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RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-6/porting_to.html,v
retrieving revision 1.7
@@ -220,6 +220,28 @@
the C++ standard library.
</p>
+<h4>Call of overloaded 'abs(unsigned int&)' is ambiguous</h4>
+
+<p>
+The additional overloads can cause the compiler to reject invalid code that
+was accepted before. An example of such code is the below:
+</p>
+
+<pre><code>
+#include <stdlib.h>
+
+int
+foo (unsigned x)
+{
+ abs (x);
+}
+</code></pre>
+
+<p>
+Since calling <code>abs()</code> on an unsigned value doesn't make sense,
+this code will become explicitly invalid as per discussion in the LWG.
+</p>
+
<h3>Optimizations remove null pointer checks for <code>this</code></h3>
<p>
@@ -239,6 +261,15 @@
pointers, not only those involving <code>this</code>.
</p>
+<h3>Deprecation of <code>std::auto_ptr</code></h3>
+
+<p>
+The <code>std::auto_ptr</code> template class was deprecated in C++11, so GCC
+now warns about its usage. This warning can be suppressed with the
+<tt>-Wno-deprecated-declarations</tt> command-line option, though we advise
+to port the code to use C++11's <code>std::unique_ptr</code> instead.
+</p>
+
<h2>-Wmisleading-indentation</h2>
<p>
A new warning <code>-Wmisleading-indentation</code> was added
@@ -303,8 +334,24 @@
the indentation of the source was fixed instead.
</p>
-<h3>Links</h3>
+<h2>Enhanced <code>-Wnonnull</code></h2>
+<p>
+The <code>-Wnonnull</code> warning has been improved so that it also warns
+about comparing parameters declared as nonnull with <code>NULL</code>. For
+example, the compiler will warn about the following code:
+</p>
+<pre><code>
+__attribute__((nonnull)) void
+foo (void *p)
+{
+ if (p == NULL)
+ abort ();
+ // ...
+}
+</code></pre>
+
+<h3>Links</h3>
</body>
</html>