How to Solve Undefined Reference Error When Using SDL2 and SDL_image with CMake?

How to Use SDL2 and SDL_image with CMake (Solved Errors)

In this guide, we'll provide a solution for the issue faced when trying to use SDL2 and SDL_image with CMake.

Original Problem:

When attempting to compile a C program using SDL2 and SDL_image with CMake, an undefined reference to IMG_LoadTexture was encountered.

Improved Solution:

To address this issue, we can modify the CMakeLists.txt as follows:

<code class="cmake">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})</code>

Explanation:

• We use FindPkgConfig to locate and use the appropriate system libraries.
• PKG_SEARCH_MODULE is used to search for SDL2 and SDL2_image and configure their include paths and libraries.
• Notice that the Name value in /usr/lib/x86_64-linux-gnu/pkgconfig/SDL2_image.pc matches the third parameter to PKG_SEARCH_MODULE for this library.

Implementing these changes should resolve the linking issue and allow the program to use SDL2 and SDL_image successfully.

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