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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang fails to use constexpr variable template as default value of non-type template argument"
href="https://llvm.org/bugs/show_bug.cgi?id=24903">24903</a>
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<th>Summary</th>
<td>clang fails to use constexpr variable template as default value of non-type template argument
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.7
</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>
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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>fmatthew5876@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>template <typename T>
constexpr int A = 1;
template <typename T, int a = A<T>>
struct B {};
template struct B<int>;
The above code compiles in gcc but fails to compile in clang 3.7 with the
following error:
error : non-type template argument is not a constant expression
Theres also a stack overflow question with this same issue where someone claims
the bug was fixed when in fact it appears that it was not.
<a href="http://stackoverflow.com/questions/30260489/is-it-possible-to-use-a-constexpr-template-variable-as-the-default-for-a-forma/32702600#32702600">http://stackoverflow.com/questions/30260489/is-it-possible-to-use-a-constexpr-template-variable-as-the-default-for-a-forma/32702600#32702600</a></pre>
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