diff -r 000000000000 -r 6474c204b198 js/xpconnect/src/XPCLog.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/xpconnect/src/XPCLog.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,65 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=99: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Debug Logging support. */
+
+#ifndef xpclog_h___
+#define xpclog_h___
+
+#include "prlog.h"
+
+/*
+ * This uses prlog.h See prlog.h for environment settings for output.
+ * The module name used here is 'xpclog'. These environment settings
+ * should work...
+ *
+ * SET NSPR_LOG_MODULES=xpclog:5
+ * SET NSPR_LOG_FILE=logfile.txt
+ *
+ * usage:
+ *   XPC_LOG_ERROR(("my comment number %d", 5))   // note the double parens
+ *
+ */
+
+#ifdef DEBUG
+#define XPC_LOG_INTERNAL(number,_args)  \
+    do{if (XPC_Log_Check(number)){XPC_Log_print _args;}}while (0)
+
+#define XPC_LOG_ALWAYS(_args)   XPC_LOG_INTERNAL(1,_args)
+#define XPC_LOG_ERROR(_args)    XPC_LOG_INTERNAL(2,_args)
+#define XPC_LOG_WARNING(_args)  XPC_LOG_INTERNAL(3,_args)
+#define XPC_LOG_DEBUG(_args)    XPC_LOG_INTERNAL(4,_args)
+#define XPC_LOG_FLUSH()         PR_LogFlush()
+#define XPC_LOG_INDENT()        XPC_Log_Indent()
+#define XPC_LOG_OUTDENT()       XPC_Log_Outdent()
+#define XPC_LOG_CLEAR_INDENT()  XPC_Log_Clear_Indent()
+#define XPC_LOG_FINISH()        XPC_Log_Finish()
+
+extern "C" {
+
+void   XPC_Log_print(const char *fmt, ...);
+bool   XPC_Log_Check(int i);
+void   XPC_Log_Indent();
+void   XPC_Log_Outdent();
+void   XPC_Log_Clear_Indent();
+void   XPC_Log_Finish();
+
+} // extern "C"
+
+#else
+
+#define XPC_LOG_ALWAYS(_args)  ((void)0)
+#define XPC_LOG_ERROR(_args)   ((void)0)
+#define XPC_LOG_WARNING(_args) ((void)0)
+#define XPC_LOG_DEBUG(_args)   ((void)0)
+#define XPC_LOG_FLUSH()        ((void)0)
+#define XPC_LOG_INDENT()       ((void)0)
+#define XPC_LOG_OUTDENT()      ((void)0)
+#define XPC_LOG_CLEAR_INDENT() ((void)0)
+#define XPC_LOG_FINISH()       ((void)0)
+#endif
+
+#endif /* xpclog_h___ */