docs: expand CMake documentation + add minimal CMake project for reporting issues
Anonymous Maarten
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@ -1,6 +1,6 @@
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# CMake
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(www.cmake.org)
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[www.cmake.org](https://www.cmake.org/)
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The CMake build system is supported on the following platforms:
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@ -11,23 +11,24 @@ The CMake build system is supported on the following platforms:
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* macOS, iOS, and tvOS, with support for XCode
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* Android
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* Emscripten
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* RiscOS
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* FreeBSD
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* Haiku
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* Nintendo 3DS
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* Playstation 2
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* Playstation Vita
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* Nintendo 3DS
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* QNX 7.x/8.x
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* RiscOS
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## Building SDL
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Assuming the source for SDL is located at `~/sdl`.
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Assuming the source tree of SDL is located at `~/sdl`,
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this will configure and build SDL in the `~/build` directory:
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```sh
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cmake -S ~/sdl -B ~/build
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cmake --build ~/build
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```
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This will build SDL in the `~/build` directory.
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Installation can be done using:
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```sh
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cmake --install ~/build --prefix /usr/local # '--install' requires CMake 3.15, or newer
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```
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@ -43,23 +44,26 @@ SDL can be included in your project in 2 major ways:
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The following CMake script supports both, depending on the value of `MYGAME_VENDORED`.
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```cmake
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cmake_minimum_required(VERSION 3.0)
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cmake_minimum_required(VERSION 3.5)
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project(mygame)
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# Create an option to switch between a system sdl library and a vendored sdl library
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# Create an option to switch between a system sdl library and a vendored SDL library
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option(MYGAME_VENDORED "Use vendored libraries" OFF)
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if(MYGAME_VENDORED)
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add_subdirectory(vendored/sdl EXCLUDE_FROM_ALL)
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# This assumes you have added SDL as a submodule in vendored/SDL
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add_subdirectory(vendored/SDL EXCLUDE_FROM_ALL)
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else()
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# 1. Look for a SDL3 package, 2. look for the SDL3 component and 3. fail if none can be found
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find_package(SDL3 REQUIRED CONFIG REQUIRED COMPONENTS SDL3)
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# 1. Look for a SDL3 package,
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# 2. look for the SDL3-shared component, and
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# 3. fail if the shared component cannot be found.
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find_package(SDL3 REQUIRED CONFIG REQUIRED COMPONENTS SDL3-shared)
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endif()
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# Create your game executable target as usual
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add_executable(mygame WIN32 mygame.c)
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# Link to the actual SDL3 library. SDL3::SDL3 is the shared SDL library, SDL3::SDL3-static is the static SDL libarary.
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# Link to the actual SDL3 library.
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target_link_libraries(mygame PRIVATE SDL3::SDL3)
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```
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@ -80,7 +84,9 @@ The following components are available, to be used as an argument of `find_packa
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### Using a vendored SDL
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This only requires a copy of SDL in a subdirectory.
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This only requires a copy of SDL in a subdirectory + `add_subdirectory`.
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Alternatively, use [FetchContent](https://cmake.org/cmake/help/latest/module/FetchContent.html).
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Depending on the configuration, the same targets as a system SDL package are available.
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## CMake configuration options
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@ -97,6 +103,11 @@ To build it, run:
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cmake --build . --config Release
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```
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### Shared or static
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By default, only a shared SDL library is built and installed.
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The options `-DSDL_SHARED=` and `-DSDL_STATIC=` accept boolean values to change this.
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### Pass custom compile options to the compiler
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- Use [`CMAKE_<LANG>_FLAGS`](https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_FLAGS.html) to pass extra
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@ -185,3 +196,109 @@ To use, set the following CMake variables when running CMake's configuration sta
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```cmake
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cmake ~/sdl -DCMAKE_TOOLCHAIN_FILE=~/sdl/build-scripts/cmake-toolchain-qnx-aarch64le.cmake -DSDL_X11=0
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```
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## Help, it doesn't work!
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Below, a SDL3 CMake project can be found that builds 99.9% of time (assuming you have internet connectivity).
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When you have a problem with building or using SDL, please modify it until it reproduces your issue.
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```cmake
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cmake_minimum_required(VERSION 3.16)
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project(sdl_issue)
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# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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# !!!!!! !!!!!!
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# !!!!!! This CMake script is not using "CMake best practices". !!!!!!
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# !!!!!! Don't use it in your project. !!!!!!
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# !!!!!! !!!!!!
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# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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# 1. Try system SDL3 package first
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find_package(SDL3 QUIET)
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if(SDL3_FOUND)
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message(STATUS "Using SDL3 via find_package")
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endif()
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# 2. Try using a vendored SDL library
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if(NOT SDL3_FOUND AND EXISTS "${CMAKE_CURRENT_LIST_DIR}/SDL/CMakeLists.txt")
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add_subdirectory(SDL)
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message(STATUS "Using SDL3 via add_subdirectory")
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set(SDL3_FOUND TRUE)
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endif()
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# 3. Download SDL, and use that.
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if(NOT SDL3_FOUND)
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include(FetchContent)
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set(SDL_SHARED TRUE CACHE BOOL "Build a SDL shared library (if available)")
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set(SDL_STATIC TRUE CACHE BOOL "Build a SDL static library (if available)")
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FetchContent_Declare(
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SDL
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GIT_REPOSITORY https://github.com/libsdl-org/SDL.git
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GIT_TAG main # Replace this with a particular git tag or git hash
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GIT_SHALLOW TRUE
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GIT_PROGRESS TRUE
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)
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message(STATUS "Using SDL3 via FetchContent")
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FetchContent_MakeAvailable(SDL)
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set_property(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/_deps/sdl-src" PROPERTY EXCLUDE_FROM_ALL TRUE)
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endif()
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file(WRITE main.c [===========================================[
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/**
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* Modify this source such that it reproduces your problem.
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*/
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/* START of source modifications */
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#include <SDL3/SDL.h>
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int main(int argc, char *argv[]) {
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if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
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SDL_Log("SDL_Init failed (%s)", SDL_GetError());
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return 1;
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}
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SDL_Window *window = NULL;
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SDL_Renderer *renderer = NULL;
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if (SDL_CreateWindowAndRenderer(640, 480, 0, &window, &renderer) < 0) {
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SDL_Log("SDL_CreateWindowAndRenderer failed (%s)", SDL_GetError());
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SDL_Quit();
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return 1;
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}
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SDL_SetWindowTitle(window, "SDL issue");
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while (1) {
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int finished = 0;
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SDL_Event event;
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while (SDL_PollEvent(&event)) {
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if (event.type == SDL_EVENT_QUIT) {
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finished = 1;
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break;
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}
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}
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if (finished) {
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break;
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}
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SDL_SetRenderDrawColor(renderer, 80, 80, 80, SDL_ALPHA_OPAQUE);
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SDL_RenderClear(renderer);
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SDL_RenderPresent(renderer);
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}
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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}
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/* END of source modifications */
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]===========================================])
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add_executable(sdl_issue main.c)
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target_link_libraries(sdl_issue PRIVATE SDL3::SDL3)
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# target_link_libraries(sdl_issue PRIVATE SDL3::SDL3-shared)
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# target_link_libraries(sdl_issue PRIVATE SDL3::SDL3-static)
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```
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