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@@ -175,3 +175,182 @@ AC_SUBST(LTCOMPILE)
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+# ===========================================================================
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+# http://autoconf-archive.cryp.to/ax_compare_version.html
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+# ===========================================================================
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+# AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
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+# This macro compares two version strings. Due to the various number of
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+# minor-version numbers that can exist, and the fact that string
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+# comparisons are not compatible with numeric comparisons, this is not
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+# necessarily trivial to do in a autoconf script. This macro makes doing
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+# these comparisons easy.
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+# The six basic comparisons are available, as well as checking equality
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+# limited to a certain number of minor-version levels.
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+# The operator OP determines what type of comparison to do, and can be one
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+# eq - equal (test A == B)
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+# ne - not equal (test A != B)
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+# le - less than or equal (test A <= B)
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+# ge - greater than or equal (test A >= B)
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+# lt - less than (test A < B)
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+# gt - greater than (test A > B)
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+# Additionally, the eq and ne operator can have a number after it to limit
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+# the test to that number of minor versions.
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+# eq0 - equal up to the length of the shorter version
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+# ne0 - not equal up to the length of the shorter version
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+# eqN - equal up to N sub-version levels
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+# neN - not equal up to N sub-version levels
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+# When the condition is true, shell commands ACTION-IF-TRUE are run,
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+# otherwise shell commands ACTION-IF-FALSE are run. The environment
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+# variable 'ax_compare_version' is always set to either 'true' or 'false'
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+# AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
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+# AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
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+# AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
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+# AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
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+# AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
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+# would be true because it is only comparing two minor versions.
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+# AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
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+# would be true because it is only comparing the lesser number of minor
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+# versions of the two values.
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+# Note: The characters that separate the version numbers do not matter. An
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+# empty string is the same as version 0. OP is evaluated by autoconf, not
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+# configure, so must be a string, not a variable.
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+# The author would like to acknowledge Guido Draheim whose advice about
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+# the m4_case and m4_ifvaln functions make this macro only include the
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+# portions necessary to perform the specific comparison specified by the
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+# OP argument in the final configure script.
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+# Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
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+# Copying and distribution of this file, with or without modification, are
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+# permitted in any medium without royalty provided the copyright notice
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+# and this notice are preserved.
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+dnl #########################################################################
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+AC_DEFUN([AX_COMPARE_VERSION], [
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+ # Used to indicate true or false condition
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+ ax_compare_version=false
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+ # Convert the two version strings to be compared into a format that
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+ # allows a simple string comparison. The end result is that a version
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+ # string of the form 1.12.5-r617 will be converted to the form
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+ # 0001001200050617. In other words, each number is zero padded to four
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+ # digits, and non digits are removed.
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+ AS_VAR_PUSHDEF([A],[ax_compare_version_A])
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+ A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
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+ -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
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+ -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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+ -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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+ AS_VAR_PUSHDEF([B],[ax_compare_version_B])
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+ B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
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+ -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
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+ -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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+ -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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+ dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
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+ dnl # then the first line is used to determine if the condition is true.
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+ dnl # The sed right after the echo is to remove any indented white space.
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+ m4_case(m4_tolower($2),
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+ ax_compare_version=`echo "x$A
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+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
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+ ax_compare_version=`echo "x$A
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+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
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+ ax_compare_version=`echo "x$A
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+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
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+ ax_compare_version=`echo "x$A
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+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
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+ dnl Split the operator from the subversion count if present.
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+ m4_bmatch(m4_substr($2,2),
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+ # A count of zero means use the length of the shorter version.
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+ # Determine the number of characters in A and B.
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+ ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
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+ ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
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+ # Set A to no more than B's length and B to no more than A's length.
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+ A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
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+ B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
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+ # A count greater than zero means use only that many subversions
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+ A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
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+ B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
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+ [illegal OP numeric parameter: $2])
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+ # Pad zeros at end of numbers to make same length.
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+ ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
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+ B="$B`echo $A | sed 's/./0/g'`"
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+ A="$ax_compare_version_tmp_A"
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+ # Check for equality or inequality as necessary.
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+ m4_case(m4_tolower(m4_substr($2,0,2)),
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+ test "x$A" = "x$B" && ax_compare_version=true
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+ test "x$A" != "x$B" && ax_compare_version=true
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+ AC_WARNING([illegal OP parameter: $2])
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+ dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
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+ if test "$ax_compare_version" = "true" ; then
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+ m4_ifvaln([$4],[$4],[:])dnl
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+ m4_ifvaln([$5],[else $5])dnl
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+]) dnl AX_COMPARE_VERSION
) is private.
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