1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_prog_flex.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_PROG_FLEX(ACTION-IF-TRUE,ACTION-IF-FALSE) 8# 9# DESCRIPTION 10# 11# Check whether flex is the scanner generator. Run ACTION-IF-TRUE if 12# successful, ACTION-IF-FALSE otherwise 13# 14# LICENSE 15# 16# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net> 17# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com> 18# 19# This program is free software; you can redistribute it and/or modify it 20# under the terms of the GNU General Public License as published by the 21# Free Software Foundation; either version 2 of the License, or (at your 22# option) any later version. 23# 24# This program is distributed in the hope that it will be useful, but 25# WITHOUT ANY WARRANTY; without even the implied warranty of 26# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 27# Public License for more details. 28# 29# You should have received a copy of the GNU General Public License along 30# with this program. If not, see <http://www.gnu.org/licenses/>. 31# 32# As a special exception, the respective Autoconf Macro's copyright owner 33# gives unlimited permission to copy, distribute and modify the configure 34# scripts that are the output of Autoconf when processing the Macro. You 35# need not follow the terms of the GNU General Public License when using 36# or distributing such scripts, even though portions of the text of the 37# Macro appear in them. The GNU General Public License (GPL) does govern 38# all other use of the material that constitutes the Autoconf Macro. 39# 40# This special exception to the GPL applies to versions of the Autoconf 41# Macro released by the Autoconf Archive. When you make and distribute a 42# modified version of the Autoconf Macro, you may extend this special 43# exception to the GPL to apply to your modified version as well. 44 45#serial 12 46 47# mattst88: 48# Replaced m4_ifnblank(...) with m4_ifval(m4_normalize(...), ...) 49# since m4_ifnblank requires autoconf-2.64. 50 51AC_DEFUN([AX_PROG_FLEX], [ 52 AC_REQUIRE([AM_PROG_LEX]) 53 AC_REQUIRE([AC_PROG_EGREP]) 54 55 AC_CACHE_CHECK([if flex is the lexer generator],[ax_cv_prog_flex],[ 56 AS_IF([$LEX --version 2>/dev/null | $EGREP -qw '^g?flex'], 57 [ax_cv_prog_flex=yes], [ax_cv_prog_flex=no]) 58 ]) 59 AS_IF([test "$ax_cv_prog_flex" = "yes"], 60 m4_ifval(m4_normalize([$1]), [[$1]]), 61 m4_ifval(m4_normalize([$2]), [[$2]]) 62 ) 63]) 64