<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Enumeration with fixed unsigned underlying type erroneously triggers -Wsign-conversion"
href="https://bugs.llvm.org/show_bug.cgi?id=34692">34692</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Enumeration with fixed unsigned underlying type erroneously triggers -Wsign-conversion
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>5.0
</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>hans.ellegard@crunchfish.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Fixing the underlying type of an enumeration to an unsigned char triggers the
"sign-conversion" warning when implicitly converting an instance of the
enumeration to unsigned int.
code snippet (func.cc):
unsigned int func();
unsigned int func() {
enum u8 : unsigned char;
u8 foo{static_cast<u8>(0)};
return foo;
}
Clang output:
clang++ -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -std=c++11 -c
-o func.o func.cc
func.cc:5:10: warning: implicit conversion changes signedness: 'u8' to
'unsigned int' [-Wsign-conversion]
return foo;
~~~~~~ ^~~
1 warning generated.
Here's a Godbolt link for it:
<a href="https://godbolt.org/g/s2wwMo">https://godbolt.org/g/s2wwMo</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>