cmake_minimum_required(VERSION "3.27")

project("kernel"
  DESCRIPTION "An educational OS kernel"
  HOMEPAGE_URL "https://gitlab.ost.ch/teachos/kernel"
  VERSION "0.0.1"
  LANGUAGES ASM C CXX
)

set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/Modules")

include("ElfTransformations")
include("GenerateBootableIso")

#[============================================================================[
# Global Build System Configuration
#]============================================================================]

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION YES)

set(CMAKE_CXX_STANDARD "20")
set(CMAKE_CXX_STANDARD_REQUIRED YES)
set(CMAKE_CXX_EXTENSIONS NO)

add_compile_options(
  "$<$<CXX_COMPILER_ID:GNU>:-Wall>"
  "$<$<CXX_COMPILER_ID:GNU>:-Wextra>"
  "$<$<CXX_COMPILER_ID:GNU>:-Werror>"
  "$<$<CXX_COMPILER_ID:GNU>:-pedantic-errors>"
)

#[============================================================================[
# Kernel Executable
#]============================================================================]

add_subdirectory("arch/${CMAKE_SYSTEM_PROCESSOR}")
add_subdirectory("kapi")
add_subdirectory("libs")

add_executable("kernel"
    "src/abort.cpp"
    "src/kstd.cpp"
    "src/main.cpp"
)

target_link_libraries("kernel" PRIVATE
    "os::arch"
    "os::kapi"
)

target_link_options("kernel" PRIVATE
    "-T${KERNEL_LINKER_SCRIPT}"
    "-no-pie"
    "-nostdlib"
)

set_property(TARGET "kernel"
    APPEND
    PROPERTY LINK_DEPENDS
    "${KERNEL_LINKER_SCRIPT}"
)

target_disassemble("kernel")
target_extract_debug_symbols("kernel")
target_strip("kernel")

target_generate_bootable_iso("kernel")