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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: ac_lib_readline
</title>
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<hr>
<h1>
ac_lib_readline
</h1>
<h2>
Obsolete Macro
</h2>
<p class="indent">
Renamed to VL_LIB_READLINE.
</p>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_LIB_READLINE</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Searches for a readline compatible library. If found, defines
`HAVE_LIBREADLINE'. If the found library has the `add_history' function,
sets also `HAVE_READLINE_HISTORY'. Also checks for the locations of the
necessary include files and sets `HAVE_READLINE_H' or
`HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
'HAVE_HISTORY_H' if the corresponding include files exists.
</p>
<p>
The libraries that may be readline compatible are `libedit', `libeditline'
and `libreadline'. Sometimes we need to link a termcap library for readline
to work, this macro tests these cases too by trying to link with
`libtermcap', `libcurses' or `libncurses' before giving up.
</p>
<p>
Here is an example of how to use the information provided by this macro to
perform the necessary includes or declarations in a C file:
</p>
<pre>
#include <config.h>
#ifdef HAVE_LIBREADLINE
#if defined(HAVE_READLINE_READLINE_H)
#include <readline/readline.h>
#elif defined(HAVE_READLINE_H)
#include <readline.h>
#else /* !defined(HAVE_READLINE_H) */
extern char *readline ();
#endif /* !defined(HAVE_READLINE_H) */
char *cmdline = NULL;
#else /* !defined(HAVE_READLINE_READLINE_H) */
/* no readline */
#endif /* HAVE_LIBREADLINE */
#ifdef HAVE_READLINE_HISTORY
#if defined(HAVE_READLINE_HISTORY_H)
#include <readline/history.h>
#elif defined(HAVE_HISTORY_H)
#include <history.h>
#else /* !defined(HAVE_HISTORY_H) */
extern void add_history ();
extern int write_history ();
extern int read_history ();
#endif /* defined(HAVE_READLINE_HISTORY_H) */
/* no history */
#endif /* HAVE_READLINE_HISTORY */
</pre>
</div>
<h2>
Author
</h2>
<p class="indent">
Ville Laurikari <vl@iki.fi>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-25
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_LIB_READLINE], [
AC_CACHE_CHECK([for a readline compatible library],
ac_cv_lib_readline, [
ORIG_LIBS=$LIBS
for readline_lib in readline edit editline; do
for termcap_lib in "" termcap curses ncurses; do
if test -z "$termcap_lib"; then
TRY_LIB="-l$readline_lib"
else
TRY_LIB="-l$readline_lib -l$termcap_lib"
fi
LIBS="$ORIG_LIBS $TRY_LIB"
AC_TRY_LINK_FUNC(readline, ac_cv_lib_readline="$TRY_LIB")
if test -n "$ac_cv_lib_readline"; then
break
fi
done
if test -n "$ac_cv_lib_readline"; then
break
fi
done
if test -z "$ac_cv_lib_readline"; then
ac_cv_lib_readline="no"
LIBS=$ORIG_LIBS
fi
])
if test "$ac_cv_lib_readline" != "no"; then
AC_DEFINE(HAVE_LIBREADLINE, 1,
[Define if you have a readline compatible library])
AC_CHECK_HEADERS(readline.h readline/readline.h)
AC_CACHE_CHECK([whether readline supports history],
ac_cv_lib_readline_history, [
ac_cv_lib_readline_history="no"
AC_TRY_LINK_FUNC(add_history, ac_cv_lib_readline_history="yes")
])
if test "$ac_cv_lib_readline_history" = "yes"; then
AC_DEFINE(HAVE_READLINE_HISTORY, 1,
[Define if your readline library has \`add_history'])
AC_CHECK_HEADERS(history.h readline/history.h)
fi
fi
])
</pre>
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