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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [TSan] Automatically define the libstdc++ macros for annotating happens before and after"
href="http://llvm.org/bugs/show_bug.cgi?id=17066">17066</a>
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<th>Summary</th>
<td>[TSan] Automatically define the libstdc++ macros for annotating happens before and after
</td>
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<th>Product</th>
<td>clang
</td>
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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
</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
</td>
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<th>Component</th>
<td>Driver
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>chandlerc@gmail.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Currently, TSan is very hard to use with a generic libstdc++. The reason is
that the _GLIBCXX_SYNCHRONIZATION_HAPPENS_{BEFORE,AFTER} macros are not defined
and thus the annotations in the library are not available to the race detector.
When using '-fsanitize=thread', Clang should directly provide definitions for
these standard library macros that enable appropriate annotations for TSan.
See <a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html#debug.races">http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html#debug.races</a> for
the documentation of these macros.</pre>
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</p>
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