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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __ARM_FEATURE_CRC32 is not defined for armv8.1-a"
href="https://bugs.llvm.org/show_bug.cgi?id=33480">33480</a>
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<th>Summary</th>
<td>__ARM_FEATURE_CRC32 is not defined for armv8.1-a
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>4.0
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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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>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>yyc1992@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
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<pre>crc32c is a required feature on armv8.1-a but when clang is passed
`-march=armv8.1-a`, it does not define the `__ARM_FEATURE_CRC32` which is used
to check if crc32c extension is available.
GCC does define it in this case.
Tested with `{gcc,clang} -march=armv8.1-a -dM - -E < /dev/null | grep -i crc`.
There might be other 8.1/8.2 features that has this issue too.</pre>
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