kern/47094: unknown device acpiwmibus

[diro%nixsyspaus.org@localhost]

>Number:         47094
>Category:       kern
>Synopsis:       unknown device acpiwmibus
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 20 01:45:00 +0000 2012
>Originator:     diro%nixsyspaus.org@localhost
>Release:        NetBSD 6.0_RC1
>Organization:
>Environment:
System: NetBSD gift 6.0_RC1 NetBSD 6.0_RC1 (GIFT) #6: Sat Sep  1 04:44:23 UTC 
2012  root@gift:/usr/obj/sys/arch/amd64/compile/GIFT amd64
Architecture: amd64
Machine: amd64
>Description:
# dmesg | grep acpiwmibus
acpiwmibus at acpiwmi0 not configured

Oh? Let's fix that.
     
# egrep acpiwmibus /usr/src/sys/arch/amd64/conf/GIFT
acpiwmibus*     at acpiwmi?             # ACPI WMI Bus support
wmidell*        at acpiwmibus?          # Dell WMI mappings
wmieeepc*       at acpiwmibus?          # Asus Eee PC WMI mappings
wmihp*          at acpiwmibus?          # HP WMI mappings
wmimsi*         at acpiwmibus?          # MSI WMI mappings

Uncommented the first line there.
     
# ./build.sh -O /usr/obj -T /usr/tools kernel=GIFT
[...]
===> Build directory:     /usr/obj/sys/arch/amd64/compile/GIFT
(cd /usr/obj/sys/arch/amd64/compile/GIFT && rm -f a.out [Ee]rrs mklog core 
*.core .gdbinit || true)
/usr/src/sys/arch/amd64/conf/GIFT:297: acpiwmibus*: unknown device `acpiwmibus'
*** Stop.

ERROR: nbconfig failed for GIFT
*** BUILD ABORTED ***

>How-To-Repeat:
        I don't really understand this. How is acpiwmibus detected 
unconfigurated at
boot time, but cannot be added in the kernel config file? Moreover, why doesn't
build.sh complain if the initial acpiwmibus line is commented while its child
lines are left uncommented?
>Fix:
        NFI