ClickHouse/cmake/find_zlib.cmake

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CMake
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option (USE_INTERNAL_ZLIB_LIBRARY "Set to FALSE to use system zlib library instead of bundled" ${NOT_UNBUNDLED})
if (NOT USE_INTERNAL_ZLIB_LIBRARY)
find_package (ZLIB)
endif ()
if (NOT ZLIB_FOUND)
set (USE_INTERNAL_ZLIB_LIBRARY 1)
set (ZLIB_COMPAT 1) # for zlib-ng, also enables WITH_GZFILEOP
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set (WITH_NATIVE_INSTRUCTIONS ${ARCHNATIVE})
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if (ARCH_FREEBSD OR ARCH_I386)
set (WITH_OPTIM 0 CACHE INTERNAL "") # Bug in assembler
endif ()
if (ARCH_AARCH64)
set(WITH_NEON 1 CACHE INTERNAL "")
set(WITH_ACLE 1 CACHE INTERNAL "")
endif ()
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set (ZLIB_INCLUDE_DIR "${ClickHouse_SOURCE_DIR}/contrib/zlib-ng" "${ClickHouse_BINARY_DIR}/contrib/zlib-ng") # generated zconf.h
set (ZLIB_INCLUDE_DIRS ${ZLIB_INCLUDE_DIR}) # for poco
set (ZLIB_FOUND 1) # for poco
if (USE_STATIC_LIBRARIES)
set (ZLIB_LIBRARIES zlibstatic)
else ()
set (ZLIB_LIBRARIES zlib)
endif ()
endif ()
message (STATUS "Using zlib: ${ZLIB_INCLUDE_DIR} : ${ZLIB_LIBRARIES}")