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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __atomic_is_lock_free incompatible with GCC"
href="https://bugs.llvm.org/show_bug.cgi?id=32064">32064</a>
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<th>Summary</th>
<td>__atomic_is_lock_free incompatible with GCC
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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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++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>t.p.northover@gmail.com
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</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>The pre-C11 function, __atomic_is_lock_free takes a second argument that
determines the alignment of the type/value in some way.
GCC appears to do this by looking at the value and libstdc++ passes "(void
*)-alignof(Type)". Clang, however, looks at the alignment of the pointee type
("void" in this case).
This results in a real libcall, which may not actually be available (I think).
Either way, it's not what GCC does.</pre>
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