kernel build failure

At Thu Apr 12 17:52:05 EDT 2012:

[root_at_FBSD10 /usr/src]# svn up
Updating '.':
At revision 234196.

Trying to build the kernel I get the following failure:

time make -j8 buildkernel KERNCONF=MYKERNEL

<snip>

===> zlib (all)
cc -O2 -pipe -fno-strict-aliasing -Werror -D_KERNEL -DKLD_MODULE -nostdinc 
-DHAVE_KERNEL_OPTION_HEADERS -include 
/usr/obj/usr/src/sys/MYKERNEL/opt_global.h -I. -I_at_ -I_at_/contrib/altq 
-finline-limit=8000 --param inline-unit-growth=100 --param 
large-function-growth=1000 -fno-common -g -fno-omit-frame-pointer 
-I/usr/obj/usr/src/sys/MYKERNEL  -mcmodel=kernel -mno-red-zone -mno-mmx 
-mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding 
-fstack-protector -std=iso9899:1999 -fstack-protector -Wall 
-Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef 
-Wno-pointer-sign -fformat-extensions  -Wmissing-include-dirs 
-fdiagnostics-show-option   -c /usr/src/sys/modules/zlib/../../net/zlib.c
ld  -d -warn-common -r -d -o zlib.ko.debug zlib.o
:> export_syms
awk -f /usr/src/sys/conf/kmod_syms.awk zlib.ko.debug  export_syms | xargs 
-J% objcopy % zlib.ko.debug
objcopy --only-keep-debug zlib.ko.debug zlib.ko.symbols
objcopy --strip-debug --add-gnu-debuglink=zlib.ko.symbols zlib.ko.debug 
zlib.ko
1 error
*** [buildkernel] Error code 2
1 error
*** [buildkernel] Error code 2
1 error

real	8m20.095s
user	12m37.161s
sys	6m59.844s

I tried this 4 times, twice with MYKERNEL and twice with GENERIC.  It 
failed in the same spot every time.  Is anyone else seeing this?

Also, I tried without -j8, and it fails with the following:

cc -c -O2 -frename-registers -pipe -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  -Wmissing-include-dirs 
-fdiagnostics-show-option   -nostdinc  -I. -I/usr/src/sys 
-I/usr/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 
-fno-omit-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse 
-msoft-float  -fno-asynchronous-unwind-tables -ffreestanding 
-fstack-protector -Werror  /usr/src/sys/kern/subr_turnstile.c
cc1: warnings being treated as errors
/usr/src/sys/kern/subr_turnstile.c: In function 'propagate_priority':
/usr/src/sys/kern/subr_turnstile.c:220: warning: implicit declaration of 
function 'kdb_backtrace_thread'
/usr/src/sys/kern/subr_turnstile.c:220: warning: nested extern declaration 
of 'kdb_backtrace_thread' [-Wnested-externs]
*** [subr_turnstile.o] Error code 1

Stop in /usr/obj/usr/src/sys/MYKERNEL.
*** [buildkernel] Error code 1

Stop in /usr/src.
*** [buildkernel] Error code 1

Stop in /usr/src.

real	5m19.701s
user	4m33.051s
sys	0m51.466s



Here is /etc/make.conf

# cat /etc/make.conf
OVERRIDE_LINUX_BASE_PORT=f10
QT4_OPTIONS= QGTKSTYLE
WITH_OPENSSL_PORT=yes
# added by use.perl 2012-04-04 01:11:13
PERL_VERSION=5.14.2

The kernel previously built without problems with this same configuration.