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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Function types with different language linkages not distinct"
href="http://llvm.org/bugs/show_bug.cgi?id=15563">15563</a>
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<th>Summary</th>
<td>Function types with different language linkages not distinct
</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>All
</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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jed@59a2.org
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Section 7.5.1 of C++98 and C++11 states:
Two function types with different language linkages are
distinct types even if they are otherwise identical.
If the types are distinct, then surely we can overload on that basis:
extern "C" typedef int (*CPtr)(void);
extern "C++" typedef int (*CxxPtr)(void);
int Klutz(CPtr f) { return f(); }
int Klutz(CxxPtr f) { return f(); }
This compiles cleanly with Sun and Cray C++ compilers, but not with Clang, GCC,
Intel, MSVC, IBM XL, PathScale, or PGI.
$ clang++ klutz.cc
klutz.cc:5:5: error: redefinition of 'Klutz'
int Klutz(CxxPtr f) { return f(); }
^
klutz.cc:4:5: note: previous definition is here
int Klutz(CPtr f) { return f(); }
^
1 error generated.</pre>
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