path: root/gcc-config

#!/bin/bash
# Copyright 1999-2003 Gentoo Foundation
# Distributed under the terms of the GNU General Public License
# Author:  Martin Schlemmer <azarah@gentoo.org>
# $Header: gentoo-x86/sys-devel/gcc-config/files/gcc-config-1.3.4,v 1.1 2003/11/18 19:39:07 azarah Exp $


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

usage() {
cat << "USAGE_END"
Usage: gcc-config [Option] [CC Profile]
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.

  -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.

The profile name is in the form of:

  <CHOST>-<gcc version>

For example:

  i686-pc-linux-gnu-3.2.1



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

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
}

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)"
}

CC_COMP=""

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

	# Use absolute path until all protage versions have portageq in /usr/bin
	export REAL_CHOST="$(/usr/lib/portage/bin/portageq envvar CHOST)"

	if [ -z "${REAL_CHOST}" ]
	then
		eerror "$0:  Could not get portage CHOST!"
		return 1
	fi
}

switch_profile() {
	local MY_LDPATH=""
	local GCC_PROFILES=""
	local OLD_CC_COMP=""

	if [ -r /etc/env.d/gcc/config ]
	then
		source /etc/env.d/gcc/config

		if [ -n "${CURRENT}" ]
		then
			OLD_CC_COMP="${CURRENT}"
		fi
	fi

	if [ "$(id -u)" -ne 0 ]
	then
		eerror "$0: Must be root."
		exit 1
	fi

	ebegin "Switching to ${CC_COMP} compiler"

	# Sourcing /etc/env.d/gcc/${CC_COMP} is going to mess up
	# PATH among things...
	cmd_setup

	# Order our profiles to have the default 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 ...
	get_real_chost
	GCC_PROFILES="$(${FIND} /etc/env.d/gcc/ -name "${REAL_CHOST}-*")"
	GCC_PROFILES="${GCC_PROFILES/\/etc\/env.d\/gcc\/${CC_COMP}}"
	GCC_PROFILES="/etc/env.d/gcc/${CC_COMP} ${GCC_PROFILES}"

	# Extract all LDPATH's for our CHOST
	for x in ${GCC_PROFILES}
	do
		if [ -f "${x}" ]
		then
			source "${x}"

			if [ -z "${MY_LDPATH}" ]
			then
				if [ -d "${LDPATH}" ]
				then
					MY_LDPATH="${LDPATH}"
				fi
			else
				if [ -d "${LDPATH}" ]
				then
					MY_LDPATH="${MY_LDPATH}:${LDPATH}"
				fi
			fi
		fi
	done

	# Setup things properly again for this profile
	source "/etc/env.d/gcc/${CC_COMP}"

	# Setup /etc/env.d/05gcc
	${AWK} '!/^STDCXX_INCDIR=|^LDPATH=/ {print $0}' \
		"/etc/env.d/gcc/${CC_COMP}" > /etc/env.d/05gcc

	# Add our custom LDPATH
	echo "LDPATH=\"${MY_LDPATH}\"" >> /etc/env.d/05gcc

	# Make sure we do not recreate /lib/cpp and /usr/bin/cc ...
#	echo "DISABLE_GEN_GCC_WRAPPERS=\"yes\"" >> /etc/env.d/05gcc

	echo "CURRENT=${CC_COMP}" > /etc/env.d/gcc/config

	source /etc/profile

	# These might not be installed, and we want to update the mtime
	# for ccache and distcc anyhow ...
	${RM} -f /lib/cpp
	${CP} -f /usr/lib/gcc-config/wrapper /lib/cpp
	for x in gcc cpp cc c++ g++ "${REAL_CHOST}-gcc" "${REAL_CHOST}-c++" "${REAL_CHOST}-g++"
	do
		${RM} -f "/usr/bin/${x}"
		${CP} -f /usr/lib/gcc-config/wrapper "/usr/bin/${x}"

		if [ "${OLD_CC_COMP}" != "${CC_COMP}" ]
		then
			${TOUCH} -m "/usr/bin/${x}"
		fi
	done


	${ENV_UPDATE} &> /dev/null

	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:"
		echo
		ewarn "  # source /etc/profile"
		echo
	fi

	return 0
}

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

	source /etc/env.d/gcc/config

	if [ -z "${CURRENT}" ]
	then
		eerror "$0:  No gcc profile is active!"
		return 1
	fi

	echo "${CURRENT}"

	return 0
}

list_profiles() {
	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}" != "/etc/env.d/gcc/config" ]
		then
			echo "[${i}] ${x##*/}"
			i=$((i + 1))
		fi
	done
}

print_environ() {
	local OLDPATH="${PATH}"

	source "/etc/env.d/gcc/${CC_COMP}"

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

#	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=\"${CC}\""
	echo "export CXX=\"${CXX}\""
}

get_bin_path() {
	source "/etc/env.d/gcc/${CC_COMP}"

	echo "${PATH}"

	return 0
}

get_lib_path() {
	source "/etc/env.d/gcc/${CC_COMP}"

	echo "${LDPATH}"

	return 0
}

get_stdcxx_incdir() {
	source "/etc/env.d/gcc/${CC_COMP}"

	echo "${LDPATH}/include/${STDCXX_INCDIR}"

	return 0
}

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

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="$(get_current_profile)"
			fi
			;;
		-P|--use-portage-chost)
			CHECK_CHOST="yes"
			;;
		-c|--get-current-profile)
			if [ "${NEED_ACTION}" = "yes" ]
			then
				NEED_ACTION="no"
				DOIT="get_current_profile"
			fi
			;;
		-l|--list-profiles)
			if [ "${NEED_ACTION}" = "yes" ]
			then
				NEED_ACTION="no"
				DOIT="list_profiles"
			fi
			;;
		-E|--print-environ)
			if [ "${NEED_ACTION}" = "yes" ]
			then
				NEED_ACTION="no"
				DOIT="print_environ"
			fi
			;;
		-B|--get-bin-path)
			if [ "${NEED_ACTION}" = "yes" ]
			then
				NEED_ACTION="no"
				DOIT="get_bin_path"
			fi
			;;
		-L|--get-lib-path)
			if [ "${NEED_ACTION}" = "yes" ]
			then
				NEED_ACTION="no"
				DOIT="get_lib_path"
			fi
			;;
		-X|--get-stdcxx-incdir)
			if [ "${NEED_ACTION}" = "yes" ]
			then
				NEED_ACTION="no"
				DOIT="get_stdcxx_incdir"
			fi
			;;
		-*)
			eerror "$0: Invalid switch!  Run $0 without parameters for help."
			exit 1
			;;
		*)
			if [ -z "${CC_COMP}" ]
			then
				if [ -n "`echo ${x} | gawk '/^[[:digit:]]*$/ { print }'`" ]
				then
					i=1
					for y in /etc/env.d/gcc/*
					do
						[ "${y}" = "/etc/env.d/gcc/config" ] && continue

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

if [ "${DOIT}" = "switch_profile" -a -z "${CC_COMP}" ]
then
	usage
fi

if [ -z "${CC_COMP}" ]
then
	if get_current_profile &> /dev/null
	then
		CC_COMP="$(get_current_profile)"
	else
		eerror "$0: No default profile setup!"
		exit 1
	fi
fi

if [ ! -d "/usr/lib/gcc-lib/${CC_COMP%-*}/${CC_COMP##*-}" -o \
     ! -f "/etc/env.d/gcc/${CC_COMP}" ]
then
	eerror "$0: Profile does not exist!"
	exit 1
fi

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

eval ${DOIT}


# vim:ts=4