cpp/cmake/ZLIBDependency.cmake

#[[
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to you under the Apache License, Version 2.0 (the
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    https://www.apache.org/licenses/LICENSE-2.0

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set(TSFILE_ZLIB_MIN_VERSION "1.3.1")
set(TSFILE_ZLIB_BUNDLED_VERSION "1.3.1")
set(TSFILE_ZLIB_NEXT_INCOMPATIBLE_VERSION "2.0.0")
set(_TSFILE_SYSTEM_ZLIB_FOUND FALSE)

if (NOT TSFILE_DEPENDENCY_SOURCE STREQUAL "BUNDLED")
    find_package(ZLIB QUIET)
    if (ZLIB_VERSION)
        set(_TSFILE_SYSTEM_ZLIB_VERSION "${ZLIB_VERSION}")
    else ()
        set(_TSFILE_SYSTEM_ZLIB_VERSION "${ZLIB_VERSION_STRING}")
    endif ()

    if (ZLIB_FOUND AND TARGET ZLIB::ZLIB AND
            NOT "${_TSFILE_SYSTEM_ZLIB_VERSION}" STREQUAL "" AND
            NOT _TSFILE_SYSTEM_ZLIB_VERSION VERSION_LESS
                    TSFILE_ZLIB_MIN_VERSION AND
            _TSFILE_SYSTEM_ZLIB_VERSION VERSION_LESS
                    TSFILE_ZLIB_NEXT_INCOMPATIBLE_VERSION)
        set(_TSFILE_SYSTEM_ZLIB_FOUND TRUE)
        message(STATUS
                "Found compatible system zlib ${_TSFILE_SYSTEM_ZLIB_VERSION}")
    elseif (ZLIB_FOUND)
        message(STATUS
                "Ignoring incompatible system zlib "
                "${_TSFILE_SYSTEM_ZLIB_VERSION}; TsFile requires "
                ">=${TSFILE_ZLIB_MIN_VERSION} and "
                "<${TSFILE_ZLIB_NEXT_INCOMPATIBLE_VERSION}")
    endif ()
endif ()

tsfile_resolve_dependency_source(
        "zlib" "${_TSFILE_SYSTEM_ZLIB_FOUND}" TSFILE_ZLIB_SOURCE)

unset(_TSFILE_SYSTEM_ZLIB_FOUND)
unset(_TSFILE_SYSTEM_ZLIB_VERSION)