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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - thread_local member variable accessed without being constructed"
href="http://llvm.org/bugs/show_bug.cgi?id=19288">19288</a>
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<th>Summary</th>
<td>thread_local member variable accessed without being constructed
</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>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++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>arturomdn@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>This bug exists in both clang++ and g++ and was first reported in
stackoverflow:
<a href="http://stackoverflow.com/questions/22722941/thread-local-member-variable-construction">http://stackoverflow.com/questions/22722941/thread-local-member-variable-construction</a>
A simple test case is here
<a href="http://coliru.stacked-crooked.com/a/959f4c60a9f90116">http://coliru.stacked-crooked.com/a/959f4c60a9f90116</a>
#include <iostream>
using namespace std;
struct foo {
int i;
foo(): i{42} {}
};
struct bar {
static thread_local foo FOO;
};
thread_local foo bar::FOO;
int main() {
//cerr << string((bar::FOO.i == 42) ? "Ok" : "Bug") << endl; //Ok
cerr << string((bar().FOO.i == 42) ? "Ok" : "Bug") << endl; //Bug
return 0;
}
Invoked as
clang++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp && ./a.out
Output is
Bug
Expected output is
Ok</pre>
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