如何在 cmake 中使用 SDL2 和 SDL_image [英] How to use SDL2 and SDL_image with cmake

问题描述

我正在寻找使用 SDL2 和 SDL_image 和 cmake 编译 c++ 程序的最简单方法.

I'm looking for the simplest way to compile a c++ program using SDL2 and SDL_image with cmake.

经过数小时的搜索，这是我的最佳尝试:

Here is my best attempt, after hours of searching:

CMakeLists.txt

project(shooter-cmake2)

cmake_minimum_required(VERSION 2.8)

set(SOURCES
shooter.cpp
classes.cpp
utils.cpp
)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")

add_executable(${PROJECT_NAME} ${SOURCES})

INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2_image REQUIRED sdl2_image)
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS} ${SDL2IMAGE_INCLUDE_DIR})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${SDL2_LIBRARIES} ${SDL2IMAGE_LIBRARY})

我收到这些错误:

In function `loadTexture(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, SDL_Renderer*)':
undefined reference to `IMG_LoadTexture'
collect2: ld returned 1 exit status

这是函数调用:

#include "SDL.h"
#include "SDL_image.h"

SDL_Texture* loadTexture(const std::string &file, SDL_Renderer *ren){
    SDL_Texture *texture = IMG_LoadTexture(ren, file.c_str());
    texture != nullptr or die("LoadTexture");
    return texture;
}

我很绝望.请帮我！谢谢！:)

I am desperate. Please help me! Thanks! :)

推荐答案

我认为以下方法会起作用，因为它会在我的 ubuntu 系统上找到库，并且您提供的示例函数可以链接:

I think that the following will work, as it finds the libraries on my ubuntu system and the example function you provided can link:

project(shooter-cmake2)

cmake_minimum_required(VERSION 2.8)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")

add_executable(${PROJECT_NAME} src/test.cpp)

INCLUDE(FindPkgConfig)

PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2IMAGE REQUIRED SDL2_image>=2.0.0)

INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS} ${SDL2IMAGE_INCLUDE_DIRS})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${SDL2_LIBRARIES} ${SDL2IMAGE_LIBRARIES})

如果使用 --debug-output 执行 cmake，它会输出:

If cmake is executed with --debug-output it outputs:

-- Found PkgConfig: /usr/bin/pkg-config (found version "0.26") 
Called from: [2]    /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake
            [1] $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
-- checking for one of the modules 'sdl2'
Called from: [1]    $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt
-- checking for one of the modules 'SDL2_image>=2.0.0'
Called from: [1]    $USER/stack-overflow/cmake-sdl2-image/CMakeLists.txt

这让我检查了

/usr/lib/x86_64-linux-gnu/pkgconfig/sdl2.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/SDL2_image.pc

我注意到 SDL2_image.pc 包含名称:SDL2_image我认为应该将第三个参数与此库的 PKG_SEARCH_MODULE 匹配.

I noticed that SDL2_image.pc contains Name: SDL2_image which I assumed should match the third parameter to PKG_SEARCH_MODULE for this library.

这篇关于如何在 cmake 中使用 SDL2 和 SDL_image的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！