Undefine reference error for static function

Question

I have below code and I am getting undefined reference to `StInit::instance()'

File StInit.h

class StInit
{
public:
static StInit* instance();
};

File StInit.cc

#include "StInit.h"

StInit*
StInit::instance()
{
    static StInit *myPtr = NULL;
    ......
    ......
    return myPtr;
}

File nm.cc

#include "StInit.h"
StInit* stor_init = StInit::instance();

I don't know why I am getting this error. How to resolve this error?

I am using tup based file system. So "tup upd" is my build command — eswaat, Dec 05 '14 at 23:12
What platform are you building on? Could you perhaps try building with something else and reproducing the problem? Can you use visual studio express for example? — David Woo, Dec 06 '14 at 00:33

score 0 · Answer 1 · answered Dec 05 '14 at 23:31

You are probably not including the 2nd file StInit.cc into the binary, hence the linker error. I am not familiar with tup, but looking at the manual it seems you need to include both the files in the tup file.

Look at the last example in this documentation: http://gittup.org/tup/ex_a_first_tupfile.html, just copying it as is should get you going.

So change the Tupfile to:

: foreach *.c |> gcc -Wall -c %f -o %o |> %B.o
: *.o |> gcc %f -o %o |> hello

And hello should have both the files compiled and linked in.

Nope. It's already in a good shape.Same as you mention. – eswaat Dec 05 '14 at 23:46 — eswaat, Dec 05 '14 at 23:46

Undefine reference error for static function

1 Answers1