1# SPDX-License-Identifier: FSFAP 2# =========================================================================== 3# http://www.gnu.org/software/autoconf-archive/ax_compare_version.html 4# =========================================================================== 5# 6# SYNOPSIS 7# 8# AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE]) 9# 10# DESCRIPTION 11# 12# This macro compares two version strings. Due to the various number of 13# minor-version numbers that can exist, and the fact that string 14# comparisons are not compatible with numeric comparisons, this is not 15# necessarily trivial to do in a autoconf script. This macro makes doing 16# these comparisons easy. 17# 18# The six basic comparisons are available, as well as checking equality 19# limited to a certain number of minor-version levels. 20# 21# The operator OP determines what type of comparison to do, and can be one 22# of: 23# 24# eq - equal (test A == B) 25# ne - not equal (test A != B) 26# le - less than or equal (test A <= B) 27# ge - greater than or equal (test A >= B) 28# lt - less than (test A < B) 29# gt - greater than (test A > B) 30# 31# Additionally, the eq and ne operator can have a number after it to limit 32# the test to that number of minor versions. 33# 34# eq0 - equal up to the length of the shorter version 35# ne0 - not equal up to the length of the shorter version 36# eqN - equal up to N sub-version levels 37# neN - not equal up to N sub-version levels 38# 39# When the condition is true, shell commands ACTION-IF-TRUE are run, 40# otherwise shell commands ACTION-IF-FALSE are run. The environment 41# variable 'ax_compare_version' is always set to either 'true' or 'false' 42# as well. 43# 44# Examples: 45# 46# AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8]) 47# AX_COMPARE_VERSION([3.15],[lt],[3.15.8]) 48# 49# would both be true. 50# 51# AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8]) 52# AX_COMPARE_VERSION([3.15],[gt],[3.15.8]) 53# 54# would both be false. 55# 56# AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8]) 57# 58# would be true because it is only comparing two minor versions. 59# 60# AX_COMPARE_VERSION([3.15.7],[eq0],[3.15]) 61# 62# would be true because it is only comparing the lesser number of minor 63# versions of the two values. 64# 65# Note: The characters that separate the version numbers do not matter. An 66# empty string is the same as version 0. OP is evaluated by autoconf, not 67# configure, so must be a string, not a variable. 68# 69# The author would like to acknowledge Guido Draheim whose advice about 70# the m4_case and m4_ifvaln functions make this macro only include the 71# portions necessary to perform the specific comparison specified by the 72# OP argument in the final configure script. 73# 74# LICENSE 75# 76# Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu> 77# 78# Copying and distribution of this file, with or without modification, are 79# permitted in any medium without royalty provided the copyright notice 80# and this notice are preserved. This file is offered as-is, without any 81# warranty. 82 83#serial 11 84 85dnl ######################################################################### 86AC_DEFUN([AX_COMPARE_VERSION], [ 87 AC_REQUIRE([AC_PROG_AWK]) 88 89 # Used to indicate true or false condition 90 ax_compare_version=false 91 92 # Convert the two version strings to be compared into a format that 93 # allows a simple string comparison. The end result is that a version 94 # string of the form 1.12.5-r617 will be converted to the form 95 # 0001001200050617. In other words, each number is zero padded to four 96 # digits, and non digits are removed. 97 AS_VAR_PUSHDEF([A],[ax_compare_version_A]) 98 A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \ 99 -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \ 100 -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \ 101 -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \ 102 -e 's/[[^0-9]]//g'` 103 104 AS_VAR_PUSHDEF([B],[ax_compare_version_B]) 105 B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \ 106 -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \ 107 -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \ 108 -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \ 109 -e 's/[[^0-9]]//g'` 110 111 dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary 112 dnl # then the first line is used to determine if the condition is true. 113 dnl # The sed right after the echo is to remove any indented white space. 114 m4_case(m4_tolower($2), 115 [lt],[ 116 ax_compare_version=`echo "x$A 117x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"` 118 ], 119 [gt],[ 120 ax_compare_version=`echo "x$A 121x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"` 122 ], 123 [le],[ 124 ax_compare_version=`echo "x$A 125x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"` 126 ], 127 [ge],[ 128 ax_compare_version=`echo "x$A 129x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"` 130 ],[ 131 dnl Split the operator from the subversion count if present. 132 m4_bmatch(m4_substr($2,2), 133 [0],[ 134 # A count of zero means use the length of the shorter version. 135 # Determine the number of characters in A and B. 136 ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'` 137 ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'` 138 139 # Set A to no more than B's length and B to no more than A's length. 140 A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"` 141 B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"` 142 ], 143 [[0-9]+],[ 144 # A count greater than zero means use only that many subversions 145 A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"` 146 B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"` 147 ], 148 [.+],[ 149 AC_WARNING( 150 [illegal OP numeric parameter: $2]) 151 ],[]) 152 153 # Pad zeros at end of numbers to make same length. 154 ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`" 155 B="$B`echo $A | sed 's/./0/g'`" 156 A="$ax_compare_version_tmp_A" 157 158 # Check for equality or inequality as necessary. 159 m4_case(m4_tolower(m4_substr($2,0,2)), 160 [eq],[ 161 test "x$A" = "x$B" && ax_compare_version=true 162 ], 163 [ne],[ 164 test "x$A" != "x$B" && ax_compare_version=true 165 ],[ 166 AC_WARNING([illegal OP parameter: $2]) 167 ]) 168 ]) 169 170 AS_VAR_POPDEF([A])dnl 171 AS_VAR_POPDEF([B])dnl 172 173 dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE. 174 if test "$ax_compare_version" = "true" ; then 175 m4_ifvaln([$4],[$4],[:])dnl 176 m4_ifvaln([$5],[else $5])dnl 177 fi 178]) dnl AX_COMPARE_VERSION 179