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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - false negative for -Wconstant-logical-operand in C++ mode, not in C"
href="https://llvm.org/bugs/show_bug.cgi?id=26852">26852</a>
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<th>Summary</th>
<td>false negative for -Wconstant-logical-operand in C++ mode, not in C
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</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>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>ed0.88.prez@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider this snippet code:
$ cat enum_constant_operand.cpp
int bar();
typedef enum
{
X = 1,
Y = 2,
Z = 4,
} val_t;
int foo()
{
int val = bar();
return (val == X || Y || Z);
}
EOF
If it's compiled in C mode, it reports:
$ clang++ -x c enum_constant_operand.cpp -fsyntax-only
enum_constant_operand.cpp:13:19: warning: use of logical '||' with constant
operand [-Wconstant-logical-operand]
return (val == X || Y || Z);
^ ~
enum_constant_operand.cpp:13:19: note: use '|' for a bitwise operation
return (val == X || Y || Z);
^~
|
enum_constant_operand.cpp:13:24: warning: use of logical '||' with constant
operand [-Wconstant-logical-operand]
return (val == X || Y || Z);
^ ~
enum_constant_operand.cpp:13:24: note: use '|' for a bitwise operation
return (val == X || Y || Z);
^~
|
2 warnings generated.
$
If it's compiled in C++, it won't report anything:
$ clang++ enum_constant_operand.cpp -fsyntax-only
$</pre>
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