diplodocus.org Git - nmh/blob - m4/readline.m4

   1 dnl
   2 dnl Our readline heuristic.  If we haven't been asked about readline, then
   3 dnl try to compile with it.  If we've been asked for it, then we fail
   4 dnl if we cannot use it.  If we were explicitly NOT asked for it, then
   5 dnl don't even try to use it.
   6 dnl
   7
   8 AC_DEFUN([NMH_READLINE],
   9 [AC_ARG_WITH([readline],
  10         AS_HELP_STRING([--with-readline],
  11                        [enable readline editing for whatnow (default=maybe)]),
  12         [], [with_readline=maybe])
  13 AS_IF([test x"$with_readline" = xyes -o x"$with_readline" = xmaybe],
  14     [save_LIBS="$LIBS"
  15     LIBS=
  16     AC_SEARCH_LIBS([readline], [readline editline],
  17                    [READLINELIB="$LIBS"
  18                    AC_DEFINE([READLINE_SUPPORT], [1],
  19                              [Support for using readline() in whatnow])],
  20                    [AS_IF([test x"$with_readline" = xyes],
  21                           [AC_MSG_ERROR([Unable to find a readline library])])])
  22     LIBS="$save_LIBS"])
  23 ])
  24
  25 AC_SUBST([READLINELIB])