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RIOT/makefiles/arch/cortexm.inc.mk
2019-01-21 17:04:20 +01:00

156 lines
5.1 KiB
Makefile

# Target triple for the build. Use arm-none-eabi if you are unsure.
export TARGET_ARCH ?= arm-none-eabi
# define build specific options
export CFLAGS_CPU = -mcpu=$(MCPU) -mlittle-endian -mthumb $(CFLAGS_FPU)
ifneq (llvm,$(TOOLCHAIN))
# Clang (observed with v3.7) does not understand -mno-thumb-interwork, only add if
# not building with LLVM
export CFLAGS += -mno-thumb-interwork
# work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85606
ifneq (,$(filter cortex-m0%,$(CPU_ARCH)))
CFLAGS_CPU += -march=armv6s-m
endif
endif
export CFLAGS_LINK = -ffunction-sections -fdata-sections -fno-builtin -fshort-enums
export CFLAGS_DBG ?= -ggdb -g3
export CFLAGS_OPT ?= -Os
export CFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT)
export ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG)
export LINKFLAGS += -L$(RIOTCPU)/$(CPU)/ldscripts -L$(RIOTCPU)/cortexm_common/ldscripts
export LINKER_SCRIPT ?= $(CPU_MODEL).ld
export LINKFLAGS += -T$(LINKER_SCRIPT) -Wl,--fatal-warnings
export LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) -static -lgcc -nostartfiles
export LINKFLAGS += -Wl,--gc-sections
# Tell the build system that the CPU depends on the Cortex-M common files:
export USEMODULE += cortexm_common
# Export the peripheral drivers to be linked into the final binary:
export USEMODULE += periph
# include common periph code
export USEMODULE += periph_common
export USEMODULE += cortexm_common_periph
# all cortex MCU's use newlib as libc
export USEMODULE += newlib
# set default for CPU_MODEL
export CPU_MODEL ?= $(CPU)
# extract version inside the first parentheses
ARM_GCC_VERSION = $(shell $(TARGET_ARCH)-gcc --version | sed -n '1 s/[^(]*(\([^\)]*\)).*/\1/p')
# Ubuntu bionic gcc-arm-none-eabi compiler is not supported
# Both when using gnu and llvm toolchains
#
# /usr/bin/arm-none-eabi-gcc --version | head -n 1
# arm-none-eabi-gcc (15:6.3.1+svn253039-1build1) 6.3.1 20170620
#
ARM_GCC_UNSUPPORTED += 15:6.3.1% # ubuntu bionic, ignore 'svn' build part
# Should not raise an error on the host system version when building in docker
ifneq (1,$(BUILD_IN_DOCKER))
ifneq (,$(filter $(ARM_GCC_UNSUPPORTED),$(ARM_GCC_VERSION)))
$(warning $(TARGET_ARCH)-gcc version not supported)
$(warning $(shell $(TARGET_ARCH)-gcc --version | head -n 1))
$(warning The currently recommanded version is the one installed in the riotdocker image)
$(warning https://github.com/RIOT-OS/riotdocker/blob/master/Dockerfile)
ifeq (1,$(WERROR))
$(error This check can be ignored by building with 'WERROR=0')
endif # WERROR
endif # ARM_GCC_UNSUPPORTED
endif # BUILD_IN_DOCKER
# Temporary LLVM/Clang Workaround:
# report cortex-m0 instead of cortex-m0plus if llvm/clang (<= 3.6.2) is used
# llvm/clang version 3.6.2 still does not support the cortex-m0plus mcpu type
ifeq (llvm,$(TOOLCHAIN))
ifeq (cortex-m0plus,$(CPU_ARCH))
LLVM_UNSUP = $(shell clang -target arm-none-eabi -mcpu=$(CPU_ARCH) -c -x c /dev/null -o /dev/null \
> /dev/null 2>&1 || echo 1 )
ifeq (1,$(LLVM_UNSUP))
CPU_ARCH = cortex-m0
endif
endif
endif
# export the CPU model and architecture
MODEL = $(shell echo $(CPU_MODEL) | tr 'a-z' 'A-Z')
export CFLAGS += -DCPU_MODEL_$(MODEL)
ARCH = $(shell echo $(CPU_ARCH) | tr 'a-z-' 'A-Z_')
export CFLAGS += -DCPU_ARCH_$(ARCH)
# set the compiler specific CPU and FPU options
ifneq (,$(filter $(CPU_ARCH),cortex-m4f cortex-m7))
ifneq (,$(filter cortexm_fpu,$(DISABLE_MODULE)))
export CFLAGS_FPU ?= -mfloat-abi=soft
else
USEMODULE += cortexm_fpu
# clang assumes there is an FPU
ifneq (llvm,$(TOOLCHAIN))
ifeq ($(CPU_ARCH),cortex-m7)
export CFLAGS_FPU ?= -mfloat-abi=hard -mfpu=fpv5-d16
else
export CFLAGS_FPU ?= -mfloat-abi=hard -mfpu=fpv4-sp-d16
endif
endif
endif
ifeq ($(CPU_ARCH),cortex-m4f)
export MCPU := cortex-m4
else
export MCPU ?= $(CPU_ARCH)
endif
else
CFLAGS_FPU ?= -mfloat-abi=soft
export MCPU ?= $(CPU_ARCH)
endif
# CMSIS DSP needs to know about the CPU core
ifneq (,$(filter cmsis-dsp,$(USEPKG)))
# definition needed to use cmsis-dsp headers
ifeq ($(CPU_ARCH),cortex-m0)
export CFLAGS += -DARM_MATH_CM0
else ifeq ($(CPU_ARCH),cortex-m0plus)
export CFLAGS += -DARM_MATH_CM0PLUS
else ifeq ($(CPU_ARCH),cortex-m3)
export CFLAGS += -DARM_MATH_CM3
else ifeq ($(CPU_ARCH),cortex-m4)
export CFLAGS += -DARM_MATH_CM4
else ifeq ($(CPU_ARCH),cortex-m4f)
export CFLAGS += -DARM_MATH_CM4
else ifeq ($(CPU_ARCH),cortex-m7)
export CFLAGS += -DARM_MATH_CM7
else ifeq ($(CPU_ARCH),cortex-m23)
export CFLAGS += -DARM_MATH_CM23
endif
endif
# Explicitly tell the linker to link the startup code.
# Without this the interrupt vectors will not be linked correctly!
VECTORS_O ?= $(BINDIR)/cpu/vectors.o
ifeq ($(COMMON_STARTUP),)
export UNDEF += $(VECTORS_O)
endif
# CPU depends on the cortex-m common module, so include it:
include $(RIOTCPU)/cortexm_common/Makefile.include
# use the nano-specs of Newlib when available
USEMODULE += newlib_nano
export USE_NANO_SPECS = 1
# Avoid overriding the default rule:
all:
# Rule to generate assembly listings from ELF files:
%.lst: %.elf
$(OBJDUMP) $(OBJDUMPFLAGS) $< > $@