config/bootstrap-cet.mk - binutils-gdb - Git at Google

 # This option enables -fcf-protection for stage2, stage3 and stage4.

 STAGE2_CFLAGS += -fcf-protection
 STAGE3_CFLAGS += -fcf-protection
 STAGE4_CFLAGS += -fcf-protection
	# This option enables -fcf-protection for stage2, stage3 and stage4.

	STAGE2_CFLAGS += -fcf-protection
	STAGE3_CFLAGS += -fcf-protection
	STAGE4_CFLAGS += -fcf-protection