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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __sync_bool_compare_and_swap"
href="http://llvm.org/bugs/show_bug.cgi?id=21499">21499</a>
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<th>Summary</th>
<td>__sync_bool_compare_and_swap
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.5
</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
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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>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>keith@bostic.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
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<pre>In clang 3.5, we're seeing __sync_bool_compare_and_swap not working as
documented. If we switch from __sync_bool_compare_and_swap to
__sync_val_compare_and_swap, our tests start passing again.
We don't see the same failure with clang 3.6.
The test is relatively complex (MongoDB test suite running on top of the
WiredTiger storage engine), so it's tough to create a standalone test.
If this is interesting, we'd be happy to run any tests or diagnostics that
would be helpful, the failure reproduces reliably.
<a href="mailto:keith@bostic.com">keith@bostic.com</a></pre>
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