<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 --- - Programs compiled with optimization and profiling crash"
href="https://llvm.org/bugs/show_bug.cgi?id=25535">25535</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Programs compiled with optimization and profiling crash
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>Driver
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sisnkemp@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>When using profiling (option -pg) in combination with optimizations (e.g. -O3),
compiled programs crash in the profiling routine mcount().
This is because mcount (on x86_64 at least) relies on the frame pointer to be
valid. When optimizations are enabled, however, the frame pointer is
eliminated.
A test case that demonstrates this and a proposed diff to fix this is given at:
<a href="http://reviews.llvm.org/D14215">http://reviews.llvm.org/D14215</a>
The key is to disable frame-pointer elimination in the driver and the frontend
when the profiling option is provided.</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>