<html>
<head>
<base href="http://llvm.org/bugs/" />
</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 --- - No conversion warning on bitfields"
href="http://llvm.org/bugs/show_bug.cgi?id=18914">18914</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>No conversion warning on bitfields
</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>
<tr>
<th>OS</th>
<td>Windows NT
</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>chengniansun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>trunk 201801
$: cat s.c
struct S {unsigned x:3;} s;
void f(unsigned sm) {
s.x = sm;// no warning here.
s.x = 9999111;
}
$: clang-trunk -Wconversion s.c -c
s.c:4:7: warning: implicit truncation from 'int' to bitfield changes value from
9999111 to 7
[-Wbitfield-constant-conversion]
s.x = 9999111;
^ ~~~~~~~
1 warning generated.
$: gcc-trunk -Wconversion s.c -c
s.c: In function ‘f’:
s.c:3:9: warning: conversion to ‘unsigned char:3’ from ‘unsigned int’ may alter
its value [-Wconversion]
s.x = sm;// no warning here.
^
s.c:4:9: warning: large integer implicitly truncated to unsigned type
[-Woverflow]
s.x = 9999111;
^
$</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>