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36 lines
1.8 KiB
36 lines
1.8 KiB
# This macro compares version numbers of the form "x.y.z"
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# MACRO_ENSURE_VERSION( FOO_MIN_VERSION FOO_VERSION_FOUND FOO_VERSION_OK)
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# will set FOO_VERSIN_OK to true if FOO_VERSION_FOUND >= FOO_MIN_VERSION
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# where both have to be in a 3-part-version format, leading and trailing
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# text is ok, e.g.
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# MACRO_ENSURE_VERSION( "2.5.31" "flex 2.5.4a" VERSION_OK)
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# which means 2.5.31 is required and "flex 2.5.4a" is what was found on the system
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# Copyright (c) 2006, David Faure, <faure@kde.org>
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#
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# Redistribution and use is allowed according to the terms of the BSD license.
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# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
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MACRO(MACRO_ENSURE_VERSION requested_version found_version var_too_old)
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# parse the parts of the version string
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STRING(REGEX REPLACE "([0-9]+)\\.[0-9]+\\.[0-9]+" "\\1" req_major_vers "${requested_version}")
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STRING(REGEX REPLACE "[0-9]+\\.([0-9]+)\\.[0-9]+" "\\1" req_minor_vers "${requested_version}")
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STRING(REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+)" "\\1" req_patch_vers "${requested_version}")
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STRING(REGEX REPLACE "[^0-9]*([0-9]+)\\.[0-9]+\\.[0-9]+.*" "\\1" found_major_vers "${found_version}")
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STRING(REGEX REPLACE "[^0-9]*[0-9]+\\.([0-9]+)\\.[0-9]+.*" "\\1" found_minor_vers "${found_version}")
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STRING(REGEX REPLACE "[^0-9]*[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" found_patch_vers "${found_version}")
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# compute an overall version number which can be compared at once
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MATH(EXPR req_vers_num "${req_major_vers}*10000 + ${req_minor_vers}*100 + ${req_patch_vers}")
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MATH(EXPR found_vers_num "${found_major_vers}*10000 + ${found_minor_vers}*100 + ${found_patch_vers}")
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if (found_vers_num LESS req_vers_num)
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set( ${var_too_old} FALSE )
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else (found_vers_num LESS req_vers_num)
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set( ${var_too_old} TRUE )
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endif (found_vers_num LESS req_vers_num)
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ENDMACRO(MACRO_ENSURE_VERSION)
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