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This packs the stdio implementation from [1] as alternative to what the used standard C lib provides with the intent to provide a thread-safe, smaller, and more feature-complete alternative on newlib targets. Compared to `newlib_nano` this reduces `.text` by a bit more than 200 B while adding support for standard format specifiers such as `RPIu8`, `PRIu16`, `PRIu64`, `%z`, and `%t`. Note that `newlib_nano`'s stdio can be thread-safe in reentrant mode at the cost of RAM (per thread) and latency. Especially the increase in latency can be prohibitive when real time requirements need to be met. [1]: https://github.com/mpaland/printf
18 lines
641 B
Makefile
18 lines
641 B
Makefile
# wrap stdio functions to use mpaland's printf instead of the one from the
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# standard C lib
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LINKFLAGS += -Wl,-wrap=printf
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LINKFLAGS += -Wl,-wrap=sprintf
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LINKFLAGS += -Wl,-wrap=snprintf
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LINKFLAGS += -Wl,-wrap=vprintf
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LINKFLAGS += -Wl,-wrap=vsnprintf
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LINKFLAGS += -Wl,-wrap=putchar
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LINKFLAGS += -Wl,-wrap=puts
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# Workaround for bug in the newlib headers shipped with e.g. Ubuntu 24.04 LTS
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# not defining PRId64 / PRIu64 / PRIx64 / PRIo64 in <inttypes.h> due to an issue
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# in <machine/_default_types.h>. Tested to cause no regression on fixed newlib
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# headers.
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ifneq (,$(filter newlib,$(FEATURES_USED)))
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CFLAGS += -D__int64_t_defined=1
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endif
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