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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Should immediately reading from a consumed object provoke a warning?"
href="https://llvm.org/bugs/show_bug.cgi?id=31234">31234</a>
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<th>Summary</th>
<td>Should immediately reading from a consumed object provoke a warning?
</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>Linux
</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>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>jacquelinekay1@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following example does not provoke a warning in clang or clang-tidy
(trunk). It also does not produce an error in UBSan.
#include <iostream>
#include <utility>
#include <vector>
int main(int, char**) {
std::string a("hello");
std::vector<std::string> x;
x.emplace_back(std::move(a));
if (a == "hello") {
std::cout << "a retains original value" << std::endl;
}
return 0;
}
I would expect there to be a tool in the Clang/LLVM family to help detect this
kind of bug (side effects which depend on a read from a moved-from object).
However, I am not sure where this error should be detected: should it be a
compiler warning, a static analysis tool diagnostic, or a sanitizer error?</pre>
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