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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - linkage check for friend function"
href="http://llvm.org/bugs/show_bug.cgi?id=15841">15841</a>
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<th>Summary</th>
<td>linkage check for friend function
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>weimingz@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>R171139 checks linkage compatibility. However, the friend function may need to
check lexical parent's linkage declaration.
For example:
extern "C" {
class Foo {
int val;
friend int bar(Foo &);
};
}
extern "C" int bar(Foo &f) {
return f.val;
}
Clang complains
error: declaration of 'bar' has a different language linkage
extern "C" int bar(Foo &f) {
^</pre>
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