2 dnl Copyright (C) 2005 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl Written by Simon Josefsson, with help from Bruno Haible and Oskar
10 AC_DEFUN([gl_FUNC_READLINE],
12 AC_LIBSOURCES([readline.c, readline.h])
14 dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
15 AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
16 AC_REQUIRE([AC_LIB_RPATH])
18 dnl Search for libreadline and define LIBREADLINE, LTLIBREADLINE and
19 dnl INCREADLINE accordingly.
20 AC_LIB_LINKFLAGS_BODY([readline])
22 dnl Add $INCREADLINE to CPPFLAGS before performing the following checks,
23 dnl because if the user has installed libreadline and not disabled its use
24 dnl via --without-libreadline-prefix, he wants to use it. The AC_TRY_LINK
25 dnl will then succeed.
26 am_save_CPPFLAGS="$CPPFLAGS"
27 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCREADLINE])
29 AC_CACHE_CHECK(for readline, gl_cv_lib_readline, [
32 dnl On some systems, -lreadline doesn't link without an additional
33 dnl -lncurses or -ltermcap.
34 dnl Try -lncurses before -ltermcap, because libtermcap is unsecure
35 dnl by design and obsolete since 1994. Try -lcurses last, because
36 dnl libcurses is unusable on some old Unices.
37 for extra_lib in "" ncurses termcap curses; do
38 LIBS="$am_save_LIBS $LIBREADLINE"
39 if test -n "$extra_lib"; then
40 LIBS="$LIBS -l$extra_lib"
42 AC_TRY_LINK([#include <stdio.h>
43 #include <readline/readline.h>],
44 [readline((char*)0);],
45 gl_cv_lib_readline=yes)
46 if test "$gl_cv_lib_readline" = yes; then
47 if test -n "$extra_lib"; then
48 LIBREADLINE="$LIBREADLINE -l$extra_lib"
49 LTLIBREADLINE="$LTLIBREADLINE -l$extra_lib"
57 if test "$gl_cv_lib_readline" = yes; then
58 AC_DEFINE(HAVE_READLINE, 1, [Define if you have the readline library.])
61 if test "$gl_cv_lib_readline" = yes; then
62 AC_MSG_CHECKING([how to link with libreadline])
63 AC_MSG_RESULT([$LIBREADLINE])
65 dnl If $LIBREADLINE didn't lead to a usable library, we don't
66 dnl need $INCREADLINE either.
67 CPPFLAGS="$am_save_CPPFLAGS"
72 AC_SUBST(LTLIBREADLINE)
74 AC_CHECK_HEADERS(readline/readline.h)
76 if test $gl_cv_lib_readline = no; then
82 # Prerequisites of lib/readline.c.
83 AC_DEFUN([gl_PREREQ_READLINE], [