zephyr/arch/arm/Makefile

KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) $(call cc-option,-fdata-sections,)

include $(srctree)/arch/$(ARCH)/soc/$(SOC_PATH)/Makefile

cflags-$(CONFIG_LTO) += $(call cc-option,-flto,)

cflags-cortex-m0 = $(call cc-option,-mabi=aapcs -mthumb -mcpu=cortex-m0) \
			$(call cc-option,-mthumb -march=armv6-m)
cflags-cortex-m0+ = $(call cc-option,-mabi=aapcs -mthumb -mcpu=cortex-m0plus) \
			$(call cc-option,-mthumb -march=armv6-m)
cflags-cortex-m1 = $(call cc-option,-mabi=aapcs -mthumb -mcpu=cortex-m1) \
			$(call cc-option,-mthumb -march=armv6-m)
cflags-cortex-m3 = $(call cc-option,-mabi=aapcs -mthumb -mcpu=cortex-m3) \
			$(call cc-option,-mthumb -march=armv7-m)
cflags-cortex-m4 = $(call cc-option,-mabi=aapcs -mthumb -mcpu=cortex-m4) \
			$(call cc-option,-mthumb -march=armv7e-m)
cflags-cortex-m7 = $(call cc-option,-mabi=aapcs -mthumb -mcpu=cortex-m7)

ifeq ($(CONFIG_FLOAT), y)
ifeq ($(CONFIG_FP_SOFTABI), y)
cflags-cortex-m4 += $(call cc-option,-mfloat-abi=softfp -mfpu=fpv4-sp-d16)
cflags-cortex-m7 += $(call cc-option,-mfloat-abi=softfp -mfpu=fpv5-d16)
endif
ifeq ($(CONFIG_FP_HARDABI), y)
cflags-cortex-m4 += $(call cc-option,-mfloat-abi=hard -mfpu=fpv4-sp-d16)
cflags-cortex-m7 += $(call cc-option,-mfloat-abi=hard -mfpu=fpv5-d16)
endif
endif

aflags-$(CONFIG_CPU_CORTEX_M0) += $(cflags-cortex-m0)
cflags-$(CONFIG_CPU_CORTEX_M0) += $(cflags-cortex-m0)
cxxflags-$(CONFIG_CPU_CORTEX_M0) += $(cflags-cortex-m0)

aflags-$(CONFIG_CPU_CORTEX_M0PLUS) += $(cflags-cortex-m0+)
cflags-$(CONFIG_CPU_CORTEX_M0PLUS) += $(cflags-cortex-m0+)
cxxflags-$(CONFIG_CPU_CORTEX_M0PLUS) += $(cflags-cortex-m0+)

aflags-$(CONFIG_CPU_CORTEX_M3) += $(cflags-cortex-m3)
cflags-$(CONFIG_CPU_CORTEX_M3) += $(cflags-cortex-m3)
cxxflags-$(CONFIG_CPU_CORTEX_M3) += $(cflags-cortex-m3)

aflags-$(CONFIG_CPU_CORTEX_M4) += $(cflags-cortex-m4)
cflags-$(CONFIG_CPU_CORTEX_M4) += $(cflags-cortex-m4)
cxxflags-$(CONFIG_CPU_CORTEX_M4) += $(cflags-cortex-m4)

aflags-$(CONFIG_CPU_CORTEX_M7) += $(cflags-cortex-m7)
cflags-$(CONFIG_CPU_CORTEX_M7) += $(cflags-cortex-m7)
cxxflags-$(CONFIG_CPU_CORTEX_M7) += $(cflags-cortex-m7)

KBUILD_AFLAGS += $(aflags-y)
KBUILD_CFLAGS += $(cflags-y)
KBUILD_CXXFLAGS += $(cflags-y)

soc-cxxflags ?= $(soc-cflags)
soc-aflags ?= $(soc-cflags)
KBUILD_CFLAGS += $(soc-cflags)
KBUILD_CXXFLAGS += $(soc-cxxflags)
KBUILD_AFLAGS += $(soc-aflags)