project(yak-kernel)

set(CMAKE_SYSROOT "/does-not-exist")

option(USE_LIMINE "Enable support for the limine boot protocol" ON)

add_compile_options(
        -ffreestanding
        -fno-lto
        -fno-pie
        -fno-pic
        -m64
        --target=x86_64-pc-none-eabi
        -mno-80387
        -mno-mmx
        -mno-sse
        -mno-sse2
        -mno-red-zone
        -mcmodel=kernel
)
add_link_options(
        -nostdlib
        -static
        -z max-page-size=0x1000
        -T ${CMAKE_CURRENT_SOURCE_DIR}/linker.lds
)

FetchContent_Declare(printf_library
        GIT_REPOSITORY https://github.com/eyalroz/printf.git
        GIT_TAG v6.1.0)
FetchContent_GetProperties(printf_library)
if (NOT printf_library_POPULATED)
    FetchContent_Populate(printf_library)
endif ()


if (NOT ${USE_LIMINE})
    message(FATAL_ERROR "At least one boot protocol is required")
endif ()

file(GLOB KERNEL_SOURCES src/rt/*.c src/ulibc/*.c)
file(GLOB PLATFORM_GENERIC_SOURCES src/platform/generic/*.c)

if (${USE_LIMINE})
    file(GLOB LIMINE_KERNEL_SOURCES src/rt/limine/*.c)
endif ()
if (NOT IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/src/platform/${CMAKE_SYSTEM_PROCESSOR})
    message(FATAL_ERROR "Unknown architecture ${CMAKE_CURRENT_SOURCE_DIR}/src/platform/${CMAKE_SYSTEM_PROCESSOR}")
endif ()

file(GLOB PLATFORM_SPECIFIC_SOURCES src/platform/x86_64/*.c)

set(KERNEL_SOURCE_FILES ${KERNEL_SOURCES} ${LIMINE_KERNEL_SOURCES} ${PLATFORM_GENERIC_SOURCES} ${PLATFORM_SPECIFIC_SOURCES})

add_executable(yak.elf ${KERNEL_SOURCE_FILES})
target_link_libraries(yak.elf PRIVATE /usr/lib/clang/15.0.7/lib/linux/libclang_rt.builtins-x86_64.a)
target_include_directories(yak.elf PRIVATE include ../limine/include ${printf_library_SOURCE_DIR}/src)# ${printf_library_SOURCE_DIR}/src)