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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No Warning on logical ‘and’ of mutually exclusive tests"
href="https://llvm.org/bugs/show_bug.cgi?id=22901">22901</a>
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<th>Summary</th>
<td>No Warning on logical ‘and’ of mutually exclusive tests
</td>
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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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>chengniansun@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>The condition "(a > 0 && a < -1)" is always false. Gcc emits a warning, but
Clang currently has not supported this yet.
$: cat t.c
int f(int a) {
return (a > 0 && a < -1) ? 0 : 1;
}
$: clang-trunk -c -Weverything -Wno-missing-prototypes t.c
$: gcc-trunk -c -Wlogical-op t.c
t.c: In function ‘f’:
t.c:2:17: warning: logical ‘and’ of mutually exclusive tests is always false
[-Wlogical-op]
return (a > 0 && a < -1) ? 0 : 1;
^
$:</pre>
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</p>
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