Чертовщина с #include guards и #pragma once

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
 
#include "var.h"
#include "prf.h"
 
int main()
{
    printf("addresses of statics\n");
    printf("0x%08X = 0x%08X\n", (uint32_t)&staticX, staticX);
    printf("0x%08X = 0x%08X\n", prf(), staticX);
    //printf("0x%08X = 0x%08X\n", (uint32_t)pStaticX, *pStaticX);
    //printf("0x%08X = 0x%08X\n", (uint32_t)pStaticY, *pStaticY);
    getch();
    return 0;
}

#include "prf.h"
 
extern const uint32_t* pStaticX;
 
uint32_t prf(void)
{  
    return (uint32_t)pStaticX;  // &staticX;
}

#ifndef PRF_H
#define PRF_H
//=======================================================
 
#include "var.h" // <----- если закомментарить - undefined reference to `pStaticX' в prf.c 
#include <stdint.h>
 
uint32_t prf(void);         
 
//=======================================================
#endif // PRF_H

#ifndef VAR_HEADER
#define VAR_HEADER    
 
//-------------------------
#include <stdint.h>
 
static const uint32_t staticX = 0x12345678;
static const uint32_t* pStaticX = &staticX;
 
//-------------------------
#endif // VAR_HEADER

#include "global_var.h"
 
int main()
{
    uint32_t v1=global_var_1;
    uint32_t v2=global_var_2_reference();
}