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picolibc: USE_MODULE += printf_float for float printf/scanf code [v2]

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This makes RIOT use the integer-only printf/scanf code by default and
includes a new make parameter to select the full floating point
version. This saves about 6kB of text space when building hello-world
for the microbit board.

Signed-off-by: Keith Packard <keithp@keithp.com>

----

v2:
	Use USEMODULE=printf_float instead of separate parameter
This commit is contained in:
Keith Packard 2020-07-30 16:26:34 -07:00
parent e215261ced
commit 8c67544e7d
1 changed files with 4 additions and 0 deletions
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4
makefiles/libc/picolibc.mk
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@ -16,6 +16,10 @@ ifeq (1,$(USE_PICOLIBC))
LINKFLAGS += -Wl,--defsym=__heap_end=_eheap
LINKFLAGS += -Wl,--defsym=__heap_start=_sheap
CFLAGS += -specs=picolibc.specs
ifeq (,$(filter printf_float scanf_float,$(USEMODULE)))
CFLAGS += -DPICOLIBC_INTEGER_PRINTF_SCANF
LINKFLAGS += -DPICOLIBC_INTEGER_PRINTF_SCANF
endif
endif
LINKFLAGS += -lc