TODO revision 1.1 
1o Emit everything (ioconf.*, Makefile, ...) per-attribute.
2
3o Generate modular(9) related information.  Especially module dependency.
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5o Rename "interface attribute" to "bus".
6
7  Instead of
8
9	define	audiobus {}
10	attach	audio at audiobus
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12  Do like this
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14	defbus	audiobus {}
15	attach	audio at audiobus
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17o Sort objects in more reasonable order.
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19  Put machdep.ko in the lowest address.  uvm.ko and kern.ko follow.
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21  Kill alphabetical sort (${OBJS:O} in sys/conf/Makefile.inc.kern.
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23  Use ldscript.  Do like this
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25	.text :
26	AT (ADDR(.text) & 0x0fffffff)
27	{
28	  *(.text.machdep.locore.entry)
29	  *(.text.machdep.locore)
30	  *(.text.machdep)
31	  *(.text)
32	  *(.text.*)
33	  :
34
35  Kill linker definitions in sys/conf/Makefile.inc.kern.
36