Thread: undefined reference error, please help me

Hi

I get following error while compiling using gcc in linux.

/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
/tmp/ccQKd0uk.o: In function `initweights':
weight.c.text+0xc6): undefined reference to `get_edge'
/tmp/ccQKd0uk.o: In function `weightedSelect':
weight.c.text+0x104): undefined reference to `ourrand'
/tmp/ccQKd0uk.o: In function `deindex':
weight.c.text+0x225): undefined reference to `sqrt'
/tmp/ccQKd0uk.o: In function `weighted_graph':
weight.c.text+0x5db): undefined reference to `set_edge'
weight.c.text+0x648): undefined reference to `get_edge'
weight.c.text+0x6f4): undefined reference to `get_edge'
collect2: ld returned 1 exit status

Thanks for your quick reply. I actually did not include main.c file which throw the error. Now I have following error.

error: conflicting types for âbzeroâ

Here is the code on the line where error occurs, given below.

extern void bzero(char *,int);


What could be the reason here?

Originally Posted by leo2008

Hi

I get following error while compiling using gcc in linux.

/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
/tmp/ccQKd0uk.o: In function `initweights':
weight.c.text+0xc6): undefined reference to `get_edge'
/tmp/ccQKd0uk.o: In function `weightedSelect':
weight.c.text+0x104): undefined reference to `ourrand'
/tmp/ccQKd0uk.o: In function `deindex':
weight.c.text+0x225): undefined reference to `sqrt'
/tmp/ccQKd0uk.o: In function `weighted_graph':
weight.c.text+0x5db): undefined reference to `set_edge'
weight.c.text+0x648): undefined reference to `get_edge'
weight.c.text+0x6f4): undefined reference to `get_edge'
collect2: ld returned 1 exit status

Your "did not include main.c" sounds fishy....as you're not supposed to.
List all your file names and what you are including from where.

Also, show your makefile or the command you are compiling with.

Originally Posted by TheBigH

The sqrt one at least should be easy to deal with. You need to include <math.h> in the source file that calls it, and then link it with the "-lm" command line argument when you compile.

I already included <math.h> in the source file as shown below. but it still gives me the same error.

#include <string.h>
#include <math.h>

extern void bzero(char *,int);