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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __builtin_popcount should be constexpr"
href="http://llvm.org/bugs/show_bug.cgi?id=15621">15621</a>
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<th>Summary</th>
<td>__builtin_popcount should be constexpr
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.2
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>steveire@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>switch(argc)
{
case __builtin_popcountll(2):
return 1;
default:
return 0;
}
$ g++ -std=c++11 main.cpp
$ clang++ -std=c++11 main.cpp
main.cpp:228:10: error: case value is not a constant expression
case __builtin_popcountll(2):
^
1 error generated.</pre>
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