multiple definition of `main' working with SDL_main - c++

Question

Basically im trying to create a game with SDL2 and Opengl, but I cant get passed this error. I've tried changing SDL_main(int argc, char *argv[]) to regular main but nothing changes. I know this error is due to the SDL_main library but I don't know how to fix it. I've been searching info for some hours now but can't figure it out, the only thing related to this problem I've found is this post, which didn't fix my problem.
Common.h
#ifndef _COMMON_H
#define _COMMON_H
/*=======STANDARD TEMPLATE LIBRARY=======*/
#include <iostream>
#include <string>
#include <cstdlib>
#include <memory>
#include <ctime>
#include <vector>
using namespace std;
/*=======GLU/GLEW=======*/
#include <GL/glew.h>
#include <GL/glu.h>
#include <GL/gl.h>
/*=======SDL2=======*/
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#include <SDL2/SDL_image.h>
/*=======CLASS DEFINITIONS=======*/
#endif
Main.cpp
#include "common.h"
bool isRunning = true;
int SDL_main(int argc, char *argv[])
{
//Error Checking/Initialisation
if (SDL_Init(SDL_INIT_NOPARACHUTE & SDL_INIT_EVERYTHING) != 0) {
SDL_Log("Unable to initialize SDL: %s\n", SDL_GetError());
return -1;
}
else
{
//Specify OpenGL Version (4.2)
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_Log("SDL Initialised");
}
//Create Window Instance
SDL_Window* window = SDL_CreateWindow(
"Game Engine",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
640,
480,
SDL_WINDOW_OPENGL
);
//Check that the window was succesfully created
if(window == NULL)
{
//Print error, if null
printf("Could not create window: %s\n", SDL_GetError());
return 1;
}
else
SDL_Log("Window Successful Generated");
//Map OpenGL Context to Window
SDL_GLContext glContext = SDL_GL_CreateContext(window);
//Render
//Swap Render Buffers
SDL_GL_SwapWindow(window);
//Free up resources
SDL_GL_DeleteContext(glContext);
SDL_Quit();
return 0;
}
Error output
./src/lib/SDL2main.lib(x64/Release/SDL_windows_main.obj):(.text[main]+0x0): multiple definition of `main'
C:/Program Files/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text.startup+0x0): first defined here
Makefile
all:
g++ -I ./src/include -L ./src/lib -o ./Builds/Win_Build/engine main.cpp -lmingw32 -lSDL2main -lSDL2 -lmingw32 -lopengl32 -lglew32 -lSDL2main -lSDL2 -lSDL2_image -lSDL2_ttf --verbose
Lib folder
EDIT:
I fixed it by redownloading the libraries and using the .a extension ones. And also I changed the version of Glew to 64 bits. My new lib folder: