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| {{CMake/Template/Obsolete}} | | {{CMake/Template/Moved}} |
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| Please see the '''VERSION_LESS''', '''VERSION_EQUAL''', and '''VERSION_GREATER''' options to the IF() command.
| | This page has moved [https://gitlab.kitware.com/cmake/community/wikis/contrib/macros/CompareVersionStrings here]. |
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| ----
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| I needed a way to compare two version strings to make sure that I had a version of a package that was sufficient for my needs. The first go around I used regular expressions to pull out all the dot versions, create a number, and finally compare the number.
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| <pre>
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| SET(THREE_PART_VERSION_REGEX "[0-9]+\\.[0-9]+\\.[0-9]+")
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| # Breaks up a string in the form n1.n2.n3 into three parts and stores
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| # them in major, minor, and patch. version should be a value, not a
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| # variable, while major, minor and patch should be variables.
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| MACRO(THREE_PART_VERSION_TO_VARS version major minor patch)
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| IF(${version} MATCHES ${THREE_PART_VERSION_REGEX})
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| STRING(REGEX REPLACE "^([0-9]+)\\.[0-9]+\\.[0-9]+" "\\1" ${major} "${version}")
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| STRING(REGEX REPLACE "^[0-9]+\\.([0-9])+\\.[0-9]+" "\\1" ${minor} "${version}")
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| STRING(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+)" "\\1" ${patch} "${version}")
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| ELSE(${version} MATCHES ${THREE_PART_VERSION_REGEX})
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| MESSAGE("MACRO(THREE_PART_VERSION_TO_VARS ${version} ${major} ${minor} ${patch}")
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| MESSAGE(FATAL_ERROR "Problem parsing version string, I can't parse it properly.")
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| ENDIF(${version} MATCHES ${THREE_PART_VERSION_REGEX})
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| ENDMACRO(THREE_PART_VERSION_TO_VARS)
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| THREE_PART_VERSION_TO_VARS(${version-string} major_vers minor_vers patch_vers)
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| MESSAGE("version = ${major_vers}.${minor_vers}.${patch_vers}")
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| # Compute a version number
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| MATH(EXPR version_number "${major_vers} * 1000000 + ${minor_vers} * 1000 + ${patch_vers}" )
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| MESSAGE("version_number = ${version_number}")
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| </pre>
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| This was somewhat cumbersome, and was hard coded for three dot versions (x.y.z). I wanted to be able to use a single macro for version strings with 1 to any number of dot versions. In addition I wanted to be able to compare version strings with different number of dot versions (i.e. 0.99.1 and 0.99.1.2).
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| <pre>
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| # Computes the realtionship between two version strings. A version
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| # string is a number delineated by '.'s such as 1.3.2 and 0.99.9.1.
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| # You can feed version strings with different number of dot versions,
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| # and the shorter version number will be padded with zeros: 9.2 <
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| # 9.2.1 will actually compare 9.2.0 < 9.2.1.
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| #
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| # Input: a_in - value, not variable
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| # b_in - value, not variable
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| # result_out - variable with value:
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| # -1 : a_in < b_in
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| # 0 : a_in == b_in
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| # 1 : a_in > b_in
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| #
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| # Written by James Bigler.
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| MACRO(COMPARE_VERSION_STRINGS a_in b_in result_out)
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| # Since SEPARATE_ARGUMENTS using ' ' as the separation token,
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| # replace '.' with ' ' to allow easy tokenization of the string.
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| STRING(REPLACE "." " " a ${a_in})
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| STRING(REPLACE "." " " b ${b_in})
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| SEPARATE_ARGUMENTS(a)
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| SEPARATE_ARGUMENTS(b)
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| # Check the size of each list to see if they are equal.
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| LIST(LENGTH a a_length)
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| LIST(LENGTH b b_length)
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| # Pad the shorter list with zeros.
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| # Note that range needs to be one less than the length as the for
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| # loop is inclusive (silly CMake).
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| IF(a_length LESS b_length)
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| # a is shorter
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| SET(shorter a)
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| MATH(EXPR range "${b_length} - 1")
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| MATH(EXPR pad_range "${b_length} - ${a_length} - 1")
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| ELSE(a_length LESS b_length)
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| # b is shorter
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| SET(shorter b)
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| MATH(EXPR range "${a_length} - 1")
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| MATH(EXPR pad_range "${a_length} - ${b_length} - 1")
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| ENDIF(a_length LESS b_length)
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| # PAD out if we need to
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| IF(NOT pad_range LESS 0)
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| FOREACH(pad RANGE ${pad_range})
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| # Since shorter is an alias for b, we need to get to it by by dereferencing shorter.
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| LIST(APPEND ${shorter} 0)
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| ENDFOREACH(pad RANGE ${pad_range})
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| ENDIF(NOT pad_range LESS 0)
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| SET(result 0)
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| FOREACH(index RANGE ${range})
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| IF(result EQUAL 0)
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| # Only continue to compare things as long as they are equal
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| LIST(GET a ${index} a_version)
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| LIST(GET b ${index} b_version)
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| # LESS
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| IF(a_version LESS b_version)
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| SET(result -1)
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| ENDIF(a_version LESS b_version)
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| # GREATER
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| IF(a_version GREATER b_version)
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| SET(result 1)
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| ENDIF(a_version GREATER b_version)
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| ENDIF(result EQUAL 0)
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| ENDFOREACH(index)
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| # Copy out the return result
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| SET(${result_out} ${result})
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| ENDMACRO(COMPARE_VERSION_STRINGS)
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| </pre>
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| I tested it with the following input:
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| <pre>
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| # a and b need to be passed in by value
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| MACRO(COMPARE_VERSION a b)
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| COMPARE_VERSION_STRINGS(${a} ${b} result)
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| IF(result LESS 0)
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| MESSAGE("${a} < ${b}")
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| ELSE(result LESS 0)
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| IF(result GREATER 0)
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| MESSAGE("${a} > ${b}")
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| ELSE(result GREATER 0)
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| MESSAGE("${a} == ${b}")
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| ENDIF(result GREATER 0)
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| ENDIF(result LESS 0)
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| ENDMACRO(COMPARE_VERSION)
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| SET(version-string "1.3.31")
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| COMPARE_VERSION(${version-string} "1.3.30")
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| COMPARE_VERSION(${version-string} "1.3.31")
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| COMPARE_VERSION(${version-string} "1.3.32")
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| COMPARE_VERSION(${version-string} "1.2.32")
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| COMPARE_VERSION(${version-string} "1.10.1")
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| COMPARE_VERSION("9.2" "9.1")
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| COMPARE_VERSION("9.2" "9.2")
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| COMPARE_VERSION("9.2" "9.3")
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| COMPARE_VERSION("9.1" "9.2")
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| COMPARE_VERSION("9.2" "9.2")
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| COMPARE_VERSION("9.3" "9.2")
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| COMPARE_VERSION("9.10" "9.2")
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| COMPARE_VERSION("9.2" "9.10")
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| COMPARE_VERSION("0.92.1.0" "0.92.1.1")
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| COMPARE_VERSION("0.92.1.1" "0.92.1.1")
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| COMPARE_VERSION("0.92.1.2" "0.92.1.1")
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| COMPARE_VERSION("0.92.1.2" "0.99.1.1")
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| COMPARE_VERSION("0.99.1.2" "0.92.1.1")
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| COMPARE_VERSION("0.92.1.2" "0.99.1")
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| COMPARE_VERSION("0.99.1" "0.92.1.1")
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| COMPARE_VERSION("0.99.1.2" "0.99.1")
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| COMPARE_VERSION("0.99.1" "0.99.1.1")
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| COMPARE_VERSION( "1" "10")
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| COMPARE_VERSION("10" "1")
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| </pre>
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| Here's the output:
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| <pre>
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| 1.3.31 > 1.3.30
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| 1.3.31 == 1.3.31
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| 1.3.31 < 1.3.32
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| 1.3.31 > 1.2.32 (note this is 1.2 not 1.3)
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| 1.3.31 < 1.10.1
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| 9.2 > 9.1
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| 9.2 == 9.2
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| 9.2 < 9.3
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| 9.1 < 9.2
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| 9.2 == 9.2
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| 9.3 > 9.2
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| 9.10 > 9.2
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| 9.2 < 9.10
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| 0.92.1.0 < 0.92.1.1
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| 0.92.1.1 == 0.92.1.1
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| 0.92.1.2 > 0.92.1.1
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| 0.92.1.2 < 0.99.1.1
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| 0.99.1.2 > 0.92.1.1
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| 0.92.1.2 < 0.99.1
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| 0.99.1 > 0.92.1.1
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| 0.99.1.2 > 0.99.1
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| 0.99.1 < 0.99.1.1
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| 1 < 10
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| 10 > 1
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| </pre>
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| [[Category:CMakeMacro]]
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