Test case

testcase.cpp

//utils.h

#ifndef UTILS_H
#define UTILS_H

#include

struct Point2d
{
   float x;
   float y;

   void print()
   {
      std::cerr << x << "," << y << std::endl;
   }
};

void utilsFoo()
{
   int x = 2;
}

#endif

//foo.h

#include "utils.h"

#ifndef FOO_H
#define FOO_H

struct Foo
{
   int x;
   int y;
};

void foo(Point2d);

#endif

//foo.cpp

#include "utils.h"
#include "foo.h"

void foo(Point2d point)
{
   int x = 4;
   point.x = 5;
}

//main.cpp

#include "utils.h"
#include "foo.h"

int main()
{
   Foo foo = {1, 1};
}