c include thing

main.c

#include <stdio.h>

#include "pipe.h"
#include "patch.h" // only added to show it doesn't duplicate includes

int main(int argc, char** argv) {
  printf("main\r\n");
  imported_function(); // from patch.h->patch.c->imported_function
  other_source_function(); // second callt to imported_function but passed through pipe.c
}

Makefile

build:
	gcc -o bin main.c pipe.c patch.c
 
clean:
	rm -f bin

patch.c

#include <stdio.h>

// we don't need the func declaration when defining it as well (but it doesnt actually hurt either)
//#include "patch.h"

void imported_function(void) {
  printf("Called imported_function\r\n");
}

patch.h

#ifndef PATCH_H
#define PATCH_H

void imported_function(void);

#endif

pipe.c

#include <stdio.h>

#include "pipe.h"
#include "patch.h"

void other_source_function(void) {
  printf("Called source code func from pipe.c\r\n");
  imported_function(); // from patch.h->pathc.c->imported_function
}

pipe.h

#ifndef PIPE_H
#define PIPE_H

void other_source_function(void);

#endif