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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - constexpr variable template requires default initialization even though it's not instantiated"
href="http://bugs.llvm.org/show_bug.cgi?id=32115">32115</a>
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<th>Summary</th>
<td>constexpr variable template requires default initialization even though it's not instantiated
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.9
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++14
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>arnetheduck@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>clang rejects the following snippet:
template <typename T>
constexpr int kTag;
with the error:
default initialization of an object of const type 'const int'
even thought it's never instantiated - gcc (6.2) accepts the same code.
I'm not sure if gcc or clang is at fault, per the standard, but seems
reasonable that the error should be delayed until instantiation - that would be
consistent with a constexpr function for example that can remain undefined
unless it's actually used.
Eventually, I'm looking to specialize the tag for different type and letting
the compile catch any untagged types.</pre>
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