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      1 # Copyright 2000 Free Software Foundation, Inc.
      2 #
      3 # This program is free software; you can redistribute it and/or modify
      4 # it under the terms of the GNU General Public License as published by
      5 # the Free Software Foundation; either version 2, or (at your option)
      6 # any later version.
      7 #
      8 # This program is distributed in the hope that it will be useful,
      9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11 # GNU General Public License for more details.
     12 #
     13 # You should have received a copy of the GNU General Public License
     14 # along with this program; if not, write to the Free Software
     15 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
     16 # 02110-1301, USA.
     17 
     18 # BISON_PROG_GNU_M4
     19 # -----------------
     20 # Check for GNU m4, at least 1.3 (supports frozen files).
     21 AC_DEFUN([BISON_PROG_GNU_M4],
     22 [AC_PATH_PROGS(M4, gm4 gnum4 m4, m4)
     23 AC_CACHE_CHECK(whether m4 supports frozen files, ac_cv_prog_gnu_m4,
     24 [ac_cv_prog_gnu_m4=no
     25 if test x"$M4" != x; then
     26   case `$M4 --help < /dev/null 2>&1` in
     27     *reload-state*) ac_cv_prog_gnu_m4=yes ;;
     28   esac
     29 fi])])
     30