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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang does not mangle __thread variables like MingW (__emutls_v. prefix is missing)"
href="http://llvm.org/bugs/show_bug.cgi?id=20737">20737</a>
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<th>Summary</th>
<td>clang does not mangle __thread variables like MingW (__emutls_v. prefix is missing)
</td>
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<th>Product</th>
<td>new-bugs
</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>Windows NT
</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>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>yaron.keren@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, rnk@google.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>echo __thread unsigned a; > tls.cpp & clang -c -target i686-pc-windows-gnu
tls.cpp & nm tls.o
produces '00000000 D _a'
whereas
echo __thread unsigned a; > tls.cpp & gcc -c tls.cpp & nm tls.o
produces '00000000 D ___emutls_v.a'
this prevent the use of <mutex> in clang-compiled modules since it uses two tls
variables, 'once_call' and 'once_callable' which are mangled to
__emutls_v._ZSt11__once_call
__emutls_v._ZSt15__once_callable
whereas the clang-compiled object refers to
_ZSt11__once_call
_ZSt15__once_callable
is the solution just prefixing '__emutls_v.' to __thread variables?</pre>
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