#!/bin/sh

# we are no longer lazy.

# this script respects both CFLAGS and CFLAGS_CMDLINE,

# as well as both LDFLAGS and LDFLAGS_CMDLINE, however

# the latter variable of each pair should be preferred.

error_msg()

{

	echo $@ >&2

}

init_vars()

{

	mb_project_dir=$(cd `dirname $0` ; pwd)

	mb_pwd=`pwd`

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

		. $mb_project_dir/config.project || exit 2

	else

		. "$mb_config" || exit 2

	fi

	# dirs

	mb_prefix=$PREFIX

	mb_bindir=$BINDIR

	mb_libdir=$LIBDIR

	mb_includedir=$INCLUDEDIR

	mb_syslibdir=$LIBDIR

	mb_mandir=$MANDIR

	mb_docdir=$DOCDIR

	mb_libexecdir=$LIBEXECDIR

	# build

	mb_build=$BUILD

	mb_host=$HOST

	mb_target=$TARGET

	mb_arch=$ARCH

	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_path=$CFLAGS_PATH

	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_pe_subsystem=$PE_SUBSYSTEM

	mb_pe_image_base=$PE_IMAGE_BASE

	mb_pe_config_defs=$PE_CONFIG_DEFS

	mb_elf_eh_frame=$ELF_EH_FRAME

	mb_elf_hash_style=$ELF_HASH_STYLE

	mb_elf_config_defs=$ELF_CONFIG_DEFS

	# overrides

	mb_native_cc=$NATIVE_CC

	mb_native_os=$NATIVE_OS

	mb_native_os_bits=$NATIVE_OS_BITS

	mb_native_os_underscore=$NATIVE_OS_UNDERSCORE

}

verify_build_directory()

{

	if [ x"$mb_project_dir" = x"$mb_pwd" ]; then

		if [ x"$mb_require_out_of_tree" = xyes ]; then

			error_msg "$mb_package: out-of-tree builds are required."

			error_msg "please invoke configure again from a clean build directory."

			exit 2

		else

			mb_project_dir='.'

		fi

	fi

}

common_defaults()

{

	# dirs

	[ -z "$mb_prefix" ] 		&& mb_prefix=$mb_default_prefix

	[ -z "$mb_bindir" ] 		&& mb_bindir=$mb_default_bindir

	[ -z "$mb_libdir" ] 		&& mb_libdir=$mb_default_libdir

	[ -z "$mb_includedir" ]		&& mb_includedir=$mb_default_includedir

	[ -z "$mb_syslibdir" ] 		&& mb_syslibdir=$mb_default_syslibdir

	[ -z "$mb_mandir" ] 		&& mb_mandir=$mb_default_mandir

	[ -z "$mb_docdir" ] 		&& mb_docdir=$mb_default_docdir

	[ -z "$mb_libexecdir" ]		&& mb_libexecdir=$mb_default_libexecdir

	# build

	[ -z "$mb_build" ] 		&& mb_build=$mb_default_build

	[ -z "$mb_host" ] 		&& mb_host=$mb_default_host

	[ -z "$mb_target" ] 		&& mb_target=$mb_default_target

	[ -z "$mb_arch" ] 		&& mb_arch=$mb_default_arch

	[ -z "$mb_toolchain" ] 		&& mb_toolchain=$mb_default_toolchain

	[ -z "$mb_sysroot" ] 		&& mb_sysroot=$mb_default_sysroot

	[ -z "$mb_cross_compile" ] 	&& mb_cross_compile=$mb_default_cross_compile

	[ -z "$mb_shell" ] 		&& mb_shell=$mb_default_shell

	# switches

	[ -z "$mb_cflags_debug" ]	&& mb_cflags_debug=$mb_default_cflags_debug

	[ -z "$mb_cflags_common" ]	&& mb_cflags_common=$mb_default_cflags_common

	[ -z "$mb_cflags_cmdline" ]	&& mb_cflags_cmdline=$mb_default_cflags_cmdline

	[ -z "$mb_cflags_config" ]	&& mb_cflags_config=$mb_default_cflags_config

	[ -z "$mb_cflags_sysroot" ]	&& mb_cflags_sysroot=$mb_default_cflags_sysroot

	[ -z "$mb_cflags_path" ]	&& mb_cflags_path=$mb_default_cflags_path

	[ -z "$mb_ldflags_debug" ]	&& mb_ldflags_debug=$mb_default_ldflags_debug

	[ -z "$mb_ldflags_common" ]	&& mb_ldflags_common=$mb_default_ldflags_common

	[ -z "$mb_ldflags_cmdline" ]	&& mb_ldflags_cmdline=$mb_default_ldflags_cmdline

	[ -z "$mb_ldflags_config" ]	&& mb_ldflags_config=$mb_default_ldflags_config

	[ -z "$mb_ldflags_sysroot" ]	&& mb_ldflags_sysroot=$mb_default_ldflags_sysroot

	[ -z "$mb_ldflags_path" ]	&& mb_ldflags_path=$mb_default_ldflags_path

	[ -z "$mb_pe_subsystem" ]	&& mb_pe_subsystem=$mb_default_pe_subsystem

	[ -z "$mb_pe_image_base" ]	&& mb_pe_image_base=$mb_default_pe_image_base

	[ -z "$mb_pe_config_defs" ]	&& mb_pe_config_defs=$mb_default_pe_config_defs

	[ -z "$mb_elf_eh_frame" ]	&& mb_elf_eh_frame=$mb_default_elf_eh_frame

	[ -z "$mb_elf_hash_style" ]	&& mb_elf_hash_style=$mb_default_elf_hash_style

	[ -z "$mb_elf_config_defs" ]	&& mb_elf_config_defs=$mb_default_elf_config_defs

	# host/target

	[ -z "$mb_host" ] 		&& mb_host=$mb_target

	# sysroot

	if [ x"$mb_sysroot" != x ]; then

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

			mb_cflags_sysroot="--sysroot=$mb_sysroot"

		fi

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

			mb_ldflags_sysroot="-Wl,--sysroot,$mb_sysroot"

		fi

	fi

	# debug

	if [ x"$mb_debug" = xyes ]; then

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

			mb_cflags_debug='-g3 -O0'

		fi

	fi

	# toolchain

	if [ x"$mb_toolchain" != x ]; then

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

			mb_native_cc=$mb_toolchain

		fi

	fi

}

native_defaults()

{

	# CC (when set, must be valid)

	if [ x"$CC" != x ]; then

		$CC -dM -E - < /dev/null > /dev/null || exit 2

	fi

	# toolchain

	[ -z "$mb_native_cc" ] && mb_native_cc=$CC

	[ -z "$mb_native_cc" ] && mb_native_cc='cc'

	$mb_native_cc -dM -E - < /dev/null > /dev/null 2>/dev/null || mb_native_cc=

	[ -z "$mb_native_cc" ] && mb_native_cc='gcc'

	$mb_native_cc -dM -E - < /dev/null > /dev/null 2>/dev/null || mb_native_cc=

	[ -z "$mb_native_cc" ] && mb_native_cc='clang'

	$mb_native_cc -dM -E - < /dev/null > /dev/null 2>/dev/null || mb_native_cc=

	[ -z "$mb_native_cc" ] && mb_native_cc='cparser'

	$mb_native_cc -dM -E - < /dev/null > /dev/null 2>/dev/null || mb_native_cc=

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

		error_msg "config error: could not find a working native compiler."

		exit 2

	fi

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

		$mb_native_cc -dM -E - < /dev/null | grep '__clang__' > /dev/null && mb_toolchain='clang'

	fi

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

		$mb_native_cc -dM -E - < /dev/null | grep '__GCC' > /dev/null && mb_toolchain='gcc'

	fi

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

		$mb_native_cc -dM -E - < /dev/null | grep '__CPARSER__' > /dev/null && mb_toolchain='cparser'

	fi

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

		error_msg "config error: could not identify the native compiler."

		exit 2

	fi

	# host

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

		mb_host='native'

	fi

	# os

	mb_native_os=`uname | tr '[:upper:]' '[:lower:]'`

	mb_native_os_sizeof_pointer=`$mb_native_cc -dM -E - < /dev/null \

			| grep __SIZEOF_POINTER__  \

			| cut -d ' ' -f3`

	mb_native_os_bits=`expr '8' '*' '0'"$mb_native_os_sizeof_pointer"`

	if [ $mb_native_os_bits = 32 ]; then

		mb_native_os_underscore='_'

	else

		mb_native_os_underscore=''

	fi

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

		error_msg "config error: could not determine size of pointer on native system."

		exit 2

	fi

	[ -z "$mb_native_os" ] 			&& mb_native_os=$mb_native_os

	[ -z "$mb_native_os_bits" ] 		&& mb_native_os_bits=$mb_native_os_bits

	[ -z "$mb_native_os_underscore" ]	&& mb_native_os_underscore=$mb_native_os_underscore

}

cross_defaults()

{

	if [ x"$mb_cross_compile" = x ] && [ x"$mb_host" != xnative ]; then

		mb_cross_compile=$mb_host'-'

	fi

}

config_copy()

{

	sed 		-e 's^@package@^'"$mb_package"'^g' 				\

			-e 's^@project_dir@^'"$mb_project_dir"'^g'			\

											\

			-e 's^@build@^'"$mb_build"'^g'					\

			-e 's^@host@^'"$mb_host"'^g'					\

			-e 's^@target@^'"$mb_target"'^g'				\

			-e 's^@arch@^'"$mb_arch"'^g'					\

			-e 's^@toolchain@^'"$mb_toolchain"'^g'				\

			-e 's^@sysroot@^'"$mb_sysroot"'^g'				\

			-e 's^@cross_compile@^'"$mb_cross_compile"'^g'			\

			-e 's^@shell@^'"$mb_shell"'^g'					\

											\

			-e 's^@cflags@^'"$mb_cflags"'^g'				\

			-e 's^@cflags_debug@^'"$mb_cflags_debug"'^g'			\

			-e 's^@cflags_common@^'"$mb_cflags_common"'^g'			\

			-e 's^@cflags_cmdline@^'"$mb_cflags $mb_cflags_cmdline"'^g'	\

			-e 's^@cflags_config@^'"$mb_cflags_config"'^g'			\

			-e 's^@cflags_sysroot@^'"$mb_cflags_sysroot"'^g'		\

			-e 's^@cflags_path@^'"$mb_cflags_path"'^g'			\

											\

			-e 's^@ldflags@^'"$mb_ldflags"'^g'				\

			-e 's^@ldflags_debug@^'"$mb_ldflags_debug"'^g'			\

			-e 's^@ldflags_common@^'"$mb_ldflags_common"'^g'		\

			-e 's^@ldflags_cmdline@^'"$mb_ldflags $mb_ldflags_cmdline"'^g'	\

			-e 's^@ldflags_config@^'"$mb_ldflags_config"'^g'		\

			-e 's^@ldflags_sysroot@^'"$mb_ldflags_sysroot"'^g'		\

			-e 's^@ldflags_path@^'"$mb_ldflags_path"'^g'			\

											\

			-e 's^@pe_subsystem@^'"$mb_pe_subsystem"'^g'			\

			-e 's^@pe_image\_base@^'"$mb_pe_image_base"'^g'			\

			-e 's^@pe_config\_defs@^'"$mb_pe_config_defs"'^g'		\

											\

			-e 's^@elf_eh\_frame@^'"$mb_elf_eh_frame"'^g'			\

			-e 's^@elf_hash\_style@^'"$mb_elf_hash_style"'^g'		\

			-e 's^@elf_config\_defs@^'"$mb_elf_config_defs"'^g'		\

											\

			-e 's^@prefix@^'"$mb_prefix"'^g'				\

			-e 's^@bindir@^'"$mb_bindir"'^g'				\

			-e 's^@libdir@^'"$mb_libdir"'^g'				\

			-e 's^@includedir@^'"$mb_includedir"'^g'			\

			-e 's^@syslibdir@^'"$mb_syslibdir"'^g'				\

			-e 's^@mandir@^'"$mb_mandir"'^g'				\

			-e 's^@docdir@^'"$mb_docdir"'^g'				\

			-e 's^@libexecdir@^'"$mb_libexecdir"'^g'			\

											\

			-e 's^@native_cc@^'"$mb_native_cc"'^g'				\

			-e 's^@native_os@^'"$mb_native_os"'^g'				\

			-e 's^@native_os_bits@^'"$mb_native_os_bits"'^g'			\

			-e 's^@native_os_underscore@^'"$mb_native_os_underscore"'^g'	\

		$mb_project_dir/Makefile.in > $mb_pwd/Makefile

}

config_host()

{

	make host.tag && return 0

	error_msg "configure was able to generate a Makefile for the selected host,"

	error_msg "however the host-targeting toolchain was found to be missing"

	error_msg "at least one of the required headers or features."

	exit 2

}

config_status()

{

	printf "\n\n"

	make .display

	printf "\nconfiguration completed successfully.\n\n"

}

# one: init

init_vars

verify_build_directory

# two: args

for arg ; do

	case "$arg" in

		--help)	usage

			;;

		# dirs

		--prefix=*)

			mb_prefix=${arg#*=}

			;;

		--bindir=*)

			mb_bindir=${arg#*=}

			;;

		--libdir=*)

			mb_libdir=${arg#*=}

			;;

		--includedir=*)

			mb_includedir=${arg#*=}

			;;

		--syslibdir=*)

			mb_syslibdir=${arg#*=}

			;;

		--mandir=*)

			mb_mandir=${arg#*=}

			;;

		--libexecdir=*)

			mb_libexecdir=${arg#*=}

			;;

		# build

		--build=*)

			mb_build=${arg#*=}

			;;

		--host=*)

			mb_host=${arg#*=}

			;;

		--target=*)

			mb_target=${arg#*=}

			;;

		--arch=*)

			mb_arch=${arg#*=}

			;;

		--toolchain=*)

			mb_toolchain=${arg#*=}

			;;

		--sysroot=*)

			mb_sysroot=${arg#*=}

			;;

		--cross-compile=*)

			mb_cross_compile=${arg#*=}

			;;

		--shell=*)

			mb_shell=${arg#*=}

			;;

		--debug)

			mb_debug='yes'

			;;

		*)

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

			exit 2

			;;

	esac

done

# three: defaults

common_defaults

native_defaults

cross_defaults

# four: config

config_copy

config_host

config_status

# all done

exit 0