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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - UBSan doesn't like std::cout << std::hex"
href="http://llvm.org/bugs/show_bug.cgi?id=18156">18156</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>UBSan doesn't like std::cout << std::hex
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sami.liedes@iki.fi
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>UBSan reports this as UB:
-----
#include <iostream>
int main() {
std::cout << std::hex;
}
-----
When run:
$ clang++ -fsanitize=undefined ubsan_test.cpp -o ubsan_test
$ ./ubsan_test
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/ios_base.h:96:24:
runtime error: load of value 4294967221, which is not a valid value for type
'std::_Ios_Fmtflags'
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/ios_base.h:76:67:
runtime error: load of value 4294967221, which is not a valid value for type
'std::_Ios_Fmtflags'</pre>
</div>
</p>
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