On Sunday 21 August 2011 04:04:05 Matthew Finkel wrote: > On Sat, Aug 20, 2011 at 10:46 PM, Dale <rdalek1...@gmail.com> wrote: > > How hard is it to set up a 64 bit machine to compile programs for a 32 > > bit system? > > > > Dale > > > > :-) :-) > > It's actually quite easy. IIRC, when I did it last, the only difference > is that when you chroot into the subsystem you need prefix the command > with linux32, e.g. linux32 chroot /path/to/chroot /bin/bash
Yes, just follow this guide: http://www.gentoo.org/proj/en/base/amd64/howtos/chroot.xml I did that and it was straightforward as far as I remember. I did spend some time thinking at a few stages, to get an understanding of what I was doing rather than just blindly following somebody else's prescription. Then it's a matter of writing some simple scripts to mount the packages directory on the big host. Here's mine, most of which I scrounged from somewhere: $ cat /etc/init.d/atom #!/sbin/runscript depend() { need localmount need bootmisc } start() { ebegin "Mounting 32-bit chroot dirs" mount -o bind /dev /mnt/atom/dev >/dev/null mount -o bind /dev/pts /mnt/atom/dev/pts >/dev/null mount -o bind /dev/shm /mnt/atom/dev/shm >/dev/null mount -t proc /proc /mnt/atom/proc >/dev/null mount -o bind /sys /mnt/atom/sys >/dev/null mount -o bind /tmp /mnt/atom/tmp >/dev/null mount -t nfs -o vers=3 192.168.2.2:/usr/portage/packages /mnt/atom/usr/portage/packages eend $? "An error occurred while attempting to mount 32-bit chroot directories" ebegin "Copying 32-bit chroot files" cp -pf /etc/resolv.conf /mnt/atom/etc/ >/dev/null cp -pf /etc/passwd /mnt/atom/etc/ >/dev/null cp -pf /etc/shadow /mnt/atom/etc/ >/dev/null cp -pf /etc/group /mnt/atom/etc/ >/dev/null cp -pf /etc/hosts /mnt/atom/etc/ > /dev/null cp -Ppf /etc/localtime /mnt/atom/etc/ >/dev/null eend $? "An error occurred while attempting to copy 32-bit chroot files." } stop() { ebegin "Unmounting 32-bit chroot dirs" umount -f /mnt/atom/dev/pts >/dev/null umount -f /mnt/atom/dev/shm >/dev/null umount -f /mnt/atom/dev >/dev/null umount -f /mnt/atom/proc >/dev/null umount -f /mnt/atom/sys >/dev/null umount -f /mnt/atom/tmp >/dev/null umount -f /mnt/atom/usr/portage/packages >/dev/null eend $? "An error occurred while attempting to unmount 32-bit chroot directories" } I could list the steps of my daily routine to upgrade both the client and the chroot if that would help. -- Rgds Peter Linux Counter 5290, 1994-04-23
