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From: Julian Elischer <julian@elischer.org>
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To: Olivier SMEDTS <olivier@gid0.org>
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Cc: virtualization@freebsd.org
Subject: Re: VIMAGE status
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Olivier SMEDTS wrote:
> 2009/5/2 Julian Elischer <julian@elischer.org>:
>> The VIMAGE code is nearly all in the the kernel.
>>
>> One is now able to make VIMAGE kernels (add options VIMAGE)
>> though they don't actually allow you to make multiple
>> vimages instances yet..
>>
>> The VIMAGE option enables all the low level changes needed
>> throughout the kernel.
>>

> Here is a warning I have when building kernel with options VIMAGE and INET6 :
> 
> cc -c -O2 -pipe -march=native -fno-strict-aliasing -std=c99 -g -Wall
> -Wredundant-decls -Wnested-externs -Wstrict-prototypes
> -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
> -Wno-pointer-sign -fformat-extensions -nostdinc  -I.  -I/work/src/sys
> -I/work/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
> -include opt_global.h -fno-common -finline-limit=8000 --param
> inline-unit-growth=100 --param large-function-growth=1000
> -mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2
> -mno-sse3 -mno-mmx -mno-3dnow  -msoft-float
> -fno-asynchronous-unwind-tables -ffreestanding -fstack-protector
> -Werror  /work/src/sys/netinet6/mld6.c
> cc1: warnings being treated as errors
> /work/src/sys/netinet6/mld6.c: In function 'vnet_mld_idetach':
> /work/src/sys/netinet6/mld6.c:3145: warning: unused variable 'vnet_inet6'
> *** Error code 1
> 

> 
> 

I assume you do not have INVARIANTS..

can you just put #ifdef INVARIANTS around that line and do the compile 
again?