Can't build TEGRA kernel without DIAGNOSTIC

[John Klos <john%ziaspace.com@localhost>]

Just FYI - it seems that a TEGRA kernel won't compile without options 
DIAGNOSTIC:


--- fdtbus.o --- 
[113/1952]
#   compile  TEST/fdtbus.o
/usr/src/../tools/bin/armv7--netbsdelf-eabihf-gcc -mfloat-abi=soft 
-ffreestandin
g -fno-zero-initialized-in-bss -g -O2 -fno-strict-aliasing -fno-common 
-std=gnu9
9 -Werror -Wall -Wno-main -Wno-format-zero-length -Wpointer-arith 
-Wmissing-prot
otypes -Wstrict-prototypes -Wold-style-definition -Wswitch -Wshadow 
-Wcast-qual
-Wwrite-strings -Wno-unreachable-code -Wno-pointer-sign -Wno-attributes 
-Wno-sig
n-compare --sysroot=/usr/src/../dest-evbarm -mcpu=cortex-a15 -mfpu=neon 
-DKERNEL
_BASES_EQUAL -DKERNEL_BASE_VOFFSET=0 -I. 
-I/usr/src/sys/../common/lib/libx86emu
-I/usr/src/sys/../common/include -I/usr/src/sys/arch -I/usr/src/sys 
-nostdinc -D
__HAVE_CPU_COUNTER -D__HAVE_FAST_SOFTINTS -DKERNEL_BASE_EXT=0x80000000 
-D__HAVE_
PCI_CONF_HOOK -DARM_GENERIC_TODR -DCONSADDR=0x70006300 -D_KERNEL 
-D_KERNEL_OPT -
std=gnu99 -I/usr/src/sys/lib/libkern/../../../common/lib/libc/quad 
-I/usr/src/sy
s/lib/libkern/../../../common/lib/libc/string 
-I/usr/src/sys/lib/libkern/../../.
./common/lib/libc/arch/arm/string 
-I/usr/src/sys/external/isc/atheros_hal/dist -
I/usr/src/sys/external/isc/atheros_hal/ic 
-I/usr/src/sys/external/bsd/common/inc
lude -I/usr/src/sys/external/bsd/drm2/include 
-I/usr/src/sys/external/bsd/common
/include -I/usr/src/sys/external/bsd/drm2/include 
-I/usr/src/sys/external/bsd/dr
m2/include/drm -I/usr/src/sys/external/bsd/drm2/dist 
-I/usr/src/sys/external/bsd
/drm2/dist/include -I/usr/src/sys/external/bsd/drm2/dist/include/drm 
-I/usr/src/
sys/external/bsd/drm2/dist/uapi -I/usr/src/sys/external/bsd/common/include 
-D__K
ERNEL__ -DCONFIG_FB=0 -DCONFIG_BACKLIGHT_CLASS_DEVICE=0 
-DCONFIG_BACKLIGHT_CLASS
_DEVICE_MODULE=0 -I/usr/src/sys/external/bsd/drm2/dist/drm/nouveau 
-I/usr/src/sy
s/external/bsd/drm2/dist/drm/nouveau/core 
-I/usr/src/sys/external/bsd/drm2/dist/drm/nouveau/core/include 
-I/usr/src/sys/external/bsd/drm2/nouveau -DCONFIG_NOUVE
AU_DEBUG=5 -DCONFIG_NOUVEAU_DEBUG_DEFAULT=3 
-I/usr/src/sys/external/bsd/libfdt/d
ist -c /usr/src/sys/dev/fdt/fdtbus.c -o fdtbus.o
/usr/src/sys/dev/fdt/fdtbus.c: In function 'fdt_scan':
/usr/src/sys/dev/fdt/fdtbus.c:96:11: error: variable 'alen' set but not 
used [-W
error=unused-but-set-variable]
  int len, alen, child;
           ^
cc1: all warnings being treated as errors
*** [fdtbus.o] Error code 1

nbmake: stopped in /usr/obj-evbarm/sys/arch/evbarm/compile/TEST