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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Warning on vector push_back call of statically allocated object with programmer defined constructor or destructor"
href="http://llvm.org/bugs/show_bug.cgi?id=20138">20138</a>
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<th>Summary</th>
<td>Warning on vector push_back call of statically allocated object with programmer defined constructor or destructor
</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>
</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>
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
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<th>Reporter</th>
<td>linuxham@gmail.com
</td>
</tr>
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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>I'm having a hard time determining if this is a STL bug or a clang false
positive, but the following code example at bottom causes this warning:
$ clang++ --analyze test.cpp
In file included from test.cpp:1:
In file included from
/usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../include/c++/4.8/vector:63:
/usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../include/c++/4.8/bits/stl_uninitialized.h:75:19:
warning: Forming reference to null
pointer
std::_Construct(std::__addressof(*__cur), *__first);
^~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
Code:
#include <vector>
class Foo
{
public:
// ~Foo(){} // uncommenting causes warning
Foo() {} // uncommenting causes warning
};
int main(void)
{
std::vector<Foo> v;
Foo f = Foo();
v.push_back(f);
return 0;
}
If both the programmer-defined constructor and destructor are commented out, no
warning is produced. Filling the constructor and destructor with a simple
allocation and free of memory to an added private member still result in the
same warning.</pre>
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