b5fa28e2d4
For reasons discussed long ago and that have to do with how ld handles weak symbols, it was decided that it was preferable to link using an explicit list of object files, instead of adding object files to an archive first and then linking using this archive. This was applied for the CC2538, but not for CC13xx/CC26xx. This pull applies this link logic to all CM3s. For this to work with the Contiki-NG build system, we need `.SECONDEXPANSION:`, so this pull moves that to the common CM3 Makefile.
27 lines
776 B
Makefile
27 lines
776 B
Makefile
CONTIKI_ARM_DIRS += cortex-m/cm3
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CFLAGS += -mcpu=cortex-m3
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LDFLAGS += -mcpu=cortex-m3 -nostartfiles
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LDFLAGS += -T $(LDSCRIPT)
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LDFLAGS += -Wl,--gc-sections,--sort-section=alignment
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LDFLAGS += -Wl,-Map=$(@:.elf=-$(TARGET).map),--cref,--no-warn-mismatch
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OBJCOPY_FLAGS += --gap-fill 0xff
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### Build syscalls for newlib
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MODULES += os/lib/newlib
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CPU_STARTFILES = ${addprefix $(OBJECTDIR)/,${call oname, $(CPU_START_SOURCEFILES)}}
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### Compilation rules
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CUSTOM_RULE_LINK = 1
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.SECONDEXPANSION:
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%.elf: $(CPU_STARTFILES) $$(CONTIKI_OBJECTFILES) %.co $(PROJECT_OBJECTFILES) $(PROJECT_LIBRARIES) $(LDSCRIPT)
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$(TRACE_LD)
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$(Q)$(LD) $(LDFLAGS) ${filter-out $(LDSCRIPT) %.a,$^} ${filter %.a,$^} $(TARGET_LIBFILES) -lm -o $@
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include $(CONTIKI)/arch/cpu/arm/cortex-m/Makefile.cortex-m
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