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<base href="https://llvm.org/bugs/" />
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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 --- - False positive error in scan-build: bit logic"
href="https://llvm.org/bugs/show_bug.cgi?id=28187">28187</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>False positive error in scan-build: bit logic
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</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>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>socketpair@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>#define F1 1
#define F2 2
int
main (int argc, char **argv)
{
const char *space;
int flags = argc;
if (flags & (F1 | F2))
space = "qwe";
if (flags & F1)
return *space;
return 0;
}
=========================
$ scan-build-3.8 gcc qwe.c
scan-build: Using '/usr/lib/llvm-3.8/bin/clang' for static analysis
qwe.c:17:12: warning: Dereference of undefined pointer value
return *space;
^~~~~~
1 warning generated.
scan-build: 1 bug found.
=========================
Using constants 0, 1, 2 and 3 instead of `argc` will not trigger that bug.
=========================</pre>
</div>
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