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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang accepts template specialization in C linkage"
href="https://bugs.llvm.org/show_bug.cgi?id=46729">46729</a>
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<th>Summary</th>
<td>Clang accepts template specialization in C linkage
</td>
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<th>Product</th>
<td>clang
</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>Linux
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>haoxintu@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Hi, all.
This code, test.cc, I am sure it's an invalid code but Clang compiles it well.
$cat test.cc
template <class> void F(){};
extern "C" {
template < >
void F<int>();
}
While in other compilers I tested:
Output in GCC:
test.cc:3:5: error: template specialization with C linkage
3 | template < >
| ^~~~~~~~
test.cc:2:1: note: 'extern "C"' linkage started here
2 | extern "C" {
| ^~~~~~~~~~
Output in ICC:
test.cc(3): error: this declaration may not have extern "C" linkage
template < >
^
Output in MSVC:
test.cc(3): error C2894: templates cannot be declared to have 'C' linkage
Interestingly, every Clang version from 5.0 onwards behaves the same, only
clang-4.0 rejects this.
Thanks,
Haoxin</pre>
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