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