-cflags-$(CONFIG_MARCH_G5) += $(call check_gcc,-march=g5,)
-cflags-$(CONFIG_MARCH_Z900) += $(call check_gcc,-march=z900,)
-cflags-$(CONFIG_MARCH_Z990) += $(call check_gcc,-march=z990,)
+cflags-$(CONFIG_MARCH_G5) += $(call cc-option,-march=g5)
+cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)
+cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)
+
+ifeq ($(call cc-option-yn,-mkernel-backchain),y)
+cflags-$(CONFIG_PACK_STACK) += -mkernel-backchain -D__PACK_STACK
+aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
+cflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
+aflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
+ifdef CONFIG_SMALL_STACK
+STACK_SIZE := $(shell echo $$(($(STACK_SIZE)/2)) )
+endif
+endif
+
+ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
+cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
+cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
+endif
+
+ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
+cflags-$(CONFIG_WARN_STACK) += -mwarn-dynamicstack
+cflags-$(CONFIG_WARN_STACK) += -mwarn-framesize=$(CONFIG_WARN_STACK_SIZE)
+endif