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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang++ (v. 7.0.0) segfault at -O2 but not -O1"
href="https://bugs.llvm.org/show_bug.cgi?id=39579">39579</a>
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<th>Summary</th>
<td>clang++ (v. 7.0.0) segfault at -O2 but not -O1
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mb.hansen@chem.au.dk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21098" name="attach_21098" title="clang++ output to stdout">attachment 21098</a> <a href="attachment.cgi?id=21098&action=edit" title="clang++ output to stdout">[details]</a></span>
clang++ output to stdout
Hi, my clang++ installation crashes when compiling a file c++ source file.
```
$ clang++ --version
clang version 7.0.0 (tags/RELEASE_700/final)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /usr/local/opt/llvm/bin
```
It segfaults with the -O2 flag, but not with -O1.
I'll attach the stdout output from clang++ as well as the three files asked in
the diagnostics message.
Attached file will be from running with -O2.</pre>
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