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1899
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1 dnl @synopsis AC_COMPARE_VERSION\
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2 dnl (version-a, version-b, action-if-greater, action-if-equal, action-if-less)
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3 dnl
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4 dnl This macro compares two version numbers and executes the indicated action
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5 dnl based on whether they're equal or one is greater than the other.
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6 dnl It's needed to determine whether ocaml is new enough that the incompatible
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7 dnl change 'loc' -> '_loc' is present in this version of camlp4.
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8 dnl
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9 dnl It's implemented from scratch just for SWIG by arty.
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10 dnl
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11 dnl @category Misc
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12 dnl @author arty
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13 dnl @version 2006-11-02
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14 dnl @license GPLWithACException
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15
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16 AC_DEFUN([AC_COMPARE_VERSION], [
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17 # Split the version into units.
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18 ver_a="[$1]"
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19 ver_b="[$2]"
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20 nodots_a=`echo $ver_a | sed -e 's/\./ /g'`
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21 condition="equal"
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22 isolate_b_regex='\([[0-9]]\+\).*'
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23 for ver_part in $nodots_a ; do
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24 b_ver_part=`echo "$ver_b" | sed -e 's/'"$isolate_b_regex"'/\1/'`
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25 if test \( "$ver_part" -lt "$b_ver_part" \) -a \( "x$condition" = "xequal" \) ; then
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26 condition=less
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27 elif test \( "$ver_part" -gt "$b_ver_part" \) -a \( "x$condition" = "xequal" \) ; then
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28 condition=greater
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29 fi
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30 isolate_b_regex='[[0-9]]\+\.'"$isolate_b_regex"
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31 done
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32
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33 if test "x$condition" = "xequal" ; then
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34 [$4]
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35 elif test "x$condition" = "xless" ; then
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36 [$3]
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37 elif test "x$condition" = "xgreater" ; then
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38 [$5]
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39 fi
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40 ])
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