#!/bin/bash
# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# Format of /etc/env.d/gcc/:
#  config-TARGET:	CURRENT=version for TARGET
#  TARGET-VER:		has a TARGET and VER variable

: ${ROOT:=/}
[[ ${ROOT} != */ ]] && ROOT="${ROOT}/"
[[ ${ROOT} != /* ]] && ROOT="${PWD%/}/${ROOT}"

cd /

trap ":" INT QUIT TSTP

argv0=${0##*/}
source /etc/init.d/functions.sh || {
	echo "${argv0}: Could not source /etc/init.d/functions.sh!" 1>&2
	exit 1
}
esyslog() { :; }
has() { [[ " ${*:2} " == *" $1 "* ]]; }
die() { eerror "${argv0}: $*"; exit 1; }
umask 022

# *BSD are plain stupid ... copy a GNU extension but don't just copy it,
# change it so it works differently.  Wish Darwin did selective evolution
# on software developers.
SED=$(type -P gsed)
: ${SED:=$(type -P sed)}

# Further pain: `tac` is not available everywhere #390179
if ! type -P tac >/dev/null ; then
	tac() { ${SED} -e '1!G;h;$!d' "$@" ; }
fi

PV="@PV@"
[[ ${PV} == @*@ ]] && PV="git"
GENTOO_LIBDIR="@GENTOO_LIBDIR@"
[[ ${GENTOO_LIBDIR} == @*@ ]] && GENTOO_LIBDIR="lib"

usage() {
	cat <<-EOF
	Usage: gcc-config [options] [CC Profile]
	Change the current compiler profile, or give info about profiles.

	Options:
	  -C, --nocolor              Disable color output
	  -O, --use-old              Use the old profile if one was selected.
	  -f, --force                Make sure all config files are regenerated.
	  -c, --get-current-profile  Print current used gcc profile.
	  -l, --list-profiles        Print a list of available profiles.
	  -S, --split-profile        Split profiles into their components
	  -E, --print-environ        Print environment that can be used to setup the
	                             current gcc profile, or a specified one.
	  -B, --get-bin-path         Print path where binaries of the given/current
	                             profile are located.
	  -L, --get-lib-path         Print path where libraries of the given/current
	                             profile are located.

	Profile names are of the form:  <CTARGET>-<version>
	For example:                    i686-pc-linux-gnu-3.2.1
	EOF
	exit ${1:-1}
}
[[ $# -lt 1 ]] && usage 1

# Usage: source_var <var> <file> [default value]
source_var() {
	unset $1
	local val=$(source "$2"; echo "${!1}")
	: ${val:=$3}
	eval $1=\"${val}\"
}
show_var() {
	source_var "$@"
	echo "${!1}"
}

try_real_hard_to_find_CHOST() {
	#
	# First we read make.conf
	#

	local varname=${1:-CHOST}
	local conf=${ROOT}/etc/portage/make.conf
	if [[ ! -e ${conf} && -e ${ROOT}/etc/make.conf ]] ; then
		conf=${ROOT}/etc/make.conf
	fi
	local ret=$(source "${conf}" 2>/dev/null ; echo ${!varname})
	if [[ -z ${ret} ]] ; then
		# newer portage supports spaces between the var and =
		# CHOST     =  "this-is-retarded"
		ret=$(eval $(
			${SED} -n \
				-e 's:[[:space:]]::g' \
				-e "/^${varname}=/p" \
				"${conf}"
			) ; echo ${!varname}
		)
	fi

	if [[ -n ${ret} ]] ; then
		echo ${ret}
		return 0
	fi

	#
	# Then we try /etc/env.d/gcc/config-${CTARGET}
	#
	if [[ -s ${ROOT}/etc/env.d/gcc/config-${CTARGET} ]] ; then
		ret=$(split_gcc_ver $(show_var CURRENT "${ROOT}"/etc/env.d/gcc/config-${CTARGET}))
		echo ${ret% *}
	fi
}

get_chost() {
	# If it's set in the env, trust the setting.  If it's wrong,
	# then that's the caller's problem.
	[[ -n ${CHOST} ]] && return 0

	export CHOST

	# make sure portage isnt broken
	if python -V &>/dev/null ; then
		CHOST=$(portageq envvar CHOST 2>/dev/null)
	else
		ewarn "Python seems to be broken, attempting to locate CHOST ourselves ..."
		CHOST=$(try_real_hard_to_find_CHOST)
	fi

	if [[ -z ${CHOST} ]] ; then
		eerror "${argv0}: Could not get portage CHOST!"
		eerror "${argv0}: You should verify that CHOST is set in one of these places:"
		eerror "${argv0}:  - ${ROOT}/etc/portage/make.conf"
		eerror "${argv0}:  - active environment"
		exit 1
	fi
}

is_cross_compiler() {
	[[ ${CC_COMP/${CHOST}} == ${CC_COMP} ]]
}

convert_profile_paths() {
	# Older gcc's used PATH= and ROOTPATH= in the env.d files.
	# Newer one's only use GCC_PATH=.  Convert old to new here.
	cp -p "${GCC_ENV_D}/${CC_COMP}" "${GCC_ENV_D}/${CC_COMP}.gcc-config-ref" || return 1
	GCC_PATH=$(
		unset GCC_PATH PATH ROOTPATH
		source "${GCC_ENV_D}/${CC_COMP}"
		echo ${GCC_PATH:-${PATH:-${ROOTPATH}}}
	)
	${SED} -i \
		-e '/^PATH=/d' \
		-e '/^ROOTPATH=/d' \
		-e '/^GCC_PATH=/d' \
		"${GCC_ENV_D}/${CC_COMP}" || return 1
	echo "GCC_PATH=\"${GCC_PATH}\"" >> "${GCC_ENV_D}/${CC_COMP}" || return 1
	touch -r "${GCC_ENV_D}/${CC_COMP}.gcc-config-ref" "${GCC_ENV_D}/${CC_COMP}" || return 1
	rm -f "${GCC_ENV_D}/${CC_COMP}.gcc-config-ref" || return 1
	return 0
}

# Usage: atomic_cp <source file> <destination dir> <destination file name> <reference file (mtimes)>
atomic_cp() {
	local src=$1 dst=$2 dstfile=$3 ref=$4 tmp
	tmp="${dst}/.gcc.config.${dstfile}"
	# We need to do this mv to make the update atomic in case
	# someone is compiling at the same time they're running
	# gcc-config (which is OK if you're just updating gcc-config
	# itself and picking the same profile).
	cp -f "${src}" "${tmp}"
	touch -r "${ref}" "${tmp}"
	mv "${tmp}" "${dst}/${dstfile}"
}

uniq_wrapper_list() {
	local ver=$1; shift
	# We want to normalize away existing target prefix.
	set -- "${@#${CTARGET}-*}"
	# And we want to filter out any version suffixed progs.
	set -- "${@//*-${ver}}"
	# Finally, filter out dupes.
	printf '%s\n' "$@" | sort -u
}

update_wrappers() {
	# Update the wrappers for this profile.  We need to clean out
	# the old wrappers if the functionality no longer exists (like
	# re-emerging gcc with diff USE flags) and install new wrappers
	# for new functionality (like a version bump).
	local x CTARGET=$1

	# Find the bin wrapper
	local wrapper
	for wrapper in ${GENTOO_LIBDIR} lib lib64 lib32 lib ; do
		wrapper="${ROOT}usr/${wrapper}/misc/gcc-config"
		[[ -e ${wrapper} ]] && break
	done

	# Use the old dir to see what we wrapped up previously.
	local old_wrappers=( $(
		[[ -n ${OLD_GCC_PATH} ]] || exit 1
		uniq_wrapper_list "${OLD_CC_COMP_VERSION}" $(
			cd "${ROOT}${OLD_GCC_PATH}" 2>/dev/null || exit 1
			echo *
		)
	) )

	# See what new stuff we need to wrap up.
	local new_wrappers=( $(
		uniq_wrapper_list "${CC_COMP_VERSION}" $(
			cd "${ROOT}${GCC_PATH}" || exit 1
			echo *
		)
	) )
	[[ -z ${new_wrappers} ]] && return 1

	# First delete the wrappers that the old one provided but the
	# new one does not.
	for x in "${old_wrappers[@]}" ; do
		has "${x}" "${new_wrappers[@]}" && continue
		rm -f "${ROOT}usr/bin/${x}" "${ROOT}usr/bin/${CTARGET}-${x}"
	done

	# For all toolchains, we want to create the fully qualified
	# `tuple-foo`.  Only native ones do we want the simple `foo`.
	local all_wrappers=( ${new_wrappers[@]/#/${CTARGET}-} )
	if ! is_cross_compiler ; then
		all_wrappers+=( "${new_wrappers[@]}" )
		# There are a few fun extra progs which we have to handle #412319
		all_wrappers+=( cc:gcc f77:g77 )
	fi

	# Then install wrappers for anything new to this profile.
	local ref
	for x in "${all_wrappers[@]}" ; do
		# We want to figure out the 'reference file' for each
		# wrapper (the binary we're 'wrapping') so that we can
		# sync mtimes together.  This makes things like ccache
		# happy.  See Bug #70548 for more info.
		ref="${ROOT}${GCC_PATH}/${x#*:}"
		if [[ ${x} == *:* ]] ; then
			# Only install a wrapper if the reference binary exists ...
			[[ -x ${ref} ]] || continue
		fi
		x=${x%:*}
		if [[ ! -x ${ref} ]] ; then
			if is_cross_compiler ; then
				ewarn "insanity with ${x} and ${ref}"
			else
				# For native targets, the ref might not be
				# fully qualified, so use the short name.
				ref="${ROOT}${GCC_PATH}/${x#${CTARGET}-}"
			fi
		fi

		# Now do the actual wrapper copy with paths to the reference binary
		if [[ -x ${ref} ]] ; then
			atomic_cp "${wrapper}" "${ROOT}usr/bin" "${x}" "${ref}"
		else
			ewarn "double insanity with ${x} and ${ref}"
			# Make sure we have no stale wrappers
			rm -f "${ROOT}usr/bin/${x}"
		fi
	done
	# legacy cruft, make sure we dont leave it laying around #143205
	rm -f "${ROOT}usr/bin/${CTARGET}-cc" "${ROOT}usr/bin"/{${CTARGET}-,}g{cc,++}{32,64}

	# install the canonical cpp wrapper
	if ! is_cross_compiler ; then
		atomic_cp "${wrapper}" "${ROOT}lib" "cpp" "${ROOT}usr/bin/cpp"
	fi
}

mv_if_diff() {
	if cmp -s "$1" "$2" ; then
		rm -f "$1"
		return 0
	else
		mv -f "$1" "$2"
		return 1
	fi
}

handle_split_usr() {
	# We need to make sure that libgcc_s.so / libunwind.so make it into /lib.
	# On many systems (x86/amd64/etc...), this will probably never matter,
	# but on other systems (arm/mips/etc...), this is quite critical.
	# http://bugs.gentoo.org/60190
	#
	# The funky move magic is required for proper updating of in-use files.
	#
	# We use the same ordering logic as mentioned in the MY_LDPATH setup.
	# We get the libs from the latest version available.
	local LDPATH

	eval $(grep -h '^LDPATH=' "${GCC_ENV_D}"/${CHOST}-* | tail -1)
	LDPATH=${LDPATH%%:*}

	# If /usr isn't a sep mount, then don't bother with linking stuff.
	if ln "${ROOT}/${LDPATH}/libgcc.a" "${ROOT}"/lib/.gcc.config.$$ 2>/dev/null ; then
		rm -f "${ROOT}"/lib/.gcc.config.$$
		if [[ -n $(find "${ROOT}"/lib*/lib{gcc_s,unwind}.so* 2>/dev/null) ]] ; then
			# If we previously had stuff in /, make sure ldconfig gets re-run.
			rm -f "${ROOT}"/lib*/lib{gcc_s,unwind}.so*
			return 1
		fi
		return 0
	fi

	# Gentoo Prefix systems don't "boot", so no need to handle split-/usr
	[[ -n ${EPREFIX} ]] && return 0

	# Only bother with this stuff for the native ABI.  We assume the user
	# doesn't have critical binaries for non-native ABIs which is fair.
	local gcclib
	local libdir="${ROOT}${GENTOO_LIBDIR}"
	mkdir -p "${libdir}"/.gcc.config.new || return 0 # !?!?!
	for gcclib in gcc_s unwind ; do
		# This assumes that we always have the .so symlink,
		# but for now, that should be safe ...
		for gcclib in "${ROOT}${LDPATH}"/lib${gcclib}.so.* ; do
			[[ -e ${gcclib} ]] || continue
			cp -pP "${gcclib}" "${libdir}"/.gcc.config.new/
			# no need to sanity `rm` this as the `mv` should take care
			# of it.  we also need this step to be completely atomic
			# for systems that have even `mv` linked against libgcc_s.so.
			# http://bugs.gentoo.org/150257
			mv -f "${libdir}"/.gcc.config.new/* "${libdir}"/
		done
	done
	rmdir "${libdir}"/.gcc.config.new

	return 0
}

switch_profile() {
	local OLD_CC_COMP OLD_CC_COMP_VERSION OLD_GCC_PATH OLD_GCC_VER
	local GCC_PATH

	# Make sure we have write access to the dirs.  Do not require `root`
	# so that we work with prefix/cross/etc... setups that run as user.
	[[ ! -w ${ROOT} ]] && die "need write access to ${ROOT}"

	if is_cross_compiler ; then
		ebegin "Switching cross-compiler to ${CC_COMP}"
	else
		ebegin "Switching native-compiler to ${CC_COMP}"
	fi

	if egrep -q '^(PATH|ROOTPATH)=' "${GCC_ENV_D}/${CC_COMP}" ; then
		convert_profile_paths "${GCC_ENV_D}/${CC_COMP}" || return 1
	fi

	# Setup things properly again for this profile
	unset GCC_SPECS LDPATH MULTIOSDIRS
	source "${GCC_ENV_D}/${CC_COMP}"
	# Support older configs that did not setup MULTIOSDIRS for us.
	: ${MULTIOSDIRS:=../${GENTOO_LIBDIR}}

	# Ignore active profile errors here since we're switching away
	OLD_CC_COMP=$(get_current_profile 2>/dev/null)
	if [[ -f ${GCC_ENV_D}/${OLD_CC_COMP} ]] ; then
		OLD_GCC_PATH=$(show_var GCC_PATH "${GCC_ENV_D}/${OLD_CC_COMP}")
		OLD_GCC_VER=$(show_var GCC_VER "${GCC_ENV_D}/${OLD_CC_COMP}")
	fi
	OLD_CC_COMP_VERSION=${OLD_GCC_VER:-$(chop_gcc_ver_spec ${OLD_CC_COMP})}

	# GCC_SPECS have long been stable, and people messing with
	# them know better than to install bad paths, so don't bother
	# with sanity checks anymore.

	echo "CURRENT=${CC_COMP}" > "${GCC_ENV_D}/config-${CTARGET}"

	# Give the native gcc a higher precedence so its PATH gets
	# searched first.  After all, we tend to run the native
	# compiler a *lot* more than the cross-compilers.
	local envd envd_num envd_changed=0
	is_cross_compiler && envd_num="05" || envd_num="04"
	envd="${ENV_D}/${envd_num}gcc-${CTARGET}"
	cat <<-EOF > "${envd}.tmp"
		PATH="${GCC_PATH}"
		ROOTPATH="${GCC_PATH}"
	EOF
	if ! is_cross_compiler ; then
		# Only write GCC_SPECS for the native compiler. #420097
		# Otherwise, the env.d of cross-compilers come after the
		# native one and overrides the native setting.  Further,
		# we don't support GCC_SPECS with cross-compilers, so
		# writing out that settings doesn't make much sense.
		printf 'GCC_SPECS="%s"\n' "${GCC_SPECS}" >> "${envd}.tmp"

		# Regardless of the profile selected, keep the runtime lookup
		# paths stable.  Otherwise, all the apps that were built with
		# a new compiler will start trying to use older versions of
		# the libs, and life gets sad.  We work off the assumption
		# that every shared library gcc ships is ABI compatible (as
		# is the point of SONAMEs).  We don't have to worry about
		# static libraries here as gcc itself will take care of
		# linking against its own internal paths first. #297685
		local MY_LDPATH
		MY_LDPATH=$(${SED} -n \
			-e '/^LDPATH=/{s|LDPATH=||;s|"||g;s|:|\n|g;p}' \
			"${GCC_ENV_D}"/${CHOST}-* | tac
		)

		# Pass all by default
		awk '!/^(STDCXX_INCDIR|LDPATH|CC|CXX|CTARGET|GCCBITS|GCC_SPECS|GCC_PATH|MULTIOSDIRS)=/ {print $0}' \
			"${GCC_ENV_D}/${CC_COMP}" >> "${envd}.tmp"
		if [[ -d ${ROOT}/etc/ld.so.conf.d ]] ; then
			echo "${MY_LDPATH}" > "${ROOT}"/etc/ld.so.conf.d/05gcc-${CTARGET}.conf
		else
			echo "LDPATH=\"${MY_LDPATH}\"" >> "${envd}.tmp"
		fi

		# Punt old files; maybe globs too much, but oh well
		rm -f \
			"${GCC_ENV_D}/NATIVE" "${GCC_ENV_D}/.NATIVE" \
			"${ENV_D}/05gcc" "${ENV_D}/05gcc-${CTARGET}" \
			"${ENV_D}/05gcc-${CTARGET}"-* "${GCC_ENV_D}/config-${CTARGET}"-*

		# Help out the gcc wrapper
		ln -sf ${CC_COMP} "${GCC_ENV_D}/.NATIVE"

		# Relocate random crap
		local x libdir pkgconfdir
		local mver=${CC_COMP_VERSION:0:3}
		for libdir in ${MULTIOSDIRS//:/ } ; do
			pkgconfdir="${ROOT}/usr/lib/${libdir}/pkgconfig"
			for x in "" "-${mver}" ; do
				x="${pkgconfdir}/libgcj${x}.pc"
				if [[ -e ${pkgconfdir}/libgcj-${CC_COMP_VERSION}.pc ]] ; then
					ln -sf libgcj-${CC_COMP_VERSION}.pc "${x}"
				else
					# Maybe we selected a version that lacks gcj support.
					rm -f "${x}"
				fi
			done
			# Clean out anything left over from older versions. #430932
			find "${pkgconfdir}"/libgcj*.pc -xtype l -delete 2>/dev/null
		done

		handle_split_usr
		: $(( envd_changed += $? ))
	fi
	mv_if_diff "${envd}.tmp" "${envd}"
	: $(( envd_changed += $? ))

	update_wrappers ${CTARGET}

	if [[ ${ROOT} == "/" ]] && \
	   [[ ${FORCE} == "yes" || ${envd_changed} -gt 0 ]]
	then
		# in case python is broken ...
		if ! env-update ; then
			echo ""
			ewarn "env-update failed to work properly; making sure ld.so.conf paths"
			ewarn "are setup properly.  Please rerun gcc-config with the -f option."
			echo ""
			if [[ ! -d /etc/ld.so.conf.d ]] ; then
				show_var LDPATH "${ROOT}"/etc/env.d/05gcc-${CTARGET} \
					| ${SED} -e 's|:|\n|g' >> /etc/ld.so.conf
			fi
			ldconfig
		fi
	else
		envd_changed=0
	fi

	eend 0

	if [[ ${envd_changed} -ne 0 ]] ; then
		echo
		ewarn "If you intend to use the gcc from the new profile in an already"
		ewarn "running shell, please remember to do:"
		echo
		ewarn "  . /etc/profile"
		echo
	fi

	return 0
}

get_current_profile() {
	local conf="${GCC_ENV_D}/config-${CTARGET}"
	if [[ ! -f ${conf} ]] ; then
		eerror "${argv0}: No gcc profile is active!"
		return 1
	fi

	source_var CURRENT "${conf}"

	if [[ -z ${CURRENT} ]] ; then
		eerror "${argv0}: No gcc profile is active!"
		return 1
	elif [[ ! -f ${GCC_ENV_D}/${CURRENT} ]] ; then
		eerror "${argv0}: Active gcc profile is invalid!"
		return 1
	fi

	echo "${CURRENT}"

	return 0
}

list_profiles() {
	local i=0
	local filter=

	if [[ ${ROOT} != "/" ]] ; then
		echo "Using gcc-config info in ${ROOT}"
	fi

	if [[ ! -f ${GCC_ENV_D}/config-${CTARGET} ]] ; then
		# get_current_profile already warns
		#eerror "${argv0}: No gcc profile is active; please select one!"
		filter=${CTARGET}
	fi

	source_var CURRENT "${GCC_ENV_D}"/config-${CTARGET}
	CURRENT_NATIVE=${CURRENT}
	local target=
	for x in "${GCC_ENV_D}"/* ; do
		[[ -f ${x} ]] || continue
		[[ ${x} == */config* ]] && continue

		source_var CTARGET "${x}"
		# Older native profiles would not set CTARGET.
		if [[ -z ${CTARGET} ]] ; then
			if [[ ${x} == */${CHOST}-* ]] ; then
				CTARGET=${CHOST}
			else
				ewarn "broken config file: ${x}"
			fi
		fi

		((++i))

		[[ -n ${filter} ]] && [[ ${filter} != ${CTARGET} ]] && continue

		if [[ ${target} != ${CTARGET} ]] ; then
			[[ ${i} -gt 1 ]] && echo
			target=${CTARGET}
			CTARGET=""
		fi

		x=${x##*/}
		if [[ ${x} == ${CURRENT_NATIVE} ]] ; then
			x="${x} ${GOOD}*${NORMAL}"
		elif [[ -e ${GCC_ENV_D}/config-${target} ]] ; then
			source "${GCC_ENV_D}/config-${target}"
			[[ ${x} == ${CURRENT} ]] && x="${x} ${HILITE}*${NORMAL}"
		fi
		echo " [${i}] ${x}"
	done
}

print_environ() {
	local ENV_CMD SET_ELEMENT
	case ${SHELL} in
		*/csh|*/tcsh)
			ENV_CMD="setenv"
			SET_ELEMENT=" "
			;;
		*)
			ENV_CMD="export"
			SET_ELEMENT="="
			;;
	esac

	local var
	for var in GCC_SPECS GCC_PATH ; do
		local ${var}
		source_var ${var} "${GCC_ENV_D}/${CC_COMP}"
	done

	(
	[[ -n ${GCC_PATH} ]] && PATH=${GCC_PATH}:${PATH}
	for var in PATH GCC_SPECS ; do
		echo "${ENV_CMD} ${var}${SET_ELEMENT}\"${!var}\""
	done
	)
}

get_bin_path() { show_var GCC_PATH "${GCC_ENV_D}/${CC_COMP}" ; }
get_lib_path() { show_var LDPATH "${GCC_ENV_D}/${CC_COMP}" ; }

split_gcc_ver() {
	# Split up the gcc profile into components:
	# TARGET-VER[-specs] -> TARGET VER [specs]
	# arm-linux-3.3.6 -> arm-linux 3.3.6
	# x86_64-linux-4.0.1-pre1234 -> x86_64-linux 4.0.1-pre1234
	# sh-linux-3.4.4-hardened -> sh-linux 3.4.4 hardened
	#
	# So below we will start at the end and run a small state machine ...
	# specs [3]
	#    accept everything
	# specs -> version transition [3->2]
	#    when we find a version component
	# version [2]
	#    accept only version components (see the regex)
	# version -> target transition [2->1]
	#    when we hit a non version component
	# target [1]
	#    accept everything we have left
	#
	echo "$@" | awk -F- '
	function pushit(onme, pushee) {
		return (onme == "" ? pushee : pushee"-"onme);
	}
	{
		state=3
		targ=""
		ver=""
		spec=""
		for (i=NF; i > 0; --i) {
			if (state >= 2) {
				if ($i ~ /^(alpha|beta|pre|rc|p)?[[:digit:].]+$/) {
					ver=pushit(ver, $i)
					state=2
				} else if (state == 3)
					spec=pushit(spec, $i)
				else
					state=1
			}
			if (state == 1)
				targ = pushit(targ, $i)
		}

		if (targ == "") {
			if (ver == "") {
				ver=spec
				spec=""
			}
			targ=ver
			ver=""
		}
		print targ " " ver (spec != "" ? " " spec : "")
	}'
}
chop_gcc_ver_spec() {
	local splitTED=$(split_gcc_ver "$@") # target ver spec
	splitTED=${splitTED#* }              # ver spec
	echo ${splitTED/ /-}                 # ver-spec
}

set_doit() {
	[[ -n ${DOIT} ]] && die "too many actions selected!"
	DOIT=$1
}
DOIT=""
FORCE="no"

CC_COMP=
ENV_D="${ROOT}etc/env.d"
GCC_ENV_D="${ENV_D}/gcc"

for x in "$@" ; do
	case "${x}" in
		# Only use specified compiler if one is not already selected.
		-O|--use-old)
			: ${CTARGET:=$(try_real_hard_to_find_CHOST)}
			if get_current_profile &>/dev/null ; then
				CC_COMP=$(get_current_profile)
			else
				die "No profile selected, unable to utilize --use-old"
			fi
			;;
		-f|--force)
			FORCE="yes"
			;;
		-c|--get-current-profile)
			set_doit get_current_profile
			;;
		-l|--list-profiles)
			set_doit list_profiles
			;;
		-S|--split-profile)
			if [[ ( $1 != "-S" && $1 != "--split-profile" ) || $# -eq 1 ]] ; then
				usage 1
			fi
			shift # push -S out
			for x in "$@" ; do
				split_gcc_ver ${x}
			done
			exit 0
			;;
		-E|--print-environ)
			set_doit print_environ
			;;
		-B|--get-bin-path)
			set_doit get_bin_path
			;;
		-L|--get-lib-path)
			set_doit get_lib_path
			;;
		-x|--debug)
			set -x
			;;
		-C|--nocolor)
			# nothing to do; functions.sh parsed this for us
			;;
		-h|--help)
			usage 0
			;;
		-V|--version)
			echo "${argv0}: @PV@"
			exit 0
			;;
		-*)
			die "Invalid switch!  Run ${argv0} without parameters for help."
			;;
		*)
			if [[ -n ${CC_COMP} ]] ; then
				die "Too many arguments!  Run ${argv0} without parameters for help."
			fi

			if [[ -z $(echo ${x} | tr -d '[:digit:]') ]] ; then
				# User gave us a # representing the profile
				i=1
				for y in "${GCC_ENV_D}"/* ; do
					[[ -f ${y} ]] || continue
					[[ ${y} == */config* ]] && continue

					if [[ -f ${y} ]] && [[ ${x} == ${i} ]] ; then
						CC_COMP=${y##*/}
						break
					fi
					((++i))
				done
				if [[ -z ${CC_COMP} ]] ; then
					die "Could not locate profile #$x !"
				fi
			else
				# User gave us a full HOST-gccver
				x=${x##*/}
				if [[ ${DOIT} == "get_current_profile" && -z $(ls "${GCC_ENV_D}"/${x}-* 2>/dev/null) ]] || \
				   [[ ${DOIT} != "get_current_profile" && ! -f ${GCC_ENV_D}/${x} ]]
				then
					# Maybe they just gave us a gccver ...
					get_chost
					if [[ -f ${GCC_ENV_D}/${CHOST}-${x} ]] ; then
						x=${CHOST}-${x}
					else
						die "Could not locate '$x' in '${GCC_ENV_D}/' !"
					fi
				fi
				CC_COMP=${x}
			fi
			;;
	esac
done

[[ -z ${DOIT}${CC_COMP} ]] && usage 1
: ${DOIT:="switch_profile"}

get_chost
[[ ${DOIT} == "get_current_profile" ]] \
	&& : ${CTARGET:=${CC_COMP:-${CHOST}}} \
	|| : ${CTARGET:=${CHOST}}

# Do migration of old files
if [[ -e ${GCC_ENV_D}/config ]] ; then
	(
	unset CURRENT
	. "${GCC_ENV_D}"/config
	if [[ ${CURRENT} == ${CTARGET}-* ]] ; then
		mv "${GCC_ENV_D}"/config "${GCC_ENV_D}"/config-${CTARGET} || exit 1
	else
		# who knows; force a refresh by punting it
		rm -f "${GCC_ENV_D}"/config || exit 1
	fi
	) || die "could not get rid of old ${GCC_ENV_D}/config"
fi

if [[ -z ${CC_COMP} ]] ; then
	CC_COMP=$(get_current_profile)
	if [[ $? -ne 0 ]] ; then
		echo "${CC_COMP}"
		list_profiles
		exit 1
	fi
fi

if [[ ${DOIT} != "get_current_profile" ]] ; then
	GCC_LIB=$(get_lib_path | awk -F/ '{ print  "/"$2"/"$3"/"$4"/" }')

	# For people who insist on using funky version strings ("4.6.x"
	# rather than "4.6.2"), allow them to manually specify it.
	source_var GCC_VER "${GCC_ENV_D}/${CC_COMP}"

	CC_COMP_VERSION=${GCC_VER:-$(chop_gcc_ver_spec ${CC_COMP})}
	CC_COMP_TARGET=$(show_var CTARGET "${GCC_ENV_D}/${CC_COMP}")
	if [[ -z ${CC_COMP_TARGET} ]] ; then
		# Native configs don't have CTARGET in there.
		CC_COMP_TARGET=${CC_COMP%-${CC_COMP_VERSION}*}
	fi

	if [[ ! -d ${ROOT}/${GCC_LIB}/${CC_COMP_TARGET}/${CC_COMP_VERSION} ]]; then
		CC_COMP_VERSION=${CC_COMP_VERSION%-*}
	fi

	if [[ ! -d ${ROOT}/${GCC_LIB}/${CC_COMP_TARGET}/${CC_COMP_VERSION} ]] || \
	   [[ ! -f ${GCC_ENV_D}/${CC_COMP} ]]
	then
		eerror "${argv0}: Profile does not exist or invalid setting for ${GCC_ENV_D}/${CC_COMP}" 1>&2
		#exit 1
	fi
fi

${DOIT}

# vim:ts=4