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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Gcc and clang differ in treatment of lifetime-extended temporaries."
href="http://llvm.org/bugs/show_bug.cgi?id=17003">17003</a>
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<th>Summary</th>
<td>Gcc and clang differ in treatment of lifetime-extended temporaries.
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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
</td>
</tr>
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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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>labath@google.com
</td>
</tr>
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<th>CC</th>
<td>klimek@google.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>int main() {
struct A {
A() { printf("%p: A() \n", (void*)this); }
~A() { printf("%p: ~A() \n", (void*)this); }
A(const A&) = delete;
};
const A& a = 1 ? (const A &) A() : (const A &) A();
printf("Mark \n");
}
When I run the above code compiled with gcc-4.7, the destructor of A is run
after the printf("Mark") line, which means the lifetime of A was indeed
extended. However, clang (trunk) fails to do that (~A() is printed before
Mark).
I am not sure which interpretation is correct, but I am leaning towards gcc
one.
Also, if I remove the explicit const A& cast then clang complains about copy
constructor being deleted, while gcc still lifetime-extends the object (and
does not perform any copy, hopefully).</pre>
</div>
</p>
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