Re: [avr-gcc-list] link problems

[Christof]

address@hidden schrieb:
> Dear All,
>
> I have installed binutils-2.15 (configuring with --prefix=/usr --target=avr
> --program-prefix="avr-"), gcc-3.4.3 (same configure options plus
> --enable-languages=c) and avr-libc-1.2.3 (with doconf --prefix=/usr
> --target=avr). I am running a fedora-core3.
>
> When I try to build a simple example program, it compiles fine (wiht avr-gcc -g
>  -mmcu=atmega8 leds.c -c -o leds), but then it seems that gcc is not able to
> link libc: when I try 
> avr-gcc -g  -mmcu=atmega8 leds.c -o leds
> I get:
> /home/enrico/led/leds.c:12: undefined reference to `cli'
> /tmp/cc0lcrTb.o(.text+0x16):/home/enrico/led/leds.c:14: undefined reference to
> `outp'
> /tmp/cc0lcrTb.o(.text+0x24):/home/enrico/led/leds.c:15: undefined reference to
> `outp'
> /tmp/cc0lcrTb.o(.text+0x32):/home/enrico/led/leds.c:17: undefined reference to
> `outp'
> /tmp/cc0lcrTb.o(.text+0x56): In function `test':
> /home/enrico/led/leds.c:29: undefined reference to `outp'
>
> any idea what the problem could be?
The linker complains that it cannot find outp.
This is because functions like outp, inp, sbi, cbi are no longer 
supported. I/O-Registers are directly accesible through their names, so 
you can easily write:

PORTB = 0xff;

for example. Look for "Special function registers" in the avr libc 
documentation.


--
Christof Krüger