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+dnl @synopsis AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
+dnl
+dnl This macro compares two version strings. It is used heavily in the
+dnl macro _AX_PATH_BDB for library checking. Due to the various number
+dnl of minor-version numbers that can exist, and the fact that string
+dnl comparisons are not compatible with numeric comparisons, this is
+dnl not necessarily trivial to do in a autoconf script. This macro
+dnl makes doing these comparisons easy.
+dnl
+dnl The six basic comparisons are available, as well as checking
+dnl equality limited to a certain number of minor-version levels.
+dnl
+dnl The operator OP determines what type of comparison to do, and can
+dnl be one of:
+dnl
+dnl eq - equal (test A == B)
+dnl ne - not equal (test A != B)
+dnl le - less than or equal (test A <= B)
+dnl ge - greater than or equal (test A >= B)
+dnl lt - less than (test A < B)
+dnl gt - greater than (test A > B)
+dnl
+dnl Additionally, the eq and ne operator can have a number after it to
+dnl limit the test to that number of minor versions.
+dnl
+dnl eq0 - equal up to the length of the shorter version
+dnl ne0 - not equal up to the length of the shorter version
+dnl eqN - equal up to N sub-version levels
+dnl neN - not equal up to N sub-version levels
+dnl
+dnl When the condition is true, shell commands ACTION-IF-TRUE are run,
+dnl otherwise shell commands ACTION-IF-FALSE are run. The environment
+dnl variable 'ax_compare_version' is always set to either 'true' or
+dnl 'false' as well.
+dnl
+dnl Examples:
+dnl
+dnl AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
+dnl AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
+dnl
+dnl would both be true.
+dnl
+dnl AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
+dnl AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
+dnl
+dnl would both be false.
+dnl
+dnl AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
+dnl
+dnl would be true because it is only comparing two minor versions.
+dnl
+dnl AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
+dnl
+dnl would be true because it is only comparing the lesser number of
+dnl minor versions of the two values.
+dnl
+dnl Note: The characters that separate the version numbers do not
+dnl matter. An empty string is the same as version 0. OP is evaluated
+dnl by autoconf, not configure, so must be a string, not a variable.
+dnl
+dnl The author would like to acknowledge Guido Draheim whose advice
+dnl about the m4_case and m4_ifvaln functions make this macro only
+dnl include the portions necessary to perform the specific comparison
+dnl specified by the OP argument in the final configure script.
+dnl
+dnl @category Misc
+dnl @author Tim Toolan <toolan@ele.uri.edu>
+dnl @version 2004-03-01
+dnl @license GPLWithACException
+
+dnl #########################################################################
+AC_DEFUN([AX_COMPARE_VERSION], [
+ # Used to indicate true or false condition
+ ax_compare_version=false
+
+ # Convert the two version strings to be compared into a format that
+ # allows a simple string comparison. The end result is that a version
+ # string of the form 1.12.5-r617 will be converted to the form
+ # 0001001200050617. In other words, each number is zero padded to four
+ # digits, and non digits are removed.
+ AS_VAR_PUSHDEF([A],[ax_compare_version_A])
+ A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+ -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+ -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+ -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+ -e 's/[[^0-9]]//g'`
+
+ AS_VAR_PUSHDEF([B],[ax_compare_version_B])
+ B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+ -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+ -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+ -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+ -e 's/[[^0-9]]//g'`
+
+ dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
+ dnl # then the first line is used to determine if the condition is true.
+ dnl # The sed right after the echo is to remove any indented white space.
+ m4_case(m4_tolower($2),
+ [lt],[
+ ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+ ],
+ [gt],[
+ ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+ ],
+ [le],[
+ ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+ ],
+ [ge],[
+ ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+ ],[
+ dnl Split the operator from the subversion count if present.
+ m4_bmatch(m4_substr($2,2),
+ [0],[
+ # A count of zero means use the length of the shorter version.
+ # Determine the number of characters in A and B.
+ ax_compare_version_len_A=`echo "$A" | awk '{print(length)}'`
+ ax_compare_version_len_B=`echo "$B" | awk '{print(length)}'`
+
+ # Set A to no more than B's length and B to no more than A's length.
+ A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
+ B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
+ ],
+ [[0-9]+],[
+ # A count greater than zero means use only that many subversions
+ A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+ B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+ ],
+ [.+],[
+ AC_WARNING(
+ [illegal OP numeric parameter: $2])
+ ],[])
+
+ # Pad zeros at end of numbers to make same length.
+ ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
+ B="$B`echo $A | sed 's/./0/g'`"
+ A="$ax_compare_version_tmp_A"
+
+ # Check for equality or inequality as necessary.
+ m4_case(m4_tolower(m4_substr($2,0,2)),
+ [eq],[
+ test "x$A" = "x$B" && ax_compare_version=true
+ ],
+ [ne],[
+ test "x$A" != "x$B" && ax_compare_version=true
+ ],[
+ AC_WARNING([illegal OP parameter: $2])
+ ])
+ ])
+
+ AS_VAR_POPDEF([A])dnl
+ AS_VAR_POPDEF([B])dnl
+
+ dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
+ if test "$ax_compare_version" = "true" ; then
+ m4_ifvaln([$4],[$4],[:])dnl
+ m4_ifvaln([$5],[else $5])dnl
+ fi
+]) dnl AX_COMPARE_VERSION