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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llvm::format() prints incorrect values for %ul"
href="http://llvm.org/bugs/show_bug.cgi?id=20715">20715</a>
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<th>Summary</th>
<td>llvm::format() prints incorrect values for %ul
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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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>Support Libraries
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>jeremysalwen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Example code:
StringRef lol="hi";
dbgs()<< format("%s %lu",lol, 1)<<"\n";
Expected Output:
hi 1
Actual Output:
hi 2
In general the number printed out will be some arbitrary number around the
range of 0-40 rather than the actual value of the argument given.
The bug is not present with format strings %d and %u, but still is present with
%llu. If the %s is not present before the %ul, I wasn't able to reproduce the
bug, but I didn't try very hard.
Luckily in my use case it was obvious that the values printed were wrong, but
this could potentially cause tools using format() to give extremely misleading
output.</pre>
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</p>
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