m4/m4.m4

   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])])