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List Archive: gentoo-embedded
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To: gentoo-embedded@g.o
From: Stanisław Raczyński <sraczynski@...>
Subject: Re: Building a cross-compile environment for ARM
Date: Thu, 30 Mar 2006 15:49:06 +0200
Derick Swanepoel wrote:

>Hi,
>
>I'm busy building a cross-compile environment for an ARM (XScale) in an x86
>host environment, but I'm having trouble emerging packages like procps and
>gdb which require headers from /usr/include.
>  
>
What do you need procps for? If you're using busybox, it already 
contains ps, free, top and kill and it should be enough for most 
embedded systems.

>I've built an armeb-softfloat-linux-uclibc cross toolchain with crossdev
>which can successfully compile uclibc, bash, baselayout, etc. and install
>in ROOT=/gentoo-arm. However, when I try to emerge something like procps,
>it fails to find curses.h and termcap.h. Where should the cross-compiler be
>looking for these headers?
>  
>
Is ROOT the only variable you set? There are some other important vars, 
like ARCH, CBUILD, CHOST, CTARGET. Many others are also useful while 
cross-emerging.

>Another problem I have is that gawk (3.1.4-r4) fails to execute with:
>awk: can't resolve symbol '__fixdfsi'
>As far as I can determine, __fixdfsi is one of GCC's softfloat library routines.
>
>I would really like to know how the armeb-uclibc-softfloat stages (found in
>experimental/arm/embedded on various Gentoo mirrors) were built.
>  
>
As far as I know, they use catalyst.

>Thanks,
>Derick
>
>  
>
I am building small Embedded Gentoo systems for i686 and ARM920T 
architectures and for that I wrote a little script called egg 
(attached). Perhaps you will find it useful. To create such a system for 
arm920t (baselayout+uclibc+busybox), I'd simply run:

# crossdev -t arm-unknown-linux-uclibc
# egg -l uclibc -a arm920t -o /home/gentoo-for-arm

Later, to add some packages (e.g. dropbear and ncurses) I'd write:

# egg -l uclibc -a arm920t -o /home/gentoo-for-arm -fn dropbear ncurses

And finally, when I'm satisfied with my rootfs, I can strip it off 
unnecessary trash:

# egg -l uclibc -arm920t -o /home/gentoo-for-arm -fns

This is an extremely simple tool (e.g. you can't set USE flags for 
individual packages), but still I find it quite sufficient for my work. 
You can use it to generate a rootfs for an armeb architecture just by 
adding it to parse_arch() function. If you do that, don't forget to send 
me the updated version.

Hope you find it useful,
Stanislaw Raczynski
#!/bin/bash
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# 
# This script creates a tiny rootfs intended for embedded
# systems. It consists of baselayout, a C library, system tools
# and optional user packages.
#
# Created by Stanislaw Raczynski (sutashu at gmail dot com)
#
# Written by Stanislaw Raczynski (sutashu at gmail dot com),
#            Marek Malczak

#-----------------------------------------------------------------------------
source /sbin/functions.sh || exit 3
if [[ `whoami` != "root" ]] ; then
        eerror "You must run this as root"
        exit 2
fi
#-----------------------------------------------------------------------------
die() {
        echo
        eerror $*
        eerror Please read the logfiles:
        eerror ${PORT_LOGDIR}/mkrootfs.log
        eerror ${logfile}
        exit 1
}
#-----------------------------------------------------------------------------
# Far out of date
usage() {
cat << EOF
Usage: ${HILITE}egg${NORMAL} ${GOOD}[options]${NORMAL}
${GOOD}[extra packages]${NORMAL}
Options:
${GOOD}-l${NORMAL} libc
Specify variant of libc to use. See egg -l help for details.
${GOOD}-b${NORMAL} baselayout
Specify variant of baselayout to use. See egg -b help for details.
${GOOD}-u${NORMAL} utils
Specify variant of system tools to use. See egg -u help for details.
${GOOD}-a${NORMAL} arch
Specify target architecture.
${GOOD}-s${NORMAL}
Strip rootfs at the end.
${GOOD}-v${NORMAL}
Be verbose.
EOF
exit ${1:-0}
}
#-----------------------------------------------------------------------------
parse_arch() {
CROSS_COMPILING="yes"
case $1 in
	help) cat << EOF

Supported architectures for cross-compiling:
${GOOD}arm{$NORMAL} Generic ARM
${GOOD}arm920t{$NORMAL} ARM 920t
${GOOD}x86{$NORMAL} Generic x86
EOF
	   exit 0;;
	arm) TARCH="arm";
	     EKEYWORDS="-* arm";
	     ECHOST="arm-unknown-linux-";
	     EUCLIBC_CPU="GENERIC_ARM";;
	arm920t) TARCH="arm";
	         EKEYWORDS="-* arm";
	         ECHOST="arm-unknown-linux-";
	         EUCLIBC_CPU="ARM920T";;
	x86) TARCH="x86";
	     EKEYWORDS="-* x86";
	     ECHOST="i386-unknown-linux-";
	     EUCLIBC_CPU="GENERIC_386";;
esac
}
#-----------------------------------------------------------------------------
parse_baselayout() {
case $1 in
	help) cat << EOF

Supported baselayouts:
${GOOD}baselayout${NORMAL} Standard Gentoo baselayout.
${GOOD}baselayout-lite${NORMAL} Embedded Gentoo baselayout.
EOF
	   exit 0;;
	baselayout) BPKG="sys-apps/baselayout";;
	baselayout-lite) BPKG="sys-apps/baselayout-lite";;
	*) eerror "Unsopported baselayout - '$1'!";
	   parse_baselayout "help"; exit 1;;
esac
}
#-----------------------------------------------------------------------------
parse_libc () {
case $1 in
	help) cat << EOF

Supported C libraries:
${GOOD}gnu${NORMAL} GNU C Library (glibc). Pretty fat.
${GOOD}uclibc${NORMAL} uClibc. Intended for embedded systems.
${GOOD}diet${NORMAL} dietlibc. Minimal C library.
EOF
exit 0;;
	gnu) LPKG="sys-libs/glibc"; EELIBC="glibc";;
	uclibc) LPKG="sys-libs/uclibc"; EELIBC="uclibc";;
	diet) LPKG="dev-libs/dietlibc";;
	*) eerror "Unsopported C library - '$1'!";
	   parse_libc "help";
	   exit 1;;
esac
}
#-----------------------------------------------------------------------------
parse_utils () {
case $1 in
	help) cat << EOF

Supported init systems:
${GOOD}busybox${NORMAL} Busybox. Complete, but small toolset.
${GOOD}minutils${NORMAL} Set of minimalistic system utilities.
${GOOD}core${NORMAL} Standard GNU file utilities.
EOF
	    exit 0;;
	busybox) UPKG="busybox";;
	minutils) UPKG="minutils";;
	core) UPKG="sys-apps/coreutils";;
	# embutils) NOT IN PORTAGE!
	*) eerror "Unsopported system toolset - '$1'!"; parse_utils "help"; exit 1;;
esac
}
#-----------------------------------------------------------------------------
doemerge() {
	[[ $# < 3 ]] && return 1
	name_without_slashes=`echo "$1" | tr "/" "_"`
	local logfile="${PORT_LOGDIR}/rootfsmaker-$2-${name_without_slashes}.log"
	export USE="$3 elibc_${EELIBC}"
	einfo "Log: ${logfile}"
	ebegin "Emerging $1"
	if [[ ${UOPTS/-v} != ${UOPTS} ]] ; then
		emerge info
		emerge $1 ${EOPTS} 2>&1 | tee ${logfile}
	else
		emerge $1 ${EOPTS} >& ${logfile}
	fi
	local _pipestatus=${PIPESTATUS[*]}
	[[ "${_pipestatus// /}" -eq 0 ]] || die "$1 failed :("
	eend 0
}
#-----------------------------------------------------------------------------
dounmerge() {
	name_without_slashes=`echo "$1" | tr "/" "_"`
	local logfile="${PORT_LOGDIR}/rootfsmaker-unmerge-${name_without_slashes}.log"
	export USE="elibc_${EELIBC}"
	einfo "Log: ${logfile}"
	ebegin "Unmerging $1"
	if [[ ${UOPTS/-v} != ${UOPTS} ]] ; then
		emerge info
		emerge -C $1 ${UOPTS} 2>&1 | tee ${logfile}
	else
		emerge -C $1 ${UOPTS} >& ${logfile}
	fi
	local _pipestatus=${PIPESTATUS[*]}
	[[ "${_pipestatus// /}" -eq 0 ]] || die "$1 failed :("
	eend 0
}
#-----------------------------------------------------------------------------
PORTDIR=$(portageq envvar PORTDIR)
PORT_LOGDIR=$(portageq envvar PORT_LOGDIR)
PORT_LOGDIR=${PORT_LOGDIR:-/var/log/portage}
export PORTAGE_TMPDIR="$(portageq envvar PORTAGE_TMPDIR)"
[[ ! -d ${PORT_LOGDIR} ]] && mkdir -p ${PORT_LOGDIR}
[[ ! -d ${PORTAGE_TMPDIR} ]] && mkdir -p ${PORTAGE_TMPDIR}

CBUILD=$(portageq envvar CBUILD)
CHOST=$(portageq envvar CHOST)

# Initial variable values
HARCH=$(env -uARCH portageq envvar ARCH)
TARCH=${HARCH}
EKEYWORDS="-* ${TARCH}"

#God will strike me down for this :/ (plz any1 knowing how to do it better, change it)
#this basically cuts the last part of arch name i.e. arch-arm-cutthis
arch_word_count=`echo ${CHOST} | tr "-" " " | wc -w`
arch_word_count=`expr ${arch_word_count} - 1`
ECHOST="`echo ${CHOST} | cut -d "-" -f -${arch_word_count}`-"

# Packages to emerge
LPKG="sys-libs/uclibc"
BPKG="sys-apps/baselayout-lite"
IPKG=""
UPKG="busybox"
XPKG=""

# Packages to unmerge
CPKG=""

# emerge parameters
UOPTS=
EOPTS=

# Options
STRIP="no"
FORCE_CREATE="no"
CROSS_COMPILING="yes"
EMERGE_SYSTEM_PACKAGES="yes"

# Other vars
EELIBC="uclibc"
EROOT="${PORTAGE_TMPDIR}/rootfsmaker"
UCLIBC_CPU=${HARCH}
export CBUILD=$(portageq envvar CBUILD)

#Logging activity
echo "`date` $0 $*" >> "${PORT_LOGDIR}/rootfsmaker.log"

# Parse arguments:
while getopts "l:b:u:a:sVhfvo:c:n" flag
do
	case $flag in
		l) parse_libc ${OPTARG};;
		b) parse_baselayout ${OPTARG};;
		u) parse_utils ${OPTARG};;
		a) parse_arch ${OPTARG};;
		s) STRIP="yes";;
		V) echo rootfsmaker version 0.2; exit 0;;
		h) usage; exit;;
		f) FORCE_CREATE="yes";;
		v) UOPTS="${UOPTS} -v";;
		o) EROOT=`echo ${OPTARG} | grep -q "^/" && echo ${OPTARG} || echo "${PWD}/${OPTARG}"`;;
		c) CPKG="${CPKG}${OPTARG} ";;
		n) EMERGE_SYSTEM_PACKAGES="no";;
		?) usage; exit;;
  	esac
done

# --nodeps is quite necessary, since all packages have unwanted system-related dependencies
EOPTS="${UOPTS} -u --nodeps"

# Extra packages to emerge:
shift `expr ${OPTIND} - 1`
XPKG=$*

#-----------------------------------------------------------------------------
if [[ -d ${EROOT} && ${FORCE_CREATE} != "yes" ]]; then
        eerror "Directory ${EROOT} already exists (try -f option). Exitting."
        exit 1
fi
mkdir -p ${EROOT}

# Export variables for emerge
export ARCH=${TARCH}
export ACCEPT_KEYWORDS=${EKEYWORDS}
if [[ ${CROSS_COMPILING} = "yes" ]]; then
	case ${EELIBC} in
		"uclibc") export CHOST="${ECHOST}uclibc";;
		"glibc") export CHOST="${ECHOST}gnu";;
		*) die "Unknown C library - '${EELIBC}'.";;
	esac
	export CROSS=${CHOST}-
	export CTARGET=${CHOST}
else
	# TODO
	export CBUILD=${CHOST}
	export CTARGET=${CHOST}
	export CHOST=${CHOST}
fi
export CFLAGS="-Os -pipe"
export CXXFLAGS=${CFLAGS}
export ROOT=${EROOT}
export FEATURES="-* -distcc ccache nodoc noinfo noman strict"
export CONFIG_PROTECT="-* ${ROOT}/etc"

# This should strip executables of unneeded content
export PORTAGE_STRIP_FLAGS="--strip-unneeded -R .comment"

# This should choose the C library we use
export ELIBC=${EELIBC}
export PORTAGE_LIBC=${ELIBC}
#export PROFILE_ARCH="arm920t"

# These are for uClibc:
export UCLIBC_CPU=${EUCLIBC_CPU}

# Print info
(
	einfo "Host Portage ARCH: ${HARCH}"
	einfo "Target Portage ARCH: ${TARCH}"
	echo
	einfo "rootfs location: ${EROOT}"
	einfo "Strip rootfs: ${STRIP}"
	echo
	if [[ ${EMERGE_SYSTEM_PACKAGES} = "yes" ]]; then
		einfo "C library: ${LPKG}"
		einfo "Baselayout: ${BPKG}"
		einfo "System toolset: ${UPKG}"
	else
		einfo "Skipping system packages"
	fi
	echo
	if [[ -n ${XPKG} ]] ; then
		einfo "Extra packages to install: ${XPKG}"
		echo
	fi
) >& ${PORT_LOGDIR}/rootfsmaker.log || exit 1
cat ${PORT_LOGDIR}/rootfsmaker.log
emerge info >> ${PORT_LOGDIR}/rootfsmaker.log

#Emerge system packages
if [[ ${EMERGE_SYSTEM_PACKAGES} = "yes" ]]; then
	# Emerge baselayout
	if [[ ${BPKG} == "sys-apps/baselayout-lite" ]] ; then
	mkdir -p /etc/portage
	grep -qs "baselayout-lite" /etc/portage/package.keywords \
		|| echo "sys-apps/baselayout-lite -*" \
		>> /etc/portage/package.keywords
	fi
	doemerge ${BPKG} "baselayout" "-* bootstrap" \
		|| die "Could not emerge ${BKPG}"
	
	# Emerge C library
	if [[ ${LPKG} = "sys-libs/glibc" ]] ; then
		doemerge ${LPKG} libc "userlocales -*" || die "Could emerge ${LPKG}"
	else
		doemerge ${LPKG} libc "-*" || die "Could emerge ${LPKG}"
	fi
	
	# Emerge busybox
	doemerge ${UPKG} "utils" "-* static make-symlinks" \
		|| die "Could not emerge busybox."
	#doemerge "tinylogin" "utils" "-* static make-symlinks" \
	#	|| die "Could not emerge tinylogin."
fi

#Unmerge packages
if [[ -n ${CPKG} ]] ; then
	for SINGLE_PACKAGE_UNMERGE in ${CPKG};do
		dounmerge ${SINGLE_PACKAGE_UNMERGE} \
			|| die "Could not unmerge package '${SINGLE_PACKAGE_UNMERGE}'."
	done
fi

# Emerge extra packages
if [[ -n ${XPKG} ]] ; then
	for SINGLE_PACKAGE_MERGE in ${XPKG};do
		if [[ ${SINGLE_PACKAGE_MERGE} = "dropbear" ]] ; then
			doemerge ${SINGLE_PACKAGE_MERGE} "extra" "-* minimal multicall static" \
				|| die "Could not emerge extra package '${SINGLE_PACKAGE_MERGE}'."
		else
			doemerge ${SINGLE_PACKAGE_MERGE} "extra" "-* minimal multicall" \
				|| die "Could not emerge extra package '${SINGLE_PACKAGE_MERGE}'."
		fi
	done
fi

# Statistics
echo
einfo "rootfs size: `du -sh ${EROOT}`"

# Stripping the rootfs
if [[ ${STRIP} == "yes" ]] ; then
ebegin "Stripping rootfs"
(
	rm -R ${EROOT}/usr/include
	rm -R ${EROOT}/usr/share/doc
	rm -R ${EROOT}/usr/share/man
	rm -R ${EROOT}/tmp/*
	rm -R ${EROOT}/var/tmp/*
	rm -R ${EROOT}/var/db
	rm -R ${EROOT}/var/cache
	rm -R ${EROOT}/var/lib/portage
) >& ${PORTAGE_LOGDIR}/rootfsmaker.log \
|| die "Stripping error."
eend 0
einfo "rootfs size: `du -sh ${EROOT}`"
fi

# Finished
echo
einfo "Done. Enjoy your rootfs."
echo
Replies:
Re: Building a cross-compile environment for ARM
-- Derick Swanepoel
References:
Building a cross-compile environment for ARM
-- Derick Swanepoel
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Updated Jun 17, 2009

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