1 ##### http://autoconf-archive.cryp.to/ax_compare_version.html
5 # AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
9 # This macro compares two version strings. It is used heavily in the
10 # macro _AX_PATH_BDB for library checking. Due to the various number
11 # of minor-version numbers that can exist, and the fact that string
12 # comparisons are not compatible with numeric comparisons, this is
13 # not necessarily trivial to do in a autoconf script. This macro
14 # makes doing these comparisons easy.
16 # The six basic comparisons are available, as well as checking
17 # equality limited to a certain number of minor-version levels.
19 # The operator OP determines what type of comparison to do, and can
22 # eq - equal (test A == B)
23 # ne - not equal (test A != B)
24 # le - less than or equal (test A <= B)
25 # ge - greater than or equal (test A >= B)
26 # lt - less than (test A < B)
27 # gt - greater than (test A > B)
29 # Additionally, the eq and ne operator can have a number after it to
30 # limit the test to that number of minor versions.
32 # eq0 - equal up to the length of the shorter version
33 # ne0 - not equal up to the length of the shorter version
34 # eqN - equal up to N sub-version levels
35 # neN - not equal up to N sub-version levels
37 # When the condition is true, shell commands ACTION-IF-TRUE are run,
38 # otherwise shell commands ACTION-IF-FALSE are run. The environment
39 # variable 'ax_compare_version' is always set to either 'true' or
44 # AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
45 # AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
49 # AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
50 # AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
52 # would both be false.
54 # AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
56 # would be true because it is only comparing two minor versions.
58 # AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
60 # would be true because it is only comparing the lesser number of
61 # minor versions of the two values.
63 # Note: The characters that separate the version numbers do not
64 # matter. An empty string is the same as version 0. OP is evaluated
65 # by autoconf, not configure, so must be a string, not a variable.
67 # The author would like to acknowledge Guido Draheim whose advice
68 # about the m4_case and m4_ifvaln functions make this macro only
69 # include the portions necessary to perform the specific comparison
70 # specified by the OP argument in the final configure script.
78 # Copyright (c) 2004 Tim Toolan <toolan@ele.uri.edu>
80 # This program is free software; you can redistribute it and/or
81 # modify it under the terms of the GNU General Public License as
82 # published by the Free Software Foundation; either version 2 of the
83 # License, or (at your option) any later version.
85 # This program is distributed in the hope that it will be useful, but
86 # WITHOUT ANY WARRANTY; without even the implied warranty of
87 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
88 # General Public License for more details.
90 # You should have received a copy of the GNU General Public License
91 # along with this program; if not, write to the Free Software
92 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
95 # As a special exception, the respective Autoconf Macro's copyright
96 # owner gives unlimited permission to copy, distribute and modify the
97 # configure scripts that are the output of Autoconf when processing
98 # the Macro. You need not follow the terms of the GNU General Public
99 # License when using or distributing such scripts, even though
100 # portions of the text of the Macro appear in them. The GNU General
101 # Public License (GPL) does govern all other use of the material that
102 # constitutes the Autoconf Macro.
104 # This special exception to the GPL applies to versions of the
105 # Autoconf Macro released by the Autoconf Macro Archive. When you
106 # make and distribute a modified version of the Autoconf Macro, you
107 # may extend this special exception to the GPL to apply to your
108 # modified version as well.
110 dnl #########################################################################
111 AC_DEFUN([AX_COMPARE_VERSION], [
112 # Used to indicate true or false condition
113 ax_compare_version=false
115 # Convert the two version strings to be compared into a format that
116 # allows a simple string comparison. The end result is that a version
117 # string of the form 1.12.5-r617 will be converted to the form
118 # 0001001200050617. In other words, each number is zero padded to four
119 # digits, and non digits are removed.
120 AS_VAR_PUSHDEF([A],[ax_compare_version_A])
121 A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
122 -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
123 -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
124 -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
127 AS_VAR_PUSHDEF([B],[ax_compare_version_B])
128 B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
129 -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
130 -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
131 -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
134 dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
135 dnl # then the first line is used to determine if the condition is true.
136 dnl # The sed right after the echo is to remove any indented white space.
137 m4_case(m4_tolower($2),
139 ax_compare_version=`echo "x$A
140 x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
143 ax_compare_version=`echo "x$A
144 x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
147 ax_compare_version=`echo "x$A
148 x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
151 ax_compare_version=`echo "x$A
152 x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
154 dnl Split the operator from the subversion count if present.
155 m4_bmatch(m4_substr($2,2),
157 # A count of zero means use the length of the shorter version.
158 # Determine the number of characters in A and B.
159 ax_compare_version_len_A=`echo "$A" | awk '{print(length)}'`
160 ax_compare_version_len_B=`echo "$B" | awk '{print(length)}'`
162 # Set A to no more than B's length and B to no more than A's length.
163 A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
164 B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
167 # A count greater than zero means use only that many subversions
168 A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
169 B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
173 [illegal OP numeric parameter: $2])
176 # Pad zeros at end of numbers to make same length.
177 ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
178 B="$B`echo $A | sed 's/./0/g'`"
179 A="$ax_compare_version_tmp_A"
181 # Check for equality or inequality as necessary.
182 m4_case(m4_tolower(m4_substr($2,0,2)),
184 test "x$A" = "x$B" && ax_compare_version=true
187 test "x$A" != "x$B" && ax_compare_version=true
189 AC_WARNING([illegal OP parameter: $2])
193 AS_VAR_POPDEF([A])dnl
194 AS_VAR_POPDEF([B])dnl
196 dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
197 if test "$ax_compare_version" = "true" ; then
198 m4_ifvaln([$4],[$4],[:])dnl
199 m4_ifvaln([$5],[else $5])dnl
201 ]) dnl AX_COMPARE_VERSION