cmd/go: add any .c/.cc files to the SWIG shared library

Also add the action's object directory to the list of
directories we use to find SWIG shared libraries.

Fixes issue 6521.

R=golang-dev, minux.ma
CC=golang-dev
https://codereview.appspot.com/14369043

1 files changed, 15 insertions, 0 deletions

diff --git a/misc/swig/callback/callback.cc b/misc/swig/callback/callback.cc
new file mode 100644
index 000000000..eac24fba0
--- /dev/null
+++ b/misc/swig/callback/callback.cc
@@ -0,0 +1,15 @@
+// Copyright 2013 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.
+
+// This .cc file will be automatically compiled by the go tool and
+// included in the package.
+
+#include <string>
+#include "callback.h"
+
+std::string Caller::call() {
+	if (callback_ != 0)
+		return callback_->run();
+	return "";
+}