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Old 09-20-2004, 02:21 PM   #1
LQ Newbie
Registered: Jan 2003
Location: Belgium (Wetteren)
Distribution: Red Hat Linux 7.3
Posts: 11

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Linker error

Hi ,

I have 3 smaal c programs and cpp programs
See below :
file reciprocal.hpp

#ifdef _cplusplus
extern "C" {

extern double reciprocal (int i);

#ifdef _cplusplus
file reciprocal.cpp
#include <cassert>
#include "reciprocal.hpp"

double reciprocal (int i) {
// I should be non-zero.
assert (i != 0);
return 1.0/i;
file main.c
#include <stdio.h>
#include "reciprocal.hpp"

int main(int argc, char **argv)
int i;
i = atoi (argv[1]);
printf("The reciprocal of %d is %g\n",i,reciprocal(i));
return 0;

First I compiler main.c with following command gcc -c main.c
Second I compiled reciprocal.cpp with following command g++ -c reciprocal.cpp
then I linked them together with g++ -o reciprocal main.o reciprocal.o.

I get following error after linking but don't understand what this means.

g++: main.o: No such file or directory
g++: reciprocal.o: No such file or directory
g++: no input files

Is this documented somewhere?
Can someone of the expert give me some help please?

Thanks in advance,

BTW I am follwing the instructions in the Advanced Linux Programming book


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