Undefined reference error (SOLVED)

Troubleshooting and Support
1

Tried putting all classes into their own hpp and cpp files, but somehow getting the following errors when using them
(first time using cpp and feel like thats the issue)

build/Main.o: in function `Controls::Controls()':
Main.cpp:39: undefined reference to `Controls::Switches'
Main.cpp:39: undefined reference to `Controls::Switches'
Main.cpp:39: undefined reference to `Controls::Switches'
Main.cpp:39: undefined reference to `Controls::Switches'
Main.cpp:39: undefined reference to `Controls::Switches'
Main.cpp:39: undefined reference to `Controls::encoder'
Main.cpp:39: undefined reference to `Controls::led'
Main.cpp:39: undefined reference to `Controls::Switches'

broken down all the files to only include whats needed to debug

Main.cpp

#include "Controls.hpp"

static Controls input;

Controls.hpp

#pragma once
#include "daisy_seed.h"

using namespace daisy;

class Controls
{
    protected:
        static Switch Switches[3][5];
        static Encoder encoder;
        static RgbLed led;

    public:
        Controls();
};

Controls.cpp

#include "Controls.hpp"
#include "daisy_seed.h"

using namespace daisy::seed;

Controls::Controls() {
    Switches[0][0].Init(D30); // Lower Row Left
    Switches[0][1].Init(D26);
    Switches[0][2].Init(D22);
    Switches[0][3].Init(D18);
    Switches[0][4].Init(D17); // Lower Row Right
    Switches[1][0].Init(D6); // Upper Row Left
    Switches[1][1].Init(D7);
    Switches[1][2].Init(D8);
    Switches[1][3].Init(D12);
    Switches[1][4].Init(D13); // Upper Row Right
    Switches[2][0].Init(D14); // Extra Left
    Switches[2][1].Init(D15); // Extra Right
    encoder.Init(D0, D2, D1);
    led.Init(D9, D10, D11, true);
}

Makefile

# Project Name
TARGET = ex_Looper

# Sources
CPP_SOURCES = Helper.cpp Controls.cpp Main.cpp

# the compiler: gcc for C program, define as g++ for C++
CC = g++

# Library Locations
LIBDAISY_DIR = ../../libDaisy
DAISYSP_DIR = ../../DaisySP

# Core location, and generic makefile.
SYSTEM_FILES_DIR = $(LIBDAISY_DIR)/core
include $(SYSTEM_FILES_DIR)/Makefile
2

guess it needed another day of coming up with search terms
found out that (cpp is annoying) and we need to declare our variables not only in the header file, but also in the implementation (cpp) file