CODEWITHSUNDEEP
clinker-errorsundefined-reference
amanuel2
amanuel2

Reputation: 4646

undefined reference to `function'

For some reason the program is giving me this error

undefined reference to createNetworkDriver

Right now my folder structure is:

mini-kernel/
            kernel/
                   drivers/
                           network/
                                   network.h
                                   network.c
           util/
                errors/
                       errors.c
           main.c

network.h:

#ifndef _network_h_
#define _network_h_
#pragma once

#include <stdbool.h>
#include<stdint.h>

typedef struct
{
    char *name;
    bool initalized;
    int32_t status;
    int (*initalize)(void);
}NetworkDriver;

NetworkDriver* createNetworkDriver(void);
NetworkDriver* destroyNetworkDriver(NetworkDriver *self);
#endif

network.c:

#include "network.h"
#include "../../../util/errors/errors.c"

extern void die(const char *message);

NetworkDriver* createNetworkDriver(void)
{
    printf("Working");
    NetworkDriver nd = malloc(sizeof(NetworkDriver));
}

NetworkDriver* destroyNetworkDriver(NetworkDriver *self)
{
    if(self->initalized == true)
        free(self);
    else
        die("NET_DRIVER FAILED TO DESTROY");

}

errors.c:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

void die(const char *message)
{
    if(errno) {
        perror(message);
    } else {
        printf("ERROR: %s\n", message);
    }

    exit(1);
}

And finally my main.c:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "kernel/drivers/network/network.h"


int main(int argc, char *argv[])
{
    NetworkDriver *nd = createNetworkDriver();
}

And for some reason when i run the main.c file gcc main.c -std=c99 -w -lm , i get the error: undefined reference to createNetworkDriver.

Im currently programming this online here.

Upvotes: 1

Views: 2514

Answers (1)

Some programmer dude
Some programmer dude

Reputation: 409136

You need to build with all source files. Just including a header file is not enough for the compiler and linker to know which files you really need.

So do something like this instead:

$ gcc main.c util/errors/errors.c kernel/drivers/network/network.c -std=c99 -o my_kernel -w -lm

This will build each source file into a (temporary) object file and link all the object files together into a single executable file named my_kernel (specified using the -o option).

Upvotes: 3

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