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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segmentation fault when working with templates and c++20"
href="https://bugs.llvm.org/show_bug.cgi?id=51872">51872</a>
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<th>Summary</th>
<td>Segmentation fault when working with templates and c++20
</td>
</tr>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>antiro42@gmail.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=25261" name="attach_25261" title="code which reproduces the segfault if compiled with -std=c++20">attachment 25261</a> <a href="attachment.cgi?id=25261&action=edit" title="code which reproduces the segfault if compiled with -std=c++20">[details]</a></span>
code which reproduces the segfault if compiled with -std=c++20
I was integrating a c++20 metaprogramming library in a large codebase when I
started getting segmentation faults from clang whereas gcc was compiling fine.
For legal reasons I am not able to submit the preproccessed source code so I
tried to use creduce (from: <a href="https://embed.cs.utah.edu/creduce/">https://embed.cs.utah.edu/creduce/</a>) to reduce the
reproduction scenario to something I can submit.
Somewhere during the automated reduction process the code got turned into
invalid c++, but the segmentation fault is still there so hopefully the root
cause is still the same.
The reduced source can be found here: <a href="https://godbolt.org/z/qzbcaredj">https://godbolt.org/z/qzbcaredj</a> (also
added as attachment)
The segmentation fault occurs in clang-10 and later (up to and including
trunk). It seems the segfault only occurs when compiling with c++20 enabled
through the use of the -std=c++20 flag.</pre>
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