ClickHouse/cmake/find_rdkafka.cmake

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CMake
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option (ENABLE_RDKAFKA "Enable kafka" ON)
if (ENABLE_RDKAFKA)
option (USE_INTERNAL_RDKAFKA_LIBRARY "Set to FALSE to use system librdkafka instead of the bundled" ${NOT_UNBUNDLED})
if (USE_INTERNAL_RDKAFKA_LIBRARY AND NOT EXISTS "${ClickHouse_SOURCE_DIR}/contrib/librdkafka/CMakeLists.txt")
message (WARNING "submodule contrib/librdkafka is missing. to fix try run: \n git submodule update --init --recursive")
set (USE_INTERNAL_RDKAFKA_LIBRARY 0)
set (MISSING_INTERNAL_RDKAFKA_LIBRARY 1)
endif ()
if (NOT USE_INTERNAL_RDKAFKA_LIBRARY)
find_library (RDKAFKA_LIB rdkafka)
find_path (RDKAFKA_INCLUDE_DIR NAMES librdkafka/rdkafka.h PATHS ${RDKAFKA_INCLUDE_PATHS})
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if (USE_STATIC_LIBRARIES AND NOT OS_FREEBSD)
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find_library (SASL2_LIBRARY sasl2)
endif ()
endif ()
if (RDKAFKA_LIB AND RDKAFKA_INCLUDE_DIR)
set (USE_RDKAFKA 1)
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set (RDKAFKA_LIBRARY ${RDKAFKA_LIB} ${OPENSSL_LIBRARIES})
if (SASL2_LIBRARY)
list (APPEND RDKAFKA_LIBRARY ${SASL2_LIBRARY})
endif ()
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if (LZ4_LIBRARY)
list (APPEND RDKAFKA_LIBRARY ${LZ4_LIBRARY})
endif ()
elseif (NOT MISSING_INTERNAL_RDKAFKA_LIBRARY)
set (USE_INTERNAL_RDKAFKA_LIBRARY 1)
set (RDKAFKA_INCLUDE_DIR "${ClickHouse_SOURCE_DIR}/contrib/librdkafka/src")
set (RDKAFKA_LIBRARY rdkafka)
set (USE_RDKAFKA 1)
endif ()
endif ()
message (STATUS "Using librdkafka=${USE_RDKAFKA}: ${RDKAFKA_INCLUDE_DIR} : ${RDKAFKA_LIBRARY}")