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#! /bin/sh

set -e

TPL_PKGS='gcc-4.7 cpp-4.7 g++-4.7'

main()
{
	case "${1}" in
		clean)
			clean
			;;
		*)
			if [ -z "${PKG_TARGETS}" ]; then
				PKG_TARGETS="$(cat targets.in)"
			fi
			for arch in ${PKG_TARGETS}; do
				PKG_TARGET_ARCH="${arch}" configure_build
			done
			>targets.mk
			for stamp in configure build install; do
				printf '%s_targets = \\\n' "${stamp}" \
					>>targets.mk
				for arch in ${PKG_TARGETS}; do
					printf '\t%s-%s \\\n' \
						"${stamp}" "${arch}" \
						>>targets.mk
				done
				printf '\n' >>targets.mk
			done
			;;
	esac
}

msg()
{
	printf 'gcc-4.7 config: '
	printf "${@}"
	printf '\n'
}

configure_build()
{
	# Generate a sed script to edit files.
	_ss=
	for _name in TARGET_ARCH; do
		_ss="${_ss}s&@PKG_${_name}@&$(eval echo \$\{PKG_${_name}\})&;"
	done

	# Write metadata for <pkgbase>-<target> packages.
	for _pkg in ${TPL_PKGS}; do
		mkdir -p "${_pkg}-${PKG_TARGET_ARCH}.pkg"
		sed "${_ss}" "${_pkg}.pkg.in/control" \
			>"${_pkg}-${PKG_TARGET_ARCH}.pkg/control"
		cp "${_pkg}.pkg.in/files" "${_pkg}-${PKG_TARGET_ARCH}.pkg/files"
		msg 'Metadata for package "%s" generated.' \
			"${_pkg}-${PKG_TARGET_ARCH}"
	done
}

clean()
{
	# Remove generated metadata for <pkgbase>-<target> packages.
	for _pkg in ${TPL_PKGS}; do
		rm -Rf "${_pkg}"-*-*-*.pkg/
	done
}

main "${@}"