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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - -Wtautological-compare doesn't warn on comparing default-initialized enums" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23984&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=BXrcFrTCxmnxhnxX2OkRLgYemw7zWS81FfdCe6EzdXY&s=8BRf69m7kQ77AfoWnJUSl6t4YyTRKuYy8TQ1uAmr3M8&e=">23984</a>
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<th>Summary</th>
<td>-Wtautological-compare doesn't warn on comparing default-initialized enums
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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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>nicolasweber@gmx.de
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider this snippet, where someone tried to call GetVersion() but instead
default-initialized an enum:
$ cat test.cc
namespace base {
enum Version { kXP, kVista };
Version GetVersion();
}
void f() {
if (base::Version() == base::kXP)
;
}
I'd expect that comparison to be flagged by -Wtautological-compare, but it
isn't:
$ bin/clang -Weverything test.cc -c
test.cc:6:6: warning: no previous prototype for function 'f'
[-Wmissing-prototypes]
void f() {
^
1 warning generated.</pre>
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