Mess with library

Hi,
I am using the toolchain uClinux (m68k-uclinux-tools-20061214.sh) on a  
Debian (etch) host. The Target is a COBRA5282-Board which operates under  
dBUG. The Board came with an example that blinks with the LEDs on the  
board. The program links with its own target-specific startfile crt0_ram  
and no libraries. It compiles, links and I can download (using NFS) and  
execute it. So far so good. Then I wanted to create another example - a  
simple HelloWorld-Programm. But I get an error. The output is shown below:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
rwb@debi28:~/wso/helloworld$ make
/usr/local/bin/m68k-elf-gcc -Wa,-as -m5307 -c crt0_ram.S
68K GAS  /tmp/ccrsskya.s                        page 1


DEFINED SYMBOLS
                             *ABS*:00000000 crt0_ram.S
           crt0_ram.S:39     .text:00000000 _start

UNDEFINED SYMBOLS
main
/usr/local/bin/m68k-elf-gcc -g -m5307 -nostartfiles -c main.c
/usr/local/bin/m68k-elf-ld -T COBRA5282-ram.ld -M -o helloworld.elf  
crt0_ram.o main.o > helloworld.map
main.o: In function `main':
/home/rwb/wso/helloworld/main.c:5: undefined reference to `puts'
make: *** [helloworld.elf] Fehler 1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
It seems, something is wrong with the standard library. Who can help? So  
far I have found nothing that explains the linking process in some  
details. Yes, I have the ld-doc, but it does not explain the basics (which  
I am sorry to say - I do not know yet).

Regards Bob

The source (main.c) is shown below:
-----------------------------------------------
#include <stdio.h>

int main(void)
{
	printf("Hello World\n");
	return 0;
}
------------------------------------------------
The makefile, adapted from the led-example - is:
------------------------------------------------

GCC_EXEC_PREFIX = /usr/local/bin/m68k-elf-

CC = $(GCC_EXEC_PREFIX)gcc
AS = $(GCC_EXEC_PREFIX)as
LD = $(GCC_EXEC_PREFIX)ld
AR = $(GCC_EXEC_PREFIX)ar
OBJCOPY = $(GCC_EXEC_PREFIX)objcopy

PROGNAME = helloworld

TARGET = $(PROGNAME).s19
OBJS = crt0_ram.o main.o

CFLAGS += -g -m5307
# -g produces debugging options (native format)
# -m5307 selects the processor. this options is also ok for the MCF5282.
# the -as option for the assembler is nowhere documented
ASFLAGS += -Wa,-as -m5307

$(PROGNAME).s19: $(PROGNAME).bin
# objcopy converts the binary file to the srec format - .bin to .s19
	$(OBJCOPY) --input-target=binary --output-target=srec $(PROGNAME).bin  
$(PROGNAME).s19
# and the .s19-file is copied to our network-folder
	cp ${PROGNAME}.s19 /tftpboot

$(PROGNAME).bin: $(PROGNAME).elf
# create a binary file using the standard .elf-file as input
	$(OBJCOPY) -O binary $(PROGNAME).elf $@
# and copy the .bin-file to our network-folder
	cp ${PROGNAME}.bin /tftpboot

$(PROGNAME).elf: $(OBJS)
# Link the o-files into memory as specified in the .ld-file  
(linker-script-file)
	$(LD) -T COBRA5282-ram.ld -M -o $(PROGNAME).elf $(OBJS) > $(PROGNAME).map

.S.o:
	$(CC) $(ASFLAGS) -c $<
.c.o:
	$(CC) $(CFLAGS) -nostartfiles -c $<
#compile c-files, but no linking
crt0_ram.o: crt0_ram.S	

all:	$(TARGET)

clean:
	rm $(PROGNAME) *.o *.bin *.s19 *.map *.elf *.gdb -f

------------------------------------------------------------------
and the loader script (COBRA5282-ram.ld) is:
------------------------------------------------------------------

MEMORY {
      ram    : ORIGIN = 0x10000, LENGTH = 0x3e0000
}

SECTIONS {

         .text : {
		_stext = . ;
         	*(.text)
		_etext = ALIGN(0x4) ;
         } > ram

         .data BLOCK(0x4) : {
		_sdata = . ;
		__data_start = . ;
		*(.rodata)
         	*(.data)
		_edata = ALIGN(0x4) ;
         } > ram

         .bss BLOCK(0x4) : {
		_sbss = . ;
		*(.bss)
		*(COMMON)
		_ebss = ALIGN(0x4) ;
		_end = ALIGN(0x4) ;
	} > ram
     __main = main;

}
-------------------------------------------------------------

-- 
Bob Brusa                [email protected]
Chapfwiesenstr. 14       ph: +4144 926 74 74
CH-8712 Stäfa            fx:   +4144 926 73 34
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