From bdd2bac05519d843f94dbea29442b1ce21f904a2 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Wed, 8 Mar 2023 19:26:51 +0100
Subject: [PATCH] configure: fix detection of re-entrant resolver functions

uClibc does not provide res_nsearch:
asterisk-16.0.0/main/dns.c:506: undefined reference to `res_nsearch'

Patch coded by Yann E. MORIN:
http://lists.busybox.net/pipermail/buildroot/2018-October/232630.html

ASTERISK-21795 #close

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Retrieved from:
https: //git.buildroot.net/buildroot/tree/package/asterisk/0005-configure-fix-detection-of-re-entrant-resolver-funct.patch]
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Change-Id: I79296f19e28ec764bbd1e991bf11c416d0b10563
(cherry picked from commit cb0220dec20b988a8d9662dccb215e5a5382b132)
---
 configure    | 6 +++++-
 configure.ac | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 0fd4641007..5079b37bd6 100755
--- a/configure
+++ b/configure
@@ -19348,7 +19348,11 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 int
 main ()
 {
-int foo = res_ninit(NULL);
+
+				int foo;
+				foo = res_ninit(NULL);
+				foo = res_nsearch(NULL, NULL, 0, 0, NULL, 0);
+
   ;
   return 0;
 }
diff --git a/configure.ac b/configure.ac
index 6c8ed5f595..2893248882 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1487,7 +1487,11 @@ AC_LINK_IFELSE(
 			#include <arpa/nameser.h>
 			#endif
 			#include <resolv.h>],
-			[int foo = res_ninit(NULL);])],
+			[
+				int foo;
+				foo = res_ninit(NULL);
+				foo = res_nsearch(NULL, NULL, 0, 0, NULL, 0);
+			])],
 	AC_MSG_RESULT(yes)
 	AC_DEFINE([HAVE_RES_NINIT], 1, [Define to 1 if your system has the re-entrant resolver functions.])
 	AC_SEARCH_LIBS(res_9_ndestroy, resolv)
-- 
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