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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ThinLTO] Missing vtable COMDAT symbol after r347948"
href="https://bugs.llvm.org/show_bug.cgi?id=40414">40414</a>
</td>
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<th>Summary</th>
<td>[ThinLTO] Missing vtable COMDAT symbol after r347948
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>7.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dmajor@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, peter@pcc.me.uk, tejohnson@google.com
</td>
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<th>Blocks</th>
<td>40331
</td>
</tr></table>
<p>
<div>
<pre>After r350948, a Win64 Firefox ThinLTO build fails with:
LLVM ERROR: Associative COMDAT symbol '??_7KeywordsSink@?A0x23271001@@6B@' does
not exist
(aka const `anonymous namespace'::KeywordsSink::`vftable')
Notably it started failing at r350948 and not r340949. I would have thought the
first patch of that pair was pretty innocuous.
Our flags do not include any of: -f[no]split-lto-unit, -fsanitize=cfi, or
-fwhole-program-vtables.
In case it's a clue, the KeywordsSink class is only used within a single
translation unit: <a href="https://searchfox.org/mozilla-central/search?q=KeywordsSink">https://searchfox.org/mozilla-central/search?q=KeywordsSink</a>
I'm requesting this to be an 8.0.0 blocker as this build config worked for us
in 7.0.1.
I can provide a linkrepro upon request though I'm not sure if that would be
sufficient to investigate this. Let me know if I can help with the debug
somehow. Thanks!</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [meta] 8.0.0 Release Blockers"
href="https://bugs.llvm.org/show_bug.cgi?id=40331">Bug 40331</a>] [meta] 8.0.0 Release Blockers
</li>
</ul>
</div>
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