I still make my kernel by hand, in the live code tree.

I would like to make my kernels in the build process, preferably in the
OBJ tree.

is this doable/sensible?

right now, I do:

$ cat ~/bin/makeBSD 
#!/bin/sh

cd /usr/src
nice ./build.sh -u -x -M /data/Build/obj -T /data/Build/tools build \
        > /var/tmp/build.log 2>&1 & tail -f /var/tmp/build.log 
$ 

where /usr/src is a RO mount of the src hierarchy
(from /data/NetBSD/src, which is where I make kernels by hand)

 -G