# Copyright (C) 2021,2022 fef <owo@fef.moe>.  All rights reserved.

set(TOOLCHAIN_PATH "/usr/bin" CACHE STRING "Toolchain directory")

set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_CROSSCOMPILING 1)
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
if (CFG_X86_64)
    set(CMAKE_SYSTEM_PROCESSOR x86-64)
    set(_toolchain_common_flags "-m64 -march=${M_ARCH}")
    set(_toolchain_triple x86_64-pc-none-elf)
    set(_toolchain_bits 64)
else()
    set(CMAKE_SYSTEM_PROCESSOR i686)
    set(_toolchain_common_flags "-m32 -march=i686")
    set(_toolchain_triple i686-pc-none-elf)
    set(_toolchain_bits 32)
endif()

set(CMAKE_AR            ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}ar${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_ASM_COMPILER  ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}clang${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_C_COMPILER    ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}clang${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_LINKER        ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}ld.lld${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_OBJCOPY       ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}objcopy${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")
set(CMAKE_RANLIB        ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}ranlib${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")
set(CMAKE_SZE           ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}szr${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")
set(CMAKE_STRIP         ${TOOLCHAIN_PATH}/${CMAKE_EXECUTABLE_PREFIX}strip${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")

# XXX ktrace_print() currently relies on -fno-omit-frame-pointer
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_toolchain_common_flags} -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -fno-omit-frame-pointer")
set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${_toolchain_common_flags}")
set(CMAKE_C_COMPILER_TARGET ${_toolchain_triple})
set(CMAKE_ASM_COMPILER_TARGET ${_toolchain_triple})

set(CMAKE_EXE_LINKER_FLAGS_INIT "-fuse-ld=lld")
set(CMAKE_MODULE_LINKER_FLAGS_INIT "-fuse-ld=lld")
set(CMAKE_SHARED_LINKER_FLAGS_INIT "-fuse-ld=lld")

configure_file(
    "${CMAKE_CURRENT_LIST_DIR}/kernel_config.ld.in"
    "${CMAKE_BINARY_DIR}/config/kernel_config.ld"
)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -T${CMAKE_BINARY_DIR}/config/kernel_config.ld -T${CMAKE_CURRENT_LIST_DIR}/kernel${_toolchain_bits}.ld")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)