#!/bin/sh

error_msg()

{

	echo $@ >&2

}

host_test()

{

	mb_hdrdir=$(pwd)/build

	mkdir -p $mb_hdrdir || exit 2

	if [ x"$mb_compiler" = x ]; then

                echo "config error: compiler not set."

		exit 2

	fi

	$mb_compiler -dM -E - < /dev/null > /dev/null && return 0

	error_msg "config error: invalid compiler."

	exit 2

}

host_endian_h()

{

	mb_header='endian.h'

	rm -f "$mb_hdrdir"/$mb_header

	# portable

	$mb_compiler $mb_cflags \

		--include=$mb_header -E - < /dev/null > /dev/null 2>/dev/null \

		&& return 0

	# non-portable

	mb_hosthdr=

	[ -z $mb_hosthdr ] && $mb_compiler $mb_cflags \

		--include='sys/'$mb_header -E - < /dev/null > /dev/null 2>/dev/null \

		&& mb_hosthdr='sys/'$mb_header

	[ -z $mb_hosthdr ] && $mb_compiler $mb_cflags \

		--include='machine/'$mb_header -E - < /dev/null > /dev/null 2>/dev/null \

		&& mb_hosthdr='machine/'$mb_header

	if [ x"$mb_hosthdr" = x ]; then

		error_msg "config error: could not find an alternate <$mb_header>."

		exit 2

	fi

	printf "#include <%s>\\n" $mb_hosthdr > "$mb_hdrdir"/$mb_header || exit 2

}

# one: args

for arg ; do

	case "$arg" in

		--help)	usage

			;;

		--compiler=*)

			mb_compiler=${arg#*=}

			;;

		--cflags=*)

			mb_cflags=${arg#*=}

			;;

		*)

			error_msg ${arg#}: "unsupported config argument."

			exit 2

			;;

	esac

done

# two: test

host_test

# three: headers

host_endian_h

# all done

exit 0