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-# ===========================================================================
-# http://www.gnu.org/software/autoconf-archive/ax_prog_bison.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-# AX_PROG_BISON(ACTION-IF-TRUE,ACTION-IF-FALSE)
-#
-# DESCRIPTION
-#
-# Check whether bison is the parser generator. Run ACTION-IF-TRUE if
-# successful, ACTION-IF-FALSE otherwise
-#
-# LICENSE
-#
-# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
-# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the
-# Free Software Foundation; either version 2 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
-
-#serial 9
-
-# mattst88:
-# Modified YACC assignment to remove -o y.tab.c since we're writing
-# our own .y/.yy rules.
-#
-# Replaced m4_ifnblank(...) with m4_ifval(m4_normalize(...), ...)
-# since m4_ifnblank requires autoconf-2.64.
-
-AC_DEFUN([AX_PROG_BISON], [
- AC_REQUIRE([AC_PROG_YACC])
- AC_REQUIRE([AC_PROG_EGREP])
-
- AC_CACHE_CHECK([if bison is the parser generator],[ax_cv_prog_bison],[
- AS_IF([$YACC --version 2>/dev/null | $EGREP -q '^bison '],
- [ax_cv_prog_bison=yes], [ax_cv_prog_bison=no])
- ])
- AS_IF([test "$ax_cv_prog_bison" = "yes"], [
- dnl replace the yacc-compatible compiler with the real bison, as
- dnl otherwise autoconf limits us to the POSIX yacc.
- dnl We also change the generated filename to the old one, so that
- dnl automake's ylwrap can deal with it.
- YACC="${YACC% -y}"
- ] m4_ifval(m4_normalize([$1]), [[$1]]),
- m4_ifval(m4_normalize([$2]), [[$2]])
- )
-])