m4/m4.m4

   1 # serial 1                                                   -*- Autoconf -*-
   2
   3 # BISON_AC_PROG_GNU_M4
   4 # --------------------
   5 # Check for GNU m4, at least 1.3 (supports frozen files).
   6 AC_DEFUN([BISON_AC_PROG_GNU_M4],
   7 [AC_PATH_PROGS(M4, gm4 gnum4 m4, m4)
   8 AC_CACHE_CHECK([whether m4 supports frozen files],
   9                [ac_cv_prog_gnu_m4],
  10 [ac_cv_prog_gnu_m4=no
  11 if test x"$M4" != x; then
  12   case `$M4 --help < /dev/null 2>&1` in
  13     *reload-state*) ac_cv_prog_gnu_m4=yes ;;
  14   esac
  15 fi])
  16 ])# BISON_AC_PROG_GNU_M4