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tinyUSB/examples/build_system/make/cpu/cortex-m4.mk

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Makefile
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ifeq ($(TOOLCHAIN),gcc)
CFLAGS += \
-mthumb \
-mcpu=cortex-m4 \
-mfloat-abi=hard \
-mfpu=fpv4-sp-d16 \
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else ifeq ($(TOOLCHAIN),clang)
CFLAGS += \
--target=arm-none-eabi \
-mcpu=cortex-m4 \
-mfpu=fpv4-sp-d16 \
else ifeq ($(TOOLCHAIN),iar)
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CFLAGS += --cpu cortex-m4 --fpu VFPv4-SP
ASFLAGS += --cpu cortex-m4 --fpu VFPv4-SP
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else
$(error "TOOLCHAIN is not supported")
endif
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FREERTOS_PORTABLE_SRC ?= $(FREERTOS_PORTABLE_PATH)/ARM_CM4F