Re: Cross compiler

On 4/22/21 3:27 PM, John Paul Adrian Glaubitz wrote:
> On 4/22/21 12:07 PM, Helge Deller wrote:
>> Set up the chroot, e.g.:
>> debootstrap --arch=hppa  --no-check-gpg unstable  /srv/test http://ftp.debian-ports.org/debian/
>
> You will need to use qemu-debootstrap as otherwise the command will fail
> without the "--foreign" flag.

Good point.
It didn't failed for me, but using qemu-debootstrap is probably better.

>> You need to install the debian qemu-user-static package.
>> I suggest to use my pre-built qemu-hppa-static binary from:
>> http://dellerweb.de/qemu/qemu-hppa-static
>> which you should copy to /usr/bin/qemu-hppa-static  and inside the chroot in the /usr/bin directory.
>> Important: Restart the binfmt-support so that the new binary will be used.
>> run: "service binfmt-support restart"
>
> Installing the qemu-user-static package on Debian testing or newer
> is already sufficient. It is not necessary to copy the qemu binary
> into the chroot and also not recommended as the proper binary is
> already correctly invoked through binfmt-support.
>
> Since Debian's qemu-user package also contains a tweak to fix the argv
> thrashing issue in QEMU, I would actually advise against using your
> custom qemu-user binary unless it is really necessary. But I assume
> Debian testing/unstable should have a QEMU version recent enough for
> proper hppa supprt.

As far as I know, some of my latest hppa-related patches aren't yet in debian's unstable/testing qemu package.
Even worse, on Debian AMD64 buster you get qemu 3.1 packages which lack much of the hppa support.
This is why I (for now) suggested to use my binary.
But in general everyone should prefer to the debian  rebuilt qemu packages.

>> mount the directories, replace $i by your chroot directory:
>> mount -t proc proc /srv/$i/proc/
>> mount -t sysfs sysfs /srv/$i/sys/
>> mount -t tmpfs tmpfs /srv/$i/dev/shm/
>> mount -t devpts devpts /srv/$i/dev/pts
>>
>> and finally chroot into your chroot-directory.
> This can also be avoided when setting up schroot which always mounts
> the necessary paths automatically.

Helge