From: "Bill Blough" <NOSPAM DOT b_blough AT hotmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Newbie Linker Problems
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Date: Mon, 12 Mar 2001 06:38:02 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com


I'm currently learning C++ by reading, doing end of chapter exercises, and
occasionally a side project of my own.

I'm getting linker errors when I try and compile a program I wrote for one
of the end of chapter exercises.  After hours troubleshooting my own code, I
downloaded the exercise solution from the publisher's website.  That code
won't compile either, so I guss it's not my code.

It's a Windows 98 system.  I'm using a text editor for coding and doing
compilation from a command prompt.  LFN support is enabled.

my command line is:         gxx main.cpp -o main.exe

After reading the FAQ, I also tried:        gxx -O2 main.cpp -o main.exe

The error is:

----------------------------------------------------------------------

/DJGPP/tmp\ccZ2XPu0.o(.text+0x90):main.cpp: undefined reference to
`printthis(basic_string<char, string_char_traits<char>,
__default_alloc_template<false, 0> > const &)'
/DJGPP/tmp\ccZ2XPu0.o(.text+0xd4):main.cpp: undefined reference to
`printthat(basic_string<char, string_char_traits<char>,
__default_alloc_template<false, 0> > const &)'
collect2: ld returned 1 exit status

----------------------------------------------------------------------

The source is:

----------------------------------------------------------------------

// print.h
#ifndef PRINT_H
#define PRINT_H

#include <string>
using namespace std;

// Function prototype
void print(const string& s);

#endif

----------------------------------------------------------------------

// print.cpp
#include "print.h"
#include <string>
#include <iostream>
using namespace std;

void print(const string& s)
{
  cout << s << endl;
}

----------------------------------------------------------------------

// printthis.h
#ifndef PRINTTHIS_H
#define PRINTTHIS_H

#include <string>
using namespace std;

// Function prototype
void printthis(const string& s);

#endif

-----------------------------------------------------------------------

// printthis.cpp
#include "printthis.h"
#include "print.h"

void printthis(const string& s)
{
  print(s);
}

-------------------------------------------------------------------------

// printthat.h
#ifndef PRINTTHAT_H
#define PRINTTHAT_H

#include <string>
using namespace std;

// Function prototype
void printthat(const string& s);

#endif

------------------------------------------------------------------------

// printthat.cpp
#include "printthat.h"
#include "print.h"

void printthat(const string& s)
{
  print(s);
}

-----------------------------------------------------------------------


// main.cpp
#include "printthis.h"
#include "printthat.h"

int main()
{
  printthis("This is a test string using printthis().");
  printthat("This is a test string using printthat().");

  return 0;
}

----------------------------------------------------------------------


Any info relating to the problem, or advice on how to fix it or where to
look, would be greatly appreciated.  Other info/advice may be appreciated,
but possibly to a lesser degree :-)

Thanks in advance.

Bill Blough