project(linux C ASM)
cmake_minimum_required(VERSION 3.2)

find_package(BISON)

set(LIBV "6.6.0")
set(Upstream_VERSION 6.6.0)

if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86_64" OR "x86")
    set(linuxarch x86)
endif()

add_definitions(
    -DKERNELVERSION=Upstream_VERSION
    -DARCH=x86_64
)

if ("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
    add_definitions(-DLLVM=1)
    add_definitions(-DCC=clang)
    add_definitions(-D AS_IS_LLVM=TRUE)
    list(APPEND LINUXCMDOPTS LLVM=1)
    message(STATUS "Using compiler: ${CMAKE_C_COMPILER_ID}")
    add_compile_options(
        "-fintegrated-as"
        "-Werror=unknown-warning-option"
        "-Werror=ignored-optimization-argument"
        "-Werror=option-ignored"
        "-Werror=unused-command-line-argument"
    )
elseif("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
    message(STATUS "Using compiler: ${CMAKE_C_COMPILER_ID}")
    add_definitions(-DGCC)
    add_definitions(-DCC=gcc)
else()
    message(FATAL_ERROR "Your Compiler: ${CMAKE_C_COMPILER_ID} aren't supported")
endif()

list(APPEND LINUXCMDOPTS
    "ASM=${CMAKE_ASM_COMPILER}"
    "CC=${CMAKE_C_COMPILER}"
    "LD=${CMAKE_LINKER}"
    "srctree=${CMAKE_SOURCE_DIR}"
    "SRCARCH=${linuxarch}"
    "ARCH=${CMAKE_SYSTEM_PROCESSOR}"
)

include_directories(
    ${CMAKE_BINARY_DIR}
    ${CMAKE_SOURCE_DIR}
)

if(BISON_FOUND)
    find_program(bison
        flex
    )

    find_program(yacc
        yacc
    )

    set(menuconfigsrc
        scripts/kconfig/mconf.c
        scripts/kconfig/lxdialog/checklist.c
        scripts/kconfig/lxdialog/inputbox.c
        scripts/kconfig/lxdialog/menubox.c
        scripts/kconfig/lxdialog/textbox.c
        scripts/kconfig/lxdialog/util.c
        scripts/kconfig/lxdialog/yesno.c
        scripts/kconfig/confdata.c
        scripts/kconfig/expr.c
        scripts/kconfig/menu.c
        scripts/kconfig/preprocess.c
        scripts/kconfig/symbol.c
        scripts/kconfig/util.c
        scripts/kconfig/mconf.c
    )

    file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig)

    add_custom_command(
        OUTPUT
            ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig/lexer.c
            ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig/parser.tab.h
        COMMAND
            flex -o lexer.c -d "${CMAKE_SOURCE_DIR}/scripts/kconfig/lexer.l"
        COMMAND
            yacc -o parser.tab.h "${CMAKE_SOURCE_DIR}/scripts/kconfig/parser.y"
        WORKING_DIRECTORY
            ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig
        DEPENDS
            ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig
    )

    add_custom_target(menuconfig
        DEPENDS
            ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig/lexer.c
            ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig/parser.tab.h
        WORKING_DIRECTORY
            ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig
    )

    add_executable(menuexe EXCLUDE_FROM_ALL
        ${menuconfigsrc}
        #generated by command flex
        ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig/lexer.c
        #generated by command yacc
        ${CMAKE_CURRENT_BINARY_DIR}/scripts/kconfig/parser.tab.h
    )

    target_include_directories(menuexe
        PRIVATE
        ${CMAKE_SOURCE_DIR}/scripts/kconfig
    )

    target_compile_definitions(menuexe
        PRIVATE
        -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600
    )

    target_compile_definitions(menuexe
        PRIVATE
        -DYYDEBUG=1
    )

    target_link_libraries(menuexe
        ncursesw
        tinfo
    )

    add_dependencies(menuconfig menuexe)

    list(JOIN LINUXCMDOPTS ";" MENUCMD)

    add_custom_command(
        TARGET menuconfig POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy
                ${CMAKE_CURRENT_SOURCE_DIR}/Kconfig
                ${CMAKE_CURRENT_BINARY_DIR}/Kconfig
    )

    add_custom_command(
        TARGET
            menuconfig
        COMMAND
           ${MENUCMD} $<TARGET_FILE:menuexe> "Kconfig"
        DEPENDS
            menuexe
        WORKING_DIRECTORY
            ${CMAKE_BINARY_DIR}
        USES_TERMINAL
    )



endif(BISON_FOUND)