esp-idf/components/newlib/component.mk

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ifdef CONFIG_NEWLIB_NANO_FORMAT
LIBC := c_nano
else # CONFIG_NEWLIB_NANO_FORMAT
LIBC := c
endif # CONFIG_NEWLIB_NANO_FORMAT
# Order of linking matters: libnewlib.a should go before libc.a
COMPONENT_ADD_LDFLAGS := -lnewlib -l$(LIBC) -lm
COMPONENT_ADD_INCLUDEDIRS := platform_include
ifdef CONFIG_SPIRAM_CACHE_WORKAROUND
COMPONENT_ADD_LDFRAGMENTS := esp32-spiram-rom-functions-c.lf
endif
COMPONENT_PRIV_INCLUDEDIRS := priv_include
COMPONENT_SRCDIRS := . port
# Forces the linker to include heap, syscalls, and pthread from this component,
# instead of the implementations provided by newlib.
COMPONENT_ADD_LDFLAGS += -u newlib_include_heap_impl
COMPONENT_ADD_LDFLAGS += -u newlib_include_syscalls_impl
COMPONENT_ADD_LDFRAGMENTS += newlib.lf
heap.o: CFLAGS += -fno-builtin