<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -Wnonnull should not warn when in an unevaluated context."
href="https://llvm.org/bugs/show_bug.cgi?id=24630">24630</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>-Wnonnull should not warn when in an unevaluated context.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eric@efcs.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Currently when a function annotated with __attribute__((nonnull)) is called in
an unevaluated context with a null pointer a -Wnonnull warning is emitted.
However it is useful to be able to pass null pointers to non-null parameters
within meta-programming. For this reason I don't think the following code
should produce a warning with -Wnonnull.
// clang++ -c -fsyntax-only -Wnonnull test.cpp
int foo(int* __attribute__((nonnull))) { return 42; }
int x = sizeof(foo(0));
Note: g++ does not emit a warning on this code.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>