<html>
<head>
<base href="https://bugs.llvm.org/">
</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 - [7.0 Regression] libc++abi incorrectly aligns exceptions in 32 bit builds"
href="https://bugs.llvm.org/show_bug.cgi?id=39051">39051</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[7.0 Regression] libc++abi incorrectly aligns exceptions in 32 bit builds
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++abi
</td>
</tr>
<tr>
<th>Version</th>
<td>7.0
</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>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eric@efcs.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Libc++ commit r339431 moved the _LIBCPP_HAS_NO_ALIGNED_ALLOCATION logic from
<new> to <__config>. As a result, it was defined when building libc++abi's
fallback_malloc.cpp, which made libc++abi think posix_memalign was unavailable.
This meant that libc++abi was silently falling back to using malloc. In 32 bit
builds, malloc does not return correctly aligned memory for the exception
header.
This is a regression in the 7.0 release.
The issues was fixed in libc++abi commit r342815. This change should be merged
into the 7.1 release.
@Marshall, Louis, can you sign off on this?</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>