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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Broken symbol visibility on explicit template instantiation"
href="http://llvm.org/bugs/show_bug.cgi?id=20521">20521</a>
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<th>Summary</th>
<td>Broken symbol visibility on explicit template instantiation
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mail+llvm@tzik.jp
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12850" name="attach_12850" title="failcase">attachment 12850</a> <a href="attachment.cgi?id=12850&action=edit" title="failcase">[details]</a></span>
failcase
Clang fails to build a binary in attached case with error message below:
<span class="quote">>failcase_main.o:failcase_main.cc:function main: error: undefined reference to 'Failcase<Bar<int> >::~Failcase()'
>failcase_main.o:failcase_main.cc:function Failcase<Bar<int> >::Failcase(): error: undefined reference to 'vtable for Failcase<Bar<int> >'</span >
GCC successfully build the binary, and it emits ~Failcase() to libfailcase.so
as a WEAK DEFAULT symbol, while clang emits it as a LOCAL HIDDEN symbol
according to readelf -sW.
In addition, attached repro case is very fragile.
If I replace an "unsigned int" with "int", reorder the function definition or
removing no-op function call in the failcase.h,
it no longer reproduces the failure, and clang emits WEAK DEFAULT symbol to
libfailcase.so for ~Failcase().</pre>
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