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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Catch assigning to const object in ubsan"
href="https://bugs.llvm.org/show_bug.cgi?id=44296">44296</a>
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<th>Summary</th>
<td>Catch assigning to const object in ubsan
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>9.0
</td>
</tr>
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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>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>anoyes34@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>$ clang++ --version
clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-apple-darwin19.2.0
Thread model: posix
InstalledDir: /usr/local/opt/llvm/bin
$ cat test.cc
int main(int argc, char** argv) {
const int x = 0;
const_cast<int&>(x) = 1;
return x;
}
$ clang++ -fsanitize=undefined test.cc
$ ./a.out
According to <a href="https://en.cppreference.com/w/cpp/language/const_cast">https://en.cppreference.com/w/cpp/language/const_cast</a> this invokes
undefined behavior. I was hoping ubsan would complain, but it did not.</pre>
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