m4/ax_prog_flex_version.m4

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