#!/bin/sh

# project-agnostic ./configure script, written by hand.
# this file is covered by COPYING.SOFORT.

set -eu

trap config_failure 1 2 EXIT

# before we begin...
mb_path="$PATH"
mb_script="$0"
mb_success=no

usage()
{
	cat "$mb_project_dir"/config.usage

	if [ _$mb_use_custom_cfgdefs = _yes ]; then
		printf '\n\n%s%s\n' \
			" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" \
			"^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"

		printf '%s%s\n' \
			"| Listed above are configure's common switches " \
			"and environment variables.     |"

		printf '%s%s\n' \
			"| Found below are project-specific variables " \
			"and other customization options. |"

		printf '%s%s\n\n\n' \
			" ___________________________________________" \
			"__________________________________"

		cat "$mb_project_dir"/project/config/cfgdefs.usage
	fi

	exit 0
}

error_msg()
{
	printf '%s\n' "$@" >&2
}

warning_msg()
{
	printf '%s\n' "$@" >&2
}

output_step_prolog()
{
	mb_line_dots='.................................'
	mb_line_dots="${mb_line_dots}.${mb_line_dots}"
	mb_step_desc="${mb_package} : ${1##*/} : ${2}()  "
	mb_step_dlen="$((${#mb_line_dots} - ${#mb_step_desc}))"

	printf "configure step: ${2}()\n" >&3
	printf "%s%${mb_step_dlen}.${mb_step_dlen}s  " "${mb_step_desc}" "${mb_line_dots}"
}

output_step_epilog()
{
	printf 'OK.\n'
}

output_script_status()
{
	mb_step_name="${1##*/} : ${2}"
	mb_step_desc="${mb_package} : ${mb_step_name}"

	printf "configure info: ${2}\n" >&3
	printf "%s\n" "${mb_step_desc}"
}

output_section_break()
{
	printf ' ..\n'
}

verify_safe_path()
{
	case "$mb_safe_path_name" in
		-*)
			error_msg "$mb_safe_path_desc may not begin with a hyphen."
			exit 2
			;;

		*\ *)
			error_msg "$mb_safe_path_desc may not contain spaces."
			exit 2
			;;
	esac
}

init_log()
{
	exec 3> config.log

	printf "This is config.log, generated by sofort's configure script.\n\n" >&3
	printf '$ %s' "$mb_script" >&3
}

init_vars()
{
	mb_project_dir=$(cd -- "${mb_script%/*}/" ; pwd -P)
	mb_pwd=$(pwd -P)

	mb_safe_path_desc='project directory'
	mb_safe_path_name="$mb_project_dir"
	verify_safe_path

	mb_safe_path_desc='working directory'
	mb_safe_path_name="$mb_pwd"
	verify_safe_path

	mb_custom_cfgdefs_args=''
	mb_custom_cfgdefs_space=''

	mb_srcinfo='$(PROJECT_DIR)/project/srcdist/srcinfo.in'
	mb_srcsite='localhost'

	mb_pgprkey='!!VARIABLE_NOT_SET!!'
	mb_pgpskey='!!VARIABLE_NOT_SET!!'

	sfrt_impl_dir=$mb_project_dir/sofort
	sfrt_config_dir=$sfrt_impl_dir/config
	sfrt_core_dir=$sfrt_impl_dir/core
	sfrt_config_vars=$sfrt_config_dir/config.vars
	sfrt_flag_vars=$sfrt_config_dir/flag.vars
	sfrt_opt_vars=$sfrt_config_dir/opt.vars
	sfrt_cfgdefs_in=$sfrt_config_dir/cfgdefs.in

	mb_make_vars=$(< "$sfrt_config_vars" \
		grep -v -e '^#' -e '^$' | tr '[:lower:]' '[:upper:]')

	mb_impl_vars=$(< "$sfrt_config_vars" \
		grep -v -e '^#' -e '^$' | sed 's/^/mb_/g')

	mb_proj_vars=$(< "$sfrt_config_vars" \
		grep -v -e '^#' -e '^$' | sed 's/^/mb_default_/g')

	mb_flag_vars=$(< "$sfrt_flag_vars" \
		grep -v -e '^#' -e '^$')

	mb_vars="$mb_make_vars $mb_impl_vars $mb_proj_vars $mb_flag_vars"

	for mb_var in $(printf '%s' "$mb_vars") ; do
		mb_expr=$mb_var='${'$mb_var':-}'
		eval "$mb_expr"
	done

	# ccenv
	. $mb_project_dir/sofort/ccenv/ccenv.sh

	if ! [ -L ./ccenv ]; then
		if [ -d ./ccenv ]; then
			rm -f ./ccenv/host.mk
			rm -f ./ccenv/native.mk
			rmdir ./ccenv
		fi
	fi

	# config.project
	if [ -z "$mb_config" ]; then
		mb_config="$mb_project_dir/config.project"
	fi

	. "$mb_config"

	# config.project make preferences
	if [ -z "${MAKE}" ]; then
		MAKE="$mb_make"
	fi

	if [ -z "${MAKEMODE}" ]; then
		MAKEMODE="$mb_makemode"
	fi


	if [ -z "$mb_makefile" ]; then
		mb_makefile='Makefile'
	fi

	# project-specific initialization
	if [ _$mb_use_custom_cfginit = _yes ]; then
		. "$mb_project_dir/project/config/cfginit.sh"
	fi

	# package
	if [ -z "$mb_package" ]; then
		error_msg "$mb_script: incomplete information in $mb_config."
		error_msg "$mb_script: \$mb_package not set."
		exit 1
	fi

	if [ -z "${NICKNAME}" ]; then
		NICKNAME="$mb_nickname"
	fi

	# srcinfo
	if [ -n "$SOURCE_DIR" ]; then
		mb_source_dir_set=yes
	fi

	# step prolog
	output_step_prolog ${mb_script} 'init_vars'

	# project
	mb_nickname=$NICKNAME
	mb_source_dir=$SOURCE_DIR

	# dirs
	mb_prefix=$PREFIX
	mb_exec_prefix=$EXEC_PREFIX
	mb_bindir=$BINDIR
	mb_sbindir=$SBINDIR
	mb_libdir=$LIBDIR
	mb_includedir=$INCLUDEDIR
	mb_oldincludedir=$OLDINCLUDEDIR
	mb_mandir=$MANDIR
	mb_docdir=$DOCDIR
	mb_libexecdir=$LIBEXECDIR

	mb_sysconfdir=$SYSCONFDIR
	mb_sharedstatedir=$SHAREDSTATEDIR
	mb_localstatedir=$LOCALSTATEDIR
	mb_runstatedir=$RUNSTATEDIR
	mb_datarootdir=$DATAROOTDIR
	mb_datadir=$DATADIR
	mb_infodir=$INFODIR
	mb_localedir=$LOCALEDIR
	mb_htmldir=$HTMLDIR
	mb_dvidir=$DVIDIR
	mb_pdfdir=$PDFDIR
	mb_psdir=$PSDIR

	# make
	mb_make=$MAKE
	mb_makemode=$MAKEMODE

	# build
	mb_build=$BUILD
	mb_cchost=$CCHOST
	mb_cfghost=$CFGHOST
	mb_arch=$ARCH
	mb_compiler=$COMPILER
	mb_toolchain=$TOOLCHAIN
	mb_sysroot=$SYSROOT
	mb_cross_compile=$CROSS_COMPILE
	mb_shell=$SHELL

	# switches
	mb_cflags=$CFLAGS
	mb_cflags_debug=$CFLAGS_DEBUG
	mb_cflags_common=$CFLAGS_COMMON
	mb_cflags_cmdline=$CFLAGS_CMDLINE
	mb_cflags_config=$CFLAGS_CONFIG
	mb_cflags_sysroot=$CFLAGS_SYSROOT
	mb_cflags_os=$CFLAGS_OS
	mb_cflags_site=$CFLAGS_SITE
	mb_cflags_path=$CFLAGS_PATH
	mb_cflags_strict=$CFLAGS_STRICT
	mb_cflags_util=$CFLAGS_UTIL
	mb_cflags_last=$CFLAGS_LAST
	mb_cflags_once=$CFLAGS_ONCE

	mb_ldflags=$LDFLAGS
	mb_ldflags_debug=$LDFLAGS_DEBUG
	mb_ldflags_common=$LDFLAGS_COMMON
	mb_ldflags_cmdline=$LDFLAGS_CMDLINE
	mb_ldflags_config=$LDFLAGS_CONFIG
	mb_ldflags_sysroot=$LDFLAGS_SYSROOT
	mb_ldflags_path=$LDFLAGS_PATH
	mb_ldflags_strict=$LDFLAGS_STRICT
	mb_ldflags_util=$LDFLAGS_UTIL
	mb_ldflags_last=$LDFLAGS_LAST
	mb_ldflags_once=$LDFLAGS_ONCE

	mb_pe_subsystem=$PE_SUBSYSTEM
	mb_pe_image_base=$PE_IMAGE_BASE

	# overrides
	mb_user_cc=$CC
	mb_user_cpp=$CPP
	mb_user_cxx=$CXX

	mb_native_cc=$NATIVE_CC
	mb_native_cpp=$NATIVE_CPP
	mb_native_cxx=$NATIVE_CXX

	mb_native_host=$NATIVE_HOST
	mb_native_cfghost=$NATIVE_CFGHOST
	mb_native_cflags=$NATIVE_CFLAGS
	mb_native_ldflags=$NATIVE_LDFLAGS

	mb_native_pe_subsystem=$NATIVE_PE_SUBSYSTEM
	mb_native_pe_image_base=$NATIVE_PE_IMAGE_BASE

	# step epilog
	output_step_epilog
}


verify_build_directory()
{
	output_step_prolog ${mb_script} 'verify_build_directory'

	if [ "$mb_project_dir" = "$mb_pwd" ]; then
		if [ _$mb_require_out_of_tree = _yes ]; then
			error_msg "$mb_package: out-of-tree builds are required."
			error_msg "please invoke configure again from a clean build directory."
			exit 1
		else
			mb_project_dir='.'
		fi
	fi

	if [ -f "$mb_pwd/Makefile.common" ]; then
		error_msg
		error_msg "$mb_package: the file-name Makefile.common is reserved for bootstrapping projects."
		error_msg "$mb_package: please remove or rename the file manually and then re-run configure."
		exit 1
	fi

	rm -f Makefile Makefile.host Makefile.tmp Makefile.failed $mb_makefile

	output_step_epilog
}


verify_source_directory()
{
	output_step_prolog ${mb_script} 'verify_source_directory'

	if [ _"$mb_source_dir" != _${mb_source_dir##* } ]; then
		error_msg "source directory path contains spaces, aborting."
		exit 1
	fi

	eval mb_source_dir=$(printf '%s' "$mb_source_dir")

	if [ -z "$mb_source_dir" ]; then
		if [ _$mb_require_source_dir = _yes ]; then
			error_msg "$mb_package: specifying an external source directory is required."
			error_msg "you can set the source directory either via --source-dir=<path>,"
			error_msg "or by setting the SOURCE_DIR variable."
			exit 1
		fi
	fi

	output_step_epilog
}


verify_source_info()
{
	output_step_prolog ${mb_script} 'verify_source_info'

	if [ "${mb_source_dir_set:-}" = yes ]; then
		if [ -n "$mb_rawball" ] || [ -n "$mb_modball" ] || [ -n "$mb_srcball" ]; then
			error_msg "$mb_package: conflicting arguments: --rawball/--modball/--srcball arguments"
			error_msg "may not be used together with an explicit source-dir argument or variable."
			exit 1
		fi
	fi

	if [ -n "$mb_srcball" ]; then
		eval mb_srcball=$(printf '%s' "$mb_srcball")

		if [ -n "$mb_rawball" ] || [ -n "$mb_modball" ]; then
			error_msg "$mb_package: conflicting arguments: --rawball and/or --modball arguments"
			error_msg "may not be used together with an explicitly --srcball argument."
			exit 1
		fi

		if [ -z "$mb_srcball_sha256" ]; then
			error_msg "$mb_package: --srcball-sha256 must be provided"
			error_msg "in conjunction with --srcball."
			exit 1
		fi

		mb_srcball_sha256_test=$(sha256sum "$mb_srcball")
		mb_srcball_sha256_test="${mb_srcball_sha256_test%% *}"

		if [ "$mb_srcball_sha256_test" != "$mb_srcball_sha256" ]; then
			error_msg "$mb_package: sha256 signature of srcball $mb_srcball does not match!"
			exit 1
		fi

		mb_srcball_topdir=$(xz -c -d "$mb_srcball" | pax | sed -n '1,1p')
		mb_source_dir="./srctree/$mb_package/${mb_srcball_topdir%/}"

		mb_srcball_dirname=$(cd -- "${mb_srcball%/*}" ; pwd -P)
		mb_srcball_basename=${mb_srcball##*/}
		mb_srcball="$mb_srcball_dirname/$mb_srcball_basename"

		mkdir -p "./srctree/$mb_package"
		mb_dummy=$(cd -- "./srctree/$mb_package"; xz -c -d "$mb_srcball" | pax -r)
		mb_source_dir=$(cd -- $mb_source_dir; pwd -P)
	fi

	if [ -z "$mb_rawball" ] && [ -n "$mb_modball" ]; then
		error_msg "$mb_package: conflicting arguments: --modball argument may only be used"
		error_msg "together with an explicit --rawball argument."
		exit 1
	fi

	if [ -n "$mb_modball" ]; then
		eval mb_modball=$(printf '%s' "$mb_modball")

		if [ -z "$mb_modball_sha256" ]; then
			error_msg "$mb_package: --modball-sha256 must be provided"
			error_msg "in conjunction with --modball."
			exit 1
		fi

		mb_modball_sha256_test=$(sha256sum "$mb_modball")
		mb_modball_sha256_test="${mb_modball_sha256_test%% *}"

		if [ "$mb_modball_sha256_test" != "$mb_modball_sha256" ]; then
			error_msg "$mb_package: sha256 signature of modball $mb_modball does not match!"
			exit 1
		fi
	fi

	if [ -n "$mb_rawball" ]; then
		eval mb_rawball=$(printf '%s' "$mb_rawball")

		if [ -z "$mb_rawball_sha256" ]; then
			error_msg "$mb_package: --rawball-sha256 must be provided."
			error_msg "in conjunction with --rawball."
			exit 1
		fi

		mb_rawball_sha256_test=$(sha256sum "$mb_rawball")
		mb_rawball_sha256_test="${mb_rawball_sha256_test%% *}"

		if [ "$mb_rawball_sha256_test" != "$mb_rawball_sha256" ]; then
			error_msg "$mb_package: sha256 signature of rawball $mb_rawball does not match!"
			exit 1
		fi

		mb_rawball_topdir=$(xz -c -d "$mb_rawball" | pax | sed -n '1,1p')
		mb_source_dir="./srctree/$mb_package/${mb_rawball_topdir%/}"

		mb_rawball_dirname=$(cd -- "${mb_rawball%/*}" ; pwd -P)
		mb_rawball_basename=${mb_rawball##*/}
		mb_rawball="$mb_rawball_dirname/$mb_rawball_basename"

		mkdir -p "./srctree/$mb_package"
		mb_dummy=$(cd -- "./srctree/$mb_package"; xz -c -d "$mb_rawball" | pax -r)
		mb_source_dir=$(cd -- $mb_source_dir; pwd -P)
	fi

	if [ -n "$mb_modball" ]; then
		mb_modball_dirname=$(cd -- "${mb_modball%/*}" ; pwd -P)
		mb_modball_basename=${mb_modball##*/}
		mb_modball="$mb_modball_dirname/$mb_modball_basename"

		mb_modball_topdir="./modtree/$mb_package/$mb_modball_sha256"
		mkdir -p "$mb_modball_topdir"
		mb_modball_topdir=$(cd -- $mb_modball_topdir; pwd -P)
		mb_dummy=$(cd -- "$mb_modball_topdir"; xz -c -d "$mb_modball" | pax -r)

		if [ -d "$mb_modball_topdir/overlay" ]; then
			mb_dummy=$(cd -- "$mb_modball_topdir/overlay"; \
				cp -p -P -R . "$mb_source_dir")
		fi

		if [ -d "$mb_modball_topdir/patches" ]; then
			mb_dummy=$(cd -- "$mb_source_dir";                        \
				for p in $mb_modball_topdir/patches/*.patch; do  \
					patch -p1 < $p;                         \
				done);
		fi
	fi

	output_step_epilog
}


common_defaults()
{
	# step prolog
	output_step_prolog ${mb_script} 'common_defaults'

	# project-specific config definitions
	if [ _$mb_use_custom_cfgdefs = _yes ]; then
		cat $sfrt_cfgdefs_in > cfgdefs.mk
	else
		printf '%s %s\n\n' \
				'# this project does not include' \
				'a custom config step.'           \
			> cfgdefs.mk
		cat $sfrt_cfgdefs_in >> cfgdefs.mk

		if [ -f $mb_project_dir/project/cfgdefs.in ]; then
			cat $mb_project_dir/project/cfgdefs.in >> cfgdefs.mk
		fi
	fi

	# user build-time overrides
	touch usrdefs.mk

	# git
	if [ -n "$mb_source_dir" ]; then
		if [ -d "$mb_source_dir/.git" ]; then
			mb_git_reference_index="\$(SOURCE_DIR)/.git/index"
		fi
	elif [ -d "$mb_project_dir/.git" ]; then
		mb_git_reference_index="\$(PROJECT_DIR)/.git/index"
	fi

	# project
	[ -n "$mb_nickname" ] 		|| mb_nickname=$mb_package
	[ -n "$mb_source_dir" ] 	|| mb_source_dir=$mb_project_dir
	[ -n "$mb_avoid_version" ] 	|| mb_avoid_version='no'

	# pkgconfig
	[ -n "$mb_pkgname" ]		|| mb_pkgname="$mb_default_pkgname"
	[ -n "$mb_pkgdesc" ]		|| mb_pkgdesc="$mb_default_pkgdesc"
	[ -n "$mb_pkgusrc" ]		|| mb_pkgusrc="$mb_default_pkgusrc"
	[ -n "$mb_pkgrepo" ]		|| mb_pkgrepo="$mb_default_pkgrepo"
	[ -n "$mb_pkgpsrc" ]		|| mb_pkgpsrc="$mb_default_pkgpsrc"
	[ -n "$mb_pkgdurl" ]		|| mb_pkgdurl="$mb_default_pkgdurl"
	[ -n "$mb_pkgbugs" ]		|| mb_pkgbugs="$mb_default_pkgbugs"
	[ -n "$mb_pkghome" ]		|| mb_pkghome="$mb_default_pkghome"
	[ -n "$mb_pkgdefs" ]		|| mb_pkgdefs="$mb_default_pkgdefs"
	[ -n "$mb_pkglibs" ]		|| mb_pkglibs="$mb_default_pkglibs"

	# srcinfo
	[ -n "$mb_rawball" ]		|| mb_rawball="$mb_default_rawball"
	[ -n "$mb_rawball_url" ]	|| mb_rawball_url="$mb_default_rawball_url"
	[ -n "$mb_rawball_sha256" ]	|| mb_rawball_sha256="$mb_default_rawball_sha256"
	[ -n "$mb_modball" ]		|| mb_modball="$mb_default_modball"
	[ -n "$mb_modball_url" ]	|| mb_modball_url="$mb_default_modball_url"
	[ -n "$mb_modball_sha256" ]	|| mb_modball_sha256="$mb_default_modball_sha256"
	[ -n "$mb_srcball" ]		|| mb_srcball="$mb_default_srcball"
	[ -n "$mb_srcball_url" ]	|| mb_srcball_url="$mb_default_srcball_url"
	[ -n "$mb_srcball_sha256" ]	|| mb_srcball_sha256="$mb_default_srcball_sha256"

	# dirs
	[ -n "$mb_prefix" ] 		|| [ -n "$mb_prefix_set" ] \
					|| mb_prefix='/usr/local'

	[ -n "$mb_exec_prefix" ] 	|| [ -n "$mb_exec_prefix_set" ]	\
					|| mb_exec_prefix=$mb_prefix

	[ -n "$mb_bindir" ] 		|| [ -n "$mb_bindir_set" ] \
					|| [ -n "$mb_bindir_basename" ] \
					|| mb_bindir=$mb_exec_prefix/bin

	[ -n "$mb_bindir" ] 		|| [ -n "$mb_bindir_set" ] \
					|| mb_bindir=$mb_exec_prefix/$mb_bindir_basename

	[ -n "$mb_sbindir" ] 		|| mb_sbindir=$mb_exec_prefix/sbin
	[ -n "$mb_libdir" ] 		|| mb_libdir=$mb_exec_prefix/lib
	[ -n "$mb_includedir" ]		|| mb_includedir=$mb_prefix/include
	[ -n "$mb_oldincludedir" ]	|| mb_oldincludedir=$mb_prefix/include
	[ -n "$mb_datarootdir" ] 	|| mb_datarootdir=$mb_prefix/share
	[ -n "$mb_mandir" ] 		|| mb_mandir=$mb_datarootdir/man
	[ -n "$mb_docdir" ] 		|| mb_docdir=$mb_datarootdir/doc/'$(PACKAGE)'
	[ -n "$mb_libexecdir" ]		|| mb_libexecdir=$mb_exec_prefix/libexec

	[ -n "$mb_sysconfdir" ] 	|| mb_sysconfdir=$mb_exec_prefix/etc
	[ -n "$mb_sharedstatedir" ] 	|| mb_sharedstatedir=$mb_prefix/com
	[ -n "$mb_localstatedir" ] 	|| mb_localstatedir=$mb_prefix/var
	[ -n "$mb_runstatedir" ] 	|| mb_runstatedir=$mb_localstatedir/run
	[ -n "$mb_datarootdir" ] 	|| mb_datarootdir=$mb_prefix/share
	[ -n "$mb_datadir" ] 		|| mb_datadir=$mb_datarootdir
	[ -n "$mb_infodir" ] 		|| mb_infodir=$mb_datarootdir/info
	[ -n "$mb_localedir" ] 		|| mb_localedir=$mb_datarootdir/locale
	[ -n "$mb_htmldir" ] 		|| mb_htmldir=$mb_docdir
	[ -n "$mb_dvidir" ] 		|| mb_dvidir=$mb_docdir
	[ -n "$mb_pdfdir" ] 		|| mb_pdfdir=$mb_docdir
	[ -n "$mb_psdir" ] 		|| mb_psdir=$mb_docdir

	# switches
	[ -n "$mb_cflags_debug" ]	|| mb_cflags_debug=$mb_default_cflags_debug
	[ -n "$mb_cflags_common" ]	|| mb_cflags_common=$mb_default_cflags_common
	[ -n "$mb_cflags_cmdline" ]	|| mb_cflags_cmdline=$mb_default_cflags_cmdline
	[ -n "$mb_cflags_config" ]	|| mb_cflags_config=$mb_default_cflags_config
	[ -n "$mb_cflags_sysroot" ]	|| mb_cflags_sysroot=$mb_default_cflags_sysroot
	[ -n "$mb_cflags_os" ]		|| mb_cflags_os=$mb_default_cflags_os
	[ -n "$mb_cflags_site" ]	|| mb_cflags_site=$mb_default_cflags_site
	[ -n "$mb_cflags_path" ]	|| mb_cflags_path=$mb_default_cflags_path
	[ -n "$mb_cflags_strict" ]	|| mb_cflags_strict=$mb_default_cflags_strict
	[ -n "$mb_cflags_util" ]	|| mb_cflags_util=$mb_default_cflags_util
	[ -n "$mb_cflags_last" ]	|| mb_cflags_last=$mb_default_cflags_last
	[ -n "$mb_cflags_once" ]	|| mb_cflags_once=$mb_default_cflags_once

	[ -n "$mb_ldflags_debug" ]	|| mb_ldflags_debug=$mb_default_ldflags_debug
	[ -n "$mb_ldflags_common" ]	|| mb_ldflags_common=$mb_default_ldflags_common
	[ -n "$mb_ldflags_cmdline" ]	|| mb_ldflags_cmdline=$mb_default_ldflags_cmdline
	[ -n "$mb_ldflags_config" ]	|| mb_ldflags_config=$mb_default_ldflags_config
	[ -n "$mb_ldflags_sysroot" ]	|| mb_ldflags_sysroot=$mb_default_ldflags_sysroot
	[ -n "$mb_ldflags_path" ]	|| mb_ldflags_path=$mb_default_ldflags_path
	[ -n "$mb_ldflags_strict" ]	|| mb_ldflags_strict=$mb_default_ldflags_strict
	[ -n "$mb_ldflags_util" ]	|| mb_ldflags_util=$mb_default_ldflags_util
	[ -n "$mb_ldflags_last" ]	|| mb_ldflags_last=$mb_default_ldflags_last
	[ -n "$mb_ldflags_once" ]	|| mb_ldflags_once=$mb_default_ldflags_once

	# native switches
	[ -n "$mb_native_cflags" ]	|| mb_native_cflags=$mb_default_native_cflags
	[ -n "$mb_native_ldflags" ]	|| mb_native_ldflags=$mb_default_native_ldflags

	# config
	[ -n "$mb_all_static" ]		|| mb_all_static='no'
	[ -n "$mb_all_shared" ]		|| mb_all_shared='no'
	[ -n "$mb_disable_frontend" ]	|| mb_disable_frontend='no'
	[ -n "$mb_disable_static" ]	|| mb_disable_static='no'
	[ -n "$mb_disable_shared" ]	|| mb_disable_shared='no'

	# host/target
	[ -n "$mb_host" ] 		|| mb_host=$mb_target
	[ -n "$mb_target" ] 		|| mb_target=$mb_host

	# sysroot
	if [ -n "$mb_sysroot" ]; then
		if [ -z "$mb_cflags_sysroot" ]; then
			mb_cflags_sysroot="--sysroot=$mb_sysroot"
		fi

		if [ -z "$mb_ldflags_sysroot" ]; then
			mb_ldflags_sysroot="--sysroot=$mb_sysroot"
		fi
	fi

	# debug
	if [ _$mb_debug = _yes ]; then
		if [ -z "$mb_cflags_debug" ]; then
			mb_cflags_debug='-g3 -O0'
		fi
	fi

	# make
	if [ -z "$mb_make" ]; then
		mb_make='make'
	fi

	if [ -z "$mb_makemode" ]; then
		mb_makemode='posix'

		printf '%s\n%s\n%s\n\n%s\n\n'        \
				'ifeq (a,b)'          \
				'VAR = val'            \
				'endif'                 \
				'all:'                   \
			| ${mb_make} -s -f - 2>/dev/null  \
		&& mb_makemode='modern'

	fi

	# shell
	if [ -z "$mb_shell" ]; then
		mb_shell='/bin/sh'
	fi

	# inherited cflags & ldflags
	mb_cflags_cmdline="$mb_cflags_cmdline $mb_cflags"
	mb_ldflags_cmdline="$mb_ldflags_cmdline $mb_ldflags"

	# add the prefix's library directory to the linker library path
	mb_ldflags_last="$mb_ldflags_last -L$mb_libdir"

	# step epilog
	output_step_epilog
}


config_flags()
{
	# step prolog
	output_step_prolog ${mb_script} 'config_flags'

	mb_ldflags_tmp=" $mb_ldflags "
	mb_ldflags_libs=$(printf '%s' "$mb_ldflags_tmp" | sed 's/ -static / /g')

	if [ "$mb_ldflags_tmp" != "$mb_ldflags_libs" ]; then
		mb_ldflags="$mb_ldflags_libs"
		mb_ldflags_util="$mb_ldflags_util -static"
	fi

	# ccstrict
	if [ _$mb_ccstrict = _yes ]; then
		mb_cflags_strict='-Wall -Werror -Wextra -Wundef'
	fi

	# ldstrict
	if [ _$mb_ldstrict = _yes ]; then
		mb_ldflags_strict='-Wl,--no-undefined'
	fi

	# step epilog
	output_step_epilog
}


config_opts()
{
	if [ "$mb_avoid_version" = 'yes' ]; then
		mb_version_opt='none'
	else
		mb_version_opt='used'
	fi

	if [ "$mb_custom_install_headers" = 'yes' ]; then
		mb_install_headers_opt='custom'
	else
		mb_install_headers_opt='default'
	fi

	if [ "$mb_disable_static" = 'yes' ]; then
		mb_static_library_opt='disabled'
	else
		mb_static_library_opt='enabled'
	fi

	if [ "$mb_disable_shared" = 'yes' ]; then
		mb_shared_library_opt='disabled'
	else
		mb_shared_library_opt='enabled'
	fi

	if [ "$mb_disable_frontend" = 'yes' ]; then
		mb_app_frontend_opt='disabled'
	else
		mb_app_frontend_opt='enabled'
	fi

	if [ "$mb_all_static" = 'yes' ]; then
		mb_app_linking_opt='all_static'

	elif [ "$mb_all_shared" = 'yes' ]; then
		mb_app_linking_opt='all_shared'

	else
		mb_app_linking_opt='default'
	fi
}

config_copy()
{
	output_step_prolog ${mb_script} 'config_copy'

	mb_var_defs=
	mb_sed_substs=
	mb_template="${1:-$mb_project_dir/Makefile.in}"

	mb_vars=$(cut -d'=' -f1 "$sfrt_config_vars" "$sfrt_opt_vars" \
		| grep -v '^#');

	for __var in $(printf '%s' "$mb_vars"); do
		mb_sed_subst=$(printf '%s %s%s%s'  \
				'-e' "'s^@$__var@"  \
				"^___${__var}___"    \
				"^g'")

		mb_sed_substs="$mb_sed_substs $mb_sed_subst"

		mb_var_def=$(printf '%s%s="${%s}"' "-D" "___${__var}___" "mb_${__var}")
		eval mb_var_defs='"$mb_var_defs "$mb_var_def'
	done

	eval sed $mb_sed_substs $mb_template         \
			| eval m4 $mb_var_defs -      \
			| sed -e 's/[[:blank:]]*$//g'  \
		> $mb_pwd/Makefile.tmp

	output_step_epilog
}


config_ccenv()
{
	mkdir -p ./ccenv
	touch ./ccenv/host.mk
	touch ./ccenv/native.mk

	output_section_break
	ccenv_set_host_variables

	output_section_break
	ccenv_set_native_variables

	output_section_break
	config_copy
}

config_custom_cfgdefs()
{
	. $mb_project_dir/project/config/cfgdefs.sh
}

config_custom()
{
	if [ _$mb_use_custom_cfgdefs = _yes ]; then
		output_section_break
		output_script_status ${mb_script} \
			'invoking project-specific cfgdefs.sh'

		eval config_custom_cfgdefs "$mb_custom_cfgdefs_args"

		output_section_break

		if [ -f "$mb_project_dir/project/config/Makefile.in" ]; then
			config_copy "$mb_project_dir/project/config/Makefile.in"
			mv $mb_pwd/Makefile.tmp Makefile
		fi

		config_copy
	fi

	if [ _$mb_use_custom_usrdefs = _yes ]; then
		output_section_break
		output_script_status ${mb_scirpt} \
			'invoking project-specific usrdefs.sh'

		. $mb_project_dir/project/usrdefs.sh
		output_section_break
	fi
}


config_cfghost()
{
	output_step_prolog ${mb_script} 'config_cfghost'

	if [ -z "$mb_cfghost" ]; then
		mb_cfghost=$mb_cchost
	fi

	sed		-e 's^@cchost@^'"$mb_cchost"'^g'     \
			-e 's^@cfghost@^'"$mb_cfghost"'^g'   \
		$mb_pwd/Makefile.tmp > $mb_pwd/Makefile.host

	rm  $mb_pwd/Makefile.tmp
	mv  $mb_pwd/Makefile.host $mb_pwd/$mb_makefile

	output_step_epilog
}


config_host()
{
	output_step_prolog ${mb_script} 'config_host'

	# verify configuration for the host's (cross-)compiler
	${mb_make} -s host.tag       \
		-f "$mb_makefile"     \
		&& output_step_epilog  \
		&& return 0

	# should never happen
	error_msg "configure was able to generate a Makefile for the selected host,"
	error_msg "however the host-targeting compiler was found to be missing"
	error_msg "at least one of the required headers or features."
	exit 2
}


config_fini()
{
	# project-specific post-configuration steps
	if [ _$mb_use_custom_cfgfini = _yes ]; then
		. "$mb_project_dir/project/config/cfgfini.sh"
	fi
}


config_status()
{
	output_script_status ${mb_script} \
		'configuration completed successfully.'
	printf '\n'
}


config_failure()
{
	if [ _$mb_success = _yes ]; then
		return 0
	fi

	printf 'configure info: exiting due to an error.\n' >&3

	exit 2
}


config_success()
{
	trap '' EXIT
	mb_success=yes
	exit 0
}


# one: init
mb_args_defs=
mb_args_text=
mb_args_idx=0

init_log

for arg ; do
	mb_args_idx=$((mb_args_idx+1))

	mb_arg_def=$(printf '%s%s="${%s}"' "-D_" "${mb_args_idx}" "${mb_args_idx}")
	eval mb_args_defs='"$mb_args_defs "$mb_arg_def'

	mb_args_text="$mb_args_text '_$((mb_args_idx))'"
done

printf "$mb_args_text\n\n" | eval m4 $mb_args_defs - >&3

if [ $mb_args_idx -gt 1 ]; then
	printf '$ %s' "$mb_script" >&3

	mb_args_idx=0
	mb_args_text=

	for arg; do
		mb_args_idx=$((mb_args_idx+1))
		mb_args_text="$mb_args_text"$(printf ' \\\\\n\t%s_%d%s' "'" "$mb_args_idx" "'")
	done

	printf "$mb_args_text\n\n" | eval m4 $mb_args_defs - >&3
fi

init_vars
verify_build_directory


# two: args
for arg ; do
	case "$arg" in
		--help)
			usage
			;;
		--help=ccenv)
			ccenv_usage
			;;

		# ccenv
		--cross-compile=*)
			mb_cross_compile=${arg#*=}
			;;
		--compiler=*)
			mb_compiler=${arg#*=}
			;;
		--toolchain=*)
			mb_toolchain=${arg#*=}
			;;
		--zealous)
			mb_agnostic=yes
			mb_zealous=
			;;
		--zealous=*)
			mb_zealous=${arg#*=}
			;;
		--ccenv=*)
			mb_ccenv=${arg#*=}
			;;

		# dirs
		--prefix=*)
			mb_prefix_set=yes
			mb_prefix=${arg#*=}
			;;
		--exec-prefix=*)
			mb_exec_prefix_set=yes
			mb_exec_prefix=${arg#*=}
			;;
		--bindir=*)
			mb_bindir_set=yes
			mb_bindir=${arg#*=}
			;;
		--sbindir=*)
			mb_sbindir=${arg#*=}
			;;
		--libdir=*)
			mb_libdir=${arg#*=}
			;;
		--includedir=*)
			mb_includedir=${arg#*=}
			;;
		--oldincludedir=*)
			mb_oldincludedir=${arg#*=}
			;;
		--mandir=*)
			mb_mandir=${arg#*=}
			;;
		--libexecdir=*)
			mb_libexecdir=${arg#*=}
			;;


		--sysconfdir=*)
			mb_sysconfdir=${arg#*=}
			;;
		--sharedstatedir=*)
			mb_sharedstatedir=${arg#*=}
			;;
		--localstatedir=*)
			mb_localstatedir=${arg#*=}
			;;
		--runstatedir=*)
			mb_runstatedir=${arg#*=}
			;;
		--datarootdir=*)
			mb_datarootdir=${arg#*=}
			;;
		--datadir=*)
			mb_datadir=${arg#*=}
			;;
		--infodir=*)
			mb_infodir=${arg#*=}
			;;
		--localedir=*)
			mb_localedir=${arg#*=}
			;;
		--htmldir=*)
			mb_htmldir=${arg#*=}
			;;
		--dvidir=*)
			mb_dvidir=${arg#*=}
			;;
		--pdfdir=*)
			mb_pdfdir=${arg#*=}
			;;
		--psdir=*)
			mb_psdir=${arg#*=}
			;;

		#make
		--make=*)
			mb_make=${arg#*=}
			;;

		--makemode=*)
			mb_makemode=${arg#*=}
			;;

		# build
		--build=*)
			mb_build=${arg#*=}
			;;
		--host=*)
			mb_host=${arg#*=}
			;;
		--cchost=*)
			mb_cchost=${arg#*=}
			;;
		--cfghost=*)
			mb_cfghost=${arg#*=}
			;;
		--target=*)
			mb_target=${arg#*=}
			;;
		--arch=*)
			mb_arch=${arg#*=}
			;;
		--sysroot=*)
			mb_sysroot=${arg#*=}
			;;
		--shell=*)
			mb_shell=${arg#*=}
			;;
		--debug)
			mb_debug=yes
			;;

		# config
		--all-static)
			mb_all_static=yes
			mb_all_shared=no
			;;
		--all-shared)
			mb_all_shared=yes
			mb_all_static=no
			;;
		--disable-frontend)
			mb_disable_frontend=yes
			;;
		--disable-app)
			mb_disable_frontend=yes
			;;
		--enable-frontend)
			mb_disable_frontend='no'
			;;
		--enable-app)
			mb_disable_frontend='no'
			;;
		--disable-static)
			mb_disable_static=yes
			;;
		--disable-shared)
			mb_disable_shared=yes
			;;
		--enable-static)
			mb_disable_static='no'
			;;
		--enable-shared)
			mb_disable_shared='no'
			;;

		# convenience
		--strict)
			mb_ccstrict=yes
			mb_ldstrict=yes
			;;
		--ccstrict)
			mb_ccstrict=yes
			;;
		--ldstrict)
			mb_ldstrict=yes
			;;

		# project
		--nickname=*)
			mb_nickname=${arg#*=}
			;;
		--program-prefix=*)
			mb_program_prefix=${arg#*=}
			;;
		--avoid-version)
			mb_avoid_version=yes
			;;
		--source-dir=*)
			mb_source_dir=${arg#*=}
			mb_source_dir_set=yes
			;;
		--srcdir=*)
			mb_source_dir=${arg#*=}
			mb_source_dir_set=yes
			;;

		# pkgconfig
		--pkgname=*)
			mb_pkgname=${arg#*=}
			;;

		--pkgdesc=*)
			mb_pkgdesc=${arg#*=}
			;;

		--pkgusrc=*)
			mb_pkgusrc=${arg#*=}
			;;

		--pkgrepo=*)
			mb_pkgrepo=${arg#*=}
			;;

		--pkgpsrc=*)
			mb_pkgpsrc=${arg#*=}
			;;

		--pkgdurl=*)
			mb_pkgdurl=${arg#*=}
			;;

		--pkgbugs=*)
			mb_pkgbugs=${arg#*=}
			;;

		--pkghome=*)
			mb_pkghome=${arg#*=}
			;;

		--pkgdefs=*)
			mb_pkgdefs=${arg#*=}
			;;

		--pkglibs=*)
			mb_pkglibs=${arg#*=}
			;;

		# srcinfo
		--srcinfo=*)
			mb_srcinfo=${arg#*=}
			;;

		--srcsite=*)
			mb_srcsite=${arg#*=}
			;;

		--pgprkey=*)
			mb_pgprkey=${arg#*=}
			;;

		--pgpskey=*)
			mb_pgpskey=${arg#*=}
			;;

		--rawball=*)
			mb_rawball=${arg#*=}
			;;

		--rawball-url=*)
			mb_rawball_url=${arg#*=}
			;;

		--rawball-sha256=*)
			mb_rawball_sha256=${arg#*=}
			;;

		--modball=*)
			mb_modball=${arg#*=}
			;;

		--modball-url=*)
			mb_modball_url=${arg#*=}
			;;

		--modball-sha256=*)
			mb_modball_sha256=${arg#*=}
			;;

		--srcball=*)
			mb_srcball=${arg#*=}
			;;

		--srcball-url=*)
			mb_srcball_url=${arg#*=}
			;;

		--srcball-sha256=*)
			mb_srcball_sha256=${arg#*=}
			;;

		# compatibility
		--enable-dependency-tracking)
			;;
		--disable-dependency-tracking)
			;;

		*)
			if [ _$mb_use_custom_cfgdefs = _yes ]; then
				mb_escaped_arg=\'$(printf '%s\n' "$arg" | sed -e "s/'/'\\\\''/g")\'
				mb_escaped_arg="$mb_custom_cfgdefs_space$mb_escaped_arg"
				mb_custom_cfgdefs_args="$mb_custom_cfgdefs_args$mb_escaped_arg"
				mb_custom_cfgdefs_space=' '
			else
				error_msg ${arg#}: "unsupported config argument."
				exit 2
			fi
			;;
	esac

	mb_safe_path_desc='source directory'
	mb_safe_path_name="$mb_source_dir"
	verify_safe_path
done



# three: validation
verify_source_directory
verify_source_info

if ! [ -z "$mb_program_prefix" ]; then
	error_msg "--program-prefix is not yet fully support (must be null)."
fi



# four: defaults
common_defaults


# five: config
config_flags
config_opts
config_copy
config_ccenv
config_custom
config_cfghost
config_host
config_fini
config_status


# all done
config_success