CMakeLists.txt

cmake_minimum_required(VERSION 3.20)

project(ClickHouse LANGUAGES C CXX ASM)

# If turned off: e.g. when ENABLE_FOO is ON, but FOO tool was not found, the CMake will continue.
option(FAIL_ON_UNSUPPORTED_OPTIONS_COMBINATION
   "Stop/Fail CMake configuration if some ENABLE_XXX option is defined (either ON or OFF)
   but is not possible to satisfy" ON)

if(FAIL_ON_UNSUPPORTED_OPTIONS_COMBINATION)
    set(RECONFIGURE_MESSAGE_LEVEL FATAL_ERROR)
else()
    set(RECONFIGURE_MESSAGE_LEVEL WARNING)
endif()

include (cmake/arch.cmake)
include (cmake/target.cmake)
include (cmake/tools.cmake)
include (cmake/ccache.cmake)
include (cmake/clang_tidy.cmake)
include (cmake/git.cmake)

# Ignore export() since we don't use it,
# but it gets broken with a global targets via link_libraries()
macro (export)
endmacro ()

set(CMAKE_EXPORT_COMPILE_COMMANDS 1) # Write compile_commands.json
set(CMAKE_LINK_DEPENDS_NO_SHARED 1) # Do not relink all depended targets on .so
set(CMAKE_CONFIGURATION_TYPES "RelWithDebInfo;Debug;Release;MinSizeRel" CACHE STRING "" FORCE)
set(CMAKE_DEBUG_POSTFIX "d" CACHE STRING "Generate debug library name with a postfix.")    # To be consistent with CMakeLists from contrib libs.

# Enable the ability to organize targets into hierarchies of "folders" for capable GUI-based IDEs.
# For more info see https://cmake.org/cmake/help/latest/prop_gbl/USE_FOLDERS.html
set_property(GLOBAL PROPERTY USE_FOLDERS ON)

# Check that submodules are present
if (NOT EXISTS "${ClickHouse_SOURCE_DIR}/contrib/sysroot/README.md")
    message (FATAL_ERROR "Submodules are not initialized. Run\n\tgit submodule update --init")
endif ()

# Take care to add prlimit in command line before ccache, or else ccache thinks that
# prlimit is compiler, and clang++ is its input file, and refuses to work  with
# multiple inputs, e.g in ccache log:
# [2021-03-31T18:06:32.655327 36900] Command line: /usr/bin/ccache prlimit --as=10000000000 --data=5000000000 --cpu=600 /usr/bin/clang++-11 - ...... std=gnu++2a -MD -MT src/CMakeFiles/dbms.dir/Storages/MergeTree/IMergeTreeDataPart.cpp.o -MF src/CMakeFiles/dbms.dir/Storages/MergeTree/IMergeTreeDataPart.cpp.o.d -o src/CMakeFiles/dbms.dir/Storages/MergeTree/IMergeTreeDataPart.cpp.o -c ../src/Storages/MergeTree/IMergeTreeDataPart.cpp
#
# [2021-03-31T18:06:32.656704 36900] Multiple input files: /usr/bin/clang++-11 and ../src/Storages/MergeTree/IMergeTreeDataPart.cpp
#
# Another way would be to use --ccache-skip option before clang++-11 to make
# ccache ignore it.
option(ENABLE_CHECK_HEAVY_BUILDS "Don't allow C++ translation units to compile too long or to take too much memory while compiling." OFF)
if (ENABLE_CHECK_HEAVY_BUILDS)
    # set DATA (since RSS does not work since 2.6.x+) to 5G
    set (RLIMIT_DATA 5000000000)
    # set VIRT (RLIMIT_AS) to 10G (DATA*10)
    set (RLIMIT_AS 10000000000)
    # set CPU time limit to 1000 seconds
    set (RLIMIT_CPU 1000)

    # gcc10/gcc10/clang -fsanitize=memory is too heavy
    if (SANITIZE STREQUAL "memory" OR COMPILER_GCC)
       set (RLIMIT_DATA 10000000000) # 10G
    endif()

    set (CMAKE_CXX_COMPILER_LAUNCHER prlimit --as=${RLIMIT_AS} --data=${RLIMIT_DATA} --cpu=${RLIMIT_CPU} ${CMAKE_CXX_COMPILER_LAUNCHER})
endif ()

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

string (TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)

option(USE_STATIC_LIBRARIES "Disable to use shared libraries" ON)
# DEVELOPER ONLY.
# Faster linking if turned on.
option(SPLIT_SHARED_LIBRARIES "Keep all internal libraries as separate .so files" OFF)

if (USE_STATIC_LIBRARIES AND SPLIT_SHARED_LIBRARIES)
    message(FATAL_ERROR "SPLIT_SHARED_LIBRARIES=1 must not be used together with USE_STATIC_LIBRARIES=1")
endif()

if (NOT USE_STATIC_LIBRARIES AND SPLIT_SHARED_LIBRARIES)
    set(BUILD_SHARED_LIBS 1 CACHE INTERNAL "")
endif ()

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

option (ENABLE_FUZZING "Fuzzy testing using libfuzzer" OFF)

if (ENABLE_FUZZING)
    # Also set WITH_COVERAGE=1 for better fuzzing process
    # By default this is disabled, because fuzzers are built in CI with the clickhouse itself.
    # And we don't want to enable coverage for it.
    message (STATUS "Fuzzing instrumentation enabled")
    set (FUZZER "libfuzzer")
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nostdlib++")
    set (ENABLE_CLICKHOUSE_ODBC_BRIDGE OFF)
    set (ENABLE_LIBRARIES 0)
    set (ENABLE_SSL 1)
    set (USE_UNWIND ON)
    set (ENABLE_EMBEDDED_COMPILER 0)
    set (ENABLE_EXAMPLES 0)
    set (ENABLE_UTILS 0)
    set (ENABLE_THINLTO 0)
    set (ENABLE_TCMALLOC 0)
    set (ENABLE_JEMALLOC 0)
    set (ENABLE_CHECK_HEAVY_BUILDS 1)
    set (GLIBC_COMPATIBILITY OFF)

    # For codegen_select_fuzzer
    set (ENABLE_PROTOBUF 1)
endif()

# Global libraries
# See:
# - default_libs.cmake
# - sanitize.cmake
add_library(global-libs INTERFACE)

include (cmake/fuzzer.cmake)
include (cmake/sanitize.cmake)

option(ENABLE_COLORED_BUILD "Enable colors in compiler output" ON)

set (CMAKE_COLOR_MAKEFILE ${ENABLE_COLORED_BUILD}) # works only for the makefile generator

if (ENABLE_COLORED_BUILD AND 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")
    # ... such manually setting of flags can be removed once CMake supports a variable to
    # activate colors in *all* build systems: https://gitlab.kitware.com/cmake/cmake/-/issues/15502
endif ()

include (cmake/check_flags.cmake)
include (cmake/add_warning.cmake)

if (COMPILER_CLANG)
    # generate ranges for fast "addr2line" search
    if (NOT CMAKE_BUILD_TYPE_UC STREQUAL "RELEASE")
        # NOTE: that clang has a bug because of it does not emit .debug_aranges
        # with ThinLTO, so custom ld.lld wrapper is shipped in docker images.
        set(COMPILER_FLAGS "${COMPILER_FLAGS} -gdwarf-aranges")
    endif ()

    if (HAS_USE_CTOR_HOMING)
        # For more info see https://blog.llvm.org/posts/2021-04-05-constructor-homing-for-debug-info/
        if (CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG" OR CMAKE_BUILD_TYPE_UC STREQUAL "RELWITHDEBINFO")
            set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Xclang -fuse-ctor-homing")
            set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Xclang -fuse-ctor-homing")
        endif()
    endif()

    no_warning(enum-constexpr-conversion) # breaks Protobuf in clang-16
endif ()

# If compiler has support for -Wreserved-identifier. It is difficult to detect by clang version,
# because there are two different branches of clang: clang and AppleClang.
# (AppleClang is not supported by ClickHouse, but some developers have misfortune to use it).
if (HAS_RESERVED_IDENTIFIER)
    add_compile_definitions (HAS_RESERVED_IDENTIFIER)
endif ()

option(ENABLE_TESTS "Provide unit_test_dbms target with Google.Test unit tests" ON)
option(ENABLE_EXAMPLES "Build all example programs in 'examples' subdirectories" OFF)

if (OS_LINUX AND (ARCH_AMD64 OR ARCH_AARCH64) AND USE_STATIC_LIBRARIES AND NOT SPLIT_SHARED_LIBRARIES AND NOT USE_MUSL)
    # Only for Linux, x86_64 or aarch64.
    option(GLIBC_COMPATIBILITY "Enable compatibility with older glibc libraries." ON)
elseif(GLIBC_COMPATIBILITY)
    message (${RECONFIGURE_MESSAGE_LEVEL} "Glibc compatibility cannot be enabled in current configuration")
endif ()

# Make sure the final executable has symbols exported
set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -rdynamic")

if (OS_DARWIN)
    # The `-all_load` flag forces loading of all symbols from all libraries,
    # and leads to multiply-defined symbols. This flag allows force loading
    # from a _specific_ library, which is what we need.
    set(WHOLE_ARCHIVE -force_load)
    # The `-noall_load` flag is the default and now obsolete.
    set(NO_WHOLE_ARCHIVE "-undefined,error") # Effectively, a no-op. Here to avoid empty "-Wl, " sequence to be generated in the command line.
else ()
    set(WHOLE_ARCHIVE --whole-archive)
    set(NO_WHOLE_ARCHIVE --no-whole-archive)
endif ()

option(ENABLE_CURL_BUILD "Enable curl, azure, sentry build on by default except MacOS." ON)
if (OS_DARWIN)
    # Disable the curl, azure, senry build on MacOS
    set (ENABLE_CURL_BUILD OFF)
endif ()

# Ignored if `lld` is used
option(ADD_GDB_INDEX_FOR_GOLD "Add .gdb-index to resulting binaries for gold linker.")

if (NOT CMAKE_BUILD_TYPE_UC STREQUAL "RELEASE")
    # Can be lld or ld-lld or lld-13 or /path/to/lld.
    if (LINKER_NAME MATCHES "lld" AND OS_LINUX)
        set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gdb-index")
        set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--gdb-index")
        message (STATUS "Adding .gdb-index via --gdb-index linker option.")
    # we use another tool for gdb-index, because gold linker removes section .debug_aranges, which used inside clickhouse stacktraces
    # http://sourceware-org.1504.n7.nabble.com/gold-No-debug-aranges-section-when-linking-with-gdb-index-td540965.html#a556932
    elseif (LINKER_NAME MATCHES "gold$" AND ADD_GDB_INDEX_FOR_GOLD)
        find_program (GDB_ADD_INDEX_EXE NAMES "gdb-add-index" DOC "Path to gdb-add-index executable")
        if (NOT GDB_ADD_INDEX_EXE)
            set (USE_GDB_ADD_INDEX 0)
            message (WARNING "Cannot add gdb index to binaries, because gold linker is used, but gdb-add-index executable not found.")
        else()
            set (USE_GDB_ADD_INDEX 1)
            message (STATUS "gdb-add-index found: ${GDB_ADD_INDEX_EXE}")
        endif()
    endif ()
endif()

if (CMAKE_BUILD_TYPE_UC STREQUAL "RELEASE"
    OR CMAKE_BUILD_TYPE_UC STREQUAL "RELWITHDEBINFO"
    OR CMAKE_BUILD_TYPE_UC STREQUAL "MINSIZEREL")
    set (OMIT_HEAVY_DEBUG_SYMBOLS_DEFAULT ON)
else()
    set (OMIT_HEAVY_DEBUG_SYMBOLS_DEFAULT OFF)
endif()
# Provides faster linking and lower binary size.
# Tradeoff is the inability to debug some source files with e.g. gdb
# (empty stack frames and no local variables)."
option(OMIT_HEAVY_DEBUG_SYMBOLS
    "Do not generate debugger info for heavy modules (ClickHouse functions and dictionaries, some contrib)"
    ${OMIT_HEAVY_DEBUG_SYMBOLS_DEFAULT})

if (CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG")
    set(USE_DEBUG_HELPERS ON)
endif()
option(USE_DEBUG_HELPERS "Enable debug helpers" ${USE_DEBUG_HELPERS})

option(BUILD_STANDALONE_KEEPER "Build keeper as small standalone binary" OFF)
if (NOT BUILD_STANDALONE_KEEPER)
    option(CREATE_KEEPER_SYMLINK "Create symlink for clickhouse-keeper to main server binary" ON)
else ()
    option(CREATE_KEEPER_SYMLINK "Create symlink for clickhouse-keeper to main server binary" OFF)
endif ()

# Create BuildID when using lld. For other linkers it is created by default.
# (NOTE: LINKER_NAME can be either path or name, and in different variants)
if (LINKER_NAME MATCHES "lld" AND OS_LINUX)
    # SHA1 is not cryptographically secure but it is the best what lld is offering.
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--build-id=sha1")
endif ()

# Add a section with the hash of the compiled machine code for integrity checks.
# Only for official builds, because adding a section can be time consuming (rewrite of several GB).
# And cross compiled binaries are not supported (since you cannot execute clickhouse hash-binary)
if (CLICKHOUSE_OFFICIAL_BUILD AND (NOT CMAKE_TOOLCHAIN_FILE OR CMAKE_TOOLCHAIN_FILE MATCHES "linux/toolchain-x86_64.cmake$"))
    message(STATUS "Official build: A checksum hash will be added to the clickhouse executable")
    set (USE_BINARY_HASH 1 CACHE STRING "Calculate binary hash and store it in the separate section")
else ()
    message(STATUS "No official build: A checksum hash will not be added to the clickhouse executable")
endif ()

# Optionally split binaries and debug symbols.
option(SPLIT_DEBUG_SYMBOLS "Split binaries and debug symbols" OFF)
if (SPLIT_DEBUG_SYMBOLS)
    message(STATUS "Will split binaries and debug symbols")
    set(SPLITTED_DEBUG_SYMBOLS_DIR "stripped" CACHE STRING "A separate directory for stripped information")
endif()

cmake_host_system_information(RESULT AVAILABLE_PHYSICAL_MEMORY QUERY AVAILABLE_PHYSICAL_MEMORY) # Not available under freebsd


if(NOT AVAILABLE_PHYSICAL_MEMORY OR AVAILABLE_PHYSICAL_MEMORY GREATER 8000)
    # Less `/tmp` usage, more RAM usage.
    option(COMPILER_PIPE "-pipe compiler option" ON)
endif()

if(COMPILER_PIPE)
    set(COMPILER_FLAGS "${COMPILER_FLAGS} -pipe")
else()
    message(STATUS "Disabling compiler -pipe option (have only ${AVAILABLE_PHYSICAL_MEMORY} mb of memory)")
endif()

include(cmake/cpu_features.cmake)

# Asynchronous unwind tables are needed for Query Profiler.
# They are already by default on some platforms but possibly not on all platforms.
# Enable it explicitly.
set (COMPILER_FLAGS "${COMPILER_FLAGS} -fasynchronous-unwind-tables")

# Reproducible builds.
if (CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG")
    set (ENABLE_BUILD_PATH_MAPPING_DEFAULT OFF)
else ()
    set (ENABLE_BUILD_PATH_MAPPING_DEFAULT ON)
endif ()

option (ENABLE_BUILD_PATH_MAPPING "Enable remapping of file source paths in debug info, predefined preprocessor macros, and __builtin_FILE(). It's used to generate reproducible builds. See https://reproducible-builds.org/docs/build-path" ${ENABLE_BUILD_PATH_MAPPING_DEFAULT})

if (ENABLE_BUILD_PATH_MAPPING)
    set (COMPILER_FLAGS "${COMPILER_FLAGS} -ffile-prefix-map=${CMAKE_SOURCE_DIR}=.")
    set (CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} -ffile-prefix-map=${CMAKE_SOURCE_DIR}=.")
endif ()

option (ENABLE_BUILD_PROFILING "Enable profiling of build time" OFF)
if (ENABLE_BUILD_PROFILING)
     if (COMPILER_CLANG)
        set (COMPILER_FLAGS "${COMPILER_FLAGS} -ftime-trace")
     else ()
        message (${RECONFIGURE_MESSAGE_LEVEL} "Build profiling is only available with CLang")
     endif ()
endif ()

set (CMAKE_CXX_STANDARD 20)
set (CMAKE_CXX_EXTENSIONS ON) # Same as gnu++2a (ON) vs c++2a (OFF): https://cmake.org/cmake/help/latest/prop_tgt/CXX_EXTENSIONS.html
set (CMAKE_CXX_STANDARD_REQUIRED ON)

set (CMAKE_C_STANDARD 11)
set (CMAKE_C_EXTENSIONS ON)
set (CMAKE_C_STANDARD_REQUIRED ON)

if (COMPILER_GCC OR COMPILER_CLANG)
    # Enable C++14 sized global deallocation functions. It should be enabled by setting -std=c++14 but I'm not sure.
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsized-deallocation")
endif ()

# falign-functions=32 prevents from random performance regressions with the code change. Thus, providing more stable
# benchmarks.
if (COMPILER_GCC OR COMPILER_CLANG)
    set(COMPILER_FLAGS "${COMPILER_FLAGS} -falign-functions=32")
endif ()

if (ARCH_AMD64)
    # align branches within a 32-Byte boundary to avoid the potential performance loss when code layout change,
    # which makes benchmark results more stable.
    set(BRANCHES_WITHIN_32B_BOUNDARIES "-mbranches-within-32B-boundaries")
    if (COMPILER_GCC)
        # gcc is in assembler, need to add "-Wa," prefix
        set(BRANCHES_WITHIN_32B_BOUNDARIES "-Wa,${BRANCHES_WITHIN_32B_BOUNDARIES}")
    endif()

    include(CheckCXXCompilerFlag)
    check_cxx_compiler_flag("${BRANCHES_WITHIN_32B_BOUNDARIES}" HAS_BRANCHES_WITHIN_32B_BOUNDARIES)
    if (HAS_BRANCHES_WITHIN_32B_BOUNDARIES)
        set(COMPILER_FLAGS "${COMPILER_FLAGS} ${BRANCHES_WITHIN_32B_BOUNDARIES}")
    endif()
endif()

if (COMPILER_GCC)
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcoroutines")
endif ()

# Compiler-specific coverage flags e.g. -fcoverage-mapping for gcc
option(WITH_COVERAGE "Profile the resulting binary/binaries" OFF)

if (WITH_COVERAGE AND COMPILER_CLANG)
    set(COMPILER_FLAGS "${COMPILER_FLAGS} -fprofile-instr-generate -fcoverage-mapping")
    # If we want to disable coverage for specific translation units
    set(WITHOUT_COVERAGE "-fno-profile-instr-generate -fno-coverage-mapping")
endif()

if (WITH_COVERAGE AND COMPILER_GCC)
    set(COMPILER_FLAGS "${COMPILER_FLAGS} -fprofile-arcs -ftest-coverage")
    set(COVERAGE_OPTION "-lgcov")
    set(WITHOUT_COVERAGE "-fno-profile-arcs -fno-test-coverage")
endif()

set (COMPILER_FLAGS "${COMPILER_FLAGS}")

# Our built-in unwinder only supports DWARF version up to 4.
set (DEBUG_INFO_FLAGS "-g -gdwarf-4")

set (CMAKE_CXX_FLAGS                     "${CMAKE_CXX_FLAGS} ${COMPILER_FLAGS}")
set (CMAKE_CXX_FLAGS_RELWITHDEBINFO      "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -O3 ${DEBUG_INFO_FLAGS} ${CMAKE_CXX_FLAGS_ADD}")
set (CMAKE_CXX_FLAGS_DEBUG               "${CMAKE_CXX_FLAGS_DEBUG} -O0 ${DEBUG_INFO_FLAGS} -fno-inline ${CMAKE_CXX_FLAGS_ADD}")

set (CMAKE_C_FLAGS                       "${CMAKE_C_FLAGS} ${COMPILER_FLAGS} ${CMAKE_C_FLAGS_ADD}")
set (CMAKE_C_FLAGS_RELWITHDEBINFO        "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O3 ${DEBUG_INFO_FLAGS} ${CMAKE_C_FLAGS_ADD}")
set (CMAKE_C_FLAGS_DEBUG                 "${CMAKE_C_FLAGS_DEBUG} -O0 ${DEBUG_INFO_FLAGS} -fno-inline ${CMAKE_C_FLAGS_ADD}")

set (CMAKE_ASM_FLAGS                     "${CMAKE_ASM_FLAGS} ${COMPILER_FLAGS} ${CMAKE_ASM_FLAGS_ADD}")
set (CMAKE_ASM_FLAGS_RELWITHDEBINFO      "${CMAKE_ASM_FLAGS_RELWITHDEBINFO} -O3 ${DEBUG_INFO_FLAGS} ${CMAKE_ASM_FLAGS_ADD}")
set (CMAKE_ASM_FLAGS_DEBUG               "${CMAKE_ASM_FLAGS_DEBUG} -O0 ${DEBUG_INFO_FLAGS} -fno-inline ${CMAKE_ASM_FLAGS_ADD}")

if (COMPILER_CLANG)
    if (OS_DARWIN)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-U,_inside_main")
    endif()

    # Display absolute paths in error messages. Otherwise KDevelop fails to navigate to correct file and opens a new file instead.
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-absolute-paths")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdiagnostics-absolute-paths")

    if (NOT ENABLE_TESTS AND NOT SANITIZE)
        # https://clang.llvm.org/docs/ThinLTO.html
        # Applies to clang only.
        # Disabled when building with tests or sanitizers.
        option(ENABLE_THINLTO "Clang-specific link time optimization" ON)
    endif()

    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstrict-vtable-pointers")

    # Set new experimental pass manager, it's a performance, build time and binary size win.
    # Can be removed after https://reviews.llvm.org/D66490 merged and released to at least two versions of clang.
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fexperimental-new-pass-manager")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fexperimental-new-pass-manager")

    # We cannot afford to use LTO when compiling unit tests, and it's not enough
    # to only supply -fno-lto at the final linking stage. So we disable it
    # completely.
    if (ENABLE_THINLTO AND NOT ENABLE_TESTS AND NOT SANITIZE)
        # Link time optimization
        set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -flto=thin -fwhole-program-vtables")
        set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -flto=thin -fwhole-program-vtables")
        set (CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} -flto=thin -fwhole-program-vtables")
    elseif (ENABLE_THINLTO)
        message (${RECONFIGURE_MESSAGE_LEVEL} "Cannot enable ThinLTO")
    endif ()

elseif (ENABLE_THINLTO)
    message (${RECONFIGURE_MESSAGE_LEVEL} "ThinLTO is only available with Clang")
endif ()

# Turns on all external libs like s3, kafka, ODBC, ...
option(ENABLE_LIBRARIES "Enable all external libraries by default" ON)

# Increase stack size on Musl. We need big stack for our recursive-descend parser.
if (USE_MUSL)
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-z,stack-size=2097152")
endif ()

include(cmake/dbms_glob_sources.cmake)

add_library(global-group INTERFACE)
if (OS_LINUX OR OS_ANDROID)
    include(cmake/linux/default_libs.cmake)
elseif (OS_DARWIN)
    include(cmake/darwin/default_libs.cmake)
elseif (OS_FREEBSD)
    include(cmake/freebsd/default_libs.cmake)
else()
    link_libraries(global-group)
endif ()

if (NOT (OS_LINUX OR OS_DARWIN))
    # Using system libs can cause a lot of warnings in includes (on macro expansion).
    option(WERROR "Enable -Werror compiler option" OFF)
else ()
    option(WERROR "Enable -Werror compiler option" ON)
endif ()

if (WERROR)
    # Don't pollute CMAKE_CXX_FLAGS with -Werror as it will break some CMake checks.
    # Instead, adopt modern cmake usage requirement.
    target_compile_options(global-group INTERFACE "-Werror")
endif ()

# Make this extra-checks for correct library dependencies.
if (OS_LINUX AND NOT SANITIZE)
    target_link_options(global-group INTERFACE "LINKER:--no-undefined")
endif ()

######################################
### Add targets below this comment ###
######################################

set (CMAKE_POSTFIX_VARIABLE "CMAKE_${CMAKE_BUILD_TYPE_UC}_POSTFIX")

if (USE_STATIC_LIBRARIES)
    set (CMAKE_POSITION_INDEPENDENT_CODE OFF)
    if (OS_LINUX AND NOT ARCH_AARCH64)
        # Slightly more efficient code can be generated
        # It's disabled for ARM because otherwise ClickHouse cannot run on Android.
        set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -fno-pie")
        set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -fno-pie")
        set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -no-pie -Wl,-no-pie")
    endif ()
else ()
    set (CMAKE_POSITION_INDEPENDENT_CODE ON)
    # This is required for clang on Arch linux, that uses PIE by default.
    # See enable-SSP-and-PIE-by-default.patch [1].
    #
    #   [1]: https://github.com/archlinux/svntogit-packages/blob/6e681aa860e65ad46a1387081482eb875c2200f2/trunk/enable-SSP-and-PIE-by-default.patch
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -no-pie")
endif ()

if (ENABLE_TESTS)
    message (STATUS "Unit tests are enabled")
else()
    message(STATUS "Unit tests are disabled")
endif ()

enable_testing() # Enable for tests without binary

option(ENABLE_EXTERNAL_OPENSSL "This option is insecure and not recommended for any occasions. If it is enabled, it allows building with alternative OpenSSL library. By default, ClickHouse is using BoringSSL, which is better. Do not use this option." OFF)

if (ENABLE_EXTERNAL_OPENSSL)
    message (STATUS "Build and uses OpenSSL library instead of BoringSSL. This is strongly discouraged. Your build of ClickHouse will be unsupported.")
    set(ENABLE_SSL 1)
    target_compile_options(global-group INTERFACE "-Wno-deprecated-declarations")
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 ()

message (STATUS
    "Building for: ${CMAKE_SYSTEM} ${CMAKE_SYSTEM_PROCESSOR} ${CMAKE_LIBRARY_ARCHITECTURE} ;
    USE_STATIC_LIBRARIES=${USE_STATIC_LIBRARIES}
    SPLIT_SHARED_LIBRARIES=${SPLIT_SHARED_LIBRARIES}")

include (GNUInstallDirs)

# When testing for memory leaks with Valgrind, don't link tcmalloc or jemalloc.

if (TARGET global-group)
    install (EXPORT global DESTINATION cmake)
endif ()

add_subdirectory (contrib EXCLUDE_FROM_ALL)

if (NOT ENABLE_JEMALLOC)
    message (WARNING "Non default allocator is disabled. This is not recommended for production builds.")
endif ()

macro (clickhouse_add_executable target)
    # invoke built-in add_executable
    # explicitly acquire and interpose malloc symbols by clickhouse_malloc
    # if GLIBC_COMPATIBILITY is ON and ENABLE_THINLTO is on than provide memcpy symbol explicitly to neutrialize thinlto's libcall generation.
    if (ARCH_AMD64 AND GLIBC_COMPATIBILITY AND ENABLE_THINLTO)
        add_executable (${ARGV} $<TARGET_OBJECTS:clickhouse_malloc> $<TARGET_OBJECTS:memcpy>)
    else ()
        add_executable (${ARGV} $<TARGET_OBJECTS:clickhouse_malloc>)
    endif ()

    get_target_property (type ${target} TYPE)
    if (${type} STREQUAL EXECUTABLE)
        # disabled for TSAN and gcc since libtsan.a provides overrides too
        if (TARGET clickhouse_new_delete)
            # operator::new/delete for executables (MemoryTracker stuff)
            target_link_libraries (${target} PRIVATE clickhouse_new_delete)
        endif()

        # In case of static jemalloc, because zone_register() is located in zone.c and
        # is never used outside (it is declared as constructor) it is omitted
        # by the linker, and so jemalloc will not be registered as system
        # allocator under osx [1], and clickhouse will SIGSEGV.
        #
        #   [1]: https://github.com/jemalloc/jemalloc/issues/708
        #
        # About symbol name:
        # - _zone_register not zone_register due to Mach-O binary format,
        # - _je_zone_register due to JEMALLOC_PRIVATE_NAMESPACE=je_ under OS X.
        # - but jemalloc-cmake does not run private_namespace.sh
        #   so symbol name should be _zone_register
        if (ENABLE_JEMALLOC AND USE_STATIC_LIBRARIES AND OS_DARWIN)
            set_property(TARGET ${target} APPEND PROPERTY LINK_OPTIONS -u_zone_register)
        endif()
    endif()
endmacro()

# With cross-compiling, all targets are built for the target platform which usually different from the host
# platform. This is problematic if a build artifact X (e.g. a file or an executable) is generated by running
# another executable Y previously produced in the build. This is solved by compiling and running Y for/on
# the host platform. Add target to the list:
#    add_native_target(<target> ...)
set_property (GLOBAL PROPERTY NATIVE_BUILD_TARGETS)
function (add_native_target)
    set_property (GLOBAL APPEND PROPERTY NATIVE_BUILD_TARGETS ${ARGV})
endfunction (add_native_target)

set(CONFIG_INCLUDE_PATH ${CMAKE_CURRENT_BINARY_DIR}/includes/configs CACHE INTERNAL "Path to generated configuration files.")
include_directories(${CONFIG_INCLUDE_PATH})

# Add as many warnings as possible for our own code.
include (cmake/warnings.cmake)
include (cmake/print_flags.cmake)

if (ENABLE_RUST)
    add_subdirectory (rust)
endif()

add_subdirectory (base)
add_subdirectory (src)
add_subdirectory (programs)
add_subdirectory (tests)
add_subdirectory (utils)

include (cmake/sanitize_targets.cmake)

# Build native targets if necessary
get_property(NATIVE_BUILD_TARGETS GLOBAL PROPERTY NATIVE_BUILD_TARGETS)
if (NATIVE_BUILD_TARGETS
    AND NOT(
        CMAKE_HOST_SYSTEM_NAME STREQUAL CMAKE_SYSTEM_NAME
        AND CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL CMAKE_SYSTEM_PROCESSOR
    )
)
    message (STATUS "Building native targets...")

    set (NATIVE_BUILD_DIR "${CMAKE_BINARY_DIR}/native")

    execute_process(
        COMMAND ${CMAKE_COMMAND} -E make_directory "${NATIVE_BUILD_DIR}"
        COMMAND_ECHO STDOUT)

    execute_process(
        COMMAND ${CMAKE_COMMAND}
            "-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}"
            "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
            "-DENABLE_CCACHE=${ENABLE_CCACHE}"
            "-DENABLE_CLICKHOUSE_SELF_EXTRACTING=${ENABLE_CLICKHOUSE_SELF_EXTRACTING}"
        ${CMAKE_SOURCE_DIR}
        WORKING_DIRECTORY "${NATIVE_BUILD_DIR}"
        COMMAND_ECHO STDOUT)

    execute_process(
        COMMAND ${CMAKE_COMMAND} --build "${NATIVE_BUILD_DIR}" --target ${NATIVE_BUILD_TARGETS}
        COMMAND_ECHO STDOUT)
endif ()