I suspect we'll be adding some real material there soon.
Applied.
Index: porting_to.html
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+<html>
+
+<head>
+<title>Porting to GCC 6</title>
+</head>
+
+<body>
+<h1>Porting to GCC 6</h1>
+
+<p>
+The GCC 6 release series differs from previous GCC releases in
+<a href="changes.html">a number of ways</a>. Some of
+these are a result of bug fixing, and some old behaviors have been
+intentionally changed in order to support new standards, or relaxed
+in standards-conforming ways to facilitate compilation or run-time
+performance. Some of these changes are not visible to the naked eye
+and will not cause problems when updating from older versions.
+</p>
+
+<p>
+However, some of these changes are visible, and can cause grief to
+users porting to GCC 6. This document is an effort to identify major
+issues and provide clear solutions in a quick and easily searched
+manner. Additions and suggestions for improvement are welcome.
+</p>
+
+
+<h2>Preprocessor issues</h2>
+
+
+<h2>C language issues</h2>
+
+
+<h2>C++ language issues</h2>
+
+
+<h3>Links</h3>
+
+
+</body>
+</html>
Marek
