Using SDL2 and Creating a Reusable "Engine" for Many Other Projects

Question

I'm not sure the term for what SDL2 is doing, but I was reading that it "hijacks" main.

I have a project called CoolGame and a project which I want to be reusable across many other games I make, called Engine.

Here is my engine.cpp

#include "engine.h"
using namespace engine;

Engine::Engine()
{
    window = NULL;
    renderer = NULL;
}

Engine::Engine(const char* title)
{
    SDL_Init(SDL_INIT_EVERYTHING);
    window = SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 600, 400, SDL_WINDOW_SHOWN);
    renderer = SDL_CreateRenderer(window, -1, 0);
}

void Engine::RenderThisFrame()
{
    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);

    SDL_RenderClear(renderer);

    SDL_RenderPresent(renderer);
}

Some of you may see where I am going. I am trying to make a nice Game Engine wrapper for sdl2. Here is my main in coolgame

#include "engine.h"
#include <iostream>
#undef main
using namespace std;
using namespace engine;

int main(int argc, const char* argv[]) {
    cout << "break main." << endl;
    Engine e = Engine("title");

    e.RenderThisFrame();
    return 0;
}

This does not work. I also have tried #undef in engine.h and I get the same error as below. LNK2019 unresolved external symbol _SDL_main referenced in function _main_utf8

When I take SDL.h and put it directly in coolgame it works as expected.

Is there anyway to stop SDL2 from hijacking main? Or is there any way to hoist that main hijack to the coolgame project? If that makes any sense

For austerity here is

engine.h

#ifndef ENGINE_CODE
#define ENGINE_CODE

#include "SDL.h"
#undef main
namespace engine {
    class Engine {
    public:
        Engine();
        Engine(const char* title);

        void RenderThisFrame();
    private:
        SDL_Window* window;
        SDL_Renderer* renderer;
    };
}
#endif

Edit

I am using Visual Studio 2019 for my IDE if that matters, I can provide C++ build tools version if requested.

Edit

I don't believe this question is exactly answered by another question. Here's why.

I have added SDL_MAIN_HANDLED and removed the #undefine main and it still didn't work.

I then moved all my engine code into the coolgame project with SDL_MAIN_HANDLED and main running as expected. Lo and behold it works, it has something to do with the projects being referenced. So this does not fix my original question. I am adding a Visual Studio tag. I have added the engine folder to the include directories in coolgame and I have also added packages/.../sdl to the include directories