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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - std::atomic variables are never constant initialized"
href="http://llvm.org/bugs/show_bug.cgi?id=16056">16056</a>
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<th>Summary</th>
<td>std::atomic variables are never constant initialized
</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>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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>st@quanttec.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>static std::atomic<..> variables are not properly constant initialized. If you
look at the assembly generated by clang for the following test case, you'll see
that testVar2 is not constant initialized to -1 as it should be.
#include <atomic>
int testVar1{-1};
std::atomic<int> testVar2{-1};
The following test case seems to suggest that this might be a problem with the
built-in _Atomic types:
struct TestVar {
_Atomic(int) value;
constexpr TestVar(int value) : value(value) {}
};
TestVar testVar{-1};
test.cpp:5:13: error: constexpr constructor never produces a constant
expression [-Winvalid-constexpr]
constexpr TestVar(int value) : value(value) {}
^
test.cpp:5:40: note: non-literal type '_Atomic(int)' cannot be used in a
constant expression
constexpr TestVar(int value) : value(value) {}
^</pre>
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