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Index: gcc-6-6.2.1-4.1/src/libgo/go/net/sockoptip_gnu.go
===================================================================
--- /dev/null
+++ gcc-6-6.2.1-4.1/src/libgo/go/net/sockoptip_gnu.go
@@ -0,0 +1,30 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build gnu
+
+package net
+
+import (
+ "os"
+ "syscall"
+)
+
+func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
+ ip, err := interfaceToIPv4Addr(ifi)
+ if err != nil {
+ return os.NewSyscallError("setsockopt", err)
+ }
+ var a [4]byte
+ copy(a[:], ip.To4())
+ if err := fd.incref(); err != nil {
+ return err
+ }
+ defer fd.decref()
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, a))
+}
+
+func setIPv4MulticastLoopback(fd *netFD, v bool) error {
+ return syscall.ENOPROTOOPT
+}
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