Build: add Bison version check
[lttng-tools.git] / config / ax_compare_version.m4
1 # ===========================================================================
2 # http://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 11
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 [illegal 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([illegal 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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