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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_prog_flex_version.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_FLEX_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE])
#
# DESCRIPTION
#
# Makes sure that flex version is greater or equal to the version
# indicated. If true the shell commands in ACTION-IF-TRUE are executed. If
# not the shell commands in commands in ACTION-IF-TRUE are executed. If
# not the shell commands in ACTION-IF-FALSE are run. Note if $FLEX is not
# set (for example by running AC_CHECK_PROG or AC_PATH_PROG) the macro
# will fail.
#
# Example:
#
# AC_PATH_PROG([FLEX],[flex])
# AX_PROG_FLEX_VERSION([2.5.39],[ ... ],[ ... ])
#
# This will check to make sure that the flex you have is at least version
# 2.5.39 or greater.
#
# NOTE: This macro uses the $FLEX variable to perform the check.
#
# LICENSE
#
# Copyright (c) 2015 Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 2
AC_DEFUN([AX_PROG_FLEX_VERSION],[
AC_REQUIRE([AC_PROG_SED])
AC_REQUIRE([AC_PROG_GREP])
AS_IF([test -n "$FLEX"],[
ax_flex_version="$1"
AC_MSG_CHECKING([for flex version])
changequote(<<,>>)
flex_version=`$FLEX --version 2>&1 \
| $SED -n -e '/flex /b inspect
b
: inspect
s/.* (\{0,1\}\([0-9]*\.[0-9]*\.[0-9]*\))\{0,1\}.*/\1/;p'`
changequote([,])
AC_MSG_RESULT($flex_version)
AC_SUBST([FLEX_VERSION],[$flex_version])
AX_COMPARE_VERSION([$flex_version],[ge],[$ax_flex_version],[
:
$2
],[
:
$3
])
],[
AC_MSG_WARN([could not find flex])
$3
])
])
|
