Using the same variable in different files (using extern)

2018-06-14 05:23:54

This question already has an answer here:

What is the effect of extern “C” in C++? 12 answers

The extern keyword should be placed in the header file, and the variable definition need only be in one source file, so what you want is this:

In Ah:

extern uchar *const x;
extern uchar *const y;

In Ac

uchar *const x;
uchar *const y;

In Bc

#include "A.h" 

void someFunction() {
    foo(x);
    bar(y);
}

In Cc

#include "A.h"

void someOtherFunction() {
    foo(x);
    bar(y);   
}

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