOF
cat >Makefile.am <<EOF
lib_LTLIBRARIES = libregex.la
libregex_la_SOURCES = regex.c
include_HEADERS = regex.h
libregex_la_LDFLAGS = -no-undefined
EOF
run rm -f configure.in
run aclocal
run libtoolize
run autoconf
run automake --foreign --add-missing
run ./configure --prefix="$PREFIX" --host=$HOST
run make
run make install
run popd
run rm -Rf regex*

#
# build glib
#
unpack_tarball "$DISTFILES"/$glib
run pushd glib*
#
# according to glib documentation, win32.cache is needed to skip tests that cannot be run in cross-compile environment
#
cat >win32.cache <<EOF
glib_cv_long_long_format=I64
glib_cv_stack_grows=no
EOF
run chmod a-w win32.cache
#
# remove policy that does not allow us to build static library for win32
#
run patch -Np1 -i ../../glib-static-win32.patch
run aclocal --force
run libtoolize --force
run autoconf --force
run automake --foreign --add-missing --force
OBJDUMP=$HOST-objdump CFLAGS='-Os -g' \
CPPFLAGS=-I"$PREFIX"/include \
LDFLAGS=-L"$PREFIX"/lib \
run ./configure --prefix="$PREFIX" --host=$HOST --with-libintl --disable-gtk-doc --cache-file=win32.cache --enable-static
WINDRES=$HOST-windres run make
run make install
run popd
run rm -Rf glib*
#
# explanations:
# - setting OBJDUMP is required for libtool's file format checking
# - WINDRES is required for resource compiling
#

#
# strip libraries and cleanup
#
run popd
$HOST-strip -s cross-libs/bin/*
run rmdir cross-build