cmake_minimum_required(VERSION 3.25)

# Some CMakeLists.txt in contrib/ are not being good citizens and change cmake cache variables
# globally. This policy prevents such *cache* variable assignments from altering *normal* variables
# that we've set.
#
# Example: suppose our root CMakeLists.txt assigns a normal variable:
#   set(CMAKE_CXX_STANDARD 23)
# then llvm-project assigns cache variable with the same name:
#   set(CMAKE_CXX_STANDARD 17 CACHE STRING "...")
# The latter assignment doesn't affect the normal variable, so llvm-project effectively uses C++23.
#
# Without this policy, the behavior is nonlocal and brittle: if the cache variable doesn't exists,
# the normal variable is unset; otherwise it's left alone. So the effective value would depend e.g.
# on the order in which contrib/ libraries are traversed.
set (CMAKE_POLICY_DEFAULT_CMP0126 NEW)

project(Datastore 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)

# This allows to compile some code conditionally in the private build while having byte-identical source files.
set (DATASTORE_CLOUD 0)

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)
include (cmake/utils.cmake)

# This is needed to set up the CMAKE_INSTALL_BINDIR variable.
include (GNUInstallDirs)

# Ignore export() since we don't use it,
# but it gets broken with 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

# 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 "${Datastore_SOURCE_DIR}/contrib/sysroot/README.md")
    message (FATAL_ERROR "Submodules are not initialized. Run\n\tgit submodule update --init")
endif ()

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)
    enable_heavy_build_check_if_needed()
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)

list(REVERSE CMAKE_FIND_LIBRARY_SUFFIXES)

option (ENABLE_FUZZING "Fuzzy testing using libfuzzer" OFF)
option (ENABLE_BUZZHOUSE "Enable BuzzHouse fuzzer on the client" OFF)
option (ENABLE_FUZZER_TEST "Build testing fuzzers in order to test libFuzzer functionality" OFF)

if (ENABLE_FUZZING)
    message (STATUS "Fuzzing instrumentation enabled")
    set (FUZZER "libfuzzer")
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nostdlib++")
    set (ENABLE_SSL 1)
    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)
    set (ENABLE_BENCHMARKS 0)
    set (ENABLE_DATASTORE_KEEPER 0)

    # For codegen_select_fuzzer
    set (ENABLE_PROTOBUF 1)
endif()

if (ENABLE_BUZZHOUSE)
    set (ENABLE_SSL 1)
    set (ENABLE_PROTOBUF 1)
endif()

option (ENABLE_XRAY "Enable LLVM XRay" OFF)

if (NOT ENABLE_XRAY)
    message (STATUS "Not using LLVM XRay because it's disabled")
    set (ENABLE_XRAY 0)
endif()

if (NOT ((ARCH_AMD64 OR ARCH_AARCH64) AND OS_LINUX) OR SANITIZE OR USE_MUSL)
    message (STATUS "Not using LLVM XRay, only Linux on amd64 and aarch64 is supported without sanitizers")
    set (ENABLE_XRAY 0)
endif()

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

include (cmake/sanitize.cmake)
include (cmake/profile_optimization.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
    # --> available since CMake 3.24: https://stackoverflow.com/a/73349744
endif ()

include (cmake/add_warning.cmake)

# A compiler without zlib accepts -gz but only warns, so -Werror on that warning makes the check fail.
include (CheckCompilerFlag)
set (CMAKE_REQUIRED_FLAGS "-Werror=debug-compression-unavailable")
check_compiler_flag (C   "-gz=zlib" C_COMPILER_SUPPORTS_GZ_ZLIB)
check_compiler_flag (CXX "-gz=zlib" CXX_COMPILER_SUPPORTS_GZ_ZLIB)
unset (CMAKE_REQUIRED_FLAGS)
set (COMPILER_SUPPORTS_GZ_ZLIB OFF)
if (C_COMPILER_SUPPORTS_GZ_ZLIB AND CXX_COMPILER_SUPPORTS_GZ_ZLIB)
    set (COMPILER_SUPPORTS_GZ_ZLIB ON)
endif ()

# Block build-time CMake probes (check_*, try_compile, try_run) project-wide. Compiler and
# toolchain are fixed (see cmake/tools.cmake), so feature detection is unnecessary - any
# version-dependent behaviour must be gated on CMAKE_CXX_COMPILER_VERSION explicitly.
include (cmake/block_build_time_checks.cmake)

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

if (OS_LINUX AND (ARCH_AMD64 OR ARCH_AARCH64) 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 ()

if (OS_LINUX)
    # We should not export dynamic symbols, because:
    # - The main datastore binary does not use dlopen,
    #   and whatever is poisoning it by LD_PRELOAD should not link to our symbols.
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--no-export-dynamic -Wl,--gc-sections")

    if (LINKER_NAME MATCHES "lld" AND NOT SANITIZE AND NOT SANITIZE_COVERAGE AND NOT WITH_COVERAGE)
        # Fold identical code and data sections to reduce binary size.
        set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--icf=all")
    endif ()

    # In Release builds, strip residual debug sections that may come from contrib
    # libraries or Rust crates compiled with debug info by their own build systems.
    if (CMAKE_BUILD_TYPE_UC STREQUAL "RELEASE" AND NOT SPLIT_DEBUG_SYMBOLS)
        set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--strip-debug")
    endif ()
endif ()

if (OS_DARWIN)
    # Same reasoning as `--no-export-dynamic` on Linux: the main datastore binary does not
    # use dlopen, so it does not need to export any dynamic symbols. By default the Mach-O
    # linker puts every global symbol into the export trie (hundreds of thousands of them for
    # datastore), which dyld walks for weak-symbol coalescing on every launch, adding ~0.15s
    # of startup latency. An empty `-exported_symbols_list` suppresses the export trie while
    # keeping the LC_SYMTAB used for backtraces intact. We use it instead of the simpler
    # `-no_exported_symbols` because the latter is not understood by the cctools `ld` used for
    # cross-compilation in CI, while `-exported_symbols_list` is supported by both it and lld.
    #
    # Skip this for sanitizer builds: on Darwin we rely on Apple's bundled sanitizer runtime,
    # which resolves hooks such as `__asan_default_options` / `__lsan_default_suppressions`
    # (see base/base/sanitizer_options.h) by symbol name via dyld weak-symbol coalescing.
    # Hiding the executable's exports would silently drop those options. Sanitizer builds are
    # for testing and do not need the startup optimization anyway.
    if (NOT SANITIZE)
        set (EMPTY_EXPORTED_SYMBOLS_LIST "${CMAKE_BINARY_DIR}/empty_exported_symbols.txt")
        file (WRITE "${EMPTY_EXPORTED_SYMBOLS_LIST}" "")
        set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-exported_symbols_list,${EMPTY_EXPORTED_SYMBOLS_LIST}")
    endif ()

    # Remove unreachable functions/data (Darwin equivalent of --gc-sections).
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-dead_strip")

    # 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 ()

if (NOT (SANITIZE_COVERAGE OR WITH_COVERAGE)
    AND (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).
# In Release builds (which have no debug info by default), this option has
# no effect -- it only reduces debug info for RelWithDebInfo and MinSizeRel.
option(OMIT_HEAVY_DEBUG_SYMBOLS
    "Do not generate debugger info for heavy modules (Datastore functions and dictionaries, some contrib)"
    ${OMIT_HEAVY_DEBUG_SYMBOLS_DEFAULT})

option(BUILD_STANDALONE_KEEPER "Build keeper as small standalone binary" OFF)

# 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 NOT LINKER_NAME MATCHES "ld64")
    # SHA1 is not cryptographically secure but it is the best what lld is offering.
    # ld64.lld (MachO linker) does not support --build-id.
    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 datastore hash-binary)
if (DATASTORE_OFFICIAL_BUILD AND OS_LINUX AND (ARCH_AMD64 OR ARCH_AARCH64) AND NOT ENABLE_CLANG_TIDY)
    message(STATUS "Official build: A checksum hash will be added to the datastore 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 datastore executable")
endif ()

# Optionally split binaries and debug symbols.
option(DISABLE_ALL_DEBUG_SYMBOLS "Disable debug symbols, independently of which build type is used" OFF)
option(SPLIT_DEBUG_SYMBOLS "Split binaries and debug symbols" OFF)
if (SPLIT_DEBUG_SYMBOLS)
    message(STATUS "Will split binaries and debug symbols")
    set(SPLIT_DEBUG_SYMBOLS_DIR "stripped" CACHE STRING "A separate directory for stripped information")
endif()

option(BUILD_STRIPPED_BINARY "Build stripped binary (datastore-stripped)" OFF)

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)


# Query Profiler doesn't work on MacOS for several reasons
# - PHDR cache is not available
# - We use native functionality to get stacktraces which is not async signal safe
# and thus we don't need to generate asynchronous unwind tables
if (NOT OS_DARWIN)
    # 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")
endif()

# 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 ()

if (COMPILER_CACHE STREQUAL "chcache")
    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)
    # Fix DW_AT_comp_dir to "." regardless of the build directory location, then strip the source
    # directory prefix from all file paths (trailing slash ensures the separator is stripped too,
    # leaving bare relative paths like "src/Foo.cpp" that the symbolizer resolves to "./src/Foo.cpp").
    set (COMPILER_FLAGS "${COMPILER_FLAGS} -fdebug-compilation-dir=. -ffile-prefix-map=${PROJECT_SOURCE_DIR}/=")
    set (CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} -fdebug-compilation-dir=. -ffile-prefix-map=${PROJECT_SOURCE_DIR}/=")
endif ()

option (ENABLE_BUILD_PROFILING "Enable profiling of build time" OFF)
if (ENABLE_BUILD_PROFILING)
    set (COMPILER_FLAGS "${COMPILER_FLAGS} -ftime-trace")

    if (LINKER_NAME MATCHES "lld")
        set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--time-trace")
        set (CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,--time-trace")
    endif ()
endif ()

set (CMAKE_CXX_STANDARD 23)
set (CMAKE_CXX_EXTENSIONS OFF)
set (CMAKE_CXX_STANDARD_REQUIRED ON)

set (CMAKE_C_STANDARD 11)
set (CMAKE_C_EXTENSIONS ON) # required by most contribs written in C
set (CMAKE_C_STANDARD_REQUIRED ON)

# Align functions and loops to reduce performance sensitivity to code layout changes,
# providing more stable benchmarks.
set(COMPILER_FLAGS "${COMPILER_FLAGS} -falign-functions=64 -falign-loops=32")

# Put each function and data item into its own section so that the linker can
# remove unused ones (--gc-sections / -dead_strip) and fold identical ones (--icf).
# Sanitizer and coverage builds do not benefit from these size optimizations
# and the extra sections hurt instruction-cache locality in hot loops,
# causing timing-sensitive tests to fail.
if (NOT SANITIZE AND NOT SANITIZE_COVERAGE AND NOT WITH_COVERAGE)
    set(COMPILER_FLAGS "${COMPILER_FLAGS} -ffunction-sections -fdata-sections")
    # -faddrsig emits an address-significance table that lets lld's ICF
    # distinguish address-taken symbols from non-address-taken ones.
    # Only useful on Linux where we use lld with --icf=all; Darwin's ld64
    # does not consume these sections.
    if (OS_LINUX)
        set(COMPILER_FLAGS "${COMPILER_FLAGS} -faddrsig")
    endif ()
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")
    set(COMPILER_FLAGS "${COMPILER_FLAGS} ${BRANCHES_WITHIN_32B_BOUNDARIES}")
endif()

# Disable floating-point expression contraction in order to get consistent floating point calculation results across platforms
set (COMPILER_FLAGS "${COMPILER_FLAGS} -ffp-contract=off")

# Do not maintain `errno` for math functions (`sqrt`, `log`, `pow`, ...). This changes no
# computed result - `errno` is the only observable difference and ClickHouse never reads it
# after a libm call - but it lets the compiler emit math instructions directly instead of
# guarding each call with a branch to a libm wrapper, which also unblocks vectorization.
# Clang's default on Linux is `-fmath-errno` (errno-setting), so this is not already implied.
set (COMPILER_FLAGS "${COMPILER_FLAGS} -fno-math-errno")

# `-fno-math-errno` lets the compiler fold, hoist, and eliminate libm calls. That can remove the
# last `src/`-side references to a libm function, leaving its only references in contrib objects
# (e.g. usearch, arrow) that are linked after our in-tree `glibc-compatibility` math archive. Since
# an archive member is pulled only to satisfy an already-undefined symbol, the in-tree object is
# never extracted and the reference binds to shared glibc's newer symbol version, which the
# compatibility check rejects (max allowed GLIBC version is 2.4 on amd64, 2.18 on aarch64). Force
# our in-tree `musl` implementations to be pulled from the static archive so they preempt glibc,
# in the same spirit as the explicit `memcpy` interposition in `datastore_add_executable` below.
#
# Both the single-precision functions (new glibc version `@GLIBC_2.27`) and the double-precision
# ones (`@GLIBC_2.29`) are pinned. The doubles matter when `ENABLE_LLVM_LIBC_MATH=OFF`: in that
# configuration llvm-libc does not provide them, so `exp`/`log`/`pow`/`exp2`/`log2` are available
# only from the earlier `glibc-compatibility` archive and a later contrib reference can otherwise
# bind to glibc's `@GLIBC_2.29` symbols above the floor. With llvm-libc on they are already pulled
# from it, so the extra `-u` requests are harmless no-ops.
if (GLIBC_COMPATIBILITY)
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-u,logf -Wl,-u,powf -Wl,-u,expf -Wl,-u,exp2f -Wl,-u,log2f -Wl,-u,log -Wl,-u,pow -Wl,-u,exp -Wl,-u,exp2 -Wl,-u,log2")
endif ()

set (DEBUG_INFO_FLAGS "-g")
if (DISABLE_ALL_DEBUG_SYMBOLS)
    set (DEBUG_INFO_FLAGS "-g0")
endif()

if (OS_DARWIN)
    # On Darwin the optimizatiosns to reduce the debug size are off by default. `-fno-standalone-debug` enables them
    set (DEBUG_INFO_FLAGS "${DEBUG_INFO_FLAGS} -fno-standalone-debug")
endif()

# 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(DEBUG_INFO_FLAGS "${DEBUG_INFO_FLAGS} -gdwarf-aranges")
endif ()

# Compress DWARF debug sections (`.debug_*`) in object files with -gz=zlib to shrink the build dir
# (debug info dominates it). Compile-only via add_compile_options, so binaries stay uncompressed and
# the symbolizer is unaffected. Defaults on where the compiler supports it (probed above).
option (COMPRESS_DEBUG_SECTIONS "Compress DWARF debug sections in object files with zlib (-gz)" ${COMPILER_SUPPORTS_GZ_ZLIB})

if (COMPRESS_DEBUG_SECTIONS)
    # Only C/C++ (and GNU-style ASM handled by clang) understand -gz; scope it away from other
    # languages such as ASM_NASM (ISA-L on amd64), whose nasm assembler rejects the flag.
    add_compile_options ($<$<COMPILE_LANGUAGE:C,CXX,ASM>:-gz=zlib>)
endif ()

# Disable omit frame pointer compiler optimization using -fno-omit-frame-pointer
option(DISABLE_OMIT_FRAME_POINTER "Disable omit frame pointer compiler optimization" OFF)

if (DISABLE_OMIT_FRAME_POINTER)
    set (CMAKE_CXX_FLAGS_ADD "${CMAKE_CXX_FLAGS_ADD} -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer")
    set (CMAKE_C_FLAGS_ADD "${CMAKE_C_FLAGS_ADD} -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer")
    set (CMAKE_ASM_FLAGS_ADD "${CMAKE_ASM_FLAGS_ADD} -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer")
endif()

# Before you start hating your debugger because it refuses to show variables ('<optimized out>'), try building with -DDEBUG_O_LEVEL="0"
# https://stackoverflow.com/questions/63386189/whats-the-difference-between-a-compilers-o0-option-and-og-option/63386263#63386263
set(DEBUG_O_LEVEL "g" CACHE STRING "The -Ox level used for debug builds")

set (CMAKE_CXX_FLAGS                     "${CMAKE_CXX_FLAGS} ${COMPILER_FLAGS} ${CMAKE_CXX_FLAGS_ADD}")
set (CMAKE_CXX_FLAGS_RELWITHDEBINFO      "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -O3 ${DEBUG_INFO_FLAGS} ${CMAKE_CXX_FLAGS_ADD}")
set (CMAKE_CXX_FLAGS_DEBUG               "${CMAKE_CXX_FLAGS_DEBUG} -O${DEBUG_O_LEVEL} ${DEBUG_INFO_FLAGS} ${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} -O${DEBUG_O_LEVEL} ${DEBUG_INFO_FLAGS} ${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} -O${DEBUG_O_LEVEL} ${DEBUG_INFO_FLAGS} ${CMAKE_ASM_FLAGS_ADD}")

if (OS_DARWIN)
    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")

# https://clang.llvm.org/docs/ThinLTO.html
# Applies to clang and linux only.
# Disabled by default; explicitly enabled in CI for release and performance builds.
option(ENABLE_THINLTO "Clang-specific link time optimization" OFF)

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

# CFI requires ThinLTO. Validate here, after ENABLE_THINLTO has been resolved by
# the option() call above. sanitize.cmake is included earlier (before the option()
# declaration) so the check must live here where ENABLE_THINLTO is fully defined.
if (ENABLE_CFI AND NOT ENABLE_THINLTO)
    message (FATAL_ERROR "ENABLE_CFI requires ENABLE_THINLTO. "
        "CFI needs -flto=thin and -fwhole-program-vtables which are only applied "
        "when ThinLTO is enabled. Current configuration has ENABLE_THINLTO=${ENABLE_THINLTO}.")
endif ()

if (ENABLE_CFI AND ENABLE_TESTS)
    message (FATAL_ERROR "ENABLE_CFI is incompatible with ENABLE_TESTS. "
        "ThinLTO (required by CFI) is disabled when building tests. "
        "Build without tests (ENABLE_TESTS=0) to use CFI.")
endif ()

# CFI flags are wired into the RelWithDebInfo profile only (CMAKE_*_FLAGS_RELWITHDEBINFO).
# Other build types would configure successfully and print the CFI status message while
# silently producing a non-CFI binary, so reject them explicitly.
if (ENABLE_CFI AND NOT CMAKE_BUILD_TYPE_UC STREQUAL "RELWITHDEBINFO")
    message (FATAL_ERROR "ENABLE_CFI is only supported with CMAKE_BUILD_TYPE=RelWithDebInfo. "
        "Current configuration has CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}.")
endif ()

# 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")

    if(LINKER_NAME MATCHES "lld")
        set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} -Wl,--lto-whole-program-visibility")
    endif()

    if (ENABLE_CFI)
        # CFI checks: virtual dispatch type safety and bad downcasts via static_cast.
        # cfi-icall is omitted because C function pointers in contrib libraries (compiled without
        # CFI) would cause false positives. Start conservative; broaden after baseline is clean.
        # cfi-vcall and cfi-derived-cast are C++-only checks; do not apply to C compilation.
        #
        # Use `-fvisibility=default` rather than the CFI-documented `hidden`: with hidden
        # visibility the build succeeds (with `-Wunique-object-duplication` suppressed) but the
        # resulting binary crashes with SIGSEGV before main runs, because inline-static singletons
        # like `Context::global_context_instance` and `BaseSettings::unknown_settings` get
        # duplicated per translation unit and singleton identity is broken. Validated empirically
        # by WeeklyCFI run 25790910376 — `clickhouse-server --version` exited with signal 11.
        # CFI vtable visibility is still satisfied for in-binary types because
        # `-fwhole-program-vtables` and `-Wl,--lto-whole-program-visibility` (set above) cause
        # the linker to treat all vtables as internal to the binary.
        #
        # CFI is left in the default trap mode: a violation executes an illegal instruction
        # (SIGILL) and CI's core-dump handler yields a stack trace pinpointing the bad vcall/cast.
        # Diagnostic mode (`-fno-sanitize-trap=cfi`, which prints a UBSan-style type/location
        # report) is deliberately NOT used: it makes Clang link `libclang_rt.ubsan_standalone`,
        # which this toolchain does not ship (only select compiler-rt libs are built from contrib),
        # so even host tools like `protoc` fail to link — validated by WeeklyCFI run 28943752776.
        # `-fno-sanitize-recover=cfi` is redundant in trap mode but kept as an explicit marker that
        # a violation must never be continued past.
        set (CFI_FLAGS "-fsanitize=cfi-vcall,cfi-derived-cast -fno-sanitize-recover=cfi -fvisibility=default")
        set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${CFI_FLAGS}")
        set (CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} ${CFI_FLAGS}")
    endif ()
elseif (ENABLE_THINLTO)
    message (${RECONFIGURE_MESSAGE_LEVEL} "Cannot enable ThinLTO")
endif ()

if(COMPILER_PIPE)
    set(MAX_COMPILER_MEMORY 2500)
else()
    set(MAX_COMPILER_MEMORY 1500)
endif()
set(MAX_LINKER_MEMORY 5000)
if (ENABLE_FUZZING)
    # Fuzzer builds produce many large ASan-instrumented binaries.
    # Each linker instance needs significantly more memory than the default.
    set(MAX_LINKER_MEMORY 16000)
endif()
include(cmake/limit_jobs.cmake)


# 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
# and for analyzer passes that recurse on deeply-nested join trees (e.g.
# 1000-join queries). Match glibc's 8 MiB default; musl reads this from
# PT_GNU_STACK and clamps it to DEFAULT_STACK_MAX (also 8 MiB).
if (USE_MUSL)
    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-z,stack-size=8388608")
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)
elseif (OS_SUNOS)
    include(cmake/sunos/default_libs.cmake)
endif ()
link_libraries(global-group)
target_link_libraries(global-group INTERFACE $<TARGET_PROPERTY:global-libs,INTERFACE_LINK_LIBRARIES>)

option (ENABLE_LIBFIU "Enable libfiu" ON)

option(WERROR "Enable -Werror compiler option" ON)

if (WERROR)
    # Don't pollute CMAKE_CXX_FLAGS with -Werror as it will break some CMake checks.
    # Instead, adopt modern cmake usage requirement.
    # TODO: Set CMAKE_COMPILE_WARNING_AS_ERROR (cmake 3.24)
    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")

# We enable position independent encoding for all build types except build with -flto=thin:
# 1. Position independent binaries and libraries have no limit for maximum size of relocation. It allows to avoid
# multiple sophisticated problems like linking with sanitizers or linking of rust.
# 2. Position independent binaries and libraries are a little bit slower, than position dependent. We consider
# build with -flto=thin as trully "production" build where each % of performance is important.
# 3. For some unknow reason -flto=thin lead to some other way of linkage. For example for rust libraries build
# we don't see any relocation-related errors without -fPIC, but with enabled -flto=thin. While without
# -flto=thin we have relocation errors like:
# rust-lld: error: relocation R_X86_64_32S cannot be used against symbol 'SEED_encrypt'; recompile with -fPIC
#
# NOTE: -fno-pie disables -fPIC, so that is why we check ENABLE_THINLTO in the branch bellow
#
# For some sophisticated platforms we have different issues with fPIC:
# For example riscv toolchain itself compiled without fPIC
if (NOT ENABLE_THINLTO AND (ARCH_AMD64 OR ARCH_AARCH64))
    set(ENABLE_POSITION_INDEPENDENT_BINARY 1)
endif()

if (ENABLE_POSITION_INDEPENDENT_BINARY)
    set (CMAKE_POSITION_INDEPENDENT_CODE OFF)
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
    set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
endif()

if (NOT OS_ANDROID AND OS_LINUX AND NOT ARCH_S390X AND NOT SANITIZE AND NOT ENABLE_POSITION_INDEPENDENT_BINARY)
    # Using '-no-pie' builds executables with fixed addresses, resulting in slightly more efficient code
    # and keeping binary addresses constant even with ASLR enabled.
    # Disabled on Android as it requires PIE: https://source.android.com/docs/security/enhancements#android-5
    # Disabled on IBM S390X due to build issues with 'no-pie'
    # Disabled with sanitizers to avoid issues with maximum relocation size: https://github.com/hanzoai/datastore/pull/49145
    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 ()

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

enable_testing() # Enable for tests without binary

set(ENABLE_OPENSSL_DYNAMIC_DEFAULT OFF)
option(ENABLE_OPENSSL_DYNAMIC "This option removes SSL from Datastore and will link to the OpenSSL version supplied by OS." ${ENABLE_OPENSSL_DYNAMIC_DEFAULT})

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

message (STATUS "Building for: ${CMAKE_SYSTEM} ${CMAKE_SYSTEM_PROCESSOR} ${CMAKE_LIBRARY_ARCHITECTURE}")

# 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 TARGET)
    set_property (GLOBAL APPEND PROPERTY NATIVE_BUILD_TARGETS "--target" ${TARGET})
endfunction (add_native_target)

add_subdirectory (contrib EXCLUDE_FROM_ALL)

# We can only include XRay flags and defines once we know that we're building LLVM
if (ENABLE_XRAY)
    include (cmake/xray_instrumentation.cmake)
endif()

# Sets dummy launchers to suppress linking. Used for clang-tidy builds.
enable_dummy_launchers_if_needed()

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

macro (datastore_add_executable target)
    # invoke built-in add_executable
    # explicitly acquire and interpose malloc symbols by datastore_malloc
    # Note: for musl builds (-nostartfiles), the CRT startup files are added to every
    # executable through the link flags, see cmake/linux/default_libs.cmake.
    add_executable (${ARGV} $<TARGET_OBJECTS:datastore_malloc>)

    get_target_property (type ${target} TYPE)
    if (${type} STREQUAL EXECUTABLE)
        target_link_libraries (${target} PUBLIC datastore_new_delete)

        # 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 datastore 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 OS_DARWIN)
            set_property(TARGET ${target} APPEND PROPERTY LINK_OPTIONS -u_zone_register)
        endif()
    endif()
endmacro()

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)

    # With LTO Rust adds few symbols with global visibility, the most common is
    # rust_eh_personality. And this leads to linking errors because multiple
    # Rust libraries contains the same symbol.
    #
    # If it was shared library, that we could use version script for linker to
    # hide this symbols, but libraries are static.
    #
    # we could in theory compile everything to one library but this will be a
    # mess
    #
    # But this should be OK since CI has lots of other builds that are done
    # without LTO and it will find multiple definitions if there will be any.
    #
    # More information about this behaviour in Rust can be found here
    # - https://github.com/rust-lang/rust/issues/44322
    # - https://alanwu.space/post/symbol-hygiene/
    if (ENABLE_THINLTO)
        set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--allow-multiple-definition")
    endif()
endif()

if (CMAKE_BUILD_TYPE_UC STREQUAL "RELWITHDEBINFO"
    AND NOT SANITIZE AND NOT ENABLE_FUZZING
    AND OMIT_HEAVY_DEBUG_SYMBOLS AND OS_LINUX AND (ARCH_AMD64 OR ARCH_AARCH64))
    set(CHECK_LARGE_OBJECT_SIZES_DEFAULT ON)
else ()
    set(CHECK_LARGE_OBJECT_SIZES_DEFAULT OFF)
endif ()
option(CHECK_LARGE_OBJECT_SIZES "Check that there are no large object files after build." ${CHECK_LARGE_OBJECT_SIZES_DEFAULT})

add_subdirectory (base)
add_subdirectory (src)
if (LEXER_STANDALONE_BUILD)
    add_subdirectory(tests/lexer)
endif ()
add_subdirectory (programs)
add_subdirectory (utils)

if (FUZZER)
    # Bundle fuzzers target
    add_custom_target(fuzzers)
    # Instrument all targets fuzzer and link with libfuzzer
    get_all_targets(all_targets)
    foreach(target ${all_targets})
        # isa-l contrib uses the nasm compiler, which has no fsanitize options
        if (NOT(target STREQUAL "_fuzzer" OR target STREQUAL "_fuzzer_no_main" OR target MATCHES ".*isal.*"))
            get_target_property(target_type ${target} TYPE)
            if (NOT(target_type STREQUAL "INTERFACE_LIBRARY" OR target_type STREQUAL "UTILITY"))
                target_compile_options(${target} PRIVATE "-fsanitize=fuzzer-no-link")
            endif()
            if (target_type STREQUAL "EXECUTABLE" AND target MATCHES ".+_fuzzer")
                message(STATUS "${target} instrumented with fuzzer")
                target_link_libraries(${target} PUBLIC ch_contrib::fuzzer)
                # Add to fuzzers bundle
                add_dependencies(fuzzers ${target})
                get_target_filename(${target} target_bin_name)
                get_target_property(target_bin_dir ${target} BINARY_DIR)
                add_custom_command(TARGET fuzzers POST_BUILD COMMAND mv "${target_bin_dir}/${target_bin_name}" "${CMAKE_CURRENT_BINARY_DIR}/programs/" VERBATIM)
            endif()
        endif()
    endforeach()
    add_custom_command(TARGET fuzzers POST_BUILD COMMAND SRC=${CMAKE_SOURCE_DIR} BIN=${CMAKE_BINARY_DIR} OUT=${CMAKE_BINARY_DIR}/programs ${CMAKE_SOURCE_DIR}/tests/fuzz/build.sh VERBATIM)
endif()

include (cmake/sanitize_targets.cmake)

if (COMPILER_CACHE STREQUAL "chcache" AND CHCACHE_EXECUTABLE_PATH STREQUAL "")
    message(STATUS "Adding chcache as dependency to all other targets")
    get_all_targets(all_targets)
    set(chcache_targets _cargo-build_chcache cargo-build_chcache cargo-prebuild_chcache)

    foreach(target ${all_targets})
        if (target IN_LIST chcache_targets)
            continue()
        endif()

        add_dependencies(${target} cargo-build_chcache)
    endforeach()
endif()

# 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
        AND NOT USE_MUSL
    )
)
    message (STATUS "Building native targets: ${NATIVE_BUILD_TARGETS}")

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

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

    disable_dummy_launchers_if_needed()

    execute_process(
        COMMAND ${CMAKE_COMMAND}
            "-G${CMAKE_GENERATOR}"
            "-DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}"
            "-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}"
            "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
            "-DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER}"
            "-DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}"
            "-DCMAKE_BUILD_TYPE=Release"
            # Avoid overriding .cargo/config.toml with native toolchain.
            "-DENABLE_RUST=OFF"
            "-DENABLE_DATASTORE_SELF_EXTRACTING=${ENABLE_DATASTORE_SELF_EXTRACTING}"
            "-DUSE_BINARY_HASH=${USE_BINARY_HASH}"
        ${PROJECT_SOURCE_DIR}
        WORKING_DIRECTORY "${NATIVE_BUILD_DIR}"
        COMMAND_ECHO STDOUT
        COMMAND_ERROR_IS_FATAL ANY
    )

    enable_dummy_launchers_if_needed()

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