Cannot compile aarch64 kernel from FreeBSD host

[Benny Siegert <bsiegert%gmail.com@localhost>]

Hi!

I tried building a kernel for my Pinebook Pro from a FreeBSD host
(TrueNAS core, to be exact.) Unfortunately, the compiler chokes on
audiobell.c:

    compile  PBP64/audiobell.o
/usr/src/sys/dev/audio/audiobell.c:66:2: internal compiler error:
Illegal instruction
   66 |  A(        0),
      |  ^
no stack trace because unwind library not available
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://www.NetBSD.org/support/send-pr.html> for instructions.
--- audiobell.o ---

The command line I used was:

./build.sh -j 4 -N 1 -m evbarm -a aarch64 tools kernel=PBP64

ISTR that the same happened a while ago on FreeBSD 12. Any ideas what this is?

-- 
Benny