Since profiledbootstrap uses STAGEfeedback_CFLAGS = $(STAGE4_CFLAGS) -fprofile-use add STAGE4_CFLAGS += -fcf-protection -mcet to bootstrap-cet.mk to support profiledbootstrap with CET. PR bootstrap/85490 * bootstrap-cet.mk (STAGE4_CFLAGS): New. From-SVN: r259620