Thread: Linker Error

I have a source code file that will compile - but will not link. Linker error gives issues "undefined symbol", etc.

I have attached the files below...

If anyone wants to see if I am missing anything. The files have compiled perfectly in the past - the issue is that I have inherited all of this and need to make a slight adjustment to some of the code - an onscreen visual change - nothing "computational"

The system is old, the code is old, alas I know all this and as much as I wish it were not, it is what I have been left with.

Any assistance would be a great help.

How about posting some error messsages, or your compiler log?

I have inherited this dog's breakfast. From looking at the mak file should I be using something else? I am using what it was developed with to run on the systems that are still in place. It is old (I have sad this before) - I am just trying to solve the problem - that's all.

In principle, each one of the .h files in your zip file has a companion .c file or a companion .lib file.

Without either of these, you're pretty much stuck.

You need to go back to whoever gave you the code to find out where the extra files are.

As mentioned above, here are the files if anyone is curious enough to look.

Timothy

@tcpurvis
Do you know the difference between a .c file and a .h file?

Header files are for the compiler only, to tell it about things which exist elsewhere.

Code:

// this is magic.h
extern int magic;
void spell();

Code:

// this is wizard.c
#include "magic.h"
int main ( ) {
  if ( magic ) { spell(); }
  return 0;
}

Code:

// this is magic.c
#include "magic.h"
int magic = 1;
void spell ( ) {
  magic = 0;
}

Now, if your project contains only wizard.c, then it will compile just fine, but the linker will FAIL with unresolved symbols - EVEN though you have included the header file.

Until you tell the compiler about magic.c in some way, say by
- adding magic.c to the list of source files.
- adding magic.lib (containing previously compiled magic.c) to the linker library list
you're just going to be stuck where you are.