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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - C++11 attributes not accepted in template explicit instantiation"
href="https://llvm.org/bugs/show_bug.cgi?id=29094">29094</a>
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<th>Summary</th>
<td>C++11 attributes not accepted in template explicit instantiation
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.8
</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
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++11
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>matthew.woehlke@kitware.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Clang rejects the following code, with the error "an attribute list cannot
appear here":
template <typename T>
T foo(T) { return 0; }
template [[gnu::visibility("default")]]
int foo<int>(int);
Live example:
<a href="https://gcc.godbolt.org/#compilers:!((compiler:clang380,options:'-std%3Dc%2B%2B11',source:'template+%3Ctypename+T%3E%0AT+foo(T)+%7B+return+0%3B+%7D%0A%0Atemplate+%5B%5Bgnu::visibility(%22default%22)%5D%5D%0Aint+foo%3Cint%3E(int)%3B%0A')),filterAsm:(commentOnly:!t,directives:!t,labels:!t),version:3">https://gcc.godbolt.org/#compilers:!((compiler:clang380,options:'-std%3Dc%2B%2B11',source:'template+%3Ctypename+T%3E%0AT+foo(T)+%7B+return+0%3B+%7D%0A%0Atemplate+%5B%5Bgnu::visibility(%22default%22)%5D%5D%0Aint+foo%3Cint%3E(int)%3B%0A')),filterAsm:(commentOnly:!t,directives:!t,labels:!t),version:3</a>
GCC accepts this code. As I read N4606 [A.6] and [A.12], this should be
accepted as:
<explicit-instantiation> -->
[extern] template <declaration> -->
[extern] template <nodeclspec-function-declaration> -->
[extern] template [<attribute-specifier-seq>] <declarator> ;
Moreover, there doesn't seem to be any manner in which Clang accepts an
attribute on an explicit instantiation, which seems surely not intended. Also,
the old style attribute, `__attribute__((visibility("default")))`, is accepted.</pre>
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