Makefile.include.cortexm_common

# Target triple for the build. Use arm-none-eabi if you are unsure.
export TARGET_TRIPLE ?= arm-none-eabi

# Use TOOLCHAIN environment variable to select the toolchain to use.
# Default: gnu
TOOLCHAIN ?= gnu

# TOOLCHAIN = clang is an alias for TOOLCHAIN = llvm
ifeq (clang,$(TOOLCHAIN))
# use override so that we can redefine a variable set on the command line (as
# opposed to one set in the environment)
override TOOLCHAIN := llvm
endif
# TOOLCHAIN = gcc is an alias for TOOLCHAIN = gnu
ifeq (gcc,$(TOOLCHAIN))
# use override so that we can redefine a variable set on the command line (as
# opposed to one set in the environment)
override TOOLCHAIN := gnu
endif

export TOOLCHAIN

# default toolchain prefix, defaults to target triple followed by a dash, you
# will most likely not need to touch this.
export PREFIX ?= $(if $(TARGET_TRIPLE),$(TARGET_TRIPLE)-)

# 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_CPU  += -mno-thumb-interwork
endif
export CFLAGS_STYLE = -std=gnu99 -Wall -Wstrict-prototypes -Werror=implicit-function-declaration
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_STYLE) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT)

export ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DEBUG)
export LINKFLAGS += -L$(RIOTCPU)/$(CPU)/ldscripts -L$(RIOTCPU)/cortexm_common/ldscripts
export LINKFLAGS += -T$(RIOTCPU)/$(CPU)/ldscripts/$(CPU_MODEL).ld -Wl,--fatal-warnings
export LINKFLAGS += $(CFLAGS_DEBUG) $(CFLAGS_CPU) $(CFLAGS_STYLE) -static -lgcc -nostartfiles
export LINKFLAGS += -Wl,--gc-sections

# Import all toolchain settings
include $(RIOTBOARD)/Makefile.include.$(TOOLCHAIN)

# use the nano-specs of Newlib when available
ifeq ($(shell $(LINK) -specs=nano.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
export LINKFLAGS += -specs=nano.specs -lc -lnosys
endif

# export board specific includes to the global includes-listing
export INCLUDES += -I$(RIOTBOARD)/$(BOARD)/include