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https://github.com/arendst/Tasmota.git
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ad671a557c
* wrap printf with stubs * Remove flash savings message from wrap_printf Removed print statement indicating flash savings for ESP8266. * safe more by using rom function
44 lines
1.6 KiB
Python
44 lines
1.6 KiB
Python
# Wrap FILE*-based printf functions on ESP8266 to eliminate newlib's
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# _vfprintf_r (saves ~1.6 KB of flash).
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#
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# Tasmota's logging writes directly to the UART via Arduino's Serial, so the
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# libc FILE*-based printf path is dead code. By redirecting it through
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# vsnprintf() + fwrite() (already present for logging), the linker can drop
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# _vfprintf_r entirely.
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#
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# To opt out (keep the full newlib printf path), define USE_FULL_PRINTF in
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# build_flags for the affected env.
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import os
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Import("env")
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mcu = (env.get("BOARD_MCU") or "").lower()
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# Only act for ESP8266 builds.
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if mcu == "esp8266":
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build_flags = " ".join(env.get("BUILD_FLAGS") or [])
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if "USE_FULL_PRINTF" not in build_flags:
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# 1) Add the linker wrap flags so that any reference to printf /
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# vprintf / fprintf is redirected to our __wrap_* implementations.
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env.Append(LINKFLAGS=[
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"-Wl,--wrap=vprintf",
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"-Wl,--wrap=printf",
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"-Wl,--wrap=fprintf",
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])
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# 2) Compile the wrap stubs and link them into the firmware. The
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# source file lives next to this script in pio-tools/.
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stubs_src = os.path.join(env.subst("$PROJECT_DIR"), "pio-tools", "printf_stubs.cpp")
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if os.path.isfile(stubs_src):
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env.BuildSources(
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os.path.join("$BUILD_DIR", "printf_stubs"),
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os.path.dirname(stubs_src),
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src_filter=["-<*>", "+<printf_stubs.cpp>"],
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)
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else:
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print("wrap_printf: WARNING - printf_stubs.cpp not found at %s" % stubs_src)
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else:
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print("wrap_printf: USE_FULL_PRINTF defined - keeping full newlib printf path")
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