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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - warning when comparing enum with constant in C"
href="https://llvm.org/bugs/show_bug.cgi?id=27680">27680</a>
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<th>Summary</th>
<td>warning when comparing enum with constant in C
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.8
</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>
<tr>
<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
</td>
</tr>
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<th>Reporter</th>
<td>pgrunt@redhat.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>When compiling C code:
typedef enum {
A=0,
} my_enum;
int f(my_enum x) {
if (x <= 1)
return -1;
return 0;
}
with -Wall a -Wtautological-constant-out-of-range-compare warning is produced.
However changing code to:
typedef enum {
A=1,
} my_enum;
int f(my_enum x) {
if (x <= 1)
return -1;
return 0;
}
No warning is produced. So there seems to be some inconsistency.
Personally I would remove the warning for enum comparison when compiling C code
at all - in C enums and ints can be mixed.</pre>
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</p>
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