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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __thread in template does not compile"
href="https://bugs.llvm.org/show_bug.cgi?id=35237">35237</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>__thread in template does not compile
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>oranevskyy@accesssoftek.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>test.cpp:
template<typename T>
void test()
{
static __thread T my(555);
}
void foo()
{
test<int>();
}
Compilation:
clang++ -c -std=c++11 test.cpp
Output:
test.cpp:4:23: error: initializer for thread-local
variable must be a constant expression
static __thread T my(555);
^~~~~
test.cpp:4:21: note: use 'thread_local' to allow
this
static __thread T my(555);
Gcc compiles this with no error.
As T is a dependent type clang does not "unfold" the ParenListExpr and treats
it as an initializer, i.e.
`-ParenListExpr 0xb40b31c650 <col:23, col:27> 'NULL TYPE'
`-IntegerLiteral 0xb40b31c5f8 <col:24> 'int' 555
Expr::isConstantInitializer() considers such expressions as non-const, hence
the error.</pre>
</div>
</p>
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