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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No warning for comparison of integers of different signs"
href="http://llvm.org/bugs/show_bug.cgi?id=18504">18504</a>
</td>
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<th>Summary</th>
<td>No warning for comparison of integers of different signs
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chengniansun@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>Clang does not emit a warning for the comparison of integers of different
signs.
I have the following program:
////////////////// s.c: program start///////////
int unreported(unsigned a, int *b) {
return a > (~(95 != *b));
}
////////////////// program end///////////
And compile it with the following command, but Clang emits no warning for the
expression "a > (~(95 != *b))"
$clang -Wall -Wextra -std=c11 -pedantic -c s.c
$clang --version
clang version 3.5 (trunk 198918)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Differently, GCC emits a warning with the following command
gcc -Wall -Wextra -std=c11 -pedantic -c s.c
s.c: In function ‘unreported’:
s.c:7:11: warning: comparison between signed and unsigned integer expressions
[-Wsign-compare]
return a > (~(95 != *b));
^</pre>
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