Unable to link to SDL2 functions using MinGW - c++

Question

I'm relatively new to programming and I've decided to give SDL a try, but I'm a bit stuck. I haven't been able to build the project in codeblocks and I get 'undefined reference' to all SDL functions. I've seen a lot of similar questions here, but none of the solutions seems to help. I've already added the \include\SDL2 and the \lib folders to search directories, I've added SDL2Main and SDL2 to link libraries in linker options, I've even added -mwindows to other linker options. Also, I tried linking against the 64-bit version as well, but things got even worse.
Here's my source code, pretty much copied straight out of the tutorial I started:
#include <SDL.h>
SDL_Window* g_pWindow = 0;
SDL_Renderer* g_pRenderer = 0;
int main(int argc, char* args[])
{
// initialize SDL
if(SDL_Init(SDL_INIT_EVERYTHING) >= 0)
{
// if succeeded create our window
g_pWindow = SDL_CreateWindow("Chapter 1: Setting up SDL",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
640, 480,
SDL_WINDOW_SHOWN);
// if the window creation succeeded create our renderer
if(g_pWindow != 0)
{
g_pRenderer = SDL_CreateRenderer(g_pWindow, -1, 0);
}
}
else
{
return 1; // sdl could not initialize
}
// everything succeeded lets draw the window
// set to black // This function expects Red, Green, Blue and
// Alpha as color values
SDL_SetRenderDrawColor(g_pRenderer, 0, 0, 0, 255);
// clear the window to black
SDL_RenderClear(g_pRenderer);
// show the window
SDL_RenderPresent(g_pRenderer);
// set a delay before quitting
SDL_Delay(5000);
// clean up SDL
SDL_Quit();
return 0;
}
And here's the build log:
mingw32-g++.exe -LC:\dev\sdl\SDL2-2.0.1\x86_64-w64-mingw32\lib -o bin\Debug\GeometryProject.exe obj\Debug\main.o -mwindows C:\MinGW\lib\libmingw32.a C:\dev\sdl\SDL2-2.0.1\x86_64-w64-mingw32\lib\libSDL2main.a C:\dev\sdl\SDL2-2.0.1\x86_64-w64-mingw32\lib\libSDL2.a
obj\Debug\main.o: In function `SDL_main':
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:7: undefined reference to `SDL_Init'
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:13: undefined reference to `SDL_CreateWindow'
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:17: undefined reference to `SDL_CreateRenderer'
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:27: undefined reference to `SDL_SetRenderDrawColor'
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:29: undefined reference to `SDL_RenderClear'
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:31: undefined reference to `SDL_RenderPresent'
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:33: undefined reference to `SDL_Delay'
C:/Users/Kris948/Desktop/ProjectsUni/GeometryProject/main.cpp:35: undefined reference to `SDL_Quit'
C:\MinGW\lib\libmingw32.a(main.o):main.c:(.text.startup+0xa7): undefined reference to `WinMain#16'
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 0 seconds)
9 errors, 0 warnings (0 minutes, 0 seconds)
Is there anything else I could try? I really would like to get this running and would appreciate any help.

Answer 1

A possible problem is that your linking to a SDL2 library for a different architecture.
You should be using
SDL2-2.0.1\i686-w64-mingw32
instead of
SDL2-2.0.1\x86_64-w64-mingw32
Also after setting the library search path use this notation to link to libraries
-lmingw32 -lSDL2main -lSDL2
It's much easier to read.

Answer 2

Instead of adding full path, try -LC:/PATH_TO_SDL -lSDL2main -lSDL2 (or only one SDL option) instead; the lib and .a is already known by the linker.
(not sure if you have to use either / or \)
Since you are using C++, replace your include with this:
extern "C"
{
#include "SDL.h"
}
This tells the compiler to treat SDL as C - and not C++ - code.
See also: SDL2 won't link properly