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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No -Wtautological-constant-out-of-range-compare warning"
href="http://llvm.org/bugs/show_bug.cgi?id=18691">18691</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>No -Wtautological-constant-out-of-range-compare warning
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chengniansun@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>This should be a regression. The trunk does not emit
-Wtautological-constant-out-of-range-compare warnings, whereas, the version 3.3
and 3.4 can.
Moreover, if I remove the for statement, then the trunk warns.
$: cat s.c
extern char fn1(char, char);
char func_92() {
long l_105 = 0;
for (;; l_105++)
;
return fn1(0, 0) >= 6000;
}
$: clang-trunk -c -Wtautological-constant-out-of-range-compare s.c
$: clang-3.4 -c -Wtautological-constant-out-of-range-compare s.c
s.c:6:20: warning: comparison of constant 6000 with expression of type 'char'
is always false
[-Wtautological-constant-out-of-range-compare]
return fn1(0, 0) >= 6000;
~~~~~~~~~ ^ ~~~~
1 warning generated.
$: clang-3.3 -c -Wtautological-constant-out-of-range-compare s.c
s.c:6:20: warning: comparison of constant 6000 with expression of type 'char'
is always false
[-Wtautological-constant-out-of-range-compare]
return fn1(0, 0) >= 6000;
~~~~~~~~~ ^ ~~~~
1 warning generated.
$:
$: clang-trunk -v
clang version 3.5 (trunk 200615)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.4.6
Found candidate GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.8.1
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.9.0
Selected GCC installation: /usr/lib64/gcc/x86_64-linux-gnu/4.8</pre>
</div>
</p>
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