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