m4/ax_prog_flex_version.m4

   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 $FLEX variable to perform the check.
  27 #
  28 # LICENSE
  29 #
  30 #   Copyright (c) 2015 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
  31 #
  32 #   Copying and distribution of this file, with or without modification, are
  33 #   permitted in any medium without royalty provided the copyright notice
  34 #   and this notice are preserved. This file is offered as-is, without any
  35 #   warranty.
  36
  37 #serial 2
  38
  39 AC_DEFUN([AX_PROG_FLEX_VERSION],[
  40     AC_REQUIRE([AC_PROG_SED])
  41     AC_REQUIRE([AC_PROG_GREP])
  42
  43     AS_IF([test -n "$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 /b inspect
  50 b
  51 : inspect
  52 s/.* (\{0,1\}\([0-9]*\.[0-9]*\.[0-9]*\))\{0,1\}.*/\1/;p'`
  53         changequote([,])
  54         AC_MSG_RESULT($flex_version)
  55
  56         AC_SUBST([FLEX_VERSION],[$flex_version])
  57
  58         AX_COMPARE_VERSION([$flex_version],[ge],[$ax_flex_version],[
  59             :
  60             $2
  61         ],[
  62             :
  63             $3
  64         ])
  65     ],[
  66         AC_MSG_WARN([could not find flex])
  67         $3
  68     ])
  69 ])