Teensy 2.0 increases Memory usage for Functions defined outside a Class

[ruiseixas]

Hi,

I was having some surprises in Memory Leakage recently, and then, I found out that the Teensy 2.0 increases RAM usage just for having a Function defined outside a Class.

Here is the testing code:

MemoryLeakage_Teensy_2.0.ino

#include <Arduino.h>
#include "UselessLibrary.h"

// Results in 9 bytes for 'true' and 9 bytes for 'false' for the Arduino Nano Board!
// Results in 22 bytes for 'true' and 54 bytes for 'false' but only in Teensy 2.0 Board!

#define LOCAL true

void setup() {
  // put your setup code here, to run once:
}

void loop() {
  
  char initiated_string[33] = "This results in Memory Leakage!!";

  if (LOCAL)
    LibraryClass::locallyDefinedFunction(initiated_string);
  else
    LibraryClass::externallyDefinedFunction(initiated_string);

}

UselessLibrary.h

#ifndef LIBRARYCLASS_H_INCLUDED
#define LIBRARYCLASS_H_INCLUDED

class LibraryClass {

  public:
    static void locallyDefinedFunction(char* const string_pointer) {
      // does nothing
    }
  
    static void externallyDefinedFunction(char* const string_pointer);
  
};

#endif // LIBRARYCLASS_H_INCLUDED

UselessLibrary.cpp

#include "UselessLibrary.h"

void LibraryClass::externallyDefinedFunction(char* const string_pointer) {
  // does nothing
}

Can someone explain how this can be solved? Thanks.