ClickHouse/cmake/find/re2.cmake

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CMake
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option (USE_INTERNAL_RE2_LIBRARY "Set to FALSE to use system re2 library instead of bundled [slower]" ON)
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if(NOT EXISTS "${ClickHouse_SOURCE_DIR}/contrib/re2/re2")
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if(USE_INTERNAL_RE2_LIBRARY)
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message(WARNING "submodule contrib/re2 is missing. to fix try run: \n git submodule update --init")
message (${RECONFIGURE_MESSAGE_LEVEL} "Can't find internal re2 library")
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endif()
set(USE_INTERNAL_RE2_LIBRARY 0)
set(MISSING_INTERNAL_RE2_LIBRARY 1)
endif()
if (NOT USE_INTERNAL_RE2_LIBRARY)
find_library (RE2_LIBRARY re2)
find_path (RE2_INCLUDE_DIR NAMES re2/re2.h PATHS ${RE2_INCLUDE_PATHS})
if (NOT RE2_LIBRARY OR NOT RE2_INCLUDE_DIR)
message (${RECONFIGURE_MESSAGE_LEVEL} "Can't find system re2 library")
endif ()
endif ()
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string(FIND ${CMAKE_CURRENT_BINARY_DIR} " " _have_space)
if(_have_space GREATER 0)
message(WARNING "Using spaces in build path [${CMAKE_CURRENT_BINARY_DIR}] highly not recommended. Library re2st will be disabled.")
set (MISSING_INTERNAL_RE2_ST_LIBRARY 1)
endif()
if (RE2_LIBRARY AND RE2_INCLUDE_DIR)
set (RE2_ST_LIBRARY ${RE2_LIBRARY})
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elseif (NOT MISSING_INTERNAL_RE2_LIBRARY)
set (USE_INTERNAL_RE2_LIBRARY 1)
set (RE2_LIBRARY re2)
set (RE2_INCLUDE_DIR "${ClickHouse_SOURCE_DIR}/contrib/re2")
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if (NOT MISSING_INTERNAL_RE2_ST_LIBRARY)
set (RE2_ST_LIBRARY re2_st)
set (USE_RE2_ST 1)
else ()
set (RE2_ST_LIBRARY ${RE2_LIBRARY})
message (${RECONFIGURE_MESSAGE_LEVEL} "Using internal re2 library instead of re2_st")
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endif ()
endif ()
message (STATUS "Using re2: ${RE2_INCLUDE_DIR} : ${RE2_LIBRARY}; ${RE2_ST_INCLUDE_DIR} : ${RE2_ST_LIBRARY}")