fix for avr-gcc bug for multiple -lms

firmware/Makefile.inc

@@ -3,7 +3,7 @@ CFLAGS += -save-temps
 CFLAGS += -std=gnu99 -Wall # implements C99, for <util/atomic.h>
 # this removes dead code and does global linker optimization
 #CFLAGS += -ffunction-sections -Wl,--gc-sections -Wl,--relax 
-CFLAGS += -Wall -Os  -I. -mmcu=atmega88
+CFLAGS += -Wall -Os  -I. -mmcu=atmega88 -lm -ffunction-sections -fdata-sections
 
 # further optimization:
 #CFLAGS += --param inline-call-cost=2 

firmware/slavechip/Makefile

@@ -43,7 +43,7 @@ clean:
 
 # file targets:
 firmware.bin:	$(OBJECTS)
-	$(COMPILE) -o firmware.bin $(OBJECTS)
+	$(COMPILE) -lm -o firmware.bin -lm $(OBJECTS) -lm
 
 firmware.hex:	firmware.bin
 	rm -f firmware.hex firmware.eep.hex