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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
- ])
- ])
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