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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - GCC ABI incompatibility when passing object with trivial copy ctor, trivial dtor, and non-trivial move ctor"
href="http://llvm.org/bugs/show_bug.cgi?id=19668">19668</a>
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<th>Summary</th>
<td>GCC ABI incompatibility when passing object with trivial copy ctor, trivial dtor, and non-trivial move ctor
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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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>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, richard-llvm@metafoo.co.uk
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider:
$ cat t.cpp
#include <assert.h>
struct A {
A() : x(42) {}
A(A &&o) : x(o.x) {}
// no dtor, no copy ctor
int x;
};
void foo(A a);
#ifdef CONFIG_1
void foo(A a) {
assert(a.x == 42);
}
#else
int main() {
foo(A());
}
#endif
$ clang++ -c -DCONFIG_1 -std=c++0x t.cpp -o t1.o && g++ -c -std=c++0x t.cpp -o
t2.o && g++ t1.o t2.o -o t && ./t
t: t.cpp:11: void foo(A): Assertion `a.x == 42' failed.
Aborted (core dumped)
This looks like it's been present since Clang added support for C++11. I doubt
anyone ever hits it because if you have a non-trivial move ctor, you probably
have a dtor.</pre>
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