RIOT/cpu/atmega_common/Makefile.include

# Target architecture for the build. Use avr if you are unsure.
export TARGET_ARCH ?= avr

export CFLAGS_CPU = -mmcu=$(CPU) $(CFLAGS_FPU)
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 += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) -static -lgcc -e reset_handler -Wl,--gc-sections

# export the peripheral drivers to be linked into the final binary
export USEMODULE += atmega_common_periph
export USEMODULE += periph_common

# the atmel port uses stdio_uart
export USEMODULE += stdio_uart

# include module specific includes
export INCLUDES += -I$(RIOTCPU)/atmega_common/include -isystem$(RIOTCPU)/atmega_common/include/vendor

ifeq ($(LTO),1)
  # avr-gcc <4.8.3 has a bug when using LTO which causes a warning to be printed always:
  # '_vector_25' appears to be a misspelled signal handler [enabled by default]
  # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59396
  export LINKFLAGS += -Wno-error
endif

# Use ROM_LEN and RAM_LEN during link
# It is made optional until all boards are updated
LINKFLAGS += $(if $(ROM_LEN),$(LINKFLAGPREFIX)--defsym=__TEXT_REGION_LENGTH__=$(ROM_LEN))
LINKFLAGS += $(if $(RAM_LEN),$(LINKFLAGPREFIX)--defsym=__DATA_REGION_LENGTH__=$(RAM_LEN))

# Use newer linker script to have ROM/RAM configuration symbols in binutils<2.26
LDSCRIPT_COMPAT = $(if $(shell $(TARGET_ARCH)-ld --verbose | grep __TEXT_REGION_LENGTH__),,\
                    -T$(RIOTCPU)/$(CPU)/ldscripts_compat/avr_2.26.ld)
LINKFLAGS += $(LDSCRIPT_COMPAT)