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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ext_vector_type as c++11 attribute with clang:: prefix."
href="https://bugs.llvm.org/show_bug.cgi?id=39471">39471</a>
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<th>Summary</th>
<td>ext_vector_type as c++11 attribute with clang:: prefix.
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</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>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>OpenCL
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>llvm@marehr.dialup.fu-berlin.de
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<th>CC</th>
<td>anastasia.stulova@arm.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>I would expect that the following should work
```c++
template <typename value_type, unsigned length>
struct simd
{
// using type = value_type __attribute__((ext_vector_type(length))); works
using type [[clang::ext_vector_type(length)]] = value_type; // does not work
};
using int32x16_t = simd<int, 16>::type;
```
but fails with the following message:
```terminal
warning: unknown attribute 'ext_vector_type' ignored [-Wunknown-attributes]
using type [[clang::ext_vector_type(length)]] = value_type;
^
```</pre>
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