Cross compile FreeBSD on amd64 for arm64 failes via compile determination error

[Gordon Bergling]

Hi Mark,

> Am 06.06.2020 um 11:56 schrieb Mark Murray <markm at FreeBSD.org>:
> 
> 
>> On 6 Jun 2020, at 00:25, Ian Lepore <ian at FreeBSD.org> wrote:
>> 
>> You cannot do that.  The installworld process uses a path that points
>> into the obj tree that got built (so that new binaries are used to do
>> the install work), and those binaries are compiled for the arch that
>> did the build.
> 
> That is my experience.
> 
> I used to work around a closely related problem when I built build* on
> a fast machine, and did the install* on the slow ones. As I was using
> automounts, I ended up with incompatible paths baked into the build,
> so I worked around those with symlinks.
> 
> I never tried this with anything other than i386/i386 or amd64/amd64,
> so the above is interesting. Could a viable cross-build* be "fixed" by
> symlinks, and somehow and easily forcing a cross-build of the bootstrap
> tools?
> 
> My RPis wish to know :-)
> 
> M
> —

In theory it should be possible to export the root filesystem of the RPIs and do a 

make installworld -DNOROOT DESTDIR=/exported/root/rpi-1

or something like this on the fast machine.

But for now I have started the build on the raspberry pi directly to stress test
it a bit. :)

-- Gordon