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46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
# pylint: disable=E0602
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Import("env") # noqa
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# Remove float printf/scanf support from linker flags
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# The Arduino ESP8266 framework unconditionally adds:
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# -u _printf_float -u _scanf_float
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# This forces inclusion of float formatting code (~7KB) even when not used.
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#
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# ESPHome avoids %f format specifiers in logging to not require this code.
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# This script removes those flags to save flash space.
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#
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# Savings:
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# - _dtoa_r: ~3.4KB (double-to-ASCII conversion)
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# - _strtod_l: ~3.7KB (string-to-double conversion)
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# - _printf_float: ~1.3KB
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# - _scanf_float: ~1.3KB
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# - Additional float math helpers
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def remove_float_printf_flags(source, target, env):
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"""Remove -u _printf_float and -u _scanf_float from linker flags.
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This is called as a pre-action before the link step.
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"""
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linkflags = env.get("LINKFLAGS", [])
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new_linkflags = []
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i = 0
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while i < len(linkflags):
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flag = linkflags[i]
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if flag == "-u" and i + 1 < len(linkflags):
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next_flag = linkflags[i + 1]
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if next_flag in ("_printf_float", "_scanf_float"):
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print(f"ESPHome: Removing float printf support ({next_flag})")
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i += 2 # Skip both -u and the symbol
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continue
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new_linkflags.append(flag)
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i += 1
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env.Replace(LINKFLAGS=new_linkflags)
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# Register the callback to run before the link step
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# This ensures it runs after the framework has added its flags
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env.AddPreAction("$BUILD_DIR/${PROGNAME}.elf", remove_float_printf_flags)
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