如何使用SDL2和SDL_image与cmake [英] How to use SDL2 and SDL_image with cmake

问题描述

我正在寻找最简单的方法来使用 SDL2 和 SDL_image 与cmake编译c ++程序。

这是我最好的尝试，经过几个小时的搜索：

CMakeLists.txt

  project（shooter-cmake2）
 
 cmake_minimum_required（VERSION 2.8）
 
设定（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}）
  

我得到这些错误：

 在函数`loadTexture（std :: basic_string& ：char_traits< char>，std :: allocator< char> > const& SDL_Renderer *）'：
未定义引用`IMG_LoadTexture'
 collect2：ld返回1退出状态
  

这是函数调用：

  #includeSDL.h
＃ includeSDL_image.h
 
 SDL_Texture * loadTexture（const std :: string& file，SDL_Renderer * ren）{
 SDL_Texture * texture = IMG_LoadTexture（ren，file.c_str ; 
 texture！= nullptr或die（LoadTexture）; 
 return texture; 
} 
  

我绝望。请帮帮我！
谢谢！ ：）

解决方案

我觉得下面的工作，因为它发现我的Ubuntu系统中的磁带库，并且提供的示例功能可以链接：

 项目（shooter-cmake2）
 
 cmake_minimum_required（VERSION 2.8）
 
组（CMAKE_CXX_FLAGS$ {} CMAKE_CXX_FLAGS -std =的C ++ 0x）
 
 add_executable（$ {} PROJECT_NAME的src / TEST.CPP）
 
 INCLUDE （FindPkgConfig）
 
 PKG_SEARCH_MODULE（SDL2必填SDL2）
 PKG_SEARCH_MODULE（SDL2IMAGE必填SDL2_image> = 2.0.0）
 
 INCLUDE_DIRECTORIES（$ {SDL2_INCLUDE_DIRS} $ {SDL2IMAGE_INCLUDE_DIRS} ）
 TARGET_LINK_LIBRARIES（$ {PROJECT_NAME} $ {SDL2_LIBRARIES} $ {SDL2IMAGE_LIBRARIES}）
  

如果cmake使用--debug-output执行输出：

   - 找到PkgConfig：/ usr / bin / pkg-config发现版0.26）
从名为：[2] /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake 
 [1] $ USER /堆栈溢出/ cmake的-SDL2图像/的CMakeLists.txt 
  - 检查来自调用模块'SDL2'
中的一个：[1] $ USER /堆栈溢出/ cmake的-SDL2图像/的CMakeLists.txt 
  - 检查一个模块SDL2_image> = 2.0.0'
从名为：[1] $ USER /堆栈溢出/ cmake的-SDL2图像/的CMakeLists.txt 
  
 
 
 
这让我检查
的内容
 
 
  /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 
我认为应该匹配第三个参数PKG_SEARCH_MODULE该库
 
I'm looking for the simplest way to compile a c++ program using SDL2 and SDL_image with cmake.

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})
I get these errors:
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
Here is the function call:
#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;
}
I am desperate. Please help me!
Thanks! :)
解决方案
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})
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
This made me check the contents of 
/usr/lib/x86_64-linux-gnu/pkgconfig/sdl2.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/SDL2_image.pc
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.

                        
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