In function `main':: undefined reference to ...

[Sriharsha]

Hi Laszlo,
   
    firstly, I suggest that you change the extension of your code files 
from .c to .cpp.

then, in your make file: Change:
g++ axf.c -o axf.o
to
g++ axf.cpp base.o -o axf.o

Harsha.

Graf LĂĄszlĂł wrote:

> Hi Gurus,
>
> I am Laszlo from Hungary.
> Please, take a look at these files:
>
> --- The main file 
> ---------------------------------------------------------------------
>     #include "stdio.h"
>     #include "stdlib.h"
>     #include "string.h"
>     #include "base.h"
>     
>     int main(int argc, char* argv[])
>     {
>         system("clear");
>         Base* b = new Base();
>         printf("\n---------- %s ---------------\n", b->toString());
>         delete b;
>         return 0;
>     }//main
>
> --- The base.h file 
> ---------------------------------------------------------------------
>     #ifndef __BASE
>         #define __BASE
>         class Base{
>             private:
>                 char* _str;
>
>             public:
>                 Base();
>                 Base(Base &);
>                 ~Base();
>
>                 char* toString();
>                 char* toHtml();
>         };
>     #endif
>
> --- The base.c file 
> ---------------------------------------------------------------------
>     #include "base.h"
>     using namespace std;
>
>     Base::Base(Base &s){
>     }
>
>     Base::~Base(){
>     }
>
>     char* Base::toString()
>     {
>         char* rv = "this is the toString()";
>         return rv;
>     }
>
>     char* Base::toHtml()
>     {
>         char* rv = "this is the toHtml()";
>         return rv;
>     }
>
> --- The Makefile file 
> ---------------------------------------------------------------------
>     compile :
>         g++ -c base.c -o base.o
>         g++ axf.c -o axf.o
>     
>     clear :
>         clear
>        
>     clean :
>         rm *.o
>     
>     run :
>         ./axf.o
>
> -------------------------------------------------------------------------------------------- 
>
> After the command
>     
>    make clear clean compile run
>
> I got these error messages:
>
>     rm *.o
>     g++ -c base.c -o base.o
>     g++ axf.c -o axf.o
>
>     /tmp/cc2K7HjB.o(.text+0x4a): In function `main':
>     : undefined reference to `Base::Base[in-charge]()'
>
>     /tmp/cc2K7HjB.o(.text+0x88): In function `main':
>     : undefined reference to `Base::toString()'
>     
>     /tmp/cc2K7HjB.o(.text+0xaf): In function `main':
>     : undefined reference to `Base::~Base [in-charge]()'
>     collect2: ld returned 1 exit status
>
>     make: *** [compile] Error 1
>
> Could somebody tell me what is wrong there?
> Thank you.


-- 
 *****************************
 * Sriharsha Vedurmudi			
 * Software Engineer		
 * 
 * Redpine Signals Inc.	
 * Gate #395, Plot 87,88			
 * Sagar Society, Road #2, 
 * Banjara Hills,		
 * Hyderabad - 500 034			
 * www.redpinesignals.com	
 *							
 * +91-40-23559911  (Office)
 * +91-98491-33133  (Mobile)
 *****************************