Incidentally, while we're sort of loosely on the subject, this is how far my 
pmax gets to linking a kernel from Dec 2nd sources:

ld -x -N -o netbsd -e start -Ttext 80030000 ${SYSTEM_OBJ} vers.o /usr/src/sys/lib/libkern/obj.pmax/libkern.a
machdep.o(.text+0x34): undefined reference to `_end'
machdep.o(.text+0x38): undefined reference to `_end'
machdep.o(.text+0x44): undefined reference to `_edata'
machdep.o(.text+0x48): undefined reference to `_edata'
trap.o(.text+0x2494): undefined reference to `_edata'
trap.o(.text+0x2498): undefined reference to `_edata'

Looks like the symbols in ouput files have no "_".  Seems fairly obvious but I haven't
had time to think about how to solve it.  Fwiw, I haven't even had time to use the 
restroom all day...