From ace4c5eb69ee7dace955acdb23e30e8229b18619 Mon Sep 17 00:00:00 2001
From: Steven Barth <cyrus@openwrt.org>
Date: Wed, 1 Oct 2014 22:40:31 +0200
Subject: [PATCH 1/2] build: allow disabling libreadline-support

This makes nftables a bit more embedded-friendly.

Signed-off-by: Steven Barth <cyrus@openwrt.org>
---
 configure.ac    | 11 +++++++++--
 src/Makefile.in |  2 ++
 src/main.c      |  6 ++++++
 3 files changed, 17 insertions(+), 2 deletions(-)

--- a/configure.ac
+++ b/configure.ac
@@ -71,8 +71,15 @@ AC_CHECK_LIB([nftnl], [nft_rule_alloc],
 AC_CHECK_LIB([gmp], [__gmpz_init], ,
 	     AC_MSG_ERROR([No suitable version of libgmp found]))
 
-AC_CHECK_LIB([readline], [readline], ,
-	     AC_MSG_ERROR([No suitable version of libreadline found]))
+
+AC_ARG_WITH([libreadline], [AS_HELP_STRING([--without-libreadline],
+            [Disable libreadline support (no interactive CLI)])], [],
+            [with_libreadline=yes])
+AS_IF([test "x$with_libreadline" != xno], [
+AC_CHECK_LIB([readline],[readline], , AC_MSG_ERROR([No suitable version of libreadline found]))
+])
+AC_SUBST(with_libreadline)
+
 
 # Checks for header files.
 AC_HEADER_STDC
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -3,7 +3,9 @@ PROGRAMS		+= nft
 nft-destdir		:= @sbindir@
 
 nft-obj			+= main.o
+ifeq (@with_libreadline@,yes)
 nft-obj			+= cli.o
+endif
 nft-obj			+= rule.o
 nft-obj			+= statement.o
 nft-obj			+= datatype.o
--- a/src/main.c
+++ b/src/main.c
@@ -335,8 +335,14 @@ int main(int argc, char * const *argv)
 		if (scanner_read_file(scanner, filename, &internal_location) < 0)
 			goto out;
 	} else if (interactive) {
+#ifdef HAVE_LIBREADLINE
 		cli_init(&state);
 		return 0;
+#else
+		fprintf(stderr, "%s: interactive CLI not supported in this build\n",
+			argv[0]);
+		exit(NFT_EXIT_FAILURE);
+#endif
 	} else {
 		fprintf(stderr, "%s: no command specified\n", argv[0]);
 		exit(NFT_EXIT_FAILURE);
