1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_lib_readline.html
3 # ===========================================================================
11 # Searches for a readline compatible library. If found, defines
12 # `HAVE_LIBREADLINE'. If the found library has the `add_history' function,
13 # sets also `HAVE_READLINE_HISTORY'. Also checks for the locations of the
14 # necessary include files and sets `HAVE_READLINE_H' or
15 # `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
16 # 'HAVE_HISTORY_H' if the corresponding include files exists.
18 # The libraries that may be readline compatible are `libedit',
19 # `libeditline' and `libreadline'. Sometimes we need to link a termcap
20 # library for readline to work, this macro tests these cases too by trying
21 # to link with `libtermcap', `libcurses' or `libncurses' before giving up.
23 # Here is an example of how to use the information provided by this macro
24 # to perform the necessary includes or declarations in a C file:
26 # #ifdef HAVE_LIBREADLINE
27 # # if defined(HAVE_READLINE_READLINE_H)
28 # # include <readline/readline.h>
29 # # elif defined(HAVE_READLINE_H)
30 # # include <readline.h>
31 # # else /* !defined(HAVE_READLINE_H) */
32 # extern char *readline ();
33 # # endif /* !defined(HAVE_READLINE_H) */
34 # char *cmdline = NULL;
35 # #else /* !defined(HAVE_READLINE_READLINE_H) */
37 # #endif /* HAVE_LIBREADLINE */
39 # #ifdef HAVE_READLINE_HISTORY
40 # # if defined(HAVE_READLINE_HISTORY_H)
41 # # include <readline/history.h>
42 # # elif defined(HAVE_HISTORY_H)
43 # # include <history.h>
44 # # else /* !defined(HAVE_HISTORY_H) */
45 # extern void add_history ();
46 # extern int write_history ();
47 # extern int read_history ();
48 # # endif /* defined(HAVE_READLINE_HISTORY_H) */
50 # #endif /* HAVE_READLINE_HISTORY */
54 # Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
56 # Copying and distribution of this file, with or without modification, are
57 # permitted in any medium without royalty provided the copyright notice
58 # and this notice are preserved. This file is offered as-is, without any
63 AU_ALIAS([VL_LIB_READLINE], [AX_LIB_READLINE])
64 AC_DEFUN([AX_LIB_READLINE], [
65 AC_CACHE_CHECK([for a readline compatible library],
68 for readline_lib in readline edit editline; do
69 for termcap_lib in "" termcap curses ncurses; do
70 if test -z "$termcap_lib"; then
71 TRY_LIB="-l$readline_lib"
73 TRY_LIB="-l$readline_lib -l$termcap_lib"
75 LIBS="$ORIG_LIBS $TRY_LIB"
76 AC_TRY_LINK_FUNC(readline, ax_cv_lib_readline="$TRY_LIB")
77 if test -n "$ax_cv_lib_readline"; then
81 if test -n "$ax_cv_lib_readline"; then
85 if test -z "$ax_cv_lib_readline"; then
86 ax_cv_lib_readline="no"
91 if test "$ax_cv_lib_readline" != "no"; then
92 LIBS="$LIBS $ax_cv_lib_readline"
93 AC_DEFINE(HAVE_LIBREADLINE, 1,
94 [Define if you have a readline compatible library])
95 AC_CHECK_HEADERS(readline.h readline/readline.h)
96 AC_CACHE_CHECK([whether readline supports history],
97 ax_cv_lib_readline_history, [
98 ax_cv_lib_readline_history="no"
99 AC_TRY_LINK_FUNC(add_history, ax_cv_lib_readline_history="yes")
101 if test "$ax_cv_lib_readline_history" = "yes"; then
102 AC_DEFINE(HAVE_READLINE_HISTORY, 1,
103 [Define if your readline library has \`add_history'])
104 AC_CHECK_HEADERS(history.h readline/history.h)