cmake_minimum_required(VERSION 3.10)
project(MyShittyKernel LANGUAGES ASM C)

if(NOT LLVM_BIN)
    execute_process(COMMAND brew --prefix llvm OUTPUT_VARIABLE LLVM_PREFIX OUTPUT_STRIP_TRAILING_WHITESPACE)
    set(LLVM_BIN "${LLVM_PREFIX}/bin")
endif()

set(CMAKE_C_COMPILER "${LLVM_BIN}/clang")
set(CMAKE_ASM_COMPILER "${LLVM_BIN}/clang")
set(LLVM_OBJCOPY "${LLVM_BIN}/llvm-objcopy")

set(TARGET_TRIPLE aarch64-none-elf)
add_compile_options(--target=${TARGET_TRIPLE} -ffreestanding -nostdlib -O0 -g)

set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
add_link_options(
    --target=${TARGET_TRIPLE}
    -fuse-ld=lld
    -nostdlib
    -static
    -Wl,-T,${LINKER_SCRIPT}
)

add_executable(kernel.elf Source/entry.S)

add_custom_command(TARGET kernel.elf POST_BUILD
    COMMAND ${LLVM_OBJCOPY} -O binary kernel.elf kernel.bin
    COMMENT "kernel.elf -> kernel.bin"
)