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

[Rodney W. Grimes]

> 
> > On 6 Jun 2020, at 19:26, Mark Murray <markm at FreeBSD.org> wrote:
> > 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 :-)
> 
> I've done 'make installworld DESTDIR=/tmp/armdest' on the fast machine then copied it over with tar to the slow one and it seemed to work OK.
> 
> Being able to installworld with src/obj NFS mounted would be nice though.

Idea: It would be nice if we could do what you just did, then export
/tmp/armdest via NFS, then on arm system mount host:/tmp/armdest /tmp/armdest
and the src and obj trees.  And then somehow run a make installworld TOOLSDIR=/tmp/armdest,
this would solve your problem with what I believe to be a very mininmal
change/enhancement to the make system.

-- 
Rod Grimes                                                 rgrimes at freebsd.org