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 3 of the License, or
   6 # (at your option) 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, see <http://www.gnu.org/licenses/>.
  15
  16 # BISON_PROG_GNU_M4
  17 # -----------------
  18 # Check for GNU m4, at least 1.3 (supports frozen files).
  19 AC_DEFUN([BISON_PROG_GNU_M4],
  20 [AC_PATH_PROGS(M4, gm4 gnum4 m4, m4)
  21 AC_CACHE_CHECK(whether m4 supports frozen files, ac_cv_prog_gnu_m4,
  22 [ac_cv_prog_gnu_m4=no
  23 if test x"$M4" != x; then
  24   case `$M4 --help < /dev/null 2>&1` in
  25     *reload-state*) ac_cv_prog_gnu_m4=yes ;;
  26   esac
  27 fi])])