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7c1949341e
Add `TARGET_ARCH_<ARCH>` for each architecture (e.g. `TARGET_ARCH_CORTEX` for Cortex M) to allow users to overwrite the target triple for a specific arch from ~/.profile or ~/.bashrc (or the like) without overwriting it for all others as well.
43 lines
1.8 KiB
Makefile
43 lines
1.8 KiB
Makefile
# Target architecture for the build. Use avr if you are unsure.
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TARGET_ARCH_AVR ?= avr
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TARGET_ARCH ?= $(TARGET_ARCH_AVR)
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CFLAGS_CPU = -mmcu=$(CPU) $(CFLAGS_FPU)
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CFLAGS_LINK = -ffunction-sections -fdata-sections -fno-builtin -fshort-enums
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CFLAGS_DBG ?= -ggdb -g3
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CFLAGS_OPT ?= -Os
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CFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT)
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ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG)
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LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) -static -lgcc -e reset_handler -Wl,--gc-sections
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OFLAGS += -j .text -j .data
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# explicitly tell the linker to link the syscalls and startup code.
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# without this the interrupt vectors will not be linked correctly!
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UNDEF += $(BINDIR)/atmega_common/startup.o
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# Use ROM_LEN and RAM_LEN during link
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$(if $(ROM_LEN),,$(error ROM_LEN is not defined))
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$(if $(RAM_LEN),,$(error RAM_LEN is not defined))
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LINKFLAGS += $(LINKFLAGPREFIX)--defsym=__TEXT_REGION_LENGTH__=$(ROM_LEN)$(if $(ROM_RESERVED),-$(ROM_RESERVED))
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LINKFLAGS += $(LINKFLAGPREFIX)--defsym=__DATA_REGION_LENGTH__=$(RAM_LEN)
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# Use newer linker script to have ROM/RAM configuration symbols in binutils<2.26
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LDSCRIPT_COMPAT = $(if $(shell $(TARGET_ARCH)-ld --verbose | grep __TEXT_REGION_LENGTH__),,\
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-T$(RIOTCPU)/$(CPU)/ldscripts_compat/avr_2.26.ld)
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LINKFLAGS += $(LDSCRIPT_COMPAT)
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# use the wrapper functions for following avr-libc functions
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LINKFLAGS += -Wl,-wrap=malloc -Wl,-wrap=calloc -Wl,-wrap=realloc -Wl,-wrap=free
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ifeq ($(LTO),1)
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# avr-gcc <4.8.3 has a bug when using LTO which causes a warning to be printed always:
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# '_vector_25' appears to be a misspelled signal handler [enabled by default]
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# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59396
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LINKFLAGS += -Wno-error
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endif
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OPTIONAL_CFLAGS_BLACKLIST += -Wformat-overflow
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OPTIONAL_CFLAGS_BLACKLIST += -Wformat-truncation
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OPTIONAL_CFLAGS_BLACKLIST += -gz
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