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Simplify libedit/readline detection somewhat.

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1 parent a5d5ecd commit a1ed465f67678d58f313da70e11d251c49ce1b6d Tollef Fog Heen committed Mar 12, 2013
Showing with 111 additions and 10 deletions.
  1. +4 −10 configure.ac
  2. +107 −0 m4/ax_lib_readline.m4
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@@ -148,16 +148,10 @@ AC_SUBST(PCRE_LIBS)
PKG_CHECK_MODULES([LIBEDIT], [libedit],
[AC_DEFINE([HAVE_LIBEDIT], [1], [Define we have libedit])],
- [AC_CHECK_HEADERS([readline/readline.h])
- AC_CHECK_HEADERS([edit/readline/readline.h])
- AC_CHECK_HEADERS([readline/history.h])
- AC_CHECK_LIB(edit, el_init,
- [ AC_DEFINE([HAVE_LIBEDIT], [1], [Define we have libedit])
- LIBEDIT_CFLAGS=""
- LIBEDIT_LIBS="-ledit ${CURSES_LIBS}"
- ],
- [AC_MSG_ERROR([libedit or readline not found])],
- [${CURSES_LIBS}])])
+ [AX_LIB_READLINE])
+if test "$ac_cv_have_readline" = no; then
+ AC_MSG_ERROR([libedit or readline not found])
+fi
# Checks for header files.
AC_HEADER_STDC
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@@ -0,0 +1,107 @@
+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_lib_readline.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_LIB_READLINE
+#
+# DESCRIPTION
+#
+# 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.
+#
+# 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.
+#
+# 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:
+#
+# #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 */
+#
+# LICENSE
+#
+# Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 6
+
+AU_ALIAS([VL_LIB_READLINE], [AX_LIB_READLINE])
+AC_DEFUN([AX_LIB_READLINE], [
+ AC_CACHE_CHECK([for a readline compatible library],
+ ax_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 $TRY_LIB"
+ AC_TRY_LINK_FUNC(readline, ax_cv_lib_readline="$TRY_LIB")
+ if test -n "$ax_cv_lib_readline"; then
+ break
+ fi
+ done
+ if test -n "$ax_cv_lib_readline"; then
+ break
+ fi
+ done
+ if test -z "$ax_cv_lib_readline"; then
+ ax_cv_lib_readline="no"
+ fi
+ LIBS="$ORIG_LIBS"
+ ])
+
+ if test "$ax_cv_lib_readline" != "no"; then
+ LIBS="$LIBS $ax_cv_lib_readline"
+ AC_DEFINE(HAVE_LIBREADLINE, 1,
+ [Define if you have a readline compatible library])
+ AC_CHECK_HEADERS(readline.h readline/readline.h)
+ AC_CACHE_CHECK([whether readline supports history],
+ ax_cv_lib_readline_history, [
+ ax_cv_lib_readline_history="no"
+ AC_TRY_LINK_FUNC(add_history, ax_cv_lib_readline_history="yes")
+ ])
+ if test "$ax_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
+])dnl

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