m4/m4.m4

   1 # serial 1
   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, ac_cv_prog_gnu_m4,
   9 [ac_cv_prog_gnu_m4=no
  10 if test x"$M4" != x; then
  11   case `$M4 --help < /dev/null 2>&1` in
  12     *reload-state*) ac_cv_prog_gnu_m4=yes ;;
  13   esac
  14 fi])])