Check for compiling for IPv6; don't check whether we can create an IPv6 socket.

Don't check whether we can create a TCP-over-IPv6 socket; that appears
to fail in some cases where tcpdump can be built with IPv6 support.
Instead, just check whether AF_INET6 and struct in6_addr are defined.

diff --git a/configure b/configure
index 0e1303b63f1ed0d8ee4746871c18e7106a40b076..f857b8da01577c026212d5decba85ef49bb43562 100755 (executable)
--- a/configure
+++ b/configure
@@ -4833,28 +4833,27 @@ $as_echo "no" >&6; }
        ipv6=no
        ;;
   esac
-else
-  if test "$cross_compiling" = yes; then :
-   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-  ipv6=no
-
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
- /* AF_INET6 available check */
+
+      /* AF_INET6 available check */
 #include <sys/types.h>
 #include <sys/socket.h>
-main()
+#include <netinet/in.h>
+#ifdef AF_INET6
+void
+foo(struct in6_addr *addr)
 {
- if (socket(AF_INET6, SOCK_STREAM, 0) < 0)
-   exit(1);
- else
-   exit(0);
+ memset(addr, 0, sizeof (struct in6_addr));
 }
+#else
+#error "AF_INET6 not defined"
+#endif
+
 
 _ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
+if ac_fn_c_try_compile "$LINENO"; then :
    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
   LOCALSRC="print-ip6.c print-ip6opts.c print-mobility.c print-ripng.c print-icmp6.c print-frag6.c print-rt6.c print-ospf6.c print-dhcp6.c print-babel.c $LOCALSRC"
@@ -4867,10 +4866,7 @@ else
 $as_echo "no" >&6; }
   ipv6=no
 fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 
 

diff --git a/configure.in b/configure.in
index a3f4983a6ae707166f7973aaad66efb09a3ab809..b2443afa411922071b2814abe62236c4c5a49582 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -221,17 +221,24 @@ yes)   AC_MSG_RESULT(yes)
        ;;
   esac ],
 
-  AC_TRY_RUN([ /* AF_INET6 available check */
+  AC_COMPILE_IFELSE(
+    [
+      AC_LANG_SOURCE(
+       [[/* AF_INET6 available check */
 #include <sys/types.h>
 #include <sys/socket.h>
-main()
+#include <netinet/in.h>
+#ifdef AF_INET6
+void
+foo(struct in6_addr *addr)
 {
- if (socket(AF_INET6, SOCK_STREAM, 0) < 0)
-   exit(1);
- else
-   exit(0);
+ memset(addr, 0, sizeof (struct in6_addr));
 }
-],
+#else
+#error "AF_INET6 not defined"
+#endif
+        ]])
+    ],
 [ AC_MSG_RESULT(yes)
   LOCALSRC="print-ip6.c print-ip6opts.c print-mobility.c print-ripng.c print-icmp6.c print-frag6.c print-rt6.c print-ospf6.c print-dhcp6.c print-babel.c $LOCALSRC"
   AC_DEFINE(INET6, 1, [Define if you enable IPv6 support])