I'm getting this error when I run make on my project. I think it's got something to do with floating point math libraries. Any idea what's causing it?

Here's the error message:

avr-gcc -g -Os -Wall -mmcu=atmega168 -Wl,-u,vfprintf -lprintf_flt -Wl,-u,vfscanf -lscanf_flt -lm -o enlarger.o avr_control.o controller.o main.o ../Code/libnerdkits/delay.o ../Code/libnerdkits/lcd.o ../Code/libnerdkits/uart.o
/usr/lib/gcc/avr/4.3.4/../../../avr/lib/avr5/libc.a(inverse.o):../../../libm/fplib/inverse.S:50: relocation truncated to fit: R_AVR_13_PCREL against symbol `__divsf3' defined in .text section in /usr/lib/gcc/avr/4.3.4/avr5/libgcc.a(_div_sf.o)
/usr/lib/gcc/avr/4.3.4/../../../avr/lib/avr5/libc.a(log.o):../../../libm/fplib/log.S:94: relocation truncated to fit: R_AVR_13_PCREL against symbol `__addsf3' defined in .text section in /usr/lib/gcc/avr/4.3.4/avr5/libgcc.a(_addsub_sf.o)
/usr/lib/gcc/avr/4.3.4/../../../avr/lib/avr5/libc.a(log.o):../../../libm/fplib/log.S:98: relocation truncated to fit: R_AVR_13_PCREL against symbol `__addsf3' defined in .text section in /usr/lib/gcc/avr/4.3.4/avr5/libgcc.a(_addsub_sf.o)
/usr/lib/gcc/avr/4.3.4/../../../avr/lib/avr5/libc.a(modf.o):../../../libm/fplib/modf.S:87: relocation truncated to fit: R_AVR_13_PCREL against symbol `__subsf3' defined in .text section in /usr/lib/gcc/avr/4.3.4/avr5/libgcc.a(_addsub_sf.o)
make: *** [enlarger.o] Error 1
make: Target `all' not remade because of errors.

And here's my Makefile:

GCCFLAGS=-g -Os -Wall -mmcu=atmega168
LINKFLAGS=-Wl,-u,vfprintf -lprintf_flt -Wl,-u,vfscanf -lscanf_flt -lm
AVRDUDEFLAGS=-c avr109 -p m168 -b 115200 -P /dev/ttyUSB0
LINKOBJECTS=../Code/libnerdkits/delay.o ../Code/libnerdkits/lcd.o ../Code/libnerdkits/uart.o

all:    enlarger-upload

enlarger.hex: enlarger.o
    avr-objcopy -j .text -O ihex enlarger.o enlarger.hex

enlarger.o: avr_control.o controller.o main.o
    make -C ../Code/libnerdkits
    avr-gcc ${GCCFLAGS} ${LINKFLAGS} -o enlarger.o avr_control.o controller.o main.o ${LINKOBJECTS}

avr_control.o: avr_control.c
    avr-gcc ${GCCFLAGS} -o avr_control.o -c avr_control.c
controller.o: controller.c
    avr-gcc ${GCCFLAGS} -o controller.o -c controller.c
main.o: main.c
    avr-gcc ${GCCFLAGS} -o main.o -c main.c

enlarger.ass: enlarger.hex
    avr-objdump -S -d enlarger.o > enlarger.ass

enlarger-upload: enlarger.hex
    avrdude ${AVRDUDEFLAGS} -U flash:w:enlarger.hex:a

I'm using emacs on Ubuntu Linux as my development environment. Any suggestions appreciated.

Hi mickdoe,

See this thread. Apparently, changing the order of some of the library linking (putting the "-lm" somewhere else in the Makefile) should let you get a successful compile. Let me know if that works!

Mike

Thanks Mike. I tried moving -lm around to several places and eventually got it to work like this:

avr-gcc -lm ${GCCFLAGS} ${LINKFLAGS} -o enlarger.o avr_control.o controller.o main.o -lm ${LINKOBJECTS}