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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Undef in module included through pch causes assertion failure"
href="http://llvm.org/bugs/show_bug.cgi?id=19215">19215</a>
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<th>Summary</th>
<td>Undef in module included through pch causes assertion failure
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Modules
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>blangmuir@apple.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12264" name="attach_12264" title="reproducer">attachment 12264</a> <a href="attachment.cgi?id=12264&action=edit" title="reproducer">[details]</a></span>
reproducer
When we update the identifier info for a macro that has been undef'd, we set
its UndefLoc to the ImportLoc for the module. However, if the undef is in a
module imported inside a pre-compiled header, that location will be invalid -
causing an assertion failure.
To reproduce:
1. download the attached reproducer and unzip it somewhere
2. run ./repro.sh with a recent clang in your path
I believe that this started in r202560, but I haven't actually bisected it.
As an interesting aside: there is no assertion failure if the macro name is
only one character long (change AB to A in the reproducer).</pre>
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