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General / CMake in SFML 2.5

« on: May 16, 2018, 04:59:53 am »

Hi SFML team and forum readers,

I'm trying to use the new SFML CMake files with minimal success. I have good knowledge of C++, but only working knowledge of CMake. I have a few goals I'm trying to accomplish:

1. Embed SFML in my project (gets compiled as part of project; no separate step)
2. Include SFML statically
3. Expose SFML to other packages (should be a result of 1)

I was able to get the default SFML project building so long as I don't change anything.

However, I want to include SFML in my project, and my current workflow is to call CMake twice - once for SFML, and once for my project. I would like to be able to set up my project such that SFML appears as part of the resultant solution/etc.

My project is set up as follows:

/cmake
|    /modules
|    |    Findimgui.cmake
|    |    Findimgui-sfml.cmake
|    CMakeLists.txt (Main project CMake file)
/intermediate
|    /SFML
|    SFMLConfig.cmake
|    SFMLConfigDependencies.cmake
|    ... etc
/third-party
|    /SFML
|    < basically contents of the SFML GitHub repo; some files/folders get deleted >
/my-project
|     ...

I have a Python script to run CMake, the relevant lines are as follows:

run("cmake -A x64 -T host=x64 -DBUILD_SHARED_LIBS=OFF ../../third-party/SFML/", cwd='intermediate/SFML/')
run("cmake -A x64 -T host=x64 -DBUILD_SHARED_LIBS=OFF ../cmake/", cwd='intermediate/')

My main CMakeLists.txt:

cmake_minimum_required(VERSION 3.1)

project(my_proj)

set(my_proj_VERSION_MAJOR 0)
set(my_proj_VERSION_MINOR 1)

set(EXECUTABLE_NAME "my_proj")
set(CMAKE_EXPORT_COMPILE_COMMANDS TRUE)

# Custom packages
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/modules/")
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/../third-party/SFML/cmake/Modules")

# SFML
#set(SFML_STATIC_LIBRARIES TRUE) # Can't compile static yet
set(SFML_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../intermediate/SFML/")
set(SFML_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/../third-party/SFML/")
#set(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/../third-party/SFML/cmake/Modules")
#set(SFML_ROOT ${SFML_ROOT} "${CMAKE_CURRENT_SOURCE_DIR}/../third-party/SFML/cmake/Modules")
#message(STATUS "CMAKE_LIBRARY_PATH: ${CMAKE_LIBRARY_PATH}")
find_package(SFML 2.5 COMPONENTS graphics audio network REQUIRED)

# Imgui
find_package(imgui)
include_directories(${IMGUI_INCLUDE_DIRS})

find_package(imgui-sfml)
include_directories(${IMGUI_SFML_INCLUDE_DIRS})

add_executable(my_proj ../main.cpp)

target_link_libraries(my_proj
    sfml-graphics
    sfml-audio
    sfml-network
    imgui
    imgui-sfml
    )

add_dependencies(my_proj
    imgui
    imgui-sfml
)

If I compile SFML as a shared library, I can get pretty close - but my_proj and imgui-sfml are trying to use .lib files instead of .dll files, so I get linker errors.

Contents of Findimgui-sfml.cmake:

cmake_minimum_required(VERSION 3.1)

project(imgui-sfml)

file(GLOB_RECURSE IMGUI_SFML_SRC
    "${CMAKE_CURRENT_SOURCE_DIR}/../third-party/imgui-sfml/*.cpp"
)

find_package(SFML 2.5 COMPONENTS graphics REQUIRED)

set(IMGUI_SFML_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/../third-party/imgui-sfml/")

add_library(imgui-sfml STATIC
    ${IMGUI_SFML_SRC}
)

target_link_libraries(imgui-sfml
    sfml-graphics
)

If I try to compile SFML statically, I get errors about missing packages:

-- Selecting Windows SDK version 10.0.17134.0 to target Windows 10.0.16299.
CMake Error at D:/code/my_proj/intermediate/SFML/SFMLConfig.cmake:139 (message):
  SFML found but some of its dependencies are missing ( FreeType OpenAL Ogg
  Vorbis VorbisFile VorbisEnc FLAC)
Call Stack (most recent call first):
  CMakeLists.txt:28 (find_package)


CMake Error at CMakeLists.txt:28 (find_package):
  Found package configuration file:

    D:/code/my_proj/cmake/../intermediate/SFML/SFMLConfig.cmake

  but it set SFML_FOUND to FALSE so package "SFML" is considered to be NOT
  FOUND.


-- Configuring incomplete, errors occurred!

I would appreciate any help/suggestions with this.

Thanks for your time, and please let me know if more information is required.

Thanks!