2021-01-02 16:36:20 +01:00
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# include module specific includes
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INCLUDES += -I$(RIOTCPU)/avr8_common/include \
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-isystem$(RIOTCPU)/avr8_common/avr_libc_extra/include \
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-isystem$(RIOTCPU)/avr8_common/avr_libc_extra/include/vendor
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2021-09-28 12:35:43 +02:00
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ifneq (,$(filter printf_float,$(USEMODULE)))
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LINKFLAGS += -Wl,-u,vfprintf -lprintf_flt -lm
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endif
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cpu/avr8_common/flash_utils: use C and linker for aliases
`flash_<funcname>()` is implemented by `<funcname>_P()` provided by
the AVR libc on AVR targets. Previously, the preprocessor was used
to do the aliasing, but this causes issues with LLVM: The signatures of
e.g. `printf_P()` expects `const char *`, whereas flash utils expects
`FLASH_ATTR const char *`. For GCC this will just implicitly drop the
`FLASH_ATTR`, while it requires an explicit cast for LLVM.
To implement the explicit cast, `static inline` function wrappers
where used instead where possible. But for the variadic functions
(e.g. `printf(fmt, ...)`) the linker is used to provide the aliases,
as there is no way to pass the variadic functions throw in C. The
alternative would be to implement `flash_printf()` by calling
`vprintf_P()`, but that increased ROM size quite a bit.
Finally, a work around for a bug in Ubuntu's toolchain has been added:
An unused function that calls to `printf_P()`, `fprintf_P()` and
`snprintf_P()`. Since this function is garbage collected anyway, it
has no impact on the generated ELF file.
2023-11-10 11:13:22 +01:00
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# Add aliases for flash_printf, flash_fprintf, flash_snprintf:
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LINKFLAGS += -Wl,--defsym=flash_printf=printf_P
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LINKFLAGS += -Wl,--defsym=flash_fprintf=fprintf_P
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LINKFLAGS += -Wl,--defsym=flash_snprintf=snprintf_P
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2021-03-07 21:35:19 +01:00
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include $(RIOTMAKE)/arch/avr8.inc.mk
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