project (ClickHouse)
cmake_minimum_required (VERSION 3.9)

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

set(ENABLE_IPO OFF CACHE STRING "Enable inter-procedural optimization (aka LTO)")

if (ENABLE_IPO)
include(CheckIPOSupported)
check_ipo_supported(RESULT IPO_SUPPORTED OUTPUT IPO_NOT_SUPPORTED)
if(IPO_SUPPORTED)
    message(STATUS "IPO/LTO is supported, enabling")
    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
else()
    message(STATUS "IPO/LTO is not supported: <${IPO_NOT_SUPPORTED}>")
endif()
else()
    message(STATUS "IPO/LTO not enabled.")
endif()

if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    # Require at least gcc 7
    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7 AND NOT CMAKE_VERSION VERSION_LESS 2.8.9)
        message (FATAL_ERROR "GCC version must be at least 7. For example, if GCC 7 is available under gcc-7, g++-7 names, do the following: export CC=gcc-7 CXX=g++-7; rm -rf CMakeCache.txt CMakeFiles; and re run cmake or ./release.")
    endif ()
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    # Require at least clang 5
    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5)
        message (FATAL_ERROR "Clang version must be at least 5.")
    endif ()
else ()
    message (WARNING "You are using an unsupported compiler. Compilation has only been tested with Clang 5+ and GCC 7+.")
endif ()

# Interferes when bulding Debian package from git repository.
## Check that submodules are present only if source was downloaded with git
#if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.git" AND NOT EXISTS "${ClickHouse_SOURCE_DIR}/contrib/boost/boost")
#    message (FATAL_ERROR "Submodules are not initialized. Run\n\tgit submodule update --init --recursive")
#endif ()

# Write compile_commands.json
set(CMAKE_EXPORT_COMPILE_COMMANDS 1)

set(PARALLEL_COMPILE_JOBS "" CACHE STRING "Define the maximum number of concurrent compilation jobs")
if (PARALLEL_COMPILE_JOBS)
    set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool="${PARALLEL_COMPILE_JOBS}")
    set(CMAKE_JOB_POOL_COMPILE compile_job_pool)
endif ()

set(PARALLEL_LINK_JOBS "" CACHE STRING "Define the maximum number of concurrent link jobs")
if (LLVM_PARALLEL_LINK_JOBS)
    set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${PARALLEL_LINK_JOBS})
    set(CMAKE_JOB_POOL_LINK link_job_pool)
endif ()

include (cmake/find_ccache.cmake)

if (NOT CMAKE_BUILD_TYPE OR CMAKE_BUILD_TYPE STREQUAL "None")
    message (STATUS "CMAKE_BUILD_TYPE is not set, set to default = RELWITHDEBINFO")
    set (CMAKE_BUILD_TYPE "RELWITHDEBINFO")
endif ()
string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)
message (STATUS "CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")

set (CMAKE_CONFIGURATION_TYPES "RelWithDebInfo;Debug;Release;MinSizeRel" CACHE STRING "" FORCE)

option (USE_STATIC_LIBRARIES "Set to FALSE to use shared libraries" ON)
option (MAKE_STATIC_LIBRARIES "Set to FALSE to make shared libraries" ${USE_STATIC_LIBRARIES})
if (NOT MAKE_STATIC_LIBRARIES)
    option (SPLIT_SHARED_LIBRARIES "DEV ONLY. Keep all internal libs as separate .so for faster linking" OFF)
    option (CLICKHOUSE_SPLIT_BINARY "Make several binaries instead one bundled (clickhouse-server, clickhouse-client, ... )" OFF)
endif ()

if (SPLIT_SHARED_LIBRARIES)
    set (LINK_MODE SHARED)
endif ()

if (USE_STATIC_LIBRARIES)
    list(REVERSE CMAKE_FIND_LIBRARY_SUFFIXES)
endif ()

include (cmake/sanitize.cmake)

include (cmake/arch.cmake)

if (CMAKE_GENERATOR STREQUAL "Ninja")
    # Turn on colored output. https://github.com/ninja-build/ninja/wiki/FAQ
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-color=always")
    set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdiagnostics-color=always")
endif ()

if (NOT MSVC)
    set (COMMON_WARNING_FLAGS "${COMMON_WARNING_FLAGS} -Wall")    # -Werror is also added inside directories with our own code.
endif ()

if (COMPILER_GCC OR COMPILER_CLANG)
    set (CXX_WARNING_FLAGS "${CXX_WARNING_FLAGS} -Wnon-virtual-dtor")
endif ()

if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    # clang: warning: argument unused during compilation: '-stdlib=libc++'
    # clang: warning: argument unused during compilation: '-specs=/usr/share/dpkg/no-pie-compile.specs' [-Wunused-command-line-argument]
    set (COMMON_WARNING_FLAGS "${COMMON_WARNING_FLAGS} -Wno-unused-command-line-argument")
endif ()

option (TEST_COVERAGE "Enables flags for test coverage" OFF)
option (ENABLE_TESTS "Enables tests" ON)

if (CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64")
    option (USE_INTERNAL_MEMCPY "Use internal implementation of 'memcpy' function instead of provided by libc. Only for x86_64." ON)

    if (OS_LINUX)
        option (GLIBC_COMPATIBILITY "Set to TRUE to enable compatibility with older glibc libraries. Only for x86_64, Linux. Implies USE_INTERNAL_MEMCPY." ON)
    endif()
endif ()

if (GLIBC_COMPATIBILITY)
    set (USE_INTERNAL_MEMCPY ON)
endif ()

set (COMPILER_FLAGS "${COMPILER_FLAGS}")

string(REGEX MATCH "-?[0-9]+(.[0-9]+)?$" COMPILER_POSTFIX ${CMAKE_CXX_COMPILER})

find_program (LLD_PATH NAMES "lld${COMPILER_POSTFIX}" "lld")
find_program (GOLD_PATH NAMES "gold")

if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND LLD_PATH AND NOT LINKER_NAME)
    set (LINKER_NAME "lld")
elseif (GOLD_PATH)
    set (LINKER_NAME "gold")
endif ()

if (LINKER_NAME)
    message(STATUS "Using linker: ${LINKER_NAME} (selected from: LLD_PATH=${LLD_PATH}; GOLD_PATH=${GOLD_PATH}; COMPILER_POSTFIX=${COMPILER_POSTFIX})")
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=${LINKER_NAME}")
endif ()

option (PIPE "-pipe compiler option [less /tmp usage, more ram usage]" ON)
if (PIPE)
    set (COMPILER_FLAGS                  "${COMPILER_FLAGS} -pipe")
endif ()

if(NOT COMPILER_CLANG) # clang: error: the clang compiler does not support '-march=native'
    option(ARCH_NATIVE "Enable -march=native compiler flag" ${ARCH_ARM})
endif()

if (ARCH_NATIVE)
    set (COMPILER_FLAGS                  "${COMPILER_FLAGS} -march=native")
endif ()

# Special options for better optimized code with clang
#if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
#    set (CMAKE_CXX_FLAGS_RELWITHDEBINFO  "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -Wno-unused-command-line-argument -mllvm -inline-threshold=10000")
#endif ()

if (CMAKE_VERSION VERSION_LESS "3.8.0")
    if (NOT MSVC)
        set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1z")
    endif ()
else ()
    set (CMAKE_CXX_STANDARD 17)
    set (CMAKE_CXX_EXTENSIONS 0) # https://cmake.org/cmake/help/latest/prop_tgt/CXX_EXTENSIONS.html#prop_tgt:CXX_EXTENSIONS
    set (CMAKE_CXX_STANDARD_REQUIRED ON)
    set (CXX_FLAGS_INTERNAL_COMPILER "-std=c++1z")
endif ()

set (CMAKE_BUILD_COLOR_MAKEFILE          ON)
set (CMAKE_CXX_FLAGS                     "${CMAKE_CXX_FLAGS} ${COMPILER_FLAGS} ${PLATFORM_EXTRA_CXX_FLAG} -fno-omit-frame-pointer ${COMMON_WARNING_FLAGS} ${CXX_WARNING_FLAGS}")
#set (CMAKE_CXX_FLAGS_RELEASE             "${CMAKE_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS_ADD}")
set (CMAKE_CXX_FLAGS_RELWITHDEBINFO      "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -O3 ${CMAKE_CXX_FLAGS_ADD}")
set (CMAKE_CXX_FLAGS_DEBUG               "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g3 -ggdb3 -fno-inline ${CMAKE_CXX_FLAGS_ADD}")

set (CMAKE_C_FLAGS                       "${CMAKE_C_FLAGS} ${COMPILER_FLAGS} -fno-omit-frame-pointer ${COMMON_WARNING_FLAGS} ${CMAKE_C_FLAGS_ADD}")
#set (CMAKE_C_FLAGS_RELEASE               "${CMAKE_C_FLAGS_RELEASE} ${CMAKE_C_FLAGS_ADD}")
set (CMAKE_C_FLAGS_RELWITHDEBINFO        "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O3 ${CMAKE_C_FLAGS_ADD}")
set (CMAKE_C_FLAGS_DEBUG                 "${CMAKE_C_FLAGS_DEBUG} -O0 -g3 -ggdb3 -fno-inline ${CMAKE_C_FLAGS_ADD}")

set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package (Threads)

include (cmake/test_compiler.cmake)

if (OS_LINUX AND COMPILER_CLANG)
    set (CMAKE_EXE_LINKER_FLAGS          "${CMAKE_EXE_LINKER_FLAGS}")

    option (USE_LIBCXX "Use libc++ and libc++abi instead of libstdc++ (only make sense on Linux with Clang)" ${HAVE_LIBCXX})
    set (LIBCXX_PATH "" CACHE STRING "Use custom path for libc++. It should be used for MSan.")

    if (USE_LIBCXX)
        set (CMAKE_CXX_FLAGS             "${CMAKE_CXX_FLAGS} -stdlib=libc++") # Ok for clang6, for older can cause 'not used option' warning
        set (CMAKE_CXX_FLAGS_DEBUG       "${CMAKE_CXX_FLAGS_DEBUG} -D_LIBCPP_DEBUG=0") # More checks in debug build.
        if (MAKE_STATIC_LIBRARIES)
            execute_process (COMMAND ${CMAKE_CXX_COMPILER} --print-file-name=libclang_rt.builtins-${CMAKE_SYSTEM_PROCESSOR}.a OUTPUT_VARIABLE BUILTINS_LIB_PATH OUTPUT_STRIP_TRAILING_WHITESPACE)
            link_libraries (-nodefaultlibs -Wl,-Bstatic -stdlib=libc++ c++ c++abi gcc_eh ${BUILTINS_LIB_PATH} rt -Wl,-Bdynamic dl pthread m c)
        else ()
            link_libraries (-stdlib=libc++ c++ c++abi)
        endif ()

        if (LIBCXX_PATH)
#            include_directories (SYSTEM BEFORE "${LIBCXX_PATH}/include" "${LIBCXX_PATH}/include/c++/v1")
            link_directories ("${LIBCXX_PATH}/lib")
        endif ()
    endif ()
endif ()

if (USE_LIBCXX)
    set (STATIC_STDLIB_FLAGS "")
else ()
    set (STATIC_STDLIB_FLAGS "-static-libgcc -static-libstdc++")
endif ()

if (MAKE_STATIC_LIBRARIES AND NOT APPLE AND NOT (COMPILER_CLANG AND OS_FREEBSD))
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${STATIC_STDLIB_FLAGS}")

    # Along with executables, we also build example of shared library for "library dictionary source"; and it also should be self-contained.
    set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${STATIC_STDLIB_FLAGS}")
endif ()

if (USE_STATIC_LIBRARIES AND HAVE_NO_PIE)
    set (CMAKE_CXX_FLAGS                 "${CMAKE_CXX_FLAGS} ${FLAG_NO_PIE}")
    set (CMAKE_C_FLAGS                   "${CMAKE_C_FLAGS} ${FLAG_NO_PIE}")
endif ()

if (NOT MAKE_STATIC_LIBRARIES)
    set(CMAKE_POSITION_INDEPENDENT_CODE ON)
endif ()

# Using "include-what-you-use" tool.
option (USE_INCLUDE_WHAT_YOU_USE "Use 'include-what-you-use' tool" OFF)
if (USE_INCLUDE_WHAT_YOU_USE)
    find_program(IWYU_PATH NAMES include-what-you-use iwyu)
    if (NOT IWYU_PATH)
        message(FATAL_ERROR "Could not find the program include-what-you-use")
    endif()
    if (${CMAKE_VERSION} VERSION_LESS "3.3.0")
        message(FATAL_ERROR "include-what-you-use requires CMake version at least 3.3.")
    endif()
endif ()

# Flags for test coverage
if (TEST_COVERAGE)
    set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fprofile-arcs -ftest-coverage -DIS_DEBUG")
endif (TEST_COVERAGE)

if (ENABLE_TESTS)
    message (STATUS "Tests are enabled")
    enable_testing()
endif ()

# when installing to /usr - place configs to /etc but for /usr/local place to /usr/local/etc
if (CMAKE_INSTALL_PREFIX STREQUAL "/usr")
    set (CLICKHOUSE_ETC_DIR "/etc")
else ()
    set (CLICKHOUSE_ETC_DIR "${CMAKE_INSTALL_PREFIX}/etc")
endif ()

option (UNBUNDLED "Try find all libraries in system. We recommend to avoid this mode for production builds, because we cannot guarantee exact versions and variants of libraries your system has installed. This mode exists for enthusiastic developers who search for trouble. Also it is useful for maintainers of OS packages." OFF)
if (UNBUNDLED)
    set(NOT_UNBUNDLED 0)
else ()
    set(NOT_UNBUNDLED 1)
endif ()
# Using system libs can cause lot of warnings in includes.
if (UNBUNDLED OR NOT (OS_LINUX OR APPLE) OR ARCH_32)
    option (NO_WERROR "Disable -Werror compiler option" ON)
endif ()

message (STATUS "Building for: ${CMAKE_SYSTEM} ${CMAKE_SYSTEM_PROCESSOR} ${CMAKE_LIBRARY_ARCHITECTURE} ; USE_STATIC_LIBRARIES=${USE_STATIC_LIBRARIES} MAKE_STATIC_LIBRARIES=${MAKE_STATIC_LIBRARIES} UNBUNDLED=${UNBUNDLED} CCACHE=${CCACHE_FOUND} ${CCACHE_VERSION}")

include(GNUInstallDirs)

include (cmake/find_ssl.cmake)
include (cmake/lib_name.cmake)
include (cmake/find_icu.cmake)
include (cmake/find_boost.cmake)
include (cmake/find_zlib.cmake)
include (cmake/find_zstd.cmake)
include (cmake/find_ltdl.cmake) # for odbc
include (cmake/find_termcap.cmake)
include (cmake/find_odbc.cmake)
# openssl, zlib, odbc before poco
include (cmake/find_poco.cmake)
include (cmake/find_lz4.cmake)
include (cmake/find_sparsehash.cmake)
include (cmake/find_rt.cmake)
include (cmake/find_execinfo.cmake)
include (cmake/find_readline_edit.cmake)
include (cmake/find_re2.cmake)
include (cmake/find_rdkafka.cmake)
include (cmake/find_capnp.cmake)
include (cmake/find_llvm.cmake)
include (cmake/find_cpuinfo.cmake)
include (cmake/find_libgsasl.cmake)
include (cmake/find_libxml2.cmake)
include (cmake/find_hdfs3.cmake)
include (cmake/find_consistent-hashing.cmake)
if (ENABLE_TESTS)
    include (cmake/find_gtest.cmake)
endif ()

include (cmake/find_contrib_lib.cmake)
find_contrib_lib(cityhash)
find_contrib_lib(farmhash)
find_contrib_lib(metrohash)
find_contrib_lib(btrie)
find_contrib_lib(double-conversion)

# Need to process before "contrib" dir:
include (libs/libcommon/cmake/find_gperftools.cmake)
include (libs/libcommon/cmake/find_jemalloc.cmake)
include (libs/libcommon/cmake/find_cctz.cmake)
include (libs/libmysqlxx/cmake/find_mysqlclient.cmake)

include (cmake/print_flags.cmake)

add_subdirectory (contrib)
add_subdirectory (libs)
add_subdirectory (utils)
add_subdirectory (dbms)

include (cmake/print_include_directories.cmake)