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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - #pragma weak "forward declaration" doesn't always work"
href="http://llvm.org/bugs/show_bug.cgi?id=20948">20948</a>
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<th>Summary</th>
<td>#pragma weak "forward declaration" doesn't always work
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.4
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>FreeBSD
</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>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>markj@FreeBSD.org
</td>
</tr>
<tr>
<th>CC</th>
<td>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=13043" name="attach_13043" title="Test case">attachment 13043</a> <a href="attachment.cgi?id=13043&action=edit" title="Test case">[details]</a></span>
Test case
#pragma weak _foo = foo
can be used before foo is declared, provided that foo is defined as non-static.
However, if foo is static, clang emits a warning and no weak symbol is
generated:
$ clang -c -o forward.o forward.c
forward.c:1:14: warning: weak identifier 'foo' never declared
#pragma weak _foo = foo
^
1 warning generated.
gcc 4.7 appears to generate the expected result in both cases.</pre>
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