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[babeltrace.git] / m4 / ax_prog_flex_version.m4
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1a3ad29b 1# ===========================================================================
540d833d 2# https://www.gnu.org/software/autoconf-archive/ax_prog_flex_version.html
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3# ===========================================================================
4#
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5# SYNOPSIS
6#
7# AX_PROG_FLEX_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE])
8#
9# DESCRIPTION
10#
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11# Makes sure that flex version is greater or equal to the version
12# indicated. If true the shell commands in ACTION-IF-TRUE are executed. If
13# not the shell commands in commands in ACTION-IF-TRUE are executed. If
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14# not the shell commands in ACTION-IF-FALSE are run. Note if $LEX is not
15# set (for example by running AC_PROG_LEX or AC_PATH_PROG) the macro
1a3ad29b 16# will fail.
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17#
18# Example:
19#
540d833d 20# AC_PROG_LEX
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21# AX_PROG_FLEX_VERSION([2.5.39],[ ... ],[ ... ])
22#
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23# This will check to make sure that the flex you have is at least version
24# 2.5.39 or greater.
33bdeb6a 25#
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26# NOTE: This macro uses the $LEX variable to perform the check, if it's
27# empty it will failover to the $FLEX variable for backwards compatibility.
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28#
29# LICENSE
30#
31# Copyright (c) 2015 Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com>
540d833d 32# 2017 Michael Jeanson <mjeanson@efficios.com>
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33#
34# Copying and distribution of this file, with or without modification, are
35# permitted in any medium without royalty provided the copyright notice
36# and this notice are preserved. This file is offered as-is, without any
37# warranty.
38
540d833d 39#serial 3
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40
41AC_DEFUN([AX_PROG_FLEX_VERSION],[
42 AC_REQUIRE([AC_PROG_SED])
43 AC_REQUIRE([AC_PROG_GREP])
44
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45 AS_IF([test -z "$LEX"],[
46 AS_IF([test -n "$FLEX"],[
47 LEX=$FLEX
48 ])
49 ])
50
51 AS_IF([test -n "$LEX"],[
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52 ax_flex_version="$1"
53
54 AC_MSG_CHECKING([for flex version])
55 changequote(<<,>>)
540d833d 56 flex_version=`$LEX --version 2>&1 \
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57 | $SED -n -e '/flex /b inspect
58b
59: inspect
60s/.* (\{0,1\}\([0-9]*\.[0-9]*\.[0-9]*\))\{0,1\}.*/\1/;p'`
61 changequote([,])
62 AC_MSG_RESULT($flex_version)
63
64 AC_SUBST([FLEX_VERSION],[$flex_version])
65
66 AX_COMPARE_VERSION([$flex_version],[ge],[$ax_flex_version],[
67 :
68 $2
69 ],[
70 :
71 $3
72 ])
73 ],[
74 AC_MSG_WARN([could not find flex])
75 $3
76 ])
77])
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