adds newlib-nano settings

newlib-nano/lib.mk

@@ -0,0 +1,16 @@
+#CFLAGS+=--specs=nano.specs
+#LDFLAGS+=--specs=nano.specs
+#CFLAGS+=--specs=rv32imac/ilp32/nano.specs
+#LDFLAGS+=--specs=rv32imac/ilp32/nano.specs
+
+NANO_LIB_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
+NANO_LIB_SYMS := read write syscalls
+
+NANO_LIB_SRCS := $(foreach s,$(NANO_LIB_SYMS),$(NANO_LIB_DIR)/$(s).c)
+#NANO_LIB_SRCS := $(foreach f,$(LIB_SRCS),$(LIB_DIR)/$(f))
+NANO_LIB_OBJS := $(NANO_LIB_SRCS:.c=.o)
+
+CLEAN_OBJS += $(NANO_LIB_OBJS)
+
+$(NANO_LIB_OBJS): %.o: %.c $(HEADERS)
+	$(CC) $(CFLAGS) $(INCLUDES) -c -o $@ $<