3 dnl Copyright (C) 2005-2006, 2009-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 dnl Written by Simon Josefsson, with help from Bruno Haible and Oskar
11 AC_DEFUN([gl_FUNC_READLINE],
13 dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
14 AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
15 AC_REQUIRE([AC_LIB_RPATH])
17 dnl Search for libreadline and define LIBREADLINE, LTLIBREADLINE and
18 dnl INCREADLINE accordingly.
19 AC_LIB_LINKFLAGS_BODY([readline])
21 dnl Add $INCREADLINE to CPPFLAGS before performing the following checks,
22 dnl because if the user has installed libreadline and not disabled its use
23 dnl via --without-libreadline-prefix, he wants to use it. The AC_LINK_IFELSE
24 dnl will then succeed.
25 gl_saved_CPPFLAGS="$CPPFLAGS"
26 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCREADLINE])
28 AC_CACHE_CHECK([for readline], [gl_cv_lib_readline], [
31 dnl On some systems, -lreadline doesn't link without an additional
32 dnl -lncurses or -ltermcap.
33 dnl Try -lncurses before -ltermcap, because libtermcap is insecure
34 dnl by design and obsolete since 1994. Try -lcurses last, because
35 dnl libcurses is unusable on some old Unices.
36 for extra_lib in "" ncurses termcap curses; do
37 LIBS="$gl_saved_LIBS $LIBREADLINE"
38 if test -n "$extra_lib"; then
39 LIBS="$LIBS -l$extra_lib"
41 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
42 #include <readline/readline.h>]],
43 [[readline((char*)0);]])],
44 [if test -n "$extra_lib"; then
45 gl_cv_lib_readline="yes, requires -l$extra_lib"
47 gl_cv_lib_readline="yes"
50 if test "$gl_cv_lib_readline" != no; then
57 if test "$gl_cv_lib_readline" != no; then
58 AC_DEFINE([HAVE_READLINE], [1], [Define if you have the readline library.])
59 extra_lib=`echo "$gl_cv_lib_readline" | sed -n -e 's/yes, requires //p'`
60 if test -n "$extra_lib"; then
61 LIBREADLINE="$LIBREADLINE $extra_lib"
62 LTLIBREADLINE="$LTLIBREADLINE $extra_lib"
64 AC_MSG_CHECKING([how to link with libreadline])
65 AC_MSG_RESULT([$LIBREADLINE])
67 dnl If $LIBREADLINE didn't lead to a usable library, we don't
68 dnl need $INCREADLINE either.
69 CPPFLAGS="$gl_saved_CPPFLAGS"
73 AC_SUBST([LIBREADLINE])
74 AC_SUBST([LTLIBREADLINE])
76 AC_CHECK_HEADERS([readline/readline.h readline/history.h])
79 # Prerequisites of lib/readline.c.
80 AC_DEFUN([gl_PREREQ_READLINE], [