#! /bin/sh

set -e
set -u

scriptsdir=`dirname "$0"`

get_optarg() {

	expr "x$1" : "x[^=]*=\\(.*\\)"
}

usage() {

	printf "usage: %s --prefix=/... --srcdir=/...\\n" "$0" 1>&2
	exit 1
}

while test $# -gt 0; do
	case "$1" in
	--prefix=*)
		prefix=`get_optarg "$1"`
		shift
		;;
	--srcdir=*)
		srcdir=`get_optarg "$1"`
		shift
		;;
	*)
		usage
		;;
	esac
done

case "${prefix+set},${prefix-}" in
"set,/"*)
	;;
*)	usage
	;;
esac

case "${srcdir+set},${srcdir-}" in
"set,/"*)
	;;
*)	usage
	;;
esac

pre_configure() {
	phase="pre_configure"

	test ! -f "${phase}_done" || return 0

	echo "done" > "${phase}_done"
}

do_configure() {
	phase="do_configure"

	test ! -f "${phase}_done" || return 0

	echo "done" > "${phase}_done"
}

post_configure() {
	phase="post_configure"

	test ! -f "${phase}_done" || return 0

	cat > "system-dependent-hacks.h" <<EOF
/*
 * This file contains system-dependent hacks and should be included
 * before _any_ other header file.
 */

/* The <linux/compiler.h> header defines the macro barrier() with zero
 * parameters, which conflicts with a function definition of the same
 * name in the <ulocks.h> header. Therefore, the header must be included
 * first. This only works because apparently the libfp does not use this
 * function. If it does nevertheless, the barrier macro must be undefined
 * before.
 */
#ifdef __linux
#  include <ulocks.h>
#endif
EOF

	find "${srcdir}/src" -type f -name '*.c++' \
		-exec perl "${scriptsdir}/sys-hacks.pl" '{}' ';'

	echo "done" > "${phase}_done"
}

pre_build() {
	phase="pre_build"

	test ! -f "${phase}_done" || return 0

	echo "done" > "${phase}_done"
}

do_build() {
	phase="do_build"

	test ! -f "${phase}_done" || return 0

	make

	echo "done" > "${phase}_done"
}

post_build() {
	phase="post_build"

	test ! -f "${phase}_done" || return 0

	echo "done" > "${phase}_done"
}

pre_install() {
	phase="pre_install"

	test ! -f "${phase}_done" || return 0

	echo "done" > "${phase}_done"
}

do_install() {
	phase="do_install"

	test ! -f "${phase}_done" || return 0

	make targets

	echo "done" > "${phase}_done"
}

post_install() {
	phase="post_install"

	test ! -f "${phase}_done" || return 0

	echo "done" > "${phase}_done"
}


pre_configure
do_configure
post_configure

pre_build
do_build
post_build

pre_install
do_install
post_install