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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - False positive: "Undefined or garbage value returned to caller""
href="http://llvm.org/bugs/show_bug.cgi?id=18309">18309</a>
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<th>Summary</th>
<td>False positive: "Undefined or garbage value returned to caller"
</td>
</tr>
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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>
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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>john@bass-software.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11774" name="attach_11774" title="Simple test case">attachment 11774</a> <a href="attachment.cgi?id=11774&action=edit" title="Simple test case">[details]</a></span>
Simple test case
Using:
clang version 3.5 (trunk 197863)
Target: x86_64-unknown-linux-gnu
Thread model: posix
I'm getting a false positive "Undefined or garbage value returned to caller"
for a variable which is guaranteed to be written to in one of the 'case'
entries of a 'switch' statement.
Test case attached. Note, that false positive is not given for a switch() on
enum values, but it is given for switch() on an int where two bits are masked
out.
Use: scan-build --use-analyzer <...>/bin/clang gcc -std=c99 -o test.o -c test.c</pre>
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