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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Instantiation depth hit in recursive constexpr function definition"
href="http://llvm.org/bugs/show_bug.cgi?id=20090">20090</a>
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<th>Summary</th>
<td>Instantiation depth hit in recursive constexpr function definition
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>compile-fail
</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>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ldionne.2@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12688" name="attach_12688" title="Exact error message">attachment 12688</a> <a href="attachment.cgi?id=12688&action=edit" title="Exact error message">[details]</a></span>
Exact error message
Hi,
The following code hits the recursive instantiation depth limit on Clang
r211266:
------------------------------------------------------------------------------
template <typename T>
constexpr T fact(T n)
{ return n == 0 ? 1 : [=]{ return n * fact(n-1); }(); }
// template int fact(int);
int main() { fact(1); }
------------------------------------------------------------------------------
If you explicitly instantiate the function template (uncomment the line
above main), the problem goes away. The problem also goes away if fact
is not constexpr.
The exact command line is:
~/code/llvm/build/bin/clang++ -std=c++1y -o /dev/null
~/desktop/bugreport/worksheet.cpp
Regards,
Louis Dionne</pre>
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