From coreboot

Disabling the stack protector in GCC

If compilation fails with errors like

 vtxprintf.c:(.text+0x4eb2): undefined reference to `__stack_chk_fail'

you will need to disable the stack protector that is now enabled by default in the version of GCC shipped with some distros (e.g. Ubuntu Feisty Fawn).

Compiling coreboot

You can disable the stack protector by changing the CC line in

 src/mainboard/YOURVENDORHERE/YOURMAINBOARDHERE/Options.lb

to

 default CC="$(CROSS_COMPILE)gcc -m32 -fno-stack-protector"

Compiling FILO

You can disable the stack protector by changing the CC line in

 makerules

to

 CC=gcc -m32 -fno-stack-protector