Comment 1 for bug 786230

gcc -Wp,-MD,drivers/staging/wlan-ng/.p80211wep.o.d -nostdinc -isystem /usr/lib/gcc/i686-linux-gnu/4.6.0/include -I/home/teawater/kernel/linux-2.6/arch/x86/include -Iarch/x86/include/generated -Iinclude -I/home/teawater/kernel/linux-2.6/include -include include/generated/autoconf.h -I/home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng -Idrivers/staging/wlan-ng -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -m32 -msoft-float -mregparm=3 -freg-struct-return -mpreferred-stack-boundary=2 -march=i686 -mtune=core2 -mtune=generic -maccumulate-outgoing-args -Wa,-mtune=generic32 -ffreestanding -fstack-protector -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Wframe-larger-than=1024 -Wno-unused-but-set-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -pg -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -DCC_HAVE_ASM_GOTO -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(p80211wep)" -D"KBUILD_MODNAME=KBUILD_STR(prism2_usb)" -c -o drivers/staging/wlan-ng/.tmp_p80211wep.o /home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng/p80211wep.c
/home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng/p80211wep.c: In function 'wep_decrypt':
/home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng/p80211wep.c:229:1: internal compiler error: in form_sum, at reload.c:5331
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
make[3]: *** [drivers/staging/wlan-ng/p80211wep.o] Error 1
make[2]: *** [drivers/staging/wlan-ng/p80211wep.o] Error 2
make[1]: *** [sub-make] Error 2
make: *** [all] Error 2

I am not sure you can very easy reproduce this issue without all kernel source.