option (ENABLE_ROCKSDB "Enable RocksDB" ${ENABLE_LIBRARIES})

if (NOT ENABLE_ROCKSDB)
  message (STATUS "Not using RocksDB")
  return()
endif()

# not in original build system, otherwise xxHash.cc fails to compile with ClickHouse C++23 default
set (CMAKE_CXX_STANDARD 20)

# Always disable jemalloc for rocksdb by default because it introduces non-standard jemalloc APIs
option(WITH_JEMALLOC "build with JeMalloc" OFF)

option(WITH_LIBURING "build with liburing" OFF) # TODO could try to enable this conditionally, depending on ClickHouse's ENABLE_LIBURING

# ClickHouse cannot be compiled without snappy, lz4, zlib, zstd
option(WITH_SNAPPY "build with SNAPPY" ON)
option(WITH_LZ4 "build with lz4" ON)
option(WITH_ZLIB "build with zlib" ON)
option(WITH_ZSTD "build with zstd" ON)

if(WITH_SNAPPY)
  add_definitions(-DSNAPPY)
  list(APPEND THIRDPARTY_LIBS ch_contrib::snappy)
endif()

if(WITH_ZLIB)
  add_definitions(-DZLIB)
  list(APPEND THIRDPARTY_LIBS ch_contrib::zlib)
endif()

if(WITH_LZ4)
  add_definitions(-DLZ4)
  list(APPEND THIRDPARTY_LIBS ch_contrib::lz4)
endif()

if(WITH_ZSTD)
  add_definitions(-DZSTD)
  list(APPEND THIRDPARTY_LIBS ch_contrib::zstd)
endif()

add_definitions(-DROCKSDB_PORTABLE)

if(ENABLE_SSE42 AND ENABLE_PCLMULQDQ)
  add_definitions(-DHAVE_SSE42)
  add_definitions(-DHAVE_PCLMUL)
endif()

if(CMAKE_SYSTEM_PROCESSOR MATCHES "arm64|aarch64|AARCH64")
  set (HAS_ARMV8_CRC 1)
  # the original build descriptions set specific flags for ARM. These flags are already subsumed by ClickHouse's general
  # ARM flags, see cmake/cpu_features.cmake
  # set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv8-a+crc+crypto -Wno-unused-function")
  # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv8-a+crc+crypto -Wno-unused-function")
endif()

if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
  add_definitions(-DOS_MACOSX)
elseif(CMAKE_SYSTEM_NAME MATCHES "Linux")
  add_definitions(-DOS_LINUX)
elseif(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
  add_definitions(-DOS_FREEBSD)
elseif(CMAKE_SYSTEM_NAME MATCHES "Android")
  add_definitions(-DOS_ANDROID)
endif()

add_definitions(-DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX)

if ((OS_LINUX OR OS_FREEBSD) AND NOT USE_MUSL)
  add_definitions(-DROCKSDB_PTHREAD_ADAPTIVE_MUTEX)
endif()

if (OS_LINUX)
  add_definitions(-DROCKSDB_SCHED_GETCPU_PRESENT)
  add_definitions(-DROCKSDB_AUXV_GETAUXVAL_PRESENT)
endif()

set(ROCKSDB_SOURCE_DIR "${ClickHouse_SOURCE_DIR}/contrib/rocksdb")

include_directories(${ROCKSDB_SOURCE_DIR})
include_directories("${ROCKSDB_SOURCE_DIR}/include")

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    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/write_prepared_txn_db.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/write_unprepared_txn.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/write_unprepared_txn_db.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/ttl/db_ttl_impl.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/wal_filter.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/write_batch_with_index/write_batch_with_index.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/write_batch_with_index/write_batch_with_index_internal.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/concurrent_tree.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/lock_request.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/locktree.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/manager.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/range_buffer.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/treenode.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/txnid_set.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/locktree/wfg.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/standalone_port.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/util/dbt.cc
    ${ROCKSDB_SOURCE_DIR}/utilities/transactions/lock/range/range_tree/lib/util/memarena.cc
    build_version.cc) # generated by hand

if(ENABLE_SSE42 AND ENABLE_PCLMULQDQ)
  set_source_files_properties(
    "${ROCKSDB_SOURCE_DIR}/util/crc32c.cc"
    PROPERTIES COMPILE_FLAGS "-msse4.2 -mpclmul")
endif()

if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64")
  list(APPEND SOURCES
    "${ROCKSDB_SOURCE_DIR}/util/crc32c_ppc.c"
    "${ROCKSDB_SOURCE_DIR}/util/crc32c_ppc_asm.S")
endif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64")

if(HAS_ARMV8_CRC)
  list(APPEND SOURCES
    "${ROCKSDB_SOURCE_DIR}/util/crc32c_arm64.cc")
endif(HAS_ARMV8_CRC)

list(APPEND SOURCES
    "${ROCKSDB_SOURCE_DIR}/port/port_posix.cc"
    "${ROCKSDB_SOURCE_DIR}/env/env_posix.cc"
    "${ROCKSDB_SOURCE_DIR}/env/fs_posix.cc"
    "${ROCKSDB_SOURCE_DIR}/env/io_posix.cc")

add_library(_rocksdb ${SOURCES})
add_library(ch_contrib::rocksdb ALIAS _rocksdb)
target_link_libraries(_rocksdb PRIVATE ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})

# SYSTEM is required to overcome some issues
target_include_directories(_rocksdb SYSTEM BEFORE INTERFACE "${ROCKSDB_SOURCE_DIR}/include")