#!/bin/bash
# Copyright 1999-2003 Gentoo Technologies, Inc.
# Distributed under the terms of the GNU General Public License, v2 or later
# $Header: /home/cvsroot/gentoo-x86/sys-devel/gcc-config/files/gcc-config-1.4.1,v 1.1 2003/04/06 22:18:42 zwelch Exp $

# Original Author: Martin Schlemmer <azarah@gentoo.org>
# Present Maintainter: Zach Welch <zwelch@gentoo.org>
# Cross-compiling toolchain contributions by: 
#   Zach Welch <zwelch@gentoo.org> and James Boddington <aiken@gentoo.org>
# Other contributions listed in ChangeLog

source /etc/init.d/functions.sh || {
	echo "$0: Could not source /etc/init.d/functions.sh!"
	exit 1
}

GCCC_VERBOSE=1
GCCC_PRETEND=""

gccc_echo() {
	[ -z "${GCCC_QUIET}" -a -n "${GCCC_VERBOSE}" ] && echo "$*"
}

die() {
	eerror "$*"
	exit 1
}

usage() {
cat << "USAGE_END"
Usage: gcc-config [Option] [CC Profile]
gcc-config version @VERSION@
Change the current cc/gcc profile, or give info about profiles.

Options:

  -O, --use-old
                         Use the old profile if one was selected.
	
  -P, --use-portage-chost
                         Only set to given profile if its CHOST is the same
                         as that set for portage in /etc/make.conf (or one of
                         other portage config files...).
	
  -c, --get-current-profile
                         Print current used gcc profile for (optional) CHOST.

  -l, --list-profiles
                         Print a list of available profiles.

  -E, --print-environ
                         Print environment that can be used to setup things
                         for current gcc profile, or specified one ...
	
  -B, --get-bin-path
                         Print path where binaries of given/current profile
                         are located.
	
  -L, --get-lib-path
                         Print path where libraries of given/current profile
                         are located.

  -X, --get-stdcxx-incdir
                         Print path to g++ include files of given/current
                         profile.
  
  --install-toolchain
                         Install a new cross-compiling toolchain (that does
                         not appear in the list of available profiles)
                         and create the specified profile.
  --remove-toolchain
                         Remove a cross-compiling toolchain.

The profile name is in the form of:

  <CHOST>-<gcc version>

For example:

  i686-pc-linux-gnu-3.2.2


USAGE_END

	exit 1
}

if [ "$#" -lt 1 ]
then
	usage
fi

HAVE_WHICH="no"
if [ -n "$(which which 2> /dev/null)" ]
then
	HAVE_WHICH="yes"
fi

CC_COMP=""
CC_HOST=""
CC_VERS=""


find_path() {
	[ -z "$1" ] && return 0

	if [ "${HAVE_WHICH}" = "yes" ]
	then
		local fullpath="$(which $1 2> /dev/null)"
		
		if [ -x "${fullpath}" ]
		then
			echo "${fullpath}"
			return 0
		fi
	fi

	for x in /bin /sbin /usr/bin /usr/sbin \
		/usr/local/bin /usr/local/sbin
	do
		if [ -x "${x}/$1" -a -r "${x}/$1" ]
		then
			echo "${x}/$1"
			return 0
		fi
	done

	return 0
}

EMERGE="$(find_path emerge)"

cmd_setup() {

	# Sourcing /etc/env.d/gcc/${CC_COMP} is going to mess up
	# PATH among things...
	CP="$(find_path cp)"
	RM="$(find_path rm)"
	MV="$(find_path mv)"
	LN="$(find_path ln)"
	CAT="$(find_path cat)"
	AWK="$(find_path gawk)"
	GREP="$(find_path grep)"
	FIND="$(find_path find)"
	CHMOD="$(find_path chmod)"
	TOUCH="$(find_path touch)"
	ENV_UPDATE="$(find_path env-update)"
}


get_portage_dirs() {
	PORTDIR="$(portageq portdir 2>/dev/null)"
	PORTDIR_OVERLAY="$(portageq portdir_overlay 2>/dev/null)"
}

# ===============================================================

CC_ARCH=""
get_arch()

{
	[ -n "${CC_ARCH}" ] && return 0
	CC_ARCH="$(echo ${CC_HOST} | awk -F '-' '{print $1}' | \
		sed -e 's/arm.*/arm/;s/powerpc/ppc/')"
	[ -n "${CC_ARCH}" ] || die "unable to determine CC_ARCH"
}


REAL_CHOST=""
get_real_chost() {
	[ -n "${REAL_CHOST}" ] && return 0

	# CBUILD is our real 'native' CHOST
	REAL_CHOST="$(portageq envvar CBUILD 2>/dev/null)"
	[ -n "${REAL_CHOST}" ] && return 0

	# but portage has CHOST confused with CBUILD 
	REAL_CHOST="$(portageq envvar CHOST 2>/dev/null)"
	[ -n "${REAL_CHOST}" ] && return 0

	die "$0:  Could not get portage CBUILD or CHOST!"
}

is_native_config() {
	[ -z "${REAL_CHOST}" ] && get_real_chost
	[ -z "${CC_HOST}" -o "${CC_HOST}" = "${REAL_CHOST}" ]
}

get_config_filename() {
	is_native_config && \
		echo "config" || \
		echo "config-${CC_HOST}"
}

# ===============================================================

USER_ID=""
is_super_user() {
	if [ -z "${USER_ID}" ]; then
		USER_ID="$(id -u)"
		[ -z "${USER_ID}" ] && die "Unable to get user id"
	fi
	[ "${USER_ID}" -eq 0 ]
}
USER_NAME=""
get_user_name() {
	if [ -z "${USER_NAME}" ]; then
		USER_NAME="$(id -un)"
		[ -z "${USER_NAME}" ] && die "Unable to get user name"
	fi
	echo "${USER_NAME}"
}
USER_HOME=""
get_user_home_dir() {
	[ -z "${USER_HOME}" ] && \
		USER_HOME="${HOME}"
	[ -z "${USER_HOME}" ] && die "\${HOME} is not set"
	echo "${USER_HOME}"
}
USER_CONF_DIR=""
get_user_config_dir() {
	[ -z "${USER_CONF_DIR}" ] && \
		USER_CONF_DIR="$(get_user_home_dir)/.gcc-config"
	echo "${USER_CONF_DIR}"
}
USER_CONFIG=""
get_user_config_file() {
	[ -z "${USER_CONFIG}" ] && \
		USER_CONFIG="$(get_user_config_dir)/$(get_config_filename)"
	echo "${USER_CONFIG}"
}
USER_ENV_FILE=""
get_user_env_file() {
	[ -z "${USER_ENV_FILE}" ] && \
		USER_ENV_FILE="$(get_user_home_dir)/.gcc-current"
	echo "${USER_ENV_FILE}"
}
# ===============================================================

GCCC_ENVD="/etc/env.d"
GCCC_CONFD="/etc/env.d/gcc"

get_sys_config_dir() {
	echo "${GCCC_CONFD}"
}
SYS_CONFIG=""
get_sys_config_file() {
	[ -z "${SYS_CONFIG}" ] && \
		SYS_CONFIG="$(get_sys_config_dir)/$(get_config_filename)"
	echo "${SYS_CONFIG}"
}
get_sys_env_file() {
	# root affects the whole system
	echo "${GCCC_ENVD}/05gcc"
}

# ===============================================================
# config file hackery - we might do better with sub-shell sourcing
get_var_from_config() {
	awk -F'=' '/^'"${1}"'=['\''"]?([^"'\'']*)['\''"]?$/ { print $2 }' ${2} |
		sed 's,^["'\'']\([^"'\'']*\)["'\'']$,\1,'
}
get_current_from_config() {
	get_var_from_config 'CURRENT' "${1}"
}

# ===============================================================
# the following functions manage the distcc symlinks
#  they allow the user or other scripts (namely gcc-config) to
#  automatically update distcc's links when upgrading toolchains
#
gccc_remove_link() {
	local t="/usr/bin/${1}"
	if [ -f ${t} ]; then
		gccc_echo "Removing ${t}..."
		rm -f "${t}"
	fi
}
gccc_install_link() {
	# first be sure any old link is removed
	GCCC_VERBOSE="" gccc_remove_link "${1}"

	# then create the new link
	local t="/usr/bin/${1}"
	gccc_echo "Installing wrapper: ${t}..."
	cp -f /usr/lib/gcc-config/wrapper "${t}"
}

# gccc_update_links {install,remove} [CHOST]
gccc_links() {
	local a
	for a in gcc cc c++ g++ ; do
		[ -n "${2}" ] && a="${2}-${a}"
		eval "gccc_${1}_link" "${a}"
	done
	# now update distcc and ccache's wrappers using their scripts
	[ -x /usr/bin/distcc-config ] && \
		DCCC_QUIET=1 /usr/bin/distcc-config "--${1}-links" ${2}
	[ -x /usr/bin/ccache-config ] && \
		CC_QUIET=1 /usr/bin/ccache-config "--${1}-links" ${2}
}

install_wrappers() {
	rm -f /lib/cpp && cp -f /usr/lib/gcc-config/wrapper /lib/cpp
	is_native_config && gccc_links 'install'
	gccc_links 'install' "${CC_HOST}"
}

remove_wrappers() {
	rm -f /lib/cpp
	is_native_config && gccc_links 'remove'
	gccc_links 'remove' "${CC_HOST}"
}

# ===============================================================

check_config_file() {
	local CONFIG=""
	if ! is_super_user; then
		CONFIG="$(get_user_config_dir)/${1}"
		[ -r "${CONFIG}" ] || CONFIG=""
	fi
	[ -z "${CONFIG}" ] && CONFIG="${GCCC_CONFD}/${1}"
	[ -r "${CONFIG}" ] || CONFIG=""
	echo "${CONFIG}"
}

# get_all_chosts searches the system config directory for supported CHOSTs 
get_all_chosts() {
	find ${GCCC_CONFD}/* | grep -v config | 
		sed 's,\(.*\)-.*$,\1,;s,^.*/\(.*\),\1,g' | sort -u
}

get_all_configs() {
	local ALL_CONFIGS=""
	local ALL_CHOSTS="$(get_all_chosts)"
	local x

	# add main config file
	ALL_CONFIGS="$(check_config_file 'config')"
	get_real_chost
	eval "ALL_CHOSTS=\${ALL_CHOSTS/${REAL_CHOST}}"

	# add remaining config files 
	local CONFIG CONFIGNAME
	for x in ${ALL_CHOSTS}; do
		CONFIGNAME="config-${x}"
		CONFIG="$(check_config_file ${CONFIGNAME})"
		[ -z "${CONFIG}" ] && continue
		ALL_CONFIGS="${ALL_CONFIGS} ${CONFIG}"
	done

	echo "${ALL_CONFIGS}"
}

get_gccc_profiles() {
	local GCCC_PROFILES=""
	local ALL_CURRENT=""
	local CURRENT
	local x

	ALL_CURRENT="$(awk -F'=' '{ print $2 }' $(get_all_configs))"

	for CURRENT in ${ALL_CURRENT}; do
	#	CURRENT="$(get_current_from_config ${x})"
		[ -z "${GCCC_PROFILES}" ] && \
			GCCC_PROFILES="${CURRENT}" || \
			GCCC_PROFILES="${GCCC_PROFILES}:${CURRENT}"
		
	done
	[ -n "${GCCC_PROFILES}" ] || die "$0: no active profiles available!"
	echo "${GCCC_PROFILES}"
}

# ===============================================================

switch_profile() 
{
	# print nice messege to the user
	local CC_WHO=""
	is_super_user && \
		CC_WHO="settings for $(get_user_name)" || \
		CC_WHO="system default settings"

	local CC_TYPE=""
	is_native_config && \
		CC_TYPE="native compilers to ${CC_COMP}" || \
		CC_TYPE="${CC_HOST} cross-compilers to ${CC_VERS}"

	ebegin "Switching ${CC_WHO} for ${CC_TYPE}"

	# locate system (and user) gcc-config settings directories
	local SYS_CONFIG_DIR="$(get_sys_config_dir)"
	local CONFIG_DIR="" 
	is_super_user && \
		CONFIG_DIR="${SYS_CONFIG_DIR}" || \
		CONFIG_DIR="$(get_user_config_dir)"
	mkdir -p "${CONFIG_DIR}" || die "$0: can't create ${CONFIG_DIR}"

	# locate sytem (and user) environment file(s)
	local SYS_ENV_FILE="$(get_sys_env_file)"
	local ENV_FILE=""
	is_super_user && \
		ENV_FILE="${SYS_ENV_FILE}" || \
		ENV_FILE="$(get_user_env_file)"

	# locate system (and user) configuration file(s)
	local OLD_CC_COMP=""
	local SYS_CONFIG="$(get_sys_config_file)"
	local CONFIG=""
	is_super_user && \
		CONFIG="${SYS_CONFIG}" || \
		CONFIG="$(get_user_config_file)"

	# locate old config for this CC_HOST
	[ -r ${CONFIG} ] && OLD_CC_COMP="$(get_current_from_config ${CONFIG})"
	if [ -z "${OLD_CC_COMP}" -a "${CONFIG}" != "${SYS_CONFIG}" ]; then
		[ -r ${SYS_CONFIG} ] && 
			OLD_CC_COMP="$(get_current_from_config ${SYS_CONFIG})"
	fi

	# Order our profiles to have the active profile first...
	# We do this so that we can have them ordered with default
	# first in /etc/ld.so.conf, as the logical is that all
	# compilers for default CHOST will be used to compile stuff,
	# and thus we want all their lib paths in /etc/ld.so.conf ...
	local GCC_PROFILES=""
	GCC_PROFILES="$(find ${GCCC_CONFD}/ -name "${CC_HOST}-*")"
	GCC_PROFILES="${GCC_PROFILES/\/etc\/env.d\/gcc\/${CC_COMP}}"
	GCC_PROFILES="${GCCC_CONFD}/${CC_COMP} ${GCC_PROFILES}"

	# Extract all LDPATH's for our CHOST
	local MY_LDPATH=""
	local PROFILE_LDPATH=""
	for x in ${GCC_PROFILES}
	do
		if [ -f "${x}" ]
		then
			PROFILE_LDPATH="$(get_var_from_config 'LDPATH' ${x})"
			if [ -z "${PROFILE_LDPATH}" ]; then
				ewarn "\${LDPATH} not found in ${x}"
				continue
			fi
			if [ ! -d "${PROFILE_LDPATH}" ]; then 
				ewarn "${LDPATH} in ${x} cannot be found"
				continue
			fi
			[ -z "${MY_LDPATH}" ] && \
				MY_LDPATH="${PROFILE_LDPATH}" || \
				MY_LDPATH="${MY_LDPATH}:${PROFILE_LDPATH}"
		fi
	done

	# Setup our profile config file
	echo "CURRENT=${CC_COMP}" > ${SYS_CONFIG} || die

	# Setup environment file
	rm -f "${ENV_FILE}"
	{
		# Copy most of the spec file intact
		#   skip PATH, LDPATH, and STDCXX_INCDIR
		awk '!/^PATH=|^LDPATH=|^STDCXX_INCDIR=/ {print $0}' \
			"${GCCC_CONFD}/${CC_COMP}" &&

		# Add our custom LDPATH -- not anymore - wild any crazy
#		echo "LDPATH=\"${MY_LDPATH}\"" &&

		# Make sure we do not recreate /lib/cpp and /usr/bin/cc ...
#		echo "DISABLE_GEN_GCC_WRAPPERS=\"yes\"" >> ${ENV_FILE}

		# set GCCC_PROFILES for per-session support
		echo "GCCC_PROFILES=$(get_gccc_profiles)" 
	} > ${ENV_FILE} || die "Unable to create ${ENV_FILE}"

	if is_super_user; then
		# These might not be installed, and we want to update the mtime
		# for ccache and distcc anyhow ... (ztw - ?!?)
		# update main linkes
		GCCC_QUIET=1 install_wrappers

		/usr/sbin/env-update &> /dev/null
	fi

	eend 0

	if [ "${OLD_CC_COMP}" != "${CC_COMP}" ]
	then
		echo
		ewarn "If you intend to use the gcc from the new profile in an already"
		ewarn "running shell, please remember to do the following:"
		echo
		ewarn "  # source /etc/profile"
		echo
	fi

	return 0
}

get_current_profile() {
	
	local SYS_CONFIG="$(get_sys_config_file)"
	local CURRENT=""
	local CONFIG=""

	is_super_user && \
		CONFIG="${SYS_CONFIG}" || \
		CONFIG="$(get_user_config_file)"

	# locate config for this CC_HOST
	[ -r ${CONFIG} ] && \
		CURRENT="$(get_current_from_config ${CONFIG})"
	if [ -z "${CURRENT}" -a "${CONFIG}" != "${SYS_CONFIG}" ]; then
		[ -r ${SYS_CONFIG} ] && 
			CURRENT="$(get_current_from_config ${SYS_CONFIG})"
	fi
	
	[ -z "${CURRENT}" ] && die "$0:  No gcc profile is active!"
	echo "${CURRENT}"

	return 0
}


list_profiles() {
	local i=1
	if [ ! -f /etc/env.d/gcc/config ]
	then
		eerror "$0:  No gcc profile is active!"
		return 1
	fi

	for x in /etc/env.d/gcc/*
	do
		if [ -f "${x}" -a "${x}" = "${x/config}" ]
		then
			echo "[${i}] ${x##*/}"
			i=$((i + 1))
		fi
	done
}

print_environ() {
	local NEWPATH
	local NEWCC
	local NEWCXX

	NEWPATH="$(get_var_from_config 'PATH' ${GCCC_CONFD}/${CC_COMP})"
	NEWCC="$(get_var_from_config 'CC' ${GCCC_CONFD}/${CC_COMP})"
	NEWCXX="$(get_var_from_config 'CXX' ${GCCC_CONFD}/${CC_COMP})"

	echo "export PATH=\"${NEWPATH}:${PATH}\""

#	if [ -z "${LD_LIBRARY_PATH}" ]
#	then
#		echo "export LD_LIBRARY_PATH=\"${LDPATH}\""
#	else
#		echo "export LD_LIBRARY_PATH=\"${LDPATH}:${LD_LIBRARY_PATH}\""
#	fi

	echo "export CC=\"${NEWCC}\""
	echo "export CXX=\"${NEWCXX}\""
}

get_bin_path() {
	echo "$(get_var_from_config 'PATH' ${GCCC_CONFD}/${CC_COMP})"
	return 0
}

get_lib_path() {
	echo "$(get_var_from_config 'LDPATH' ${GCCC_CONFD}/${CC_COMP})"
	return 0
}

get_stdcxx_incdir() {
	local PTH DIR
	PTH="$(get_lib_path)"
	[ -z "${PTH}" ] && die "$0: unable to get LDPATH for ${CC_COMP}"
	DIR="$(get_var_from_config 'STDCXX_INCDIR' ${GCCC_CONFD}/${CC_COMP})"
	echo "${PTH}/include/${DIR}"
	return 0
}

# ===============================================================
#  cross-compiler install portions

install_toolchain() {
	local CC_DIR PCC_DIR
	
	is_super_user || \
		die "You must be root to install a new toolchain."

	is_native_config && \
		die "gcc-config should not be used to build a native toolchain"

	get_portage_dirs
	[ -z "${PORTDIR_OVERLAY}" ] && die "PORTDIR_OVERLAY must be defnied"

	[ -f "/etc/env.d/gcc/${CC_COMP}" -a -z "${FORCE_INSTALL}" ] && \
		die "Toolchain is already installed, use --force"
	
	ebegin "Installing cross-compiling toolchain for ${CC_HOST}-${CC_VERS}"

	get_arch
	CC_DIR="arch-${CC_HOST}"
	CC_HDRS="${CC_ARCH}"
	einfo "Looking for ${CC_ARCH}-headers..."
	[ ! -d "${PORTDIR}/sys-kernel/${CC_ARCH}-headers" -a \
	  ! -d "${PORTDIR_OVERLAY}/sys-kernel/${CC_ARCH}-headers" ] && \
	  	CC_HDRS="linux"
	einfo "Using ${CC_HDRS}-headers..."

	# create the portage arch directory, if it doesn't exist
	#  YES!! - WE KNOW THIS IS A TERRIBLE HACK -- IT'S UNFORTUNATE!!!
	PCC_DIR="${PORTDIR_OVERLAY}/${CC_DIR}"
	if [ ! -d "${PCC_DIR}" ]; then
		einfo "Creating ${PCC_DIR} symlinks..."
		mkdir "${PCC_DIR}" || die "Can't create ${PCC_DIR}"
		( cd "${PCC_DIR}" && 
		  local x
		  for x in 'sys-devel/binutils' 'sys-devel/gcc' \
		  	'sys-libs/glibc' "sys-kernel/${CC_HDRS}-headers"
		  do
		  	[ -d "${PORTDIR_OVERLAY}/${x}" ] && \
				ln -s "${PORTDIR_OVERLAY}/${x}" || \
				ln -s "${PORTDIR}/${x}"
		  done 
		  ) || die "$0: Unable to create symlinks in ${PCC_DIR}"
	fi

	ACCEPT_KEYWORDS="${CC_ARCH}" ARCH="${CC_ARCH}" CCHOST="${CC_HOST}" \
		USE="build ${CC_ARCH}" ${EMERGE} \
			"${CC_DIR}/binutils" "${CC_DIR}/${CC_HDRS}-headers" \
			">=${CC_DIR}/gcc-${CC_VERS}*" || \
			die "$0: Unable to merge cross toolchain for ${CC_HOST}"
	if [ -z "${GCCC_PRETEND}" ]; then
		# install wrappers to get /usr/bin/${CC_HOST}-gcc
		gccc_links 'install' "${CC_HOST}"
	
		# set the default version of the system 
		echo "CURRENT=${CC_COMP}" > "$(get_sys_config_file)"
	fi

	ACCEPT_KEYWORDS="${CC_ARCH}" ARCH="${CC_ARCH}" CCHOST="${CC_HOST}" \
		USE="-nls build ${CC_ARCH}" ${EMERGE} "${CC_DIR}/glibc" || \
			die "$0: Unable to merge cross toolchain for ${CC_HOST}"

	ACCEPT_KEYWORDS="${CC_ARCH}" CCHOST="${CC_HOST}" ARCH="${CC_ARCH}" \
		USE="${CC_ARCH}" ${EMERGE} \
			">=${CC_DIR}/gcc-${CC_VERS}*" || \
			die "$0: Unable to merge cross toolchain for ${CC_HOST}"

	if [ -z "${GCCC_PRETEND}" ]; then
		# reinstall wrappers to get new languages
		gccc_links 'install' "${CC_HOST}"
	fi

	eend 0
}

remove_toolchain()
{
	get_arch

	local CC_DIR="arch-${CC_HOST}"
	local CC_HDRS
	local CC_PKGS

	is_super_user || \
		die "You must be root to remove a toolchain."

	is_native_config && \
		die "gcc-config should not be used to remove a native toolchain!! ARE YOU INSANE?!?!"

	get_portage_dirs
	[ -z "${PORTDIR_OVERLAY}" ] && 
		die "PORTDIR_OVERLAY must be defnied"

	# the presense of the arch-ARCH dir in the overlay is used
	# to tell if the 
	if [ ! -d ${PORTDIR_OVERLAY}/${CC_DIR} ]; then
		echo A compiler for $1 is not installed
		return
	fi

	# set CC_HDRS for the appropriate arch headers (or not)
	#  then build the list of packages to unmerge
	[ -d "${PORTDIR_OVERLAY}/${CC_DIR}/${CC_ARCH}-headers" ] && \
		CC_HDRS="${CC_ARCH}" || \
		CC_HDRS="linux"
	CC_PKGS="${CC_DIR}/binutils ${CC_DIR}/${CC_HDRS}-headers \
		${CC_DIR}/glibc ${CC_DIR}/gcc"

	# unmerge the specified packages
	ACCEPT_KEYWORDS="${CC_ARCH}" ARCH="${CC_ARCH}" CCHOST=${1} \
		${EMERGE} unmerge ${CC_PKGS} || \
			ewarn "$0: Errors unmerging parts of the toolchain..."

	# and remove the arch directory
	#  BUG BUG -- should only be removed if *last* version is unmerged
	if [ -z "${GCCC_PRETEND}" ]; then
		gccc_links 'remove' "${CC_HOST}"
		local x i
		for i in ${CC_PKGS}; do
			x="${PORTDIR_OVERLAY}/${i}"
			[ -L "${x}" ] && rm -f "${x}"
		done
		rmdir "${PORTDIR_OVERLAY}/${CC_DIR}"
	fi
}

# ===============================================================
#  Main program begins here


NEED_ACTION="yes"
DOIT="switch_profile"
CHECK_CHOST="no"

check_cc_comp() {
	if [ -n "`echo ${x} | gawk '/^[[:digit:]]*$/ { print }'`" ]
	then
		local i=1
		for y in /etc/env.d/gcc/*
		do
			# skip configuration files
			[ "${y/config}" != "${y}" ] && continue

			if [ -f "${y}" -a "${x}" -eq "${i}" ]
			then
				CC_COMP="${y##*/}"
				break
			else
				i=$((i + 1))
			fi
		done
	else
		CC_COMP="${x}"
	fi
}

check_action() {
	if [ "${NEED_ACTION}" = "yes" ]
	then
		NEED_ACTION="no"
		DOIT="${1}"
	else
		echo "${1} ignored due to previous ${DOIT}"
	fi
}

for x in $*
do
	case "${x}" in
		# Only use specified compiler if one is not already selected.
		-O|--use-old)
			if get_current_profile &> /dev/null
			then
				CC_COMP="$(get_current_profile)"
			fi
			;;
		-P|--use-portage-chost)
			CHECK_CHOST="yes"
			;;
		-c|--get-current-profile)
			check_action get_current_profile
			;;
		-A|--get-all-profiles)
			check_action get_all_profiles
			;;
		-l|--list-profiles)
			check_action list_profiles
			;;
		-E|--print-environ)
			check_action print_environ
			;;
		-B|--get-bin-path)
			check_action get_bin_path
			;;
		-L|--get-lib-path)
			check_action get_lib_path
			;;
		-X|--get-stdcxx-incdir)
			check_action get_stdcxx_incdir
			;;
		-G|--get-gccc-profiles)
			check_action get_gccc_profiles	
			;;
		--install-wrappers)
			check_action install_wrappers
			;;
		--remove-wrappers)
			check_action remove_wrappers
			;;
		--install-toolchain)
			check_action install_toolchain
			;;
		--remove-toolchain)
			check_action remove_toolchain
			;;
		-p|--pretend)
			GCCC_PRETEND=1
			EMERGE="${EMERGE} -vp"
			;;
		--force)
			FORCE_INSTALL=1
			;;
		-*)
			eerror "$0: Unknown switch: ${x}\n  Run $0 without parameters for help."
			exit 1
			;;
		*)
			if [ -z "${CC_COMP}" ]
			then
				check_cc_comp "${x}"
			fi
	esac
done

if [ \( "${DOIT}" = "install_toolchain" -o \
        "${DOIT}" = "switch_profile" \) -a \
     -z "${CC_COMP}" ]
then
	usage
fi

# if no CC_COMP was specified, default to the current native profile
if [ -z "${CC_COMP}" ]
then
	if ! get_current_profile &> /dev/null
	then
		die "$0: No default profile setup!"
	fi
	CC_COMP="$(get_current_profile)"
fi

split_cc_comp() {
	# split CC_COMP into its component parts
	CC_HOST="${CC_COMP%-*}"
	CC_VERS="${CC_COMP##*-}"

	if [ -z "${CC_HOST}" -o -z "${CC_VERS}" -o \
		-z "$(echo ${CC_HOST} | awk -F'-' '{ print $4 }')" ]; then 
		die "${CC_COMP} does not appear to be a valid specification"
	fi
	return 0
}

check_cc_comp_exists() {
	split_cc_comp
	if [ ! -d "/usr/lib/gcc-lib/${CC_HOST}/${CC_VERS}" -o \
	     !  -f "/etc/env.d/gcc/${CC_COMP}" ]
	then
		die "$0: Profile does not exist!"
	fi
	return 0
}

get_cc_comp_from_config() {
	CC_COMP="$(get_var_from_config 'CURRENT' ${1})"
	[ -z "${CC_COMP}" ] && die "$0: unable to find CURRENT in ${1}"
	split_cc_comp
}
check_chost_exists() {
	[ ! -d "/usr/lib/gcc-lib/${CC_COMP}" ] && return 1
	CC_HOST="${CC_COMP}"
	is_super_user         || CC_CONFIG="$(get_user_config_file)"
	[ -r "${CC_CONFIG}" ] || CC_CONFIG="$(get_sys_config_file)"
	[ -r "${CC_CONFIG}" ] || unset CC_HOST
	# if we found a config file
	[ -n "${CC_HOST}" ]  && get_cc_comp_from_config "${CC_CONFIG}"
	# return success if still CC_HOST still set
	[ -n "${CC_HOST}" ]
}
	
case "${DOIT}" in
	install_toolchain|remove_toolchain)
		split_cc_comp
		;;
	install_wrappers|remove_wrappers|get_current_profile|get_bin_path|get_lib_path|get_stdcxx_incdir)
		# user can pass chost or cc_comp
		check_chost_exists || check_cc_comp_exists
		;;
	*)
		check_cc_comp_exists
		;;
esac

if [ "${CHECK_CHOST}" = "yes" ]
then
	# Chosen CHOST are not the same as the real CHOST according to
	# make.conf, and --use-portage-chost option was given, so do nothing
	get_real_chost
	is_native_config || exit 0
fi

eval ${DOIT}

# vim:ts=4