From: Dave Hart <hart@ntp.org>
Date: Wed, 30 Mar 2011 04:53:34 +0000 (+0000)
Subject: Follow Ralf Wildenhues' advice for avoiding dead-code elimination
X-Git-Tag: NTP_4_2_7P143~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6043edd670aab4283633a7c29637fdcb17b944cb;p=thirdparty%2Fntp.git

Follow Ralf Wildenhues' advice for avoiding dead-code elimination
  in configure test for in6addr_any.

bk: 4d92b74emekMvZ-rkY3DaBaqdJV6QQ
---

diff --git a/sntp/m4/ntp_ipv6.m4 b/sntp/m4/ntp_ipv6.m4
index b46ff8e7c..8ea9d6783 100644
--- a/sntp/m4/ntp_ipv6.m4
+++ b/sntp/m4/ntp_ipv6.m4
@@ -345,27 +345,31 @@ esac
 
 AC_CACHE_CHECK(
     [for in6addr_any],
-    [isc_cv_have_in6addr_any],
-    [AC_LINK_IFELSE(
-	[AC_LANG_PROGRAM(
-	    [[
-		#include <sys/types.h>
-		#include <sys/socket.h>
-		#include <netinet/in.h>
-		$isc_netinetin6_hack
-		$isc_netinet6in6_hack
-		
-		struct in6_addr * pin6addr_any = &in6addr_any;
-	    ]],
-	    [[
-	    ]]
-	)],
-	[isc_cv_have_in6addr_any=yes],
-	[isc_cv_have_in6addr_any=no]
-    )]
+    [isc_cv_in6addr_any_links],
+    [
+	SAVED_LIBS="$LIBS"
+	LIBS="$LDADD_LIBNTP $LIBS"
+	AC_LINK_IFELSE(
+	    [AC_LANG_PROGRAM(
+		AC_INCLUDES_DEFAULT [[
+		    #include <sys/socket.h>
+		    #include <netinet/in.h>
+		    $isc_netinetin6_hack
+		    $isc_netinet6in6_hack
+		]],
+		[[
+		    printf("%x", in6addr_any.s6_addr[15]);
+		]]
+	    )],
+	    [isc_cv_in6addr_any_links=yes],
+	    [isc_cv_in6addr_any_links=no]
+	)
+	LIBS="$SAVED_LIBS"
+	AS_UNSET([SAVED_LIBS])
+    ]
 )
 
-case "$isc_cv_have_in6addr_any" in
+case "$isc_cv_in6addr_any_links" in
  no)
     AC_DEFINE([ISC_PLATFORM_NEEDIN6ADDRANY], [1], [missing in6addr_any?])
 esac