From 87e996aaebdae6e2f07c8aa650b4eebdd00f0cba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Bri=C3=A8re?= <fbriere@fbriere.net>
Date: Mon, 12 Feb 2018 19:28:16 -0500
Subject: CMake: Check for res_init() (HAVE_RES_INIT)

This check (AC_CHECK_RES_INIT) was originally defined in acinclude.m4,
and was lost in the transition to CMake.
---
 CMakeLists.txt         | 13 +++++++++++++
 src/sockets/dnssrv.cpp |  1 +
 twinkle_config.h.in    |  1 +
 3 files changed, 15 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 959bd26..ce718da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 include (CheckIncludeFile)
 include (CheckIncludeFiles)
 include (CheckSymbolExists)
+include (CMakePushCheckState)
 include (CheckCXXSourceCompiles)
 
 find_package(LibXml2 REQUIRED)
@@ -137,6 +138,18 @@ if (HAVE_STRERROR_R)
 	" STRERROR_R_CHAR_P)
 endif (HAVE_STRERROR_R)
 
+cmake_push_check_state()
+list(APPEND CMAKE_REQUIRED_LIBRARIES "-lresolv")
+check_cxx_source_compiles("
+	#include <sys/types.h>
+	#include <netinet/in.h>
+	#include <arpa/nameser.h>
+	#include <resolv.h>
+
+	int main() { res_init(); return 0; }
+" HAVE_RES_INIT)
+cmake_pop_check_state()
+
 set(datadir "${CMAKE_INSTALL_PREFIX}/share/twinkle")
 configure_file(twinkle_config.h.in twinkle_config.h)
 configure_file(twinkle.desktop.in twinkle.desktop)
diff --git a/src/sockets/dnssrv.cpp b/src/sockets/dnssrv.cpp
index 38cd61d..246bf02 100644
--- a/src/sockets/dnssrv.cpp
+++ b/src/sockets/dnssrv.cpp
@@ -11,6 +11,7 @@
 #include <sys/time.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
+#include "twinkle_config.h"
 #include <resolv.h>
 #include <errno.h>
 #include <stdlib.h>
diff --git a/twinkle_config.h.in b/twinkle_config.h.in
index b7c678c..9e32712 100644
--- a/twinkle_config.h.in
+++ b/twinkle_config.h.in
@@ -10,6 +10,7 @@
 #cmakedefine HAVE_LINUX_ERRQUEUE_H
 #cmakedefine HAVE_STRERROR_R
 #cmakedefine STRERROR_R_CHAR_P
+#cmakedefine HAVE_RES_INIT
 #cmakedefine HAVE_LIBASOUND
 
 #define VERSION		"${PRODUCT_VERSION}"
-- 
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