SDL2-CMakeLists.txt

cmake_minimum_required(VERSION 3.25)
project(wallclock)

option(LV_USE_DRAW_SDL "Use SDL draw unit" OFF)
option(LV_USE_LIBPNG "Use libpng to decode PNG" OFF)
option(LV_USE_LIBJPEG_TURBO "Use libjpeg turbo to decode JPEG" OFF)
option(LV_USE_FFMPEG "Use libffmpeg to display video using lv_ffmpeg" OFF)
option(LV_USE_FREETYPE "Use freetype lib" OFF)

set(CMAKE_C_STANDARD 99)#C99 # lvgl officially support C99 and above
set(CMAKE_CXX_STANDARD 17)#C17
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(LVGL_TOP, managed_components/lvgl__lvgl)
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)

find_package(SDL2 REQUIRED SDL2)

add_compile_definitions($<$<BOOL:${LV_USE_DRAW_SDL}>:LV_USE_DRAW_SDL=1>)
add_compile_definitions($<$<BOOL:${LV_USE_LIBPNG}>:LV_USE_LIBPNG=1>)
add_compile_definitions($<$<BOOL:${LV_USE_LIBJPEG_TURBO}>:LV_USE_LIBJPEG_TURBO=1>)
add_compile_definitions($<$<BOOL:${LV_USE_FFMPEG}>:LV_USE_FFMPEG=1>)

add_subdirectory(${LVGL_TOP})
target_include_directories(lvgl PUBLIC ${PROJECT_SOURCE_DIR} ${SDL2_INCLUDE_DIRS})

add_executable(sdl-main sdl-main.c)

target_compile_definitions(sdl-main PRIVATE LV_CONF_INCLUDE_SIMPLE)
target_link_libraries(sdl-main lvgl ${SDL2_LIBRARIES} m pthread)
add_custom_target (run COMMAND ${EXECUTABLE_OUTPUT_PATH}/sdl-main DEPENDS sdl-main)

if(LV_USE_DRAW_SDL)
    set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
    # Need to install libsdl2-image-dev
    # `sudo apt install libsdl2-image-dev`
    # `brew install sdl2_image`
    find_package(SDL2_image REQUIRED)
    target_include_directories(lvgl PUBLIC ${SDL2_IMAGE_INCLUDE_DIRS})
    target_link_libraries(sdl-main ${SDL2_IMAGE_LIBRARIES})
endif(LV_USE_DRAW_SDL)

if(LV_USE_LIBPNG)
    find_package(PNG REQUIRED)
    target_include_directories(lvgl PUBLIC ${PNG_INCLUDE_DIR})
    target_link_libraries(sdl-main ${PNG_LIBRARY})
endif(LV_USE_LIBPNG)

if(LV_USE_LIBJPEG_TURBO)
    # Need to install libjpeg-turbo8-dev
    # `sudo apt install libjpeg-turbo8-dev`
    # `brew install libjpeg-turbo`
    find_package(JPEG REQUIRED)
    target_include_directories(lvgl PUBLIC ${JPEG_INCLUDE_DIRS})
    target_link_libraries(sdl-main ${JPEG_LIBRARIES})
endif(LV_USE_LIBJPEG_TURBO)

if(LV_USE_FFMPEG)
    target_link_libraries(sdl-main avformat avcodec avutil swscale)
endif(LV_USE_FFMPEG)

if(LV_USE_FREETYPE)
    find_package(Freetype REQUIRED)
    target_link_libraries(sdl-main ${FREETYPE_LIBRARIES})
    target_include_directories(lvgl PUBLIC ${FREETYPE_INCLUDE_DIRS})
endif(LV_USE_FREETYPE)

if(CMAKE_BUILD_TYPE STREQUAL "Debug")
    target_compile_options(lvgl PRIVATE
        -pedantic-errors
        -Wall
        -Wclobbered
        -Wdeprecated
        -Wdouble-promotion
        -Wempty-body
        -Wextra
        -Wformat-security
        -Wmaybe-uninitialized
        # -Wmissing-prototypes
        -Wpointer-arith
        -Wmultichar
        -Wno-pedantic # ignored for now, we convert functions to pointers for propertis table.
        -Wreturn-type
        -Wshadow
        -Wshift-negative-value
        -Wsizeof-pointer-memaccess
        -Wtype-limits
        -Wundef
        -Wuninitialized
        -Wunreachable-code
        -Wfloat-conversion
        -Wstrict-aliasing
    )

    target_compile_options(sdl-main PRIVATE -fsanitize=address,leak,undefined)
    target_link_options(sdl-main PRIVATE -fsanitize=address,leak,undefined)
endif()