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https://github.com/zephyrproject-rtos/zephyr
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f3bf5abd52
If newlib is configured with --enable-newlib-nano-formatted-io,
floating-point support is split out of the formatted I/O code into
weak functions which are not linked by default. This leads to a smaller
code by about 16~20k when using newlib "printf" and/or "sscanf" but not
using floating point I/O.
Programs that need floating-point I/O support must explicitly request
linking of one or both of the floating-point functions:
_printf_float or _scanf_float.
This can be done at link time using the -u option which can be passed
to either gcc or ld.
Implemented via new configuration options:
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF
CONFIG_NEWLIB_LIBC_FLOAT_SCANF
Change-Id: I57f9d9f02e6d21d6011d14de7153b1d3ba6f6e32
Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
20 lines
354 B
Makefile
20 lines
354 B
Makefile
ifdef CONFIG_MINIMAL_LIBC
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ZEPHYRINCLUDE += -I$(srctree)/lib/libc/minimal/include
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endif
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ifdef CONFIG_NEWLIB_LIBC
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ZEPHYRINCLUDE += $(TOOLCHAIN_CFLAGS)
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ALL_LIBS += m c
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ifdef CONFIG_NEWLIB_LIBC_FLOAT_PRINTF
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LDFLAGS += -u _printf_float
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endif
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ifdef CONFIG_NEWLIB_LIBC_FLOAT_SCANF
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LDFLAGS += -u _scanf_float
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endif
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endif
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include $(srctree)/lib/iot/Makefile
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