Reputation: 2288
I'm currently learning CMake and I'm trying to create my first test project. I'm able to get a simple project up and running in visual studio via CMake. However, I'm having trouble trying to add a library. I've read some guides and things but I keep getting errors. Basically, I'm trying to link SDL libraries (a game programming library) in my sample project. I've placed these libraries in a top level, 'ThirdParty' folder. Here is what my CmakeLists.txt file looks like in my top level directory:
cmake_minimum_required(VERSION 2.8.11)
project(Hello)
#Find necessary header files
find_path(SDL_INCLUDE_DIR SDL.h HINTS ${CMAKE_SOURCE_DIR}/ThirdParty/SDL2/include/)
#Find necessary library files
find_library(SDL_LIB_DIR SDL2 HINTS ${CMAKE_SOURCE_DIR}/ThirdParty/SDL2/lib/x86)
find_library(SDLMAIN_LIB_DIR SDLmain HINTS ${CMAKE_SOURCE_DIR}/ThirdParty/SDL2/lib/x86)
#Add/Link files to project
include_directories(${SDL_INCLUDE_DIR})
target_link_libraries(Test PUBLIC ${SDL_LIB_DIR})
target_link_libraries(Test PUBLIC ${SDLMAIN_LIB_DIR})
add_executable(Test "${CMAKE_SOURCE_DIR}/Source/Main.cpp")
I'm not 100 percent sure of the HINTS parameter, but I saw it used on another thread. Anyway, here's the error I keep getting:
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
SDLMAIN_LIB_DIR
linked by target "Test" in directory C:/Users/Jason/Desktop/Test
What am I doing wrong and how do I properly link libraries in CMake?
Upvotes: 0
Views: 966
Reputation: 26346
find_library
or find_package
, and then cmake will set some variables that you can use to link to/use the library.I'm not familiar with SDL, but by googling a little bit about it, I would say this is how it should look like:
find_file(SDL2_INCLUDE_DIR NAME SDL.h HINTS SDL2)
find_library(SDL2_LIBRARY NAME SDL2)
add_executable(MyExec main.cpp)
target_include_directories(MyExec ${SDL2_INCLUDE_DIR})
target_link_libraries(MyExec ${SDL2_LIBRARY})
That find_library
will set the variables SDL2_INCLUDE_DIR
and SDL2_LIBRARY
, which you can use to link to SDL and add its includes to your project.
Upvotes: 2