m4/readline.m4

   1 dnl Check for readline and dependencies
   2 dnl Copyright (C) 2004, 2005 Free Software Foundation, Inc.
   3 dnl
   4 dnl This file is free software, distributed under the terms of the GNU
   5 dnl General Public License.  As a special exception to the GNU General
   6 dnl Public License, this file may be distributed as part of a program
   7 dnl that contains a configuration script generated by Autoconf, under
   8 dnl the same distribution terms as the rest of that program.
   9 dnl
  10 dnl Defines HAVE_LIBREADLINE to 1 if a working readline setup is
  11 dnl found, and sets @LIBREADLINE@ to the necessary libraries.
  12
  13 AC_DEFUN([GNUPG_CHECK_READLINE],
  14 [
  15   AC_ARG_WITH(readline,
  16      AC_HELP_STRING([--with-readline=DIR],
  17         [look for the readline library in DIR]),
  18      [_do_readline=$withval],[_do_readline=yes])
  19
  20   if test "$_do_readline" != "no" ; then
  21      if test -d "$withval" ; then
  22         CPPFLAGS="${CPPFLAGS} -I$withval/include"
  23         LDFLAGS="${LDFLAGS} -L$withval/lib"
  24      fi
  25
  26      for _termcap in "" "-ltermcap" "-lcurses" "-lncurses" ; do
  27         _readline_save_libs=$LIBS
  28         _combo="-lreadline${_termcap:+ $_termcap}"
  29         LIBS="$LIBS $_combo"
  30
  31         AC_MSG_CHECKING([whether readline via \"$_combo\" is present and sane])
  32
  33         AC_LINK_IFELSE(AC_LANG_PROGRAM([
  34 #include <stdio.h>
  35 #include <readline/readline.h>
  36 #include <readline/history.h>
  37 ],[
  38 rl_completion_func_t *completer;
  39 add_history("foobar");
  40 rl_catch_signals=0;
  41 rl_inhibit_completion=0;
  42 rl_attempted_completion_function=NULL;
  43 rl_completion_matches(NULL,NULL);
  44 ]),_found_readline=yes,_found_readline=no)
  45
  46         AC_MSG_RESULT([$_found_readline])
  47
  48         LIBS=$_readline_save_libs
  49
  50         if test $_found_readline = yes ; then
  51            AC_DEFINE(HAVE_LIBREADLINE,1,
  52               [Define to 1 if you have a fully functional readline library.])
  53            AC_SUBST(LIBREADLINE,$_combo)
  54            break
  55         fi
  56      done
  57
  58      unset _termcap
  59      unset _readline_save_libs
  60      unset _combo
  61      unset _found_readline
  62   fi
  63 ])dnl