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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -Wc++-compat should warn on implicit conversions from int to enum"
href="https://bugs.llvm.org/show_bug.cgi?id=37679">37679</a>
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<th>Summary</th>
<td>-Wc++-compat should warn on implicit conversions from int to enum
</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>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tobias@grosser.es
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>```
$cat /tmp/test.c
enum ENUM {
ENUM_A,
ENUM_B,
};
enum ENUM foo() {
int x;
enum ENUM e;
e = x; // should warn
x = e; // no warning
return x; // should warn
}
enum ENUM bar() {
return ENUM_A; // no warning
}
```
gcc warns here when using `-Wc++-compat`.
$gcc -Wc++-compat /tmp/test.c -c
/tmp/test.c: In function ‘foo’:
/tmp/test.c:10:4: warning: enum conversion in assignment is invalid in C++
[-Wc++-compat]
e = x; // should warn
^
/tmp/test.c:12:9: warning: enum conversion in return is invalid in C++
[-Wc++-compat]
return x; // should warn
^
clang does not warn, but should.</pre>
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