Question

I’ve been trying to compile a multi-file project, but every time I try to use a void in player.cpp, I keep getting this error message, which appears that the player.o that is created during compilation has the same definition of void player_action(…). When I tried to use a void in the other files, the same problem occurs, with their corresponding .o file. However, if I use structs in any of the files, no problems occurs, and no “multiple definition” error occurs. In the lines below is the error message the compiler is giving me.

obj\Debug\player.o: In function `Z13player_actioniii':
D:/Projects/Blackmail Mailman/player.cpp:13: multiple definition of `player_action(int, int, int)'
obj\Debug\main.o:D:/Projects/Blackmail Mailman/player.cpp:13: first defined here

This is the code from player.cpp I used:

#include "include_files.cpp"

struct player_struct
{
    int x;
    int y;
int previous_x;
int previous_y;
    int mode;
};

void player_action(int x, int y, int mode)
{
    SDL_Event event;
    if (SDL_PollEvent(&event))
    {
    if (event.type == SDL_KEYDOWN)
    {
        switch(event.key.keysym.sym)
        {
            case SDLK_RIGHT:;
        };
    };
    };
};

What could be wrong and how can I fix it? I’m using Codeblocks with Mingw and Windows XP. I already checked the other files and there aren’t any extra definitions of void player_action().

Answer 1

You never #include .cpp files, rather the .h files only.