<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 --- - incompatible bitcode files due to debug info changes"
href="http://llvm.org/bugs/show_bug.cgi?id=17982">17982</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>incompatible bitcode files due to debug info changes
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</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>DebugInfo
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bob.wilson@apple.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Sometime over the last year, and I'm fairly certain it has been since we
released 3.3, the debug info metadata format has changed in incompatible ways.
If you try to use an older bit code file with the current compiler, it is not
uncommon for the compiler to crash. This goes against our goals for keeping
backward compatibility for bit code files and is especially problematic for LTO
since you can't reliably mix objects from different versions of clang.
At a minimum, it seems like we need a version number in the debug info metadata
so we can detect this situation and avoid crashing.
I don't have a test case but we should be able to come up with one if needed.</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>