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# readline.m4 serial 10
dnl Copyright (C) 2005-2006, 2009-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl Written by Simon Josefsson, with help from Bruno Haible and Oskar
dnl Liljeblad.
AC_DEFUN([gl_FUNC_READLINE],
[
dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
AC_REQUIRE([AC_LIB_RPATH])
dnl Search for libreadline and define LIBREADLINE, LTLIBREADLINE and
dnl INCREADLINE accordingly.
AC_LIB_LINKFLAGS_BODY([readline])
dnl Add $INCREADLINE to CPPFLAGS before performing the following checks,
dnl because if the user has installed libreadline and not disabled its use
dnl via --without-libreadline-prefix, he wants to use it. The AC_LINK_IFELSE
dnl will then succeed.
am_save_CPPFLAGS="$CPPFLAGS"
AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCREADLINE])
AC_CACHE_CHECK([for readline], [gl_cv_lib_readline], [
gl_cv_lib_readline=no
am_save_LIBS="$LIBS"
dnl On some systems, -lreadline doesn't link without an additional
dnl -lncurses or -ltermcap.
dnl Try -lncurses before -ltermcap, because libtermcap is insecure
dnl by design and obsolete since 1994. Try -lcurses last, because
dnl libcurses is unusable on some old Unices.
for extra_lib in "" ncurses termcap curses; do
LIBS="$am_save_LIBS $LIBREADLINE"
if test -n "$extra_lib"; then
LIBS="$LIBS -l$extra_lib"
fi
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
#include <readline/readline.h>]],
[[readline((char*)0);]])],
[if test -n "$extra_lib"; then
gl_cv_lib_readline="yes, requires -l$extra_lib"
else
gl_cv_lib_readline="yes"
fi
])
if test "$gl_cv_lib_readline" != no; then
break
fi
done
LIBS="$am_save_LIBS"
])
if test "$gl_cv_lib_readline" != no; then
AC_DEFINE([HAVE_READLINE], [1], [Define if you have the readline library.])
extra_lib=`echo "$gl_cv_lib_readline" | sed -n -e 's/yes, requires //p'`
if test -n "$extra_lib"; then
LIBREADLINE="$LIBREADLINE $extra_lib"
LTLIBREADLINE="$LTLIBREADLINE $extra_lib"
fi
AC_MSG_CHECKING([how to link with libreadline])
AC_MSG_RESULT([$LIBREADLINE])
else
dnl If $LIBREADLINE didn't lead to a usable library, we don't
dnl need $INCREADLINE either.
CPPFLAGS="$am_save_CPPFLAGS"
LIBREADLINE=
LTLIBREADLINE=
fi
AC_SUBST([LIBREADLINE])
AC_SUBST([LTLIBREADLINE])
AC_CHECK_HEADERS([readline/readline.h readline/history.h])
])
# Prerequisites of lib/readline.c.
AC_DEFUN([gl_PREREQ_READLINE], [
:
])
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