35

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! :)

4

5 回答 5

54

我认为以下内容会起作用,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:

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:

-- 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 Name: SDL2_image 我认为应该将第三个参数与该库的 PKG_SEARCH_MODULE 匹配。

于 2014-05-25T17:35:48.090 回答
11

这里有两篇关于此的博客文章:

将 SDL2 与 CMake 一起使用

将 SDL2_image 与 CMake 一起使用

基本上你需要一个FindSDL2.cmakeFindSDL2_image.cmake模块。它们可以基于已包含在 CMake 中的适用于 SDL 1.2 的那些。使用这些 Find 模块也可以在 Windows 上使用。

如果您在 Linux 上并且只需要 SDL2,那么您甚至不需要,FindSDL2.cmake因为以下内容已经有效:

cmake_minimum_required(VERSION 3.7)

project(SDL2Test)

find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIRS})

add_executable(SDL2Test Main.cpp)
target_link_libraries(SDL2Test ${SDL2_LIBRARIES})
于 2017-07-04T08:26:04.450 回答
6

我对这些答案有疑问,我认为 cmake 改变了导入目标的方式。在@trenki 博客文章之后,我需要将我的 CMakeLists.txt 更改为:

project(SDL2Test)
find_package(SDL2 REQUIRED COMPONENTS SDL2::SDL2)
add_executable(SDL2Test main.cpp)
target_link_libraries(SDL2Test SDL2::SDL2)

目前这在 Arch Linux 上开箱即用。

于 2018-08-07T09:40:50.323 回答
5

我介绍了一种现代且可移植的方法来链接到 SDL2,SDL2_image。这些SDL2 CMake 模块可让您构建 SDL2 和 SDL2_image 项目,如下所示:

list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/sdl2)

find_package(SDL2 REQUIRED)
find_package(SDL2_image REQUIRED)
target_link_libraries(${PROJECT_NAME} SDL2::Main SDL2::Image)

您应该只在项目中克隆 repo:

git clone https://github.com/aminosbh/sdl2-cmake-modules cmake/sdl2

注意:如果 CMake 没有找到 SDL2/SDL2_image 库(在 Windows 中),我们可以指定 CMake 选项SDL2_PATHSDL2_IMAGE_PATH如下所示:

cmake .. -DSDL2_PATH="/path/to/sdl2" -DSDL2_IMAGE_PATH="/path/to/sdl2-image"

它还支持其他相关库:SDL2_ttf、SDL2_net、SDL2_mixer 和 SDL2_gfx。有关详细信息,请阅读README.md文件。

您可以在此处找到使用这些模块的示例/示例和项目列表:https ://github.com/aminosbh/sdl-samples-and-projects

于 2019-02-19T17:54:41.760 回答
0

以下命令对我来说很好用:

set(SDL_INCLUDE_DIR "/usr/include/SDL2")
set(SDL_LIBRARY "SDL2")
include(FindSDL)  

if(SDL_FOUND)  
  message(STATUS "SDL FOUND")
endif()
于 2019-01-15T01:09:10.803 回答