SDL2 libSDL2_image.so: 未定义引用

Question

我正在使用 Kubuntu 18.04

所以我最近尝试使用 SDL2，我想创建一个简单的 window 根据教程显示一些图片，但我无法编译示例代码。

当我尝试编译我得到的代码时：

/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libSDL2_image.so: undefined reference to `SDL_ceilf'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libSDL2_image.so: undefined reference to `SDL_acosf'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libSDL2_image.so: undefined reference to `SDL_floorf'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libSDL2_image.so: undefined reference to `SDL_fabsf'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libSDL2_image.so: undefined reference to `SDL_LoadFile_RW'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libSDL2_image.so: undefined reference to `SDL_fmodf'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libSDL2_image.so: undefined reference to `SDL_atan2f'
collect2: error: ld returned 1 exit status

使用的命令：

gcc SDLProject.c -o SDLProject `sdl2-config --cflags --libs` -lSDL2_gfx -lSDL2_image

用于安装 SDL2 库的命令：

sudo apt install libsdl2-dev libsdl2-gfx-dev libsdl2-image-dev libsdl2-ttf-dev libsdl2-mixer-dev

已安装的软件包：

sudo apt list --installed | grep "sdl"

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libsdl2-2.0-0/bionic-updates,now 2.0.8+dfsg1-1ubuntu1.18.04.3 amd64 [installed]
libsdl2-dev/bionic-updates,now 2.0.8+dfsg1-1ubuntu1.18.04.3 amd64 [installed]
libsdl2-gfx-1.0-0/bionic,now 1.0.4+dfsg-1 amd64 [installed,automatic]
libsdl2-gfx-dev/bionic,now 1.0.4+dfsg-1 amd64 [installed]
libsdl2-image-2.0-0/bionic,now 2.0.3+dfsg1-1 amd64 [installed,automatic]
libsdl2-image-dev/bionic,now 2.0.3+dfsg1-1 amd64 [installed]
libsdl2-mixer-2.0-0/bionic,now 2.0.2+dfsg1-2 amd64 [installed,automatic]
libsdl2-mixer-dev/bionic,now 2.0.2+dfsg1-2 amd64 [installed]
libsdl2-ttf-2.0-0/bionic,now 2.0.14+dfsg1-2 amd64 [installed,automatic]
libsdl2-ttf-dev/bionic,now 2.0.14+dfsg1-2 amd64 [installed]

我已经尝试删除与 SDL/SDL2 相关的所有内容，只重新安装项目使用的那些（SDL2、gfx 和图像），我发现这个错误只在我尝试时发生包含 SDL_image.h 并且我能够运行其他不使用它的示例代码。

我认为错误与代码本身无关，但是：

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL2_gfxPrimitives.h>
#include <stdlib.h>

typedef enum Babu {
    VKiraly, VVezer, VBastya, VFuto, VHuszar, VGyalog,
    SKiraly, SVezer, SSastya, SFuto, SHuszar, SGyalog
} Babu;

enum { MERET = 52 };


void babu_rajzol(SDL_Renderer *renderer, SDL_Texture *babuk, Babu melyik, int x, int y) {

    SDL_Rect src = { (melyik % 6) * 62 + 10, (melyik / 6) * 60 + 10, MERET, MERET };
    SDL_Rect dest = { x, y, MERET, MERET };
    SDL_RenderCopy(renderer, babuk, &src, &dest);
}


void sdl_init(int szeles, int magas, SDL_Window **pwindow, SDL_Renderer **prenderer) {
    if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
        SDL_Log("Nem indithato az SDL: %s", SDL_GetError());
        exit(1);
    }
    SDL_Window *window = SDL_CreateWindow("SDL peldaprogram", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, szeles, magas, 0);
    if (window == NULL) {
        SDL_Log("Nem hozhato letre az ablak: %s", SDL_GetError());
        exit(1);
    }
    SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);
    if (renderer == NULL) {
        SDL_Log("Nem hozhato letre a megjelenito: %s", SDL_GetError());
        exit(1);
    }
    SDL_RenderClear(renderer);

    *pwindow = window;
    *prenderer = renderer;
}


int main(int argc, char *argv[]) {
    SDL_Window *window;
    SDL_Renderer *renderer;
    sdl_init(320, 200, &window, &renderer);

    SDL_Texture *babuk = IMG_LoadTexture(renderer, "pieces.png");
    if (babuk == NULL) {
        SDL_Log("Nem nyithato meg a kepfajl: %s", IMG_GetError());
        exit(1);
    }

    boxRGBA(renderer, 0, 0, 319, 199, 0x90, 0xE0, 0x90, 0xFF);
    babu_rajzol(renderer, babuk, VKiraly, 82, 74);
    babu_rajzol(renderer, babuk, SGyalog, 82+MERET, 74);
    babu_rajzol(renderer, babuk, VHuszar, 82+2*MERET, 74);
    SDL_RenderPresent(renderer);

    SDL_DestroyTexture(babuk);

    SDL_Event event;
    while (SDL_WaitEvent(&event) && event.type != SDL_QUIT) {
    }

    SDL_Quit();
    return 0;
}

Answer 1

您没有得到包含 sdl-config 的 sdl 包。你可以从

sudo apt install libsdl1.2-dev

SDL2 libSDL2_image.so: 未定义引用

SDL2 libSDL2_image.so: undefined reference to

c

linux

gcc

sdl

ubuntu-18.04