<html>
<head>
<base href="http://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 --- - Possible false positive in undefined-inline with __alloctr_rebind_helper"
href="http://llvm.org/bugs/show_bug.cgi?id=20708">20708</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Possible false positive in undefined-inline with __alloctr_rebind_helper
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>Axel.Naumann@cern.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Hi,
with the attached file.h (excerpt of bits/alloc_traits.h from libstdc++ of GCC
4.9.1) and clang r212179 I get
$ clang -Wall -fsyntax-only -x c++ -std=c++11 file.h
file.h:28:3: warning: inline function '__alloctr_rebind_helper<int,
float>::_S_chk<int, float>' is not defined [-Wundefined-inline]
_S_chk(...);
^
file.h:31:32: note: used here
using __type = decltype(_S_chk<_Alloc, _Tp>(nullptr));
^
1 warning generated.
I don't think decltype should require a definition; I don't see how a
definition could change the decltype. It compiles just fine without the
warning.
As I said this happens in the wild with libstdc++ of GCC 4.9.1 (installed side
by side to the system compiler version) - where we still need to figure out why
clang thinks they are not system headers. But that shouldn't affect this issue.
Thanks!
Axel.</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>