# Set up build environment
#
# Copyright (C) 2012 Patrick McDermott
#
# This file is part of opkbuild.
#
# opkbuild is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# opkbuild is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with opkbuild.  If not, see <http://www.gnu.org/licenses/>.

set -eu

setup_build_helper()
{
	local dep=
	local dep_pkg=

	IFS=', '
	for dep in $(ob_get_source_parameter 'Build-Depends'); do
		unset IFS
		ob_parse_dep -P dep_pkg -- "${dep}" >/dev/null
		if [ -r "${HELPERDIR}/${dep_pkg}" ]; then
			. "${HELPERDIR}/${dep_pkg}"
			PATH="${helper_path}:${PATH}"
		fi
	done
	unset IFS

	printf "PATH='%s'\n" "${PATH}"

	return 0
}

setup_toolchain()
{
	local tool_prefix=

	# This check is done to allow at least native building on unsupported
	# OSes.  It may be removed in the future.
	if [ x"${OPK_BUILD_ARCH}" != x"${OPK_HOST_ARCH}" ]; then
		tool_prefix="${OPK_HOST_ARCH}-"
	else
		tool_prefix=''
	fi

	# Set toolchain environment variables.
	# NB: This is written for GNU Binutils and GCC and won't work for, e.g.,
	# LLVM.
	cat <<-EOF
		AR='${tool_prefix}ar'
		AS='${tool_prefix}as'
		CC='${tool_prefix}gcc'
		CPP='${tool_prefix}cpp'
		CXX='${tool_prefix}g++'
		LD='${tool_prefix}ld'
		NM='${tool_prefix}nm'
		OBJCOPY='${tool_prefix}objcopy'
		OBJDUMP='${tool_prefix}objdump'
		RANLIB='${tool_prefix}ranlib'
		READELF='${tool_prefix}readelf'
		SIZE='${tool_prefix}size'
		STRINGS='${tool_prefix}strings'
		STRIP='${tool_prefix}strip'
		OPK_TOOL_PREFIX='${tool_prefix}'
		EOF

		return 0
}

setup_build_flags()
{
	local build_flags=

	build_flags="$(ob_get_system_path 'buildflags' "${OPK_HOST_ARCH}")"
	if [ -r "${build_flags}" ]; then
		. "${build_flags}"
	fi
	printf "CFLAGS='%s %s'\\n" "${CFLAGS:-}" \
		"-ffile-prefix-map=${PWD}=."
	printf "CXXFLAGS='%s %s'\\n" "${CXXFLAGS:-}" \
		"-ffile-prefix-map=${PWD}=."
	printf "TZ='UTC0'\\n"
	printf "LC_ALL='C'\\n"

	return 0
}

main()
{
	if ! ob_set_text_domain 'opkbuild'; then
		printf '%s: Error: Failed to load locale messages\n' \
			"${0##*/}" >&2
		return 1
	fi

	ob_init_package '..' || return 1

	ob_info "$(ob_get_msg 'setup_build_env')"

	setup_build_helper
	setup_toolchain
	setup_build_flags

	return 0
}