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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - "Dead assignment" false positive - ignores access through reference"
href="http://llvm.org/bugs/show_bug.cgi?id=21018">21018</a>
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<tr>
<th>Summary</th>
<td>"Dead assignment" false positive - ignores access through reference
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bgasowski+llvm@gmail.com
</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>For this code (unused.cpp):
#include <iostream>
int main()
{
int x = 1;
int& ref = x;
std::cout << ref << std::endl;
x = 2;
std::cout << ref << std::endl;
return 0;
}
I get following output from scan-build:
unused.cpp:9:5: warning: Value stored to 'x' is never read
x = 2;
^ ~
1 warning generated.
The value is obviously read, as second cout<<ref prints out 2, as expected.
My "clang++ --version":
Ubuntu clang version 3.5-1ubuntu1 (trunk) (based on LLVM 3.5)
Target: x86_64-pc-linux-gnu
Thread model: posix</pre>
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